Dow Silastic T-2 Base / T-2 High Durometer Curing Agent

Dow Silastic T-2 Base / T-2 High Durometer Curing Agent Datasheet
  • Description for Dow Silastic T-2 Base / T-2 High Durometer Curing Agent

    Translucent high strength silicone moldmaking rubber.

    Note: This material has been discontinued. Please view the Comparable Materials tab or call us at (262) 293-7970 for additional help.

    *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) 25, 60, 20 to 25, 20, 25, 30, 35, 40, 50
    Cure Time (min) Very Fast, 1,440, 120, 720, 840, 600, 420, 240, 120, 45
    Viscosity (cPs) Low, 55,000
    Chemical Resistance Inhibition
  • Technical Data for Dow Silastic T-2 Base / T-2 High Durometer Curing Agent

    Overview
    • 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
    Specifications
    Cure Specs
    Cure Temperature (°C) 25, 60, 20 to 25, 20, 25, 30, 35, 40, 50
    Cure Time (min) Very Fast, 1,440, 120, 720, 840, 600, 420, 240, 120, 45
    Viscosity (cPs) Low, 55,000 Test Method
    Linear Shrinkage (%) <0.10 Test Method
    Work / Pot Time (min) 60, 180, 140, 105, 65, 35, 15 Test Method
    Mix Ratio 10:1 (by volume), 100:10 (by weight)
    Bond Strength
    General Bond Strength (psi) High
    Tear Strength (piw) 120 (ppi), 130 to 140 (ppi) Test Method
    Tensile Strength (psi) 800, 800 to 1,000 Test Method
    Material Resistance
    Chemical Resistance Inhibition
    Hardness
    Shore A Hardness 50, 47 to 53, Medium, High Test Method
    Elongation (%) 3 Test Method
    Flexibility Flexible
    Other Properties
    Specific Gravity 1.120 Test Method
    Flash Point (°F) 212.0
    Business Information
    Shelf Life Details SILASTIC T-2 Silicone Moldmaking Rubber base, and both of its curing agents should be stored at or below room temperature. The materials have a usable life of 12 months from date of production. Refer to product packaging for “Use By” date. Ensure that containers are tightly closed after use.
    Shelf Life Type from date of production
    Shelf Life (mon) 12
  • Best Practices for Dow Silastic T-2 Base / T-2 High Durometer Curing Agent

    *See Terms of Use Below

    1. Surface Preparation

      The surface of the original should be clean and free of loose material. When correctly mixed with either curing agent, SILASTIC T-2 Moldmaking rubber releases well from most substrates, a release agent or barrier coat may be needed to seal the surface before casting the silicone. Release coatings such as petroleum jelly or others can be used. Before casting the silicone rubber, it is advisable to verify that no adhesion has occurred between SILASTIC T-2 and the master mold or frame.

    2. Application

      Pour the mixed base and curing agent onto the master, avoiding air entrapment.

    3. Mixing

      Weigh out 100 parts of SILASTIC T-2 Silicone Rubber base with 10 parts of either curing agent in a clean container. Mix until the curing agent is completely dispersed in the base. Mix suitably small quantities to ensure thorough mixing of the base and curing agent and adequate working time.

    4. Deairing/Degassing

      Entrapped air should be removed in a vacuum chamber, allowing the mixture to completely expand and then collapse. After an additional five minutes, the vacuum can be released. A value increase of four to five times will occur upon vacuum de-airing of the mixture, so a suitably large container should be chosen. Pour the mixed base and curing agent onto the master, avoiding air entrapment. Some bubbles will remain in the material after the vacuum de-airing – these will rise to the surface and break during the working time.

    5. Curing

      The material should be allowed to stand for about 30 minutes at room temperature before heat curing. The catalyzed mixture will cure in thick sections to a flexible rubber, typically within 12 hours at room temperature, at which time the part can be demolded. Heat will greatly accelerate the cure. There may be some contraction upon cooling due to the coefficient of thermal contraction differences between the silicone rubber and the original. The higher the curing temperature, the greater the differences and dimensions.

  • Comparable Materials for Dow Silastic T-2 Base / T-2 High Durometer Curing Agent

    *See Terms of Use Below

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Linear Shrinkage Test Methods
Linear Shrinkage Test Method Temp
<0.10 % Cured 24 hours at 25°C (77°F) 25°C
Viscosity Test Methods
Viscosity Test Method
Low
55,000 cPs Mixed – 100 Parts Base to 10 Parts Curing Agent by Weight
Work / Pot Time Test Methods
Work / Pot Time Temperature
60 min 23°C
180 min 20°C
140 min 25°C
105 min 30°C
65 min 35°C
35 min 40°C
15 min 50°C
Tensile Strength Test Methods
Tensile Strength Cure Time Cure Temperature
800 psi 1,440 min 25°C
800 to 1,000 psi 120 min 60°C
Tear Strength Test Methods
Tear Strength Cure Time Cure Temperature Test Method
120 (ppi) 1,440 min 25°C Die B
130 to 140 (ppi) 120 min 60°C Die B
Elongation Test Methods
Elongation Test Method
3 % Cure 2 hours at 60°C (140°F)
Shore A Hardness Test Methods
Shore A Hardness Shore Hardness Test Method Hardness Temperature
50 Cure 2 hours at 60°C (140°F) 60°C
47 to 53 Cure 2 hours at 60°C (140°F) 60°C
Medium 60°C
High 60°C
Specific Gravity Test Methods
Specific Gravity Test Method
1.120 100 Parts Base to 10 Parts Curing Agent by Weight