Dow Silastic M-2 RTV Silicone Rubber

Dow Silastic M-2 RTV Silicone Rubber Datasheet
  • Description for Dow Silastic M-2 RTV Silicone Rubber

    Highest durometer, highest inhibition resistance.

    *See Terms of Use Below

    Brand Silastic
    Application Type Mold-Making
    1 Part or 2 Part 2 Part
    Material Form Liquid
    Industry Production tooling
    Manufacturer Dow
    Chemistry Silicone rubber, Urethane foams
    Cure Method Base/Curing agent
    Cure Temperature (°C) 20 to 25, 25
    Cure Time (min) Fast, 1,440, 240 to 300
    Viscosity (cPs) 66,000, Pourable
    High Temperature Resistance (°C) Very high
    Other Resistance Inhibition
  • Technical Data for Dow Silastic M-2 RTV Silicone Rubber

    Overview
    • Application Type
    • 1 Part or 2 Part
      • 1 Part or 2 Part - 2 Part
      • Part A Name - Base
      • Part B Name - Curing Agent
    • Material Form
      • Liquid
    • Industry
      • Industrial - Prototype design, Prototyping
      • Tooling & Composites - Production tooling
      • Construction - Architectural, Architectural and furniture components
      • Furniture / Wood-Working - Furniture
      • Other - Artistic and renovation applications
    • Chemistry
    • Cure Method
      • 2-Part Cure - Base/Curing agent
    • Brand
      • Silastic
    Specifications
    Cure Specs
    Cure Temperature (°C) 20 to 25, 25
    Cure Time (min) Fast, 1,440, 240 to 300
    Viscosity (cPs) 66,000, Pourable Test Method
    Linear Shrinkage (%) 0.10 Test Method
    Work / Pot Time (min) 90
    Mix Ratio 10:1 (by volume), 100:10 (by weight)
    Bond Strength
    Tear Strength (piw) Good, 85 (ppi) Test Method
    Tensile Strength (psi) 700 Test Method
    Material Resistance
    High Temperature Resistance (°C) Very high
    Other Resistance Inhibition
    Hardness
    Shore A Hardness High, 59 Test Method
    Elongation (%) 2 Test Method
    Flexibility Flexible
    Other Properties
    Specific Gravity 1.290 Test Method
    Flash Point (°F) 212.0
    Business Information
    Shelf Life Details When stored at or below 32°C (90°F) in original unopened containers, Silastic M-2 RTV Silicone Rubber has a shelf life of 12 months from date of manufacture. Refer to product packaging for “Use By” date., Both base and curing agent can be sensitive to moisture and contamination. Ensure containers are tightly closed after use.
    Shelf Life Type from date of manufacture
    Shelf Life (mon) 12
  • Best Practices for Dow Silastic M-2 RTV Silicone Rubber

    *See Terms of Use Below

    1. Surface Preparation

      Certain contaminants found in moldmaking operations can prevent Silastic M-2 RTV Silicone Rubber from curing. Patterns to be molded should be thoroughly cleaned to remove grease, oil, and other surface contaminants. Care should also be taken to ensure that corners, crevices, and draws are free of dirt or particles of foreign matter. A light “blow over” with compressed air is advised when the pattern has convoluted draws or undercuts. Then, the original model or pattern should be placed in a light frame or cardboard, foil, wood, or other material. There should be approximately (0.95-cm) 3/8- inch clearance on all sides and over the top of the pattern. The pattern should be attached securely to the bottom of the frame so it does not float. A pattern release agent should then be wiped or sprayed on the pattern. Spreading a light coat of release agent on the sides and underside of the top of the frame will facilitate release.

      A good pattern release agent can be made by combining five percent petroleum jelly and 95 percent solvent. Combine the materials and let stand overnight – then shake by hand to provide a good mix.

    2. Application

      Pressure casting may be substituted with equal success.

      Pour the mixed base and curing agent onto the master, avoiding air entrapment.

    3. Mixing

      Weigh out 100 parts of Silastic M-2 RTV Silicone Rubber base and 10 parts of curing agent in a clean container. Mix until the curing agent is completely dispersed in the base and a uniform color is obtained.

    4. Deairing/Degassing

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

    5. Curing

      The catalyzed mixture will typically cure to a flexible rubber within four to five hours at room temperature, at which time the part can be demolded. Heat accelerating the cure is possible, but some physical property changes, such as increased durometer hardness, will occur.

      NOTE: Above room temperature, the working time for Silastic M-2 RTV Silicone Rubber is substantially decreased. Due to this decrease in working time, automatic dispensing equipment is recommended.

  • Comparable Materials for Dow Silastic M-2 RTV Silicone Rubber

    *See Terms of Use Below

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Linear Shrinkage Test Methods
Linear Shrinkage Test Method Temp
0.10 % Cured 24 hours at 25°C (77°F). 25°C
Viscosity Test Methods
Viscosity Test Method
66,000 cPs As Mixed – 100 Parts Base to 10 Parts Curing Agent by Weight
Pourable
Tear Strength Test Methods
Tear Strength Cure Time Cure Temperature Test Method
Good
85 (ppi) 1,440 min 25°C Die B, cured 24 hours at 77°F (25°C).
Tensile Strength Test Methods
Tensile Strength Cure Time Cure Temperature Test Method
700 psi 1,440 min 25°C Cured 24 hours at 77°F (25°C).
Elongation Test Methods
Elongation Test Method
2 % Cured 24 hours at 25°C (77°F).
Shore A Hardness Test Methods
Shore A Hardness Shore Hardness Test Method Hardness Temperature
High
59 Hardness/Durometer Test Method 25°C
Specific Gravity Test Methods
Specific Gravity Test Method
1.290 100 Parts Base to 10 Parts Curing Agent by Weight