Silicone Platinum RTV
Food Grade (R-2237 SL)
R-2237 SL A/B Two-Part, Platinum RTV (Addition Cure) silicone rubber with an extended work time (Pot Life 1.5 Hours) designed for mold making. This system is ideal for making molds used for food contact as well as standard mold making applications. R-2237SL is great for soap, wax, chocolate, candies or other food products. R-2237SL has been tested to meet the requirements of FDA Extraction Test: CFR 177.2600, Code Of Federal Regulations www.access.gpo.gov/nara/cfr-table-search.html For further information, please contact technical support.
Physical Properties (TYPICAL VALUES):
Uncured Compound Cured Compound 24 hrs. @ 77F (25C)
Color: Green-mixed
Mix Viscosity @ RT: 60,000 Specific Gravity: 1.08
Mixing Ratio A/B: 10/1 Durometer: 35 +/-5
Pot Life: 1.5 Hours Tensile Strength (PSI): 700
Tear Strength (PSI): 80
Elongation %: 300
Mixing Instructions:
The base and curing agent are mixed just before using. Mix 10 parts base to 1 part-curing agent by weight. Automatic mixing equipment or manual mixing may be used to combine base and curing agent. Immediately after mixing, place the material in a vacuum chamber to remove trapped air. As the vacuum is drawn, the material will expand as much as four times its original volume. Remove from vacuum chamber and pour very gently, so as not to incorporate air into the material. If, after overnight cure, surface is tacky, add mild heat to finish cure (150F for 30 minutes).
Inhibition:
Certain materials will cause inhibition or neutralizing of the curing agent. These materials are sulpher and organo-metallic salt containing compounds found in organic rubbers and many condensation cure RTV, chloride solvents – aimnes. Avoid using latex gloves, oil based clays and Tin/Condensation cured RTV’s. Inhibition may easily be determined by brushing a small quantity of this material over the surface and allowing it to cure. If material remains tacky and gummy after the curing time, then the part’s surface is acting as an inhibitor. **See Addition Cure Technical Data Sheet for inhibiting materials
The information and data contained herein are based on information we believe reliable. Each user of the material should thoroughly test any application and independently conclude satisfactory performance before commercializing. Suggestions of uses should not be taken as inducements to infringe on any particular patent.