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S88 Master Alloy for Sterling Silver
1 oz. (28 grams).
Our Price:
$
15.25
Product Code:
S88
Qty:
Description
Instructions
S88 is a master alloy for adding to fine silver to make Sterling Silver. Will cast without fire scale. 1 oz. (28 grams). Tarnish resistant.
S-88 Master Alloy
Purpose
S-088 is a master alloy for adding to fine silver to make Sterling Silver.
This alloy was developed for those who wish to alloy their own sterling.
S-88 will cast without fire scale.
The advantages over standard sterling are:
Reduced gas porosity (S-88 contains de-oxidizers which resist oxygen absorption)
Reduced shrinkage porosity (better solidification characteristics reduce shrinkage)
S-88 alloy may be re-used indefinitely with a 50% fresh mix
Less finishing rejects from fire scale and porosity
Melting
Traditional methods of melting regular sterling silver (i.e. as cool as possible) will cause a variety of problems.
Most failures of S-88 alloy are caused by too low of a melt temperature.
Metal smiths familiar with silicon de-oxidized gold casting alloys should have less trouble adjusting to the appearance of the silver.
Mixing
Use 92.35% fine silver and 7.5% S-88.
92.7% fine silver and 7.3% S-88 is recommended.
Example: 500 dwt, add 462.5 dwt of fine silver & 37.5 dwt S-88.
Melting and Casting Temperatures
Melting temperature for mixing sterling: 1040°C / 1904°F.
Temperature range for casting serling: 990° - 1020°C / 1814° - 1868°F.
Fluxing
Boracic acid
is the recommended flux.
Do not use carbon containing fluxes or charcoal.
Skim any surface oxides off the surface before stirring.
Quench Time
15 to 20 minutes.
Hardness and Heat Treatment
This silver as cast will have a hardness similar to traditional sterling silver.
It can be hardened further by heat treatment at 300°C / 575°F for one hour.
Investment Removal
Most standard investment removers will successfully renmove the investment powder. The best solutions are the sulfuric and hydroflouric based products.
Re-Melting
50% fresh mix is recommended.
Flask Temperature
Use your regular flask temperatures.
Notes
Fire scale is completely eliminated.
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