Dow Silastic 591 Datasheet Dow Silastic 591

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  • Description for Dow Silastic 591

    Fast heat cure; low shrinkage; no cure by-products; low compression set.

    *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, Part A/Part B
    Cure Temperature (°C) 171, 200
    Cure Time (min) Fast, 5.00, 0.13 to 0.23
    Color Off White
    Key Specifications UL (Underwriters Laboratory), ULC (Underwriters Laboratories of Canada), NFPA (National Fire Protection Association): UL 94: UL 94 V-1
  • Technical Data for Dow Silastic 591

    • Application Type
    • 1 Part or 2 Part
      • 2-Part
    • Material Form
      • Liquid
    • Industry
    • Chemistry
    • Application Method
      • Dispenser - Meter mix equipment
    • Cure Method
      • Heat
      • 2-Part Cure - Part A/Part B
    • Color
      • Off-White - Off White
    • Key Specifications
      • UL (Underwriters Laboratory), ULC (Underwriters Laboratories of Canada), NFPA (National Fire Protection Association) : UL 94 : V-1 - UL 94 V-1
    • Brand
      • Silastic
    Cure Specs
    Cure Temperature (°C) 171, 200 Test Method
    Cure Time (min) Fast, 5.00, 0.13 to 0.23 Test Method
    Linear Shrinkage (%) Low
    Mix Ratio 1:1 (by volume)
    Bond Strength
    Tear Strength (piw) 73 (ppi) Test Method
    Tensile Strength (psi) 485 Test Method
    Shore A Hardness 51 Test Method
    Elongation (%) 4 Test Method
    Other Properties
    Specific Gravity 1.540 Test Method
    Flash Point (°F) 212.0
    % Solids (%) 100
    Business Information
    Shelf Life Details When stored at or below 32°C (90°F) in the original, unopened containers this product has a usable life of 18 months from the date of production.
    Shelf Life Type from the date of production.
    Shelf Life (mon) 18
  • Best Practices for Dow Silastic 591

    *See Terms of Use Below

    1. Mixing

      The A and B components are supplied strained and de-aired to be used as lot matched kits. Mix parts A and B in a 1:1 ratio. Meter mix equipment which pumps, meters and mixes the two components without the incorporation of air is strongly recommended for production.

    2. Deairing/Degassing

      If air bubbles are entrapped during mixing the mixture must be thoroughly de-gassed under vacuum.

    3. Curing

      SILASTIC 591 cures rapidly at elevated temperatures. A 2mm cross-section requires 8-14 seconds at 200°C (392°F). The cure time depends on the thickness and the cure temperature used. Cure can be inhibited by contact with certain materials such as amines, sulphur and tin complexes.

    4. Clean-Up

      The uncured silicone can readily be removed by most hydrocarbon solvents. Polar solvents, such as ketones and alcohols, are not suitable.

  • Comparable Materials for Dow Silastic 591

    *See Terms of Use Below

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Cure Temperature Test Methods
Cure Temperature Cure Time Test Method
171°C Press cured
Cure Time Test Methods
Cure Time Test Method
5.00 min Press cured
0.13 to 0.23 min
Work / Pot Time Test Methods
Work / Pot Time Temperature
Tensile Strength Test Methods
Tensile Strength Test Method
485 psi ASTM D412 DIE C
Tear Strength Test Methods
Tear Strength Test Method
73 (ppi) ASTM D624 DIE B
Elongation Test Methods
Elongation Test Method
4 % ASTM D412 DIE C
Shore A Hardness Test Methods
Shore A Hardness Shore Hardness Test Method
51 Hardness/Durometer Test Method
Specific Gravity Test Methods
Specific Gravity Test Method
1.540 ASTM D792