SIGMA
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FOR CASTING SILVER BRASS, AND BRONZE Powder: Water Ratio (38% - 40%) • Increasing the powder amount 1% will decrease the total working time for approximately 30 seconds Automatic Vac. Mixing Mach. Allow to sit undistributed for 90-120 minutes before burnout SIGMA Prestige SIGMA™ is a high value, low cost gypsum bonded investment powder developed by Certus to provide the user and industry with an investment powder engineered specially to eliminate costly surface defects associated with casting the most difficult designs and shapes cast in silver and bronze. FEATURES • Uses the highest purity raw materials available • Variable water to powder ratio, 38 - 40/100 for thick to thin designs • User friendly formula, easy to mix and use • Superior thermal shock resistance to temperature. Highly resistant to flashing and cracking • Special proprietary control chemicals easily remove air from the investment slurry and pattern surface to provide super smooth, bubble free castings time after time • Provides extra smooth, dense, flash free castings • Easy removal during water quench, • Better casting results, even when less than perfect mixing techniques are observed • ZERO defects policy. All batches test cast in silver to ensure perfect quality before shipping Conventional Mixing Mach. • Allow to sit undistributed for 90-120 minutes before burnout