Dow Silastic J RTV Silicone Rubber

Dow Silastic J RTV Silicone Rubber Datasheet
  • Description for Dow Silastic J RTV Silicone Rubber

    Good tear resistance, high durometer.

    *See Terms of Use Below

    Brand Silastic
    Application Type Mold-Making
    1 Part or 2 Part 2 Part
    Material Form Liquid
    Manufacturer Dow
    Chemistry Silicone rubber
    Cure Method Heat, Base/curing agent
    Cure Temperature (°C) 20 to 25, 23, 23
    Cure Time (min) 1,080 to 1,440, 1,440
    Viscosity (cPs) 85000 (mPa.s), Pourable
    Chemical Resistance Excellent
    High Temperature Resistance (°C) High, 200
    Density (g/cm³) 0.001
  • Technical Data for Dow Silastic J RTV Silicone Rubber

    • Application Type
    • 1 Part or 2 Part
      • 1 Part or 2 Part - 2 Part
    • Material Form
      • Liquid
    • Chemistry
    • Cure Method
      • Heat
      • 2-Part Cure - Base/curing agent
    • Brand
      • Silastic
    Cure Specs
    Cure Temperature (°C) 20 to 25, 23, 23 Test Method
    Cure Time (min) 1,080 to 1,440, 1,440 Test Method
    Viscosity (cPs) 85000 (mPa.s), Pourable Test Method
    Linear Shrinkage (%) 0.10 Test Method
    Work / Pot Time (min) 120 to 80 Test Method
    Mix Ratio 10:1 (by volume), 100:10 (by weight)
    Bond Strength
    General Bond Strength (psi) High
    Tear Strength (piw) 15 (kN/m) Test Method
    Tensile Strength (psi) 5.5 (Mpa) Test Method
    Material Resistance
    Chemical Resistance Excellent
    High Temperature Resistance (°C) High, 200
    Shore A Hardness 56, High Test Method
    Elongation (%) 3 Test Method
    Flexibility Flexible
    Other Properties
    Flash Point (°F) 213.8
    Density (g/cm³) 0.001 Test Method
    Business Information
    Shelf Life Details When stored at or below 43°C (109.4°F) in the original unopened containers, SILASTIC J Base and SILASTIC J Curing Agent have a usable life of 12 months from the date of production.
    Shelf Life Type from the date of production
    Shelf Life (mon) 12
    Not Good For
    Don't Use For food molding, dental, human skin molding applications.
  • Best Practices for Dow Silastic J RTV Silicone Rubber

    *See Terms of Use Below

    1. Surface Preparation

      The surface of the original should be clean and free of loose material. If necessary, and in particular with porous substrates, use a suitable release agent such as petroleum jelly or PTFE.

    2. Application

      Pour the mixed base and curing agent as soon as possible onto the original, avoiding air entrapment.

    3. Mixing

      Thoroughly stir SILASTIC J Curing Agent before use. Weigh 100 parts of SILASTIC J Base and 10 parts of SILASTIC J Curing Agent (see handling precautions) in a clean container, then mix together until the curing agent is completely dispersed in the base. Hand or mechanical mixing can be used, but do not mix for an extended period of time or allow the temperature to exceed 35°C (95°F). Mix sufficiently small quantities to ensure thorough mixing of base and curing agent.

    4. Deairing/Degassing

      It is strongly recommended that entrapped air be removed in a vacuum chamber, allowing the mix to completely expand and then collapse. After a further 1-2 minutes under vacuum, the mix should be inspected and if free of air bubbles, can then be used. A volume increase of 3-5 times will occur on vacuum de-airing the mixture, so a suitably large container should be chosen.

      Note: If no vacuum de-airing equipment is available, air entrapment can be minimized by mixing a small quantity of base and curing agent, then using a brush, painting the original with a 1-2mm layer. Leave at room temperature until the surface is bubble free and the layer has begun to cure. Mix a further quantity of base and curing agent and proceed as follows to produce a final mold.

    5. Curing

      The catalyzed material will cure to a flexible rubber within 18-24 hours at room temperature (2224° C/ 71.675.2° F) and the mold can then be removed. If the working temperature is significantly lower, the cure time will be longer. Heat accelerating the cure is possible, but this will produce some apparent shrinkage of the mold due to differences in volume contraction on cooling between the silicone rubber and the original. The higher the curing temperature, the greater the likely differences in dimensions. As a guide, a 5mm section of SILASTIC J will heat cure in 30 minutes at 65°C (149°F) or in 12 minutes at 100°C (212°F) once the material has reached this temperature.

  • Comparable Materials for Dow Silastic J RTV Silicone Rubber

    *See Terms of Use Below

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Cure Temperature Test Methods
Cure Temperature Cure Time Test Method
20 to 25°C
23°C Cured for 24 hours at 23°C (73.4°F)
Cure Time Test Methods
Cure Time Test Method
1,080 to 1,440 min
1,440 min Cured for 24 hours at 23°C (73.4°F)
Linear Shrinkage Test Methods
Linear Shrinkage Test Method Temp
0.10 % Cured for 24 hours at 23°C (73.4°F) 23°C
Viscosity Test Methods
Viscosity Test Method
85000 (mPa.s) Base and Curing Agent mixture (100:10 by weight)
Work / Pot Time Test Methods
Work / Pot Time Temperature
120 to 80 min 23°C
Tensile Strength Test Methods
Tensile Strength Cure Time Cure Temperature
5.5 (Mpa) 1,440 min 23°C
Tear Strength Test Methods
Tear Strength Cure Time Cure Temperature
15 (kN/m) 1,440 min 23°C
Elongation Test Methods
Elongation Test Method
3 % Cured for 24 hours at 23°C (73.4°F)
Shore A Hardness Test Methods
Shore A Hardness Shore Hardness Test Method Hardness Temperature
56 Cured for 24 hours at 23°C (73.4°F) 23°C
Density Test Methods
Density Temperature Test Method
0.001 g/cm³ 23°C Cured for 24 hours at 23°C (73.4°F)