Dow Silastic J RTV Silicone Rubber

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Description for Dow Silastic J RTV Silicone Rubber

Good tear resistance, high durometer.

Brand	Silastic
Chemical Resistance	Excellent
Application Type	Mold-Making
1 Part or 2 Part	2-Part
Material Form	Liquid
Manufacturer	Dow
Chemistry	Silicone rubber
Cure Method	Base/curing agent, Heat
Cure Temperature (°C)	20 to 25, 23, 23
Cure Time (min)	1,080 to 1,440, 1,440
Viscosity (cPs)	85000 (mPa.s), Pourable
High Temperature Resistance (°C)	High, 200
Density (g/cm³)	0.001

Best Practices for Dow Silastic J RTV Silicone Rubber

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Technical Data for Dow Silastic J 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
Chemistry
- Silicone - Silicone rubber
Cure Method
- Heat
- 2-Part Cure - Base/curing agent
Brand
- Silastic

Specifications

Cure Specs

Cure Temperature (°C)	20 to 25, 23, 23	Test Method
Cure Time (min)	1,080 to 1,440, 1,440	Test Method
Viscosity (cPs)	85000 (mPa.s), Pourable	Test Method
Linear Shrinkage (%)	0.10	Test Method
Work / Pot Time (min)	120 to 80	Test Method
Mix Ratio	10:1 (by volume), 100:10 (by weight)

Bond Strength

General Bond Strength (psi)	High
Tear Strength (piw)	15 (kN/m)	Test Method
Tensile Strength (psi)	5.5 (Mpa)	Test Method

Material Resistance

High Temperature Resistance (°C)	High, 200

Hardness

Shore A Hardness	56, High	Test Method
Elongation (%)	3	Test Method
Flexibility	Flexible

Other Properties

Flash Point (°F)	213.8
Density (g/cm³)	0.001	Test Method

Business Information

Shelf Life Details	When stored at or below 43°C (109.4°F) in the original unopened containers, SILASTIC J Base and SILASTIC J Curing Agent have a usable life of 12 months from the date of production.
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 J 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 PTFE.
2. Application
  
  Pour the mixed base and curing agent as soon as possible onto the original, avoiding air entrapment.
3. Mixing
  
  Thoroughly stir SILASTIC J Curing Agent before use. Weigh 100 parts of SILASTIC J Base and 10 parts of SILASTIC J 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 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.
  
  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 layer has begun to cure. Mix a further quantity of base and curing agent and proceed as follows to produce a final mold.
5. Curing
  
  The catalyzed material will cure to a flexible rubber within 18-24 hours at room temperature (2224° C/ 71.675.2° F) 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. As a guide, a 5mm section of SILASTIC J will heat cure in 30 minutes at 65°C (149°F) or in 12 minutes at 100°C (212°F) once the material has reached this temperature.
Comparable Materials for Dow Silastic J RTV Silicone Rubber

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