Dow Silastic T-4 RTV Silicone Rubber w/ T-4 0 Curing Agent

Dow Silastic T-4 RTV Silicone Rubber w/ T-4 0 Curing Agent Datasheet
  • Description for Dow Silastic T-4 RTV Silicone Rubber w/ T-4 0 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 rubber
    Cure Method Base/curing agent
    Cure Temperature (°C) 20 to 25, 23
    Cure Time (min) 720, 1,440
    Viscosity (cPs) 35000 (mPa.s), Pourable
    Chemical Resistance Excellent
    High Temperature Resistance (°C) 200
    Durability Very tough
  • Technical Data for Dow Silastic T-4 RTV Silicone Rubber w/ T-4 0 Curing Agent

    Overview
    • Application Type
    • 1 Part or 2 Part
      • 1 Part or 2 Part - 2 Part
    • Material Form
      • Liquid
    • Chemistry
    • Application Method
      • Brush
    • Cure Method
      • 2-Part Cure - Base/curing agent
    • Brand
      • Silastic
    Specifications
    Cure Specs
    Cure Temperature (°C) 20 to 25, 23 Test Method
    Cure Time (min) 720, 1,440 Test Method
    Viscosity (cPs) 35000 (mPa.s), Pourable Test Method
    Linear Shrinkage (%) <0.10
    Work / Pot Time (min) 90 Test Method
    Mix Ratio 10:1 (by volume), 100:10 (by weight)
    Bond Strength
    General Bond Strength (psi) High
    Tear Strength (piw) 180 (ppi), 177, High Test Method
    Tensile Strength (psi) 942, 6.5 (Mpa) Test Method
    Material Resistance
    Chemical Resistance Excellent
    High Temperature Resistance (°C) 200
    Hardness
    Durability Very tough
    Shore A Hardness 40, High Test Method
    Elongation (%) 4 Test Method
    Flexibility Flexible
    Other Properties
    Specific Gravity 0.960
    Flash Point (°F) 212.0
    Business Information
    Shelf Life Details When stored at or below 30°C (86°F) in the original unopened containers SILASTIC T-4 Base, SILASTIC T-4 Curing and SILASTIC T-4 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 T-4 RTV Silicone Rubber w/ T-4 0 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

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

    3. Mixing

      Weigh 100 parts of SILASTIC T-4 Base and 10 parts of SILASTIC T-4 or SILASTIC T-4 O 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 can be used if free of air bubbles. 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 12 hours at room temperature (22-24°C/71.6-75.2°F) and the mold can 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.

  • Comparable Materials for Dow Silastic T-4 RTV Silicone Rubber w/ T-4 0 Curing Agent

    *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) with SILASTIC T-4 O 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 O curing Agent
Viscosity Test Methods
Viscosity Test Method
35000 (mPa.s) Base and curing agent mixture (100:10 by weight)
Pourable
Work / Pot Time Test Methods
Work / Pot Time Temperature
90 min 23°C
Tensile Strength Test Methods
Tensile Strength Cure Time Cure Temperature
942 psi 1,440 min 23°C
6.5 (Mpa) 1,440 min 23°C
Tear Strength Test Methods
Tear Strength Cure Time Cure Temperature Test Method
180 (ppi) 1,440 min 23°C Die B
177 piw 1,440 min 23°C ISO 34 Cutter (equivalent JIS K 6252, DIN 53515/angle nick 1.0mm).
High
Elongation Test Methods
Elongation Test Method
4 % Cured for 24 hours at 23°C (73.4°F)
Shore A Hardness Test Methods
Shore A Hardness Shore Hardness Test Method Hardness Temperature
40 Cured for 24 hours at 23°C (73.4°F) 23°C
High