CNC Gold Refining Inc.
21 Dundas Square, Suite 205
Toronto, Ontario  M5B 1B7

Toll: 1-877-GOLD497
Tel: (416) 642-3508
Tel: 416 642 3600
Fax: (416) 642-3500

info@goldrefining.ca

 



 

CNC produces popular and commonly used alloys in grain for the jewellery manufacturing industry for the purpose of casting and rolling with special attention given to color, brightness and hardness. These alloy grains are much easier to work with and can be sold in varying quantities.

Also, we are the North American sole representative of Heraeus Ltd. a renowned producer of high quality alloy products for the jewellery manufacturing industry with formulations for all karats ,colors, and tempers. With this partnership we are able to supply sophisticated master alloys for different applications with the highest standards of product quality guaranteed.

Description of Selected Master Alloys

The following alloys are the most popular ones for the American market:

H-177R This alloy is used for 18K yellow gold which is regarded as 3N or standard yellow color. It is suitable for both casting and rolling purpose.
H-179B This alloy is regarded as 2N or greenish yellow for 18K yellow gold. This alloy is suitable for both casting and rolling purpose.
H-139 This alloy is suitable for 8-14K greenish yellow gold casting, This color is frequently used for the US market for the14KY gold.H-136A - This alloy is another green yellow alloy for 8-14K casting. This alloy is less greenish than H-139.
H-889H This alloy is nickel/palladium free alloy for 8-10K white gold casting and rolling. Since the alloy is free of nickel, it can cause no allergic problems to the customers.
H-890 This alloy is another nickel/palladium free alloy for 18KW. This alloy contains a novel whitening metal, manganese which causes rarely allergic problems and its color is white enough for general purpose. However, since manganese is very easy to be oxidized, H-890 is restricted mainly for rolling purpose but not investment casting.
H-147A This alloy is another popular Ni-white gold for 14-18KW casting. This alloy is not as white as H-106A but it is much softer than it.H-6606 . This alloy is very popular if manufacturers asked for softer Ni-white gold. This alloy is regarded as an universal alloy since its application is ranged from 10-I8KW.
H-6649 This alloy is especially good for rolling or machining from 10-18KW. lts hardness is low comparing with the conventional nickel alloys. Many manufacturers use it for chain-knitting.
H-330A This alloy is for making sterling silver. It is regarded as an universal alloy since this alloy can be used for both casting and rolling.
H-430 this alloy is a newly developed master alloy for sterling silver with excellent anti-tarnishing ability. This alloy gives almost no fire-scales problems in manufacturing.
H-550 This alloy is also for sterling silver if a higher hardness of the resultant sterling silver alloy is expected.
H-802 This alloy is used as a pre-alloy for blending with Pd for Pd-white gold. Since this alloy does not contain palladium, the manufacturers can adjust their Pd content according to the customer's specific requirement. This can help saving a lot of time and inventory cost for the palladium.


We carry hundreds of master alloys (10K,14K,18K, and 22K) for different
jewellery karat applications such as casting, stone casting and rolling with full range of colors.

Master alloys for White Gold. (Nickel-Free)
Master alloys for Palladium Containing White Gold
Master alloys for White Gold. (Nickel& Palladium Free)
Master alloys for Colored Gold.
Master alloys for Colored Gold machining)
Sterling Silver and its Master alloys.
Master alloys for Solders. (cadmium Free)
Platinum alloys

Experienced technical staff is available to trouble-shoot any application problem of our clients. Call us for your particular needs. Special pricing is always available for large quantity users. We are sure to have the alloy item available for you in stock, for same day shipping.

 

Descriptions for Selected Master Alloys:
 

Ni-Containing White Alloy



 
H-142

This alloy is termed as a universal alloy for 9-18KW.  Due to its high silicon content, this alloy is only suitable for casting only and not recommended for cold working purpose.  Also, it is more suitable for casting with torches or primitive equipments.  The 22% of nickel in the alloys renders a bit hard for stone setting but its color is regarded as whiter than the average.  This alloy is generally good for 14KW and 18KW.  This alloy can be recommended if the customers asking for better whiteness.  This alloy is excellent for stone casting.  It suffers usually oxidative porosity upon oxidation.

