ASI 306



ASI 306 Electronic Grade Self-Leveling Silicone is a one component, RTV (room temperature vulcanizing) product that can be used for encapsulating, coating and sealing.

No acetic acid or other corrosive by-products are generated during its cure which allows the ASI 306 to be used around sensitive metals and electronics. ASI 306 cures at room temperature to form a tough, high-modulus rubber. ASI 306 has excellent unprimed adhesion to a very wide range of substrates including metals (i.e. chrome), glass, most woods, ceramics and various plastics. ASI 306 will resist weathering, moisture, vibration, ozone, ultra-violet and temperature extremes. It will also resist various chemicals and oils depending on the chemical and duration of the contact.


  • Excellent Unprimed Adhesion
  • Resistant To UV Degradation & Weathering
  • Low Viscosity, Self-Leveling
  • One-Component, Moisture Curing
  • Non-Corrosive Formulation
  • Ideal For Encapsulating, Sealing & Coating
  • Does Not Contain Solvent or Acetic Acid

Physical properties

ViscosityASI Test Method35,000 cps (Spindle 7, 4 rpm)
Skin Formation TimeASI Test Method10 minutes (70°F, 50% RH)
DensityASTM D14758.5 lbs./gal
HardnessASTM C66125 (Shore A)
Extrusion RateASI Test MethodN/A
Tensile StrengthASTM D412300 psi
Elongation at BreakASTM D412300%
Lap ShearASTM D412N/A
Gun GradeASI Test MethodPass (Self-Leveling)
QUV TestingASTM G154Pass (10,000 hrs.)
Service TemperatureASI Test Method-30°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 306 suggested application temperature range: -30°F to 150°F.

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

Common Substrates

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

Common Applications

  • Encapsulating Electronics
  • Thin Section Potting
  • Horizontal Joint & Gap Filling
  • Coating

Speak with a sales engineer to discuss ASI 306 or any of our other products or manufacturing services! Use our contact form or call 800-325-7040 now.