Argentium® silver casting grains give you the versatility you expect! Argentium® casting grains are produced in four distinct alloys, each to provide you with casting luxurious jewelry and silverware products.
G&S Metals and Refiners stocks Argentium® Professional Casting Grain, Argentium® 960 Pro and Argentium® 935 Pro.
Argentium® Casting Grain
Argentium® Professional Casting Grain
Argentium® Pro casting alloys have been developed for superior volume investment casting applications:
Argentium® Classic Casting Grain
Argentium® Classic casting grains have properties ideal for manufacturing milled products:
- Argentium® Original
- Argentium® 960-Pure
Argentium® Silver offers a brighter and whiter color than traditional sterling silver, platinum and even white gold. The purer Argentium® color has been tested using the CIELAB standard color measurement system, with a device called the Colorimeter. The results are a superior brightness and whiteness!
Argentium® Responsible Silver
What makes Argentium® silver responsible? Argentium® is certified that it is produced by using only recycled silver, contributing to the preservation of the environment. Argentium® does not contain nickel, which makes it a great alternative with it’s anti-allergy benefits. With it’s superior properties it reduces labor, time and manufacturing resources, conserving energy and natural resources, reducing wastes. It’s firestain resistance eliminates the need to use hazardous processes with removing the firestain, reducing toxic chemicals and undesirables in the workplace.
Argentium® guarantees tractability of its raw silver
It is certified that Argentium® is produced using only recycled silver.
Standard sterling silver standards require a minimum of 92.5% silver content, visit our blog on The Merit of Metals – Silver for in-depth information about sterling silver, the history and evolution of silver.
Argentium® silvers superior purity ensures that your finished product is of the highest quality, with a standard minimum 93.5% silver content. Argentium® .935 silver is a proprietary alloy that contains germanium and is trademarked and registered with Argentium® International Limited.
Argentium® is Highly Tarnish Resistant
The inclusion of germanium into a silver alloy has provided many tangible benefits to jewelers using Argentium® with a higher tarnish and firescale resistance due to a self-replenishing layer of germanium oxide that forms on the outside of Argentium® alloys. If Argentium® Silver is ever overpolished or overworked by a jeweler this layer of germanium oxide can be replenished by heating the jewelry in a 300°F(149°C) oven for three hours. Another benefit of Argentium® is the ability to fuse it to other pieces of Argentium® as well as high karat (18K or higher) gold.
Alloy information/ Properties
SSAR960: Argentium® Pro 960 Casting Grain
Casting Instructions (for average sized pieces- melt size 150gm – 1 Kg) Relative density: 10.3g/cm³, Melting range: 885-925ºC/ 1625-1697ºF, Casting Hardness: 55HV
Thin Castings (below 0.5mm): Flask temperature: 580-620°C/1076-1148°F, Metal temperature: 1025-1055°C/ 1877-1931°F
Medium Castings (0.5mm-1.2mm): Flask temperature: 580-620°C/1076-1148°F, Metal temperature: 1005-1025°C/ 1841-1877°F
Thick Castings (above 1.2mm): Flask temperature: 500-550°C/932-1022°F, Metal temperature: 985-1055°C/ 1805-1841°F
SSAR935: Argentium® Pro 335 Casting Grain
Casting Instructions (for average sized pieces- melt size 150gm – 1 Kg) Relative density: 10.3g/cm³, Melting range: 870-910ºC/ 1598-1670ºF, Casting Hardness: 72HV
Thin Castings (below 0.5mm): Flask temperature: 580-625°C/1076-1157°F, Metal temperature: 1010-1040°C/ 1850-1904°F
Medium Castings (0.5mm-1.2mm): Flask temperature: 550-580°C/1022-1076°F, Metal temperature: 990-1000°C/ 1814-1832°F
Thick Castings (above 1.2mm): Flask temperature: 480-520°C/896-968°F, Metal temperature: 970-990°C/ 1778-1814°F
In keeping with standard trade practices the suggested temperature above are only intended as a guide, due to variations in machines, casting conditions and termocouples, the size of flasks, how the pieces are sprued, plus the number of items on a tree. It is advised that for the best results, a trial casting is carried out for you to establish your optimum parameters.
The flask should be left at least 1 minute in the casting machine before removing. You may quench the tree once any feint glow from the button has fully disappeared, waiting an additional 5 minutes beyond the point of seeing any red heat, should ensure that there is no risk of cracking when quenched.
Argentium® must be allowed to cool to below 550ºC before you quench your piece. Cracking can occur if it is cast into a flask that is too cold. If using a torch to melt Argentium® be aware that it displays a paler color glow than Sterling silver. This is best seen when working in a shaded area.
When remelting, ensure the scrap Argentium® Silver has been thoroughly cleaned, pickled and is free from any contamination. Always use 50% new metal.
Tip: Do not mix Argentium® Silver with Sterling or Fine Silver.
After casting, the tree should be clean and white. if required, a 10% sulfuric acid solution is recommend for pickling. Other suitable pickle solutions are sodium bisuphate, weak Sparex and phosphoric acid (dilute as per supplier’s instructions). Please keep pickling time to a minimum. It is important not to use hydrofluoric acid with Argentium® Silver, as this will dissolve the protective germanium oxide layer.
Argentium® 935 Pro and 960 Pro casting can be hardened by heating in a clean over at 300ºC/572ºF for approximately 1.5 hours, then remove and allow to cool in air.
Polishing, Decreasing and Rinsing
The use of separate polishing media and mops for Argentium® Silver items is recommended- this prevents cross-contamination of another metal/alloy onto the surface of Argentium® pieces, which can diminish tarnish resistance.
Castings should be cleaned in an ultrasonic bath at 50ºC/122ºF for 2 minutes using a neutral (pH 7-9) aqueous soap solution. After decreasing, pieces should be rinsed with water at room temperature and dried (if using hot air this should ideally be below 70ºC/158ºF).
It is important not to use deionised/reverse osmosis water as this can damage the protective germanium oxide and reduce tarnish resistance.
Optimizing Tarnish Resistance
Argentium® Silver has the unique property where a layer of germanium oxide naturally develops on the surface of the metal to form a protective barrier (this oxide is self-replenishing if the surface is abraded). The formation of the germanium oxide layer can be accelerated by heating in air at 100ºC/212ºF for 3 hours. To optimize the process it is important that careful cleaning is undertaken.
The Mark of Authenticity
How should you mark your Argentium®? The Argentium® ‘Winged Unicorn’ is becoming a global endorsement for premium quality. Look for the Winged Unicorn as a guarantee of the finest silver.
G&S Metals is a full service refiner, offering you high returns and accountability on your silver refining. Visit our web site for more information or call the office.
Update: Argentium 960 casting grain is no longer available for purchase.