Customers may ask:

What we can offer?

I want a whiter alloy than H-142

H-145, H-147A

I want a softer alloy than H-142

H-102B, H-6606 or H-6649

I want to do machining instead of casting

H-148A or H-6649

 

H-142A

This alloy is a modified version of H-142.  This alloy contains less zinc and silicon which makes this alloy more suitable for the casting with advance casting machines.  The 22% of nickel in the alloys renders a bit hard for stone setting but its color is regarded as whiter than the average.  This alloy is generally good for 14KW and 18KW.  This alloy can be recommended if the customers asking for better whiteness.  This alloy is excellent for stone casting.  It suffers usually oxidative porosity upon oxidation.

Customers may ask:

What we can offer?

I want a whiter alloy than H-142A

H-145B, H-147A

I want a softer alloy than H-142A

H-102B, H-6606 or H-6649

I want to do machining instead of casting

H-148A or H-6649

 

H-145

This alloy is one of the popular KW alloys in far-east market due to its high fluidity and whiteness.  The alloy is excellent for casting.  This alloy is mainly suitable for 18K.  If the customers occasionally produce 14KW item, this alloy is also suitable.  Though this alloy contains 30% of nickel, its 14-18KW resultant alloys are still EN1811 proved.  Since the alloy contains lesser zinc contents, it seldom has oxidative porosity problem.  However, again due to the low content of zinc, this alloy is easy to have hard spot problem which is a very head-ache problem for our customers upon improper use.  H-145 is regarded as an intermediate product between H-142 and H-106B or H-107. 

Customers may ask:

What we can offer?

I want a whiter alloy than H-145

H-106B or H-106A

I want a softer alloy than H-145

H-142, H-102B, H-6606 or H-6649

I want to do a better stone-casting than H-145 but with same color

H-147A

I want the same color but for machining

H-149

 

H-145B

This alloy is a modified version of H-145.  The addition of 15% silver lowers the melting temperature of the resultant alloy rendering a better performance in stone in place casting.  Similar to H-145, it is suitable mainly for 18KW casting but it can also be applied to 14KW.  For other properties, it is closely the same as H-145 except it has a bit lower hardness.  However, upon oxidation and improper handling, this alloy may easily have the hardspot which is difficult to be removed.

Customers may ask:

What we can offer?

I want a whiter alloy than H-145B

H-106B or H-106A

I want a softer alloy than H-145B

H-142, H-102B, H-6606 or H-6649

I want to do a cheaper alloy than H-145B

H-147A

I want to have same color for machining

H-149

 

H-147A

This alloy is a modified version of H-145.  The slightly increase of the zinc content can significantly reduce the hardspot problem upon improper casting.  This alloy is suitable for stone in place casting especially for 18KW.  Due to the higher zinc content, the porosity problem of this alloy is relatively more abundant than in H-145 if there is oxidation.  The alloy gives very white color for 14KW and even no rhodium plating is required.  However, the hardness of 14KW is a bit at high side.

Customers may ask:

What we can offer?

I want a whiter alloy than H-147A

H-106B, H-106A

I want a softer alloy than H-147A

H-142, H-102B, H-6606 or H-6649

I want to do machining instead of casting

H-149

 

H-106A

This alloy gives the whitest color for the 18KW gold.  Besides, this alloy is also suitable for making 21-22KW jewelry.  Due to the high nickel content, the resultant 18KW alloy does not require any rhodium plating.  In general, this alloy gives much better casting performance than the “Precious White” alloy from Cobb.  But due to the nickel content, this alloy is very hard rendering stone-setting is a bit difficult. 

Customers may ask:

What we can offer?

I want a whiter alloy than H-106A

H-106A is the whitest for Ni-white alloy

I want a softer alloy than H-106A

H-106B but the color will be a bit yellow

I want to do machining instead of casting

H-149 is the whitest for machining

Does it pass the EN1811?

