Dow Silastic 55U

Dow Silastic 55U Datasheet
  • Description for Dow Silastic 55U

    High mechanical properties; high tear strength; serviceable over a wide temperature range; pigmentable.

    *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/catalyst
    Cure Temperature (°C) 116, 200
    Cure Time (min) 5.00, 240
    Color Nearly transparent
  • Technical Data for Dow Silastic 55U

    • Application Type
    • 1 Part or 2 Part
      • 1 Part or 2 Part - 2 Part
    • Material Form
      • Liquid
    • Chemistry
    • Cure Method
      • 2-Part Cure - Base/catalyst
    • Color
      • Clear / Transparent - Nearly transparent
    • Brand
      • Silastic
    Cure Specs
    Cure Temperature (°C) 116, 200 Test Method
    Cure Time (min) 5.00, 240 Test Method
    Bond Strength
    Tear Strength (piw) High, 180 (ppi) Test Method
    Tensile Strength (psi) 1,295, 1,290 Test Method
    Shore A Hardness 49, 50 Test Method
    Elongation (%) 630, 485 Test Method
    Modulus (psi) 200, 280 Test Method
    Other Properties
    Specific Gravity 1.170 Test Method
    Business Information
    Shelf Life Details When stored at or below 60°C (140°F) in the original unopened containers, this product has a usable life of 36 months from the date of production.
    Shelf Life Type from the date of production
    Shelf Life (mon) 36
  • Best Practices for Dow Silastic 55U

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  • Comparable Materials for Dow Silastic 55U

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Cure Temperature Test Methods
Cure Temperature Cure Time Test Method
116°C Press cured
200°C Post cured
Cure Time Test Methods
Cure Time Test Method
5.00 min Press cured
240 min Post cured
Tear Strength Test Methods
Tear Strength Test Method
180 (ppi) ASTM D624, DIE B
Tensile Strength Test Methods
Tensile Strength Cure Time Cure Temperature Test Method
1,295 psi ASTM D412
1,290 psi 4,200 min 225°C ASTM D412
Elongation Test Methods
Elongation Test Method
630 % ASTM D412
485 % ASTM D412, Heat aged, 70hrs 225°C (437°F)
Modulus Test Methods
Modulus Test Method
200 psi ASTM D412, at 100% elongation
280 psi ASTM D412, at 100% elongation, Heat aged, 70hrs 225°C (437°F)
Shore A Hardness Test Methods
Shore A Hardness Shore Hardness Test Method Hardness Temperature
49 Hardness/Durometer Test Method 225°C
50 ASTM D2240
Specific Gravity Test Methods
Specific Gravity Temperature Test Method
1.170 23°C ASTM D792