Dow Silastic V RTV Silicone Rubber

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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

Best Practices for Dow Silastic V RTV Silicone Rubber

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Technical Data for Dow Silastic V RTV Silicone Rubber

*See Terms of Use Below

Overview

Chemical Resistance
- Chemical Resistance - Excellent
Application Type
- Casting / Moldmaking - Mold-Making
1 Part or 2 Part
- 2-Part
Material Form
- Liquid
Substrate
- Concrete
- Porous Substrates - Porous
- Other - Plaster
Industry
- Industrial - Prototyping
- Architectural
- Furniture / Wood-Working - Furniture
Chemistry
- Silicone - Silicone rubber
Application Method
- Brush
- Spatula/Trowel - Spatula
Cure Method
- 2-Part Cure - Base/Cruing agent
Color
- Purple
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

Best Practices for Dow Silastic V 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 case, it is advisable to check before casting that no discoloration or adhesion occurs between the product and the original or mold frame.
2. 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.
3. 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.
Comparable Materials for Dow Silastic V RTV Silicone Rubber

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Spec Engine^® Results
- Silastic S-2 RTV Silicone Rubber(Dow)
  High tear, lowest durometer and mixed viscosity, suited for reproduction of reconstituted stone.
- MM940 w/ MM Cat R5NT(CHT)
  A two-component room temperature condensation curing silicone compound. The cured product is an exceptionally flexible rubber with very high mechanical properties and good shelf life stability.
- MM940 w/ MM Cat L8W(CHT)
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