Dow Silastic P-1 RTV Silicone Rubber

Dow Silastic P-1 RTV Silicone Rubber Datasheet
  • Description for Dow Silastic P-1 RTV Silicone Rubber

    High tear strength, suited for production of print pads, can be colored.

    *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, 25, 20 to 25
    Cure Time (min) Fast, 1,440, 480
    Viscosity (cPs) 13,500, Pourable
    Density (g/cm³) 0.001
  • Technical Data for Dow Silastic P-1 RTV Silicone Rubber

    • Application Type
    • 1 Part or 2 Part
      • 1 Part or 2 Part - 2 Part
    • Material Form
      • Liquid
    • Chemistry
    • Cure Method
      • 2-Part Cure - Base/Curing agent
    • Brand
      • Silastic
    Cure Specs
    Cure Temperature (°C) 20 to 25, 25, 20 to 25
    Cure Time (min) Fast, 1,440, 480
    Viscosity (cPs) 13,500, Pourable Test Method
    Linear Shrinkage (%) 0.10 Test Method
    Mix Ratio 10:1 (by volume), 100:10 (by weight)
    Bond Strength
    General Bond Strength (psi) High
    Tear Strength (piw) 131 (ppi), 23 (kN/m), High, Tear Resistance Test Method
    Tensile Strength (psi) 1,087, 7.5 (Mpa), 377, 261, 217, 217 Test Method
    Shore A Hardness 25, Medium Test Method
    Elongation (%) 9 Test Method
    Flexibility Flexible
    Other Properties
    Flash Point (°F) 140.0
    Density (g/cm³) 0.001 Test Method
    Business Information
    Shelf Life Details When stored at or below 25°C (77°F) in the original unopened containers, Silastic P-1 Base and SILASTIC P-1 Curing Agent have a usable life of 12 months from the date of production. SILASTIC P-1 Curing Agent can be sensitive to moisture and contamination. Keep in original vented container and ensure it is well closed after use.
    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 P-1 RTV Silicone Rubber

    *See Terms of Use Below

    1. Surface Preparation

      The surface of the molds in which the print pads are being cast should be clean and free of loose material.

      In all cases, it is advisable to check before casting that no adhesion occurs between the cured SILASTIC P-1 and the mold.

    2. Application

      Pour the mixed base and curing agent as soon as possible into the mold, avoiding air entrapment.

    3. Mixing

      Weigh 100 parts of SILASTIC P-1 Base and 10 parts of SILASTIC P-1 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 the 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 if free of air bubbles, can then be used. A volume increase of 3-5 times will occur on vacuum de-airing the mixture, so a suitably large container should be chosen.

      The base/curing agent ration MUST be between 100:9.5 and 100:10.5.

    5. Curing

      The catalyzed material will cure to a flexible rubber within 8 hours at room temperature (22-24°C/71.6-75.2°F) and the pad can then be removed. If the working temperature is significantly lower, the cure time will be longer. Heat acceleration the cure is possible.

  • Comparable Materials for Dow Silastic P-1 RTV Silicone Rubber

    *See Terms of Use Below

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Linear Shrinkage Test Methods
Linear Shrinkage Test Method Temp
0.10 % Cured for 24 hours at 25°C (77°F) 25°C
Viscosity Test Methods
Viscosity Test Method
13,500 cPs Base and curing agent mixture (100:10 by weight)
Tensile Strength Test Methods
Tensile Strength Cure Time Cure Temperature
1,087 psi 1,440 min 25°C
7.5 (Mpa) 1,440 min 25°C
377 psi
261 psi
217 psi
217 psi
Tear Strength Test Methods
Tear Strength Cure Time Cure Temperature Test Method
131 (ppi) 1,440 min 25°C Die B
23 (kN/m) 1,440 min 25°C Die B
Tear Resistance
Elongation Test Methods
Elongation Test Method
9 % Cured for 24 hours at 25°C (77°F)
Shore A Hardness Test Methods
Shore A Hardness Shore Hardness Test Method Hardness Temperature
25 Cured for 24 hours at 25°C (77°F) 25°C
Density Test Methods
Density Temperature Test Method
0.001 g/cm³ 25°C Cured for 24 hours at 25°C (77°F)