ASI 502

High Performance 100% RTV Silicone


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 both 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.


  • Mold & Mildew Resistant Resistant
  • To UV Degradation & Weathering
  • Withstands Extreme Cold & Extreme Heat
  • One-Component, Easy To Use Formulation
  • Adheres To Most Common Building Substrates
  • Easy To Extrude At Cold Temperatures
  • Non-Slump, Can Use On Overhead & Vertical Applications
  • Excellent For Indoor & Outdoor Applications
  • Creates A Waterproof Seal

Physical properties

Physical PropertiesTest MethodResult
ViscosityASI Test Method675,000 cps (Spindle 7, 4 rpm)
Skin Formation TimeASI Test Method13 minutes (70°F, 50% RH)
DensityASTM D14758 Ibs./gal
HardnessASTM C66121 (Shore A)
Extrusion RateASI Test Method632 g/min
Tensile StrengthASTM D412232 psi
Elongation at BreakASTM D412490%
Application TemperatureASI Test Method-35°F to 150°F
Gun GradeASI Test MethodPass (Non-Slump)
QUV TestingASTM G154Pass (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.

Information on this data sheet can change without notice and it is therefore not recommended that these figures be used in spec writing. If you have any questions contact manufacturer ‘s sales and technical service department.

Conforms / Meets / Exceeds

  • ASTM C920 Class 25, Type S, Grade NS, Use NT, G, O
  • TT-S-01543A
  • TT-S-00230-C
  • MIL-A-46106A
  • NSF Standard 51
  • FDA Regulation No. 21 CFR 177.2600
  • UL Recognized
  • VOC Compliant (23 grams/liter ASTM D2369)

Common Substrates

  • Glass
  • Granite
  • Marble
  • Most Fiberglass
  • Most Wood Types
  • Aluminum
  • Ceramic
  • Natural & Synthetic Fiber
  • Most Painted Surfaces
  • Some Plastics

Common Applications

  • Walk-In Freezer Manufacturing & Installation
  • RV & Trailer Manufacturing
  • Countertop Installation & Sealing
  • Formed-In-Place Gasket Applications
  • Bathroom Installation & Sealing
  • Industrial Manufacturing Applications
  • HVAC Applications
  • Fireplace Manufacturing
  • Sheet Metal Work & Sealing
  • Marine Applications
  • General Sealing & Bonding

For a complete list of applications & substrates or more product information, please contact us.

Speak with a sales engineer to discuss ASI 502 or any of our other products or manufacturing services! Use our contact form or call 800-325-7040 now.