RTV Silicone, or Room-Temperature-Vulcanizing silicone, is a type of silicone rubber adhesive used for numerous sealing and bonding applications. There are many variations of RTV silicone that offer different characteristics specific to the most challenging applications. GRR offers the following series of RTV Silicone adhesives.

The ASI 502 100% RTV Silicone is a one-component, moisture cure, acetoxy silicone that cures to form an extremely durable rubber that can withstand a variety of extreme environments. Unlike many organic sealants, ASI 502 is extremely resistant to degradation, weathering, extreme temperatures, and mold and mildew. ASI 502 meets the requirements of NSF Standard 51 and FDA Regulation No. 21 CFR 177.2600 for food grade applications. ASI 502 100% RTV Silicone can be applied to bother vertical and overhead joints without sagging and is easy to extrude at both hot and cold temperatures. It will adhere to most common building materials as well.


  • 100% Acetoxy RTV Silicone
  • Mold & Mildew Resistant
  • Resistant to UV Degradation And Weathering
  • Withstands Extreme Cold & Extreme Heat
  • 25% Joint Movement Capability
  • One-Component, Easy To Use Formulation


  • Easy to Extrude At Cold Temperatures
  • Non-Slump, Can Use On Overhead & Vertical Applications
  • Excellent For Indoor & Outdoor Applications
  • Creates A Waterproof Seal
  • Conforms, Meets & Exceeds

Technical Data


Physical PropertiesTest MethodResult
ViscosityASI Test Method582,000 cps (Spindle 7, 4rpm)
Skin Formation TimeASI Test Method10 minutes (70°F, 50% RH)
DensityASTM D14758.5 lbs./gal
HardnessASTM C66125 (Shore A)
Extrusion RateASI Test Method365 g/min
Tensile StrengthASTM D412264 psi
Elongation at BreakASTM D4125
Application TemperatureASI Test Method-35°F to 150°F
Gun GradeASI Test MethodPass (Non-Slump)
QUV TestingASTM G26Pass (10,000 hrs)
Service TemperatureASI Test Method-50°F to 400°F
Typical Cure RateASI Test Method24 hrs. (1/8” bead)
Strength will start to develop immediately and continue increasing for 7 days after application. ASI recommends testing strength and adhesion on the 7th day. ASI 502 suggested application temperature range: -35°F to 150°F. ASI 502 can be used at temperatures higher than 400°F for intermittent periods. Testing should be done to confirm temperature requirements are met.