Dow Silastic T-4 RTV Silicone Rubber w/ T-4 Curing Agent Datasheet Dow Silastic T-4 RTV Silicone Rubber w/ T-4 Curing Agent

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  • Description for Dow Silastic T-4 RTV Silicone Rubber w/ T-4 Curing Agent

    High tear strength, suited for prototype design.

    *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
    Cure Method Curing Agent, Heat, RTV
    Cure Temperature (°C) 20 to 25, 23
    Cure Time (min) 720, 1,440
    Viscosity (cPs) 35,000

  • Technical Data for Dow Silastic T-4 RTV Silicone Rubber w/ T-4 Curing Agent

    *See Terms of Use Below

    Overview
    • Application Type
    • 1 Part or 2 Part
      • 2-Part
    • Material Form
      • Liquid
    • Chemistry
    • Cure Method
      • Heat
      • 2-Part Cure - Curing Agent
      • RTV (Room Temperature Vulcanization) - RTV
    • Brand
      • Silastic
    Specifications
    Cure Specs
    Cure Temperature (°C) 20 to 25, 23 Test Method
    Cure Time (min) 720, 1,440 Test Method
    Viscosity (cPs) 35,000 Test Method
    Linear Shrinkage (%) <0.10
    Work / Pot Time (min) 90 Test Method
    Mix Ratio 10:1 (by volume)
    Bond Strength
    General Bond Strength (psi) High
    Tear Strength (piw) 150 (ppi), 149, High Test Method
    Tensile Strength (psi) 971, 6.7 (Mpa) Test Method
    Hardness
    Shore A Hardness 40
    Elongation (%) 4
    Other Properties
    Flash Point (°F) 212.0

  • Best Practices for Dow Silastic T-4 RTV Silicone Rubber w/ T-4 Curing Agent

    *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

      Entrapped air should be removed in a vacuum chamber, allowing the mix to completely expand and then collapse. After a further 1 to 2 minutes under vacuum, the mix should be inspected, and if free of bubbles, then be used. A volume increase of three to five times will occur on vacuum deairing the mixture, so a suitably large container should be used.

    3. Mixing

      Weigh 100 parts of Silastic T-4 Base and 10 parts of Silastic T-4 Curing Agent 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. Mix sufficiently small quantities to ensure thorough mixing of base and curing agent.

    4. Curing

      All addition-cured silicone elastomers are susceptible to cure inhibition when in contact with ceratin materials and chemicals. Inhibition has occurred if the elastomer is only partially cured after 24 hours, or has a sticky surface in contact with another material. Amines and sulfur-containing materials are strong inhibitors, as are organotin salts used in condensation-cure silicone elastomers. Mixing containers, mold construction materials, originals and release agents should be checked for any inhibition effect before use.

  • Comparable Materials for Dow Silastic T-4 RTV Silicone Rubber w/ T-4 Curing Agent

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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) with SILASTIC T-4 curing agent
Cure Time Test Methods
Cure Time Test Method
720 min
1,440 min Cured for 24 hours at 23°C (73.4°F) with SILASTIC T-4 curing agent
Viscosity Test Methods
Viscosity Test Method
35,000 cPs Base and curing agent mixture (100:10 by weight)
Work / Pot Time Test Methods
Work / Pot Time Temperature
90 min 23°C
Tensile Strength Test Methods
Tensile Strength Cure Time Cure Temperature
971 psi 1,440 min 23°C
6.7 (Mpa) 1,440 min 23°C
Tear Strength Test Methods
Tear Strength Cure Time Cure Temperature Test Method
150 (ppi) 1,440 min 23°C Die B
149 piw 1,440 min 23°C ISO 34 Cutter (equivalent JIS K 6252, DIN 53515/angle nick 1.0mm).
High