Dow Silastic S-2 RTV Silicone Rubber

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

    High tear, lowest durometer and mixed viscosity, suited for reproduction of reconstituted stone.

    *See Terms of Use Below

    Brand Silastic
    Application Type Mold-Making
    1 Part or 2 Part 2 Part
    Material Form Liquid
    Substrate Polyurethane, Concrete, Porous
    Manufacturer Dow
    Chemistry Silicone rubber
    Application Method Spatula
    Cure Method Base/curing agent
    Cure Temperature (°C) 20 to 25, 23, 20 to 25
    Cure Time (min) Fast, 1,440, 360 to 480
    Viscosity (cPs) Low, Thixotropic, 9,000, Mixed, Non-flowable, Pourable
    Chemical Resistance Excellent
    High Temperature Resistance (°C) 200
  • Technical Data for Dow Silastic S-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
    • Substrate
    • Chemistry
    • Application Method
      • Brush
      • Spatula/Trowel - Spatula
    • Cure Method
      • 2-Part Cure - Base/curing agent
    • Brand
      • Silastic
    Specifications
    Cure Specs
    Cure Temperature (°C) 20 to 25, 23, 20 to 25 Test Method
    Cure Time (min) Fast, 1,440, 360 to 480 Test Method
    Viscosity (cPs) Low, Thixotropic, 9,000, Mixed, Non-flowable, Pourable Test Method
    Linear Shrinkage (%) <0.10 Test Method
    Work / Pot Time (min) 60 Test Method
    Thixotropic Thixotropic
    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), Tear Resistance Test Method
    Tensile Strength (psi) 913, 6.3 (Mpa) Test Method
    Material Resistance
    Chemical Resistance Excellent
    High Temperature Resistance (°C) 200
    Hardness
    Shore A Hardness 20, Medium Test Method
    Elongation (%) 6 Test Method
    Flexibility Flexible
    Other Properties
    Specific Gravity 1.130 Test Method
    Flash Point (°F) 145.4
    Business Information
    Shelf Life Details When stored at or below 25°C (77°F) in the original unopened containers, SILASTIC S-2 RTV Base and SILASTIC S-2 RTV Curing Agent have a usable life of 12 months from the date of production., SILASTIC S-2 RTV Base and SILASTIC S-2 RTV Curing Agent can be sensitive to moisture and contamination. Ensure that containers are tightly 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 S-2 RTV Silicone Rubber

    *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 soap solution.

      In all cases, it is advisable to check before casting that no discoloration or adhesion occurs between the product and the original or mold frame.

    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 S-2 RTV Base and 10 parts of SILASTIC S-2 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 2-3 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 minimised 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. The base/curing agent ratio MUST be between 100:9.5 and 100:10.5.

    5. Curing

      The catalyzed material will cure to a flexible rubber within 6-8 hours at room temperature (22-24 or 71.6-75.2) and the mold can then 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 S-2 RTV Silicone Rubber

    *See Terms of Use Below

    Spec Engine® Results

Questions about this material?

Dow - Silastic S-2 RTV Silicone Rubber

Get personal assistance with your specific application needs.

Your Profile Edit

Popular Articles

Electrically Conductive Adhesives

Read Article

6 objects held together by adhesives you probably can't live without

Read Article

Infographic: ENSURING A STRONG BOND - 6 Basic Methods of Surface Preparation

Read Article

Testing the effectiveness of surface treatments

Read Article

Sponsored Articles

Unique Advantages of Contact Adhesives

Read Article

Using LOCTITE® 454™ is a Valid Option for Engineers Working with a Wide Variety of Materials

Read Article

Sylgard 184 by DOW is the Top Choice for a Transparent, Silicone Encapsulant. Read Why:

Read Article

Case Study: Creating reliable, corrosion-free bonds with LORD® 406 acrylic adhesive

Read Article
Information provided by Gluespec

Why Register?

  • View Technical Details
  • View Test Methods
  • View Key Specifications
  • View Similar Materials
  • Save your Project Searches

Already registered? Sign in.

Questions? Learn more about Gluespec

Gluespec Poll

What level of expertise do you have in specialty chemicals like adhesives, sealants, conformal coatings, etc.?
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)
20 to 25°C
Cure Time Test Methods
Cure Time Test Method
Fast
1,440 min Cured for 24 hours at 23° C (73.4°F)
360 to 480 min
Linear Shrinkage Test Methods
Linear Shrinkage Test Method Temp
<0.10 % Cured for 24 hours at 23°C (73.4°F) 23°C
Viscosity Test Methods
Viscosity Test Method
Low
Thixotropic
9,000 cPs Mixture (100:10 by weight)
Mixed
Non-flowable
Pourable
Work / Pot Time Test Methods
Work / Pot Time Temperature
60 min 23°C
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
Tensile Strength Test Methods
Tensile Strength Cure Time Cure Temperature
913 psi 1,440 min 25°C
6.3 (Mpa) 1,440 min 25°C
Elongation Test Methods
Elongation Test Method
6 % Cured for 24 hours at 23°C (73.4°F)
Shore A Hardness Test Methods
Shore A Hardness Shore Hardness Test Method Hardness Temperature
20 Cured for 24 hours at 23°C (73.4°F) 23°C
Medium
Specific Gravity Test Methods
Specific Gravity Temperature Test Method
1.130 25°C Cured for 24 hours at 23°C (73.4°F)