Its 18KW can pass according to our test

 

H-106B

This alloy is originally designed for 14-18KW but in practice, it is mainly used for 18KW due to its high hardness of 200HV.  This alloy is very popular among the local Chinese jewelry manufacturers who require brilliant white color for white gold.  It is also regarded as the first white alloy that the Chinese jewelry manufacturers ever encountered.  Due to its high hardness, it is only used for casting.  If customers requested something with lower hardness, H-107 or H-145B can be recommended though it is comparatively not as white as H-106B.  This alloy usually has oxidative porosity or brittle problem if it is casted improperly.

Customers may ask:

What we can offer?

I want a whiter alloy than H-106B

H-106A is whiter

I want a softer alloy than H-106B

H-147A, H-145 or H-145B is an option

I want to do machining instead of casting

H-149 is the whitest for machining

Does it pass the EN1811?

Its 18KW can pass according to our test

 

H-107

This alloy is a modified version of H-106B.  This alloy has lower casting temperature and lower hardness than H-106B.  However, it is still only suitable for casting.  Although the color of this alloy is not as white as H-106B but it is already one of the whitest among our alloys.  This alloy can be used for stone-setting as well.  Compared with H-106B, this alloy has less porosity problem and it is easier to be used.  However, if the customers complained its hardness, the H-145B or H-145 has to be suggested.

Customers may ask:

What we can offer?

I want a whiter alloy than H-107

H-106B or H-106A can be used

I want a cheaper alloy than H-107

H-106B is an option

Does it pass the EN1811?

Its 18KW can pass according to our test

 

H-143C

This alloy used to be the most popular one for making 18KW due to its low hardness.  However, its low Ni content of 17% makes the resultant KW alloy too yellow and easy to have porosity problem.  This alloy is mainly used for casting.  For cold working purpose, it is only conditionally accepted.  The high zinc content also renders oxidative porosity, brittleness and high melt-loss upon improper application. 

Customers may ask:

What we can offer?

I want a whiter alloy than H-143C

H-142

I want a softer alloy than H-142

H-102B, H-6606 or H-6649

I want to do machining instead of casting

H-148A or H-6649

 

H-148A

Ni-containing white alloy is seldom used for cold working purpose due to its relatively high hardness and fire-cracking problem.  H-148A is in fact an exceptional example of the Ni-containing alloy suitable for 14-18KW cold working purpose such as pressing, hollow jewelry and wiring.  Due to the presence of special grain refiner, this alloy gives very dense and shiny surface after cold working.  Also, the appropriate ratio of the nickel and zinc renders this alloy almost free from fire-cracking problem.  However, this alloy is only suitable for cold working purpose only.  If this alloy is applied for casting, the presence of grain refiner may lead to hard-spot problem. 

Customers may ask:

What we can offer?

I want a whiter alloy than H-148A

H-149

I want a softer alloy than H-148A

H-6649

I want to do casting instead of machining

H-142 or H-6606

 

H-149

Usually the Ni-white alloy for cold working purpose bears insufficient whiteness.  This alloy contains 28% of nickel which renders similar whiteness as normal H-145 and H-147A but the hardness is still in an acceptable range of around 170HV.  Also, due to the low silicon content, the ductility is relatively good and it is suitable for both casting and cold-working purpose.  Again due to the low silicon content, the recycling time of this alloy is limited and it may have more porosity upon numerous recycling. 

Customers may ask:

What we can offer?

I want a whiter alloy than H-149 for machining

We have no better choice

I want a softer alloy than H-149

H-148A or H-6649

I want to do stone casting with the similar color as H-149

H-147A

 

H-6610A

Usually, nickel containing alloys have hardness in the range of 150-200HV.  It is very difficult to have the nickel containing alloys with the hardness similar to the green gold.  H-6610A has the hardness of only at 125HV which is even softer than some green gold.  This makes the alloy is extremely good for stone-setting and it is very easy to be used for casting.  With the addition of 5-10% silver, the alloy is excellent for stone casting due to the improved fluidity.  Upon improper use, this alloy may associates with porosity and cracking problem.

