SRS GLOBAL™ is used for high quality gold casting in exacting circumstances and is ideal in situations where top quality is required at a more economical price. GLOBAL™ fits between EUROVEST™ and CLASSIC™ in the SRS product range - in terms of price close to EUROVEST™ but very close to CLASSIC™ in terms of quality and performance.
SRS GLOBAL™ can be used on all metals and in particular on gold up to 18Ct. It will give defect free castings and a superior surface finish every time. GLOBAL™ is designed to offer flexibility in use no matter what the situation and will give perfect results time after time. GLOBAL™ breaks away and cleans easily after casting.
SRS GLOBAL™ is manufactured under ISO9001 quality system at the SRS factory in UK. It should be used in the same way as CLASSIC™ and EUROVEST™ i.e. at 100/38. The mixing, burnout and casting schedules are exactly the same.
Powder / Water Ratio : 100/38
Working Time @ 22c Slurry Temp : 8 min.
Gloss Off Time @ 22c Slurry Temp : 10-12 min.
Thermal Expansion At 750c : 0.8%
Powder can be both dry and steam dewaxed with excellent result. As a general rule the larger the flask the longer the dewax time. Dry dewax in a furnace should take place at about 230c. For a 6″x4″ jewellery mold, 3 hours will be sufficient to remove the bulk of the wax and 2 hours should be sufficient for steam dewax.
Burnout cycles will depend very much on the size of the flask. The larger the flask or the waxes therein the longer and more gradual the burnout must be. For 6”x4” mould will only need 12 hours. In addition the furnace must have a good supply of air in order to achieve a clean burnout. Carbon deposits from the wax must combine with oxygen to form CO2 and thus excape through the pores of the investment. If after Burnout your mould is a gray colour you need to get more air into the furnace-do not increase the temperature, this will only damage the investment.
After completion of burnout, the flask should be cooled to proper casting temperature. The flask can then be cast by either centrifugal or vacuum casting methods.
Temperature of the last 1-2 hours of burnout must be adjusted at correct temperature for casting. If held for less than 1 hour, the core of the flasks will be at a much higher temperature, and may result in metal mold reaction.
The casting temperature varies considerable depending on the size of wax piece and type of metal to be cast. Please contact us for our recommendations.