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Your cart is empty.SAFE-T-THERM GRAS heat transfer fluid is an inhibited propylene glycol solution designed for use in hydronic systems for freeze and corrosion protection. SAFE-T-THERM GRAS heat transfer fluid is formulated with ingredients which are generally recognized as safe (GRAS) by the FDA for use as an aqueous heat transfer medium for closed primary and secondary refrigeration and cooling systems. Components in our formulation conform to the requirements of 21 CFR 184.1666; 21 CFR 182.6285; 21CFR 74.1705, 74.1706 & 74.2340 as applicable. A letter from the USDA can be provided upon request, and the product is currently registered with NSF International and listed in the NSF White Book - Nonfood Compounds Listing Directory. SAFE-T-THERM GRAS includes an orange dye, for leak detection. SAFE-T-THERM GRAS is designed to protect components commonly found in residential and commercial systems. SAFE-T-THERM GRAS can also be used with aluminum at temperatures below 150°F (66°C). At temperatures above 150°F (66°C), use of SAFE-T-THERM GRAS is not recommended because the inhibitors will not fully protect aluminum components in the system. SAFE-T-THERM GRAS should not be used with galvanized steel, Polyvinyl chloride (PVC) or Chlorinated polyvinyl chloride (CPVC). Recommended use temperature range: -50°F (-45°C) to 230°F (110°C)