Customers may ask:

What we can offer?

I want a whiter alloy than H-6610A

H-102B or H-6606

I want a better alloy for stone casting

5-10% of silver can be added to H-6610A

 

H-6606

This alloy is a universal alloy for casting better than H-142.  The slightly less nickel content of only 20% in this alloy makes the alloy more suitable for stone casting and stone setting.  This alloy contains relatively lower zinc content and therefore the oxidative porosity problem will be less upon recycling.  In order to obtain a better surface in casting, addition of 2-5% of silver in the master alloy is strong suggested.

Customers may ask:

What we can offer?

I want a whiter alloy than H-6606

H-142 or H-147A

I want a softer alloy than H-6606

H-102B or H-6649

I want to do machining with similar color

H-148A or H-6649

 

H-6649

This alloy is a newly developed Ni-containing alloy for cold working and casting purpose.  This alloy contains only 16% of Ni and it is very soft.  It is suitable for producing white gold from 8K – 18K without any difficulty.  This alloy is extremely gold for 8-14K for the sake of softness and ductility.  For 18KW, although this alloy is a bit off-white, it is generally accepted.

Customers may ask:

What we can offer?

I want a whiter alloy than H-6649

H-148A

I want a softer alloy than H-6649

H-6610A

I want to do stone casting with similar color

Addition of 2-5% silver in H-6649

 

H-102B

This alloy is similar to H-143C.  However, H-102B has a fluidity and this alloy contains less zinc. It makes the alloy has less oxidative porosity problem.  Also, there will be less melt loss during the casting.  This alloy also gives denser surface and more shiny surface to the cast.

Customers may ask:

What we can offer?

I want a whiter alloy than H-102B

H-6606, H-142

I want a softer alloy than H-6649

H-6610A

I want to do stone casting with similar color

Addition of 2-5% silver in H-102B

I want to do machining instead of casting

H-6649 or H-148A

 

 

Colored Alloys



 
H-112 or H-112B

This alloy is designed for 8-14KY casting.  It is almost identical to LUX116 from Progold.  Its color is regarded as greenish and it is very suitable for the Turkish market.  A lot of customers prefer this color for making low karat green gold items.  Similar to other low karat alloys, the zinc content of this alloy is quite higher.  It indicates the alloy may be easy to be oxidized especially if it is handled improperly.  H-112 contains more silicon than H-112B.  It indicates that the alloy H-112 has much better recycling time than H-112B but the new alloy may be easier to have cracking problem due to the surplus silicon in the alloys.

Customers may ask:

What we can offer?

I want an alloy with better recycling time

H-112

I want an alloy with better ductility

H-112B

 

H-111 or H-111R
This alloy is suitable for 8-14K deep yellow casting.  This alloy contain only 11% of silver and its color is in general accepted.  Due to its low silver content, the alloy is especially good if the customer wants to reduce the production cost from master alloys.  The H-111R is the rolling version of H-111.  This alloy is suitable for both casting and machining. 
 

Customers may ask:

What we can offer?

I want a cheaper alloy with H-111

H-112 or H-112B

I want a more greenish alloy than H-111

H-112B gives more greenish color

 

H-126, H-126A, H-126R

H-126 is suitable for 8-14KY casting.  The color of this alloy is regarded as pinkish yellow which is one of the popular colors for EU market.  Comparing with other alloys for low karat gold, this alloy contains relatively less zinc indicating it has less oxidative porosity problem.  To cope with different production method, this alloy has some derivatives such as H-126A which contains less silicon rendering it suitable for casting with better facilities.  The silicon free version, H-126R is developed for cold working purpose.

Customers may ask:

What we can offer?

I want a more greenish alloy than H-126

H-111 or H-112B

Can the alloy be suitable for machining?

