Dow Silastic M RTV Silicone Rubber

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Description for Dow Silastic M RTV Silicone Rubber

Good tear resistance, highest durometer, good inhibition resistance.

Brand	Silastic
Application Type	Mold-Making
1 Part or 2 Part	2 Part
Material Form	Fluid
Substrate	Casting plastics
Manufacturer	Dow
Chemistry	Silicone rubber
Cure Method	Heat, Base/Curing Agent
Cure Temperature (°C)	25, 25, 52, 65, 93, 121, 149
Cure Time (min)	960, 960, 60, 30, 15, 7, 5.00
Viscosity (cPs)	90,000, Pourable
Color	Regal Blue
Other Resistance	Inhibition
Cut Resistance	Cut-growth

Best Practices for Dow Silastic M RTV Silicone Rubber

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Technical Data for Dow Silastic M RTV Silicone Rubber

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Overview

Application Type
- Casting / Moldmaking - Mold-Making
1 Part or 2 Part
- 1 Part or 2 Part - 2 Part
- Part A Name - Base
- Part B Name - Curing Agent
Material Form
- Liquid - Fluid
Substrate
- Plastic - Casting plastics
Industry
- Industrial - Prototyping, Urethane foams
- Construction - Architectural, Architectural and furniture components
- Furniture / Wood-Working - Furniture
Chemistry
- Silicone - Silicone rubber
Application Method
- Dispenser - Automatic mixing equipment
Cure Method
- Heat
- 2-Part Cure - Base/Curing Agent
Color
- Blue - Regal Blue
Brand
- Silastic

Specifications

Cure Specs

Cure Temperature (°C)	25, 25, 52, 65, 93, 121, 149	Test Method
Cure Time (min)	960, 960, 60, 30, 15, 7, 5.00	Test Method
Viscosity (cPs)	90,000, Pourable	Test Method
Set Time (min)	30	Test Method
Linear Shrinkage (%)	0.10	Test Method
Work / Pot Time (min)	90
Mix Ratio	10:1 (by volume), 10:1 (by weight)

Bond Strength

General Bond Strength (psi)	High
Tear Strength (piw)	90 (ppi), Tear Resistance	Test Method
Tensile Strength (psi)	650	Test Method

Material Resistance

Other Resistance	Inhibition

Hardness

Cut Resistance	Cut-growth
Shore A Hardness	59	Test Method
Elongation (%)	3	Test Method
Flexibility	Firm,Flexible

Other Properties

Specific Gravity	1.290	Test Method
Flash Point (°F)	212.0

Business Information

Shelf Life Details	Silastic M RTV Silicone Rubber base and curing agent should be stored in closed containers at or below room temperature. The materials have a shelf life of 12 months from date of manufacture. Refer to product packaging for “Use By” date.
Shelf Life Type	from date of manufacture
Shelf Life (mon)	12

Best Practices for Dow Silastic M RTV Silicone Rubber

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1. Surface Preparation
  
  Certain contaminants used in moldmaking operations can prevent Silastic M 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 of cardboard, foil, wood or other material. There should be approximately 3/8-inch clearance on all sides and over the top of the pattern. The patterns 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 5 percent petroleum jelly and 95 percent solvent. Combine the materials and let stand overnight – then shake by hand to provide a good mix.
2. Mixing
  
  Automatic mixing equipment handles Silastic M RTV Silicone Rubber efficiently.
  
  Silastic M RTV Silicone Rubber curing agent should be mixed into the base material just before use (with either manual or mechanical stirring) in the amounts of 10 parts base to one part curing agent by weight. For the best curing results, use metal cans, clean glassware or unwaxed paper containers for mixing the base and curing agent.
3. Deairing/Degassing
  
  The product is deaired before shipment when packaged in drums.
  
  Inclusion of air during mixing may cause avoids in the finished mold. Entrapped air may be removed by applying a vacuum of 28 to 29 inches of mercury. Under such a vacuum, the material will expand to three to four times its original volume. As the froth collapses, the mixture will recede to its original volume. The vacuum should be held one or two minutes longer before releasing. Pressure casting may be substituted with equal success.
4. Curing
  
  The cure of Silastic M RTV Silicone Rubber occurs by a reaction between the base polymer and the curing agent. Polymerization requires 24 hours after the addition of the curing agent at room temperature. This material will not revert or depolymerize, even under conditions of elevated temperature and confinement. Vulcanization can be accelerated by heating the catalyzed material. However, this will increase the shrinkage from nil to 0.3 percent. A part 1/4-inch thick will set up within 30 minutes if the temperature is maintained at 150°F (65°C). The rate at which thicker sections will set up depends on the size and shape of the piece.
  
  See Vendor Technical Data Sheet for more info.
Comparable Materials for Dow Silastic M RTV Silicone Rubber

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Spec Engine^® Results
- RTV-4130-J Kit(Dow)
  • Outstanding release properties • High durometer hardness • Very low shrinkage and good dimensional stability • Good cut-growth resistance • Can be used for high temperature casting applications • Room temperature cure within 24 hours • Heat-accelerable cure
- Silastic RTV-4136-M(Dow)
  High durometer, medium tear resistance, silicone mold-making rubber for prototyping, architectural and furniture component applications.
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