Dow Silastic M-2 RTV Silicone Rubber

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Description for Dow Silastic M-2 RTV Silicone Rubber

Highest durometer, highest inhibition resistance.

Brand	Silastic
Application Type	Mold-Making
1 Part or 2 Part	2-Part
Material Form	Liquid
Industry	Production tooling, Architectural, Architectural components
Manufacturer	Dow
Chemistry	Silicone rubber, Urethane foams
Cure Method	Base/Curing agent
Cure Temperature (°C)	20 to 25, 25
Cure Time (min)	Fast, 1,440, 240 to 300
Viscosity (cPs)	66,000, Pourable
High Temperature Resistance (°C)	Very high
Other Resistance	Inhibition

Best Practices for Dow Silastic M-2 RTV Silicone Rubber

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Technical Data for Dow Silastic M-2 RTV Silicone Rubber

*See Terms of Use Below

Overview

Application Type
- Casting / Moldmaking - Mold-Making
1 Part or 2 Part
- 2-Part
Material Form
- Liquid
Industry
- Industrial - Prototype design, Prototyping
- Tooling & Composites - Production tooling
- Architectural - Architectural components
- Furniture / Wood-Working - Furniture, Furniture components
- Other - Artistic and renovation applications
Chemistry
- Polyurethane - Urethane foams
- Silicone - Silicone rubber
Cure Method
- 2-Part Cure - Base/Curing agent
Brand
- Silastic

Specifications

Cure Specs

Cure Temperature (°C)	20 to 25, 25
Cure Time (min)	Fast, 1,440, 240 to 300
Viscosity (cPs)	66,000, Pourable	Test Method
Linear Shrinkage (%)	0.10	Test Method
Work / Pot Time (min)	90
Mix Ratio	10:1 (by volume), 100:10 (by weight)

Bond Strength

Tear Strength (piw)	Good, 85 (ppi)	Test Method
Tensile Strength (psi)	700	Test Method

Material Resistance

High Temperature Resistance (°C)	Very high
Other Resistance	Inhibition

Hardness

Shore A Hardness	High, 59	Test Method
Elongation (%)	2	Test Method
Flexibility	Flexible

Other Properties

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

Business Information

Shelf Life Details	When stored at or below 32°C (90°F) in original unopened containers, Silastic M-2 RTV Silicone Rubber has a shelf life of 12 months from date of manufacture. Refer to product packaging for “Use By” date., Both base and curing agent can be sensitive to moisture and contamination. Ensure containers are tightly closed after use.
Shelf Life Type	from date of manufacture
Shelf Life (mon)	12

Best Practices for Dow Silastic M-2 RTV Silicone Rubber

*See Terms of Use Below
1. Surface Preparation
  
  Certain contaminants found in moldmaking operations can prevent Silastic M-2 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 or cardboard, foil, wood, or other material. There should be approximately (0.95-cm) 3/8- inch clearance on all sides and over the top of the pattern. The pattern 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 five percent petroleum jelly and 95 percent solvent. Combine the materials and let stand overnight – then shake by hand to provide a good mix.
2. Application
  
  Pressure casting may be substituted with equal success.
  
  Pour the mixed base and curing agent onto the master, avoiding air entrapment.
3. Mixing
  
  Weigh out 100 parts of Silastic M-2 RTV Silicone Rubber base and 10 parts of curing agent in a clean container. Mix until the curing agent is completely dispersed in the base and a uniform color is obtained.
4. Deairing/Degassing
  
  Entrapped air should be removed in a vacuum chamber, allowing the mixture to completely expand and then collapse. After an additional three minutes of vacuum, the mix should be inspected and can be used if free of air bubbles. A volume increase of three to four times will occur on vacuum deairing of the mixture, so a suitably large container should be chosen.
5. Curing
  
  The catalyzed mixture will typically cure to a flexible rubber within four to five hours at room temperature, at which time the part can be demolded. Heat accelerating the cure is possible, but some physical property changes, such as increased durometer hardness, will occur.
  
  NOTE: Above room temperature, the working time for Silastic M-2 RTV Silicone Rubber is substantially decreased. Due to this decrease in working time, automatic dispensing equipment is recommended.
Comparable Materials for Dow Silastic M-2 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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