H-126R is the rolling version

 

H-136A, H-136B, H-136D

H-136A is suitable for 8-14KY casting.  It bears a greenish yellow color which is very popular for the US market.  Similar to other normal low karat alloys, its relatively high zinc content renders a higher chance of getting oxidative porosity upon improper use To cope with the different production method, derivatives such as H-136B and H-136D are developed.  H-136D has the same color but it is developed for the cold-working purpose.

Customers may ask:

What we can offer?

I want a more greenish alloy than H-136A

H-139 is suggested

The alloy may crack easily after casting

Quenching faster or use the version with less silicon

 

H-139 or H-139R

H-139 is suitable for 8-14KY casting.  This alloy gives a slightly more rich greenish yellow color than H-136A.  It is also very popular for the US market.  However, due to its slightly higher silver content  than H-136A, it is more expensive than H-136A.  This alloy is almost identical to M5123I from Advance.

Customers may ask:

What we can offer?

I want a less greenish alloy than H-139

H-136A

Can the alloy be suitable for machining?

H-139R is the rolling version

 

H-210

H-210 is suitable for 8-14KY casting.  It has a pale yellow color which is one of the popular colors for the EU market.  Together with H-126 and H-136A, these three items can be regarded as the most frequently requested alloys.  This alloy is very easily to handle.  Compare with H-136A, it has less porosity problem.  The cold-working version of H-210 will be developed upon requested by customers.

Customers may ask:

What we can offer?

I want an alloy with deeper color

H-111 can be offered

Can I use it for machining?

There is rolling version for H210

 

H-160A, H-160C & H-160D

H-160C is suitable for 8-14KY casting.  Its deep yellow color is especially popular for the Indian market.  It is equivalent to the well-known alloy, UA1 in India.  Some Indian customers also used it for 18KY although it is not recommended here.  The alloy contains less than 10% of zinc indicating the ductility of this alloy is very good.  Besides, the oxidative porosity is less due to the presence of zinc.  Similar to other yellow alloy, it also has derivatives with different amount of silicon.  H-160D has the same color as H-160C but it is designed for cold-working purpose.

Customers may ask:

What we can offer?

I want a cheaper alloy than H-160A

H-111 is suggested

The alloy has problems upon recycling

Alloy with higher Si-content is suggested such as H-160A

 

H-188A, H-188B, H-188C, H-188D

H-188B is suitable for 14-18KY casting and some customers even extend its application to 10KY.  The color of this alloy is regarded as Hamilton yellow, which is very popular in US market.  Similar to the alloys mentioned above, this alloy also has different derivatives containing different amount of silicon.  The silicon free version, H-188D is specially designed for cold working purpose.  However, due to the presence of high percentage of zinc, the alloy may have oxidative porosity upon improper use.  Also, the ductility of the resultant alloy is worse and it may have cracking problem during casting.  Also, due to its high silver content, the selling price of this alloy is relatively higher.

Customers may ask:

What we can offer?

I want a cheaper alloy than H-188B

H-139 is suggested

The alloy may crack easily after casting

Quenching faster or use the version with less silicon

H-188B is suitable for 14-18KY casting and some customers even extend its application to 10KY.  The color of this alloy is regarded as Hamilton yellow, which is very popular in US market.  Similar to the alloys mentioned above, this alloy also has different derivatives containing different amount of silicon.  The silicon free version, H-188D is specially designed for cold working purpose.  However, due to the presence of high percentage of zinc, the alloy may have oxidative porosity upon improper use.  Also, the ductility of the resultant alloy is worse and it may have cracking problem during casting.  Also, due to its high silver content, the selling price of this alloy is relatively higher.

Customers may ask:

What we can offer?

I want a cheaper alloy than H-188B

H-139 is suggested

The alloy may crack easily after casting

Quenching faster or use the version with less silicon

 

H-153R

This alloy is an improved version and our intensive trials showed that this alloy is less sensitive towards the intermetallic s formation.  This indicates that the alloy is not easy to become brittle.  This alloy is suitable for 10-18KR casting and it gives the typical red color (5N).  This alloy is also good for continuous casting.  But of course, the ingot from continuous casting must be cooled effectively and rapidly after casting. 

