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Description for Dow Silastic V RTV Silicone Rubber
High tear strength, medium durometer, suited for architectural and prototype design.Brand Silastic Chemical Resistance Excellent Application Type Mold-Making 1 Part or 2 Part 2-Part Material Form Liquid Substrate Concrete, Porous Industry Architectural Manufacturer Dow Chemistry Silicone rubber Application Method Spatula Cure Method Base/Cruing agent Cure Temperature (°C) 23, 20 to 25 Cure Time (min) 1,440, 360 to 480 Viscosity (cPs) Medium, Thixotropic, 19,000, Non-flowable, Pourable Color Purple High Temperature Resistance (°C) 200 -
Technical Data for Dow Silastic V RTV Silicone Rubber
Overview
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Chemical Resistance
- Chemical Resistance - Excellent
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Application Type
- Casting / Moldmaking - Mold-Making
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1 Part or 2 Part
- 2-Part
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Material Form
- Liquid
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Substrate
- Concrete
- Porous Substrates - Porous
- Other - Plaster
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Industry
- Industrial - Prototyping
- Architectural
- Furniture / Wood-Working - Furniture
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Chemistry
- Silicone - Silicone rubber
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Application Method
- Brush
- Spatula/Trowel - Spatula
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Cure Method
- 2-Part Cure - Base/Cruing agent
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Color
- Purple
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Brand
- Silastic
Specifications
Cure Specs
Cure Temperature (°C) 23, 20 to 25 Cure Time (min) 1,440, 360 to 480 Viscosity (cPs) Medium, Thixotropic, 19,000, Non-flowable, Pourable Test Method Linear Shrinkage (%) <0.10 Test Method Work / Pot Time (min) 60 to 90 Test Method Thixotropic Thixotropic Mix Ratio 10:1 (by volume), 100:10 (by weight) Bond Strength
General Bond Strength (psi) High Tear Strength (piw) 182 (ppi), 32 (kN/m), High, Tear Resistance Test Method Tensile Strength (psi) 913, 6.3 (Mpa) Test Method Material Resistance
High Temperature Resistance (°C) 200 Hardness
Shore A Hardness 38 to 40, 38 Test Method Elongation (%) 500, High Test Method Flexibility Flexible Other Properties
Specific Gravity 1.35 (gm/cc) Flash Point (°F) 140.0 Business Information
Shelf Life Details When stored at or below 25°C (77°F) in the original unopened containers, SILASTIC V RTV Base and SILASTIC V RTV Curing Agent have a usable life of 12 months from the date of production. SILASTIC V RTV Base and SILASTIC V 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 dental, Human skin molding -
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Best Practices for Dow Silastic V RTV Silicone Rubber
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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 case, it is advisable to check before casting that no discoloration or adhesion occurs between the product and the original or mold frame.
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Mixing
Weigh 100 parts of SILASTIC V RTV Base and 10 parts of SILASTIC V RTV Curing Agent (see handling precautions) in a clean container, then mix together until the curing agent is completely disperse 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.
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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 minimized 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 laver 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 ration MUST be between 100:9.5 and 100:10.5.
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Linear Shrinkage Test Methods
Linear Shrinkage | Test Method |
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<0.10 % | After 7 days |
Viscosity Test Methods
Viscosity | Test Method |
---|---|
Medium | |
Thixotropic | |
19,000 cPs | Mixture (100:10 by weight) |
Non-flowable | |
Pourable |
Work / Pot Time Test Methods
Work / Pot Time | Temperature |
---|---|
60 to 90 min | 23°C |
Tear Strength Test Methods
Tear Strength | Cure Time | Cure Temperature | Test Method |
---|---|---|---|
182 (ppi) | 1,440 min | 23°C | Die B |
32 (kN/m) | 1,440 min | 23°C | Die B |
High | |||
Tear Resistance |
Tensile Strength Test Methods
Tensile Strength | Cure Time | Cure Temperature |
---|---|---|
913 psi | 1,440 min | 23°C |
6.3 (Mpa) | 1,440 min | 23°C |
Elongation Test Methods
Elongation | Test Method |
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500 % | Cured for 24 hours at 23°C (73.4°F) |
High | Elongation Test Method |
Shore A Hardness Test Methods
Shore A Hardness | Shore Hardness Test Method | Hardness Temperature |
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38 to 40 | Hardness/Durometer Test Method | 23°C |
38 | Cured for 24 hours at 23°C (73.4°F) |