Customers may ask:

What we can offer?

I want an alloy with deeper color

H-154A gives deeper color but more brittle

The alloy may crack easily after casting

Quenching faster or use the version with more silver

 

H-154A

This alloy gives the deepest red color for 18KR.  It is also suitable for 10-14KR casting.  However, due to its high copper content, the alloy is easy to crack if the casting is not handled properly.  If the customers always have cracking problem with this alloy in 18KR casting, they are suggested to quench faster or they have to consider an alloy with lighter color.

Customers may ask:

What we can offer?

The alloy crack easily upon casting or soldering

H-153R is suggested due to the lower Cu-content

I want a darker color

H-154A is the darker or only copper is used

 

H-128 & H-128R

This alloy contains 15% of silver. This makes the alloy is easy to cast and easy to do machining.  The color of this alloy is sometimes referred as “Russian Red”.  The alloy is not very sensitive towards intermetallics formation resulting its ductile nature.  This alloy can be used for cold-working purpose without too much problems.  However, due to the higher silver content, its color is bit paler.

Customers may ask:

What we can offer?

I want to have a deeper color

H-153R is suggested due to the lower Ag-content

The alloy still cracks easily

H-152 has to be suggested or quenching is not properly done

 

H-152

This alloy is also for 10-18KR casting.  Due to its relatively high silver content, it gives only a pink color.  But at the same time, this alloy is the most user-friendly.  It can be used as normal yellow gold except still a bit difficulty in stone casting.  If the customers do not care too much about the color or they want some pink gold which is easy to handle, H-152 should be their choice.

Customers may ask:

What we can offer?

I want to have a deeper color

H-128 or H-153R is suggested due to the lower Ag-content

The alloy turns greenish after quenching

The flask temperature is too high and too much copper oxidized.

 

H-177A, H-177B, H-177C, H-177R

H-177A is suitable for 18KY casting.  Its yellow color is regarded as standard yellow or equivalent to 3N color.  It gives the most popular color among all the yellow gold no matter for EU or US market.  According to different production, we also developed a series of derivatives such as H-177B and H-177C, which contains less amount of silicon.  Since this alloy has higher percentage of silver indicating it is more sensitive towards the presence of silicon which is not soluble in silver.  Therefore, the customers should be advised to consider changing to the one with less silicon once they experience cracking problem.  Due to the low content of zinc, the alloy seldom has oxidative porosity problems.  For cold-working purpose, the customers can use H-177R. 

Customers may ask:

What we can offer?

I want to have a more greenish color

H-179B with 2N color is suggested

I want a deeper yellow color

H-176A is suggested

The alloy cracks easily

The version with less silicon is suggested

 

H-179B

H-179B is suitable for both 18KY casting and cold working purpose.  The color of this alloy is regarded as greenish yellow or equivalent to 2N color.  Sometimes this color is also termed as Italian yellow.  It is popular for EU market and Japanese market.  Since the alloy contains high content of silver, silicon is not added for deoxidizing purpose except one of its derivatives, H-179F.  But usually, this alloy seldom has cracking problem unless improper handling.  H-179B used to be very popular among the market.  However, due to its silver content and the change of the fashion trend, it is no longer as popular as in the past.  Anyway, if the customers asked the alloy with less greenish tint,

H-177A can be suggested.  In contrast, if they asked for something with even more greenish color, H-186 can be suggested.

Customers may ask:

What we can offer?

I want to have a more greenish color

H-186 with 1N color is suggested

I want a deeper yellow color

H-176A or H-177 series are suggested

 

H-186

This alloy is suitable for 10-18KY casting and cold-working purpose.  Its color is regarded as green yellow or champagne yellow.  It is very green comparing with other typical yellow color.  However, due to its high silver content, the operating temperature is relatively higher rendering high risks of getting gas porosity and rough surface problem.  In contrast, this alloy seldom has oxidative porosity problem due to its low zinc content.

Customers may ask:

What we can offer?

I want to have a more greenish color

It is the most greenish alloy we have

I want a deeper yellow color

H-179B or H-177 series are suggested

It cracks easily

The alloy can be quenched faster

 

H-172 or H-172C

H-172C is suitable for 14-18KY casting and cold working purpose.  The color of this alloy is regarded as reddish yellow, which is very popular among the Asian market.  The local customers in China prefer H-172C more than H-177A since H-177A is too greenish for them.  In general, this alloy has no obvious application problem but cracking problem is occasionally found when we applied this alloy for stone casting.  The cracking is attributed to the relatively high zinc content for 18KY.  In fact, no matter what the alloy is, 18KY alloy should not contain too much zinc metal.

Customers may ask:

What we can offer?

I want to have a more greenish color

H-177 or H-179B   are suggested

I want a deeper yellow color

H-155R is suggested

 

H-180B

This alloy is suitable for 18-22KY casting and cold working purpose.  The color of the resultant 22KY alloy is regarded as deep yellow or rich yellow.  This color is very popular for the Middle East market.  The hardness of this alloy is only of around 90HV.  It is a normal hardness for 22KY though the customers usually ask the alloy with higher hardness.  Due to the high content of gold, the customers usually have no application for 22KY items at all no matter they use only raw silver and copper.  Since the market of this alloy is limited, if the customers ask alloy with different color, we do have different recipes but we may not consider to produce unless they request in larger quantity.

Customers may ask:

What we can offer?

I want to have a more greenish color

H-225 is suggested

I want a harder 22K alloy

There is no such alloy.

 

 

Sterling Silver



 
O-AAG & H-PAT
H-PAT (named as H-925 in Thailand) is a brass-based master alloy we develop for making sterling silver, which is called O-AAG.  H-PAT can make the resultant sterling silver more tarnish-resistant.  Besides, the alloy is more oxidation resistant during production resulting less porosity and red stain problem in comparison with only copper.  Since the alloy contains no silicon, there is no grain-coarsening effect rendering a better and finer surface after casting.  In addition, the resultant sterling silver is also good for cold working purpose.  But because of the same reason, H-PAT is not so suitable for the methods with high risks of getting oxidation such as torch melting or heavy soldering process.  H-PAT is only suitable for those with well-protected casting machine.  The common defect upon oxidation is usually red-stain problem.  If the customers experience oxidation problem with this alloy, alloys contains different amounts of silicon should be suggested.
 

Customers may ask:

What we can offer?

I want an alloy with less red stain

H-430 or H-449 is suggested

I want an alloy with better oxidation resistance

H-330 or H-330A is suggested.

 

H-330, H-330A & O-DAG Series

H-330 is another brass-based master alloy for making sterling silver and its resultant sterling silver alloys are called O-DAG.  Similar to H-PAT, it has substantial anti-tarnishing ability and oxidation resistance.  Due to the presence of silicon, it gives even better deoxidizing ability to the alloy.  Unlike H-PAT, it can also be used for torch melting or casting with relatively primitive facilities.  This reveals that this alloy is suitable for most Chinese customers who have usually only primitive equipment.  The resultant alloy is suitable for both casting and cold-working purpose.  Upon oxidation, the alloy usually has oxidation porosity problem and some red-stain problem if it is heavily oxidized.  In general, the number of recycling of this alloy is better than H-PAT.  In some cases, if the customers have cracking problem with this alloy, you should consider whether there is too much silicon for their application since excessive silicon in the silver alloy can cause severe cracking problem.  If this is the case, you should use the alloy with less silicon or even silicon free.  Moreover, the presence of silicon may cause also hard spot problem upon oxidation.

Customers may ask:

What we can offer?

I want an alloy with less red stain

H-430 or H-449 is suggested

I want an alloy with better oxidation resistance

H-430or H-449 is suggested.

 

H-550 & O-SAG

H-550 is a copper based master alloy for making sterling silver and the resultant alloy is called O-SAG.  Despite its high copper content, it contains also a high percentageof silicon, which gives a very good anti-oxidation ability to the resultant sterling silver.  Besides, the presence of silicon can harden the alloy.  The measured hardness of this alloy can be up to 70HV, which is significantly higher than those of O-DAG and O-AAG.  The silicon can also enhance the anti-tarnishing ability of the sterling silver.  Unless severe oxidation, the alloy seldom has oxidative porosity problem but may associate with some red-stains.  But due to the high content of silicon, upon oxidation, the alloy may have sometimes hard spot problem which caused difficulty in polishing.  Since silicon is not soluble in silver, too much silicon in the alloy can cause cracking problem resulting from the segregation of the silicon from the alloy especially upon slow cooling.  If the customers do not satisfy with the red-stain problem in this alloy, O-DAG should be suggested.

Customers may ask:

What we can offer?

I want an alloy with less red stain

H-430 or H-449 is suggested

I want an alloy with better oxidation resistance

H-330 or H-330A is suggested.

 

H-449 & O-ZAG

H-449 is another master alloy with high zinc content for making sterling silver and its resultant sterling silver is called O-ZAG.  Similar to other sterling silvers, it bears also substantial anti-tarnishing ability.  Owing to its high content of zinc, it seldom has red-stain problem and it can even be regarded as red-stain free alloy.  Also, this alloy is suitable for torch melting.  Though the presence of zinc gives the above advantages, it at the same time gives some drawbacks too.  O-ZAG has relatively lower hardness of only 53 HV but it only causes problem when we cast filigree items.  Upon oxidation, the alloy may have oxidative porosity problem or even cracking problem due to the accumulation of zinc oxides.  If the customers found difficulties in handling this alloy, they should consider to change the alloy to H-430 and also they have to consider up-grading the casting facilities and/or review the casting procedure that they currently use.

Customers may ask:

What we can offer?

I want an alloy with better hardness

H-330 or H-PAT I suggested

I want an alloy with less porosity problem

H-430 is suggested

 

H-336 & O-BAG

H-336 is a brass-based alloy containing a new type of deoxidizer, germanium.  Its resultant alloy is called O-BAG.  Germanium has similar properties as silicon.  It can also be used as deoxidizer.  But germanium has better solubility in silver indicating the alloy can tolerate a higher percentage of deoxidizer in the alloy without segregation.  O-BAG gives better surface finishing than other alloys and it is relatively more oxidation resistant.  Besides, the germanium can form a very good cover to protect the silver against tarnishing.  So, it overall gives a very good performance in casting.  However, the germanium metal is very expensive rendering the material cost of the alloy much higher than the others.  Since H-336 is a brass-based alloy, it still has the same problem such as oxidation porosity and minor red-stain problem upon oxidation.  Since the price of this alloy is just expensive (as expensive as silver).  It is difficult to convince the customers to apply this alloy for mass production unless they request some sterling silver for high-ended products.  So, if they cannot accept this alloy, the alternative alloy such as H-330A should be suggested.
 

Customers may ask:

What we can offer?

I want an alloy with less red stain

H-430 or H-449 is suggested

I want a cheaper alloy than H-336

H-330 or H-330A is suggested.

 

H-430

H-430 is a newly developed master alloy with high zinc content for making sterling silver.  Similar to other sterling silver from Heraeus, it bears excellent anti-tarnishing ability.  Owing to its high content of zinc, it rarely has red-stain problem and it can even be regarded as red-stain free alloy.  Also, this alloy is suitable for torch melting.  Though the presence of zinc gives the above advantages, it at the same time gives some drawbacks too.  Upon oxidation, the alloy may have oxidative porosity problem or even cracking problem due to the accumulation of zinc oxides.  If the customers found difficulties in handling this alloy especially because to the hardness, they should consider to change the alloy to H-632 or H-550.

Customers may ask:

What we can offer?

I want an alloy with better hardness

H-330 or H-330A is suggested.

I want an alloy with less porosity problem

H-PAT should be suggested.


 

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