Here is a basic comparison of typical physical properties for the most commonly used Wacker grades of condensation cured Elastosil moldmaking materials.

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Elastosil Data Comparison

Condensation Cured RTV Silicone Compounds

M 4470   M 4511 M 4512 M 4514 M 4541
Consistency Pourable   Pourable Pourable Pourable Pourable
Appearance Reddish Brown   White White White White
Catalyst(s) T37 or T40   T121 or T126 T121 or T126 T121 or T126 T121 or T126
Property Test Procedure .. Call Us for Data on Pot Life - Cure/Demold Times - Catalyst Loadings
Density, 23 C, g/cm3 DIN 52 479 A 1.44   1.22 1.19 1.25 1.16
Viscosity, 23 C, cPs Brookfield 10,000   20,000 25,000 25,000 25,000
Hardness, Shore A DIN 53 505 60   12 20 25 30
Tensile Strength, psi DIN 53 504 S3 650   510 510 650 725
Elongation at Break, % DIN 53 504 S3 120   600 500 450 400
Tear Resistance, ppi ASTM D624, B > 23   > 105 > 140 > 145 > 170
Linear Shrinkage, % 0.8   0.4 0.4 0.4 0.5
Catalyst Choice and Loading Determine many characteristics of these materialsAsk us for the complete Wacker Data Sheet for any Elastosil compound for details on Viscosity, Pot Life and Cure Time.  Other grades of Elastosil RTV materials are available - call us for details if you don't see what you need.

Just Announced ... 4 New Elastosil compounds added to the line-up of tin-cure materials

M 3502US is a thixotropic version of M 4514 ... same hardness but comes in a non-sag paste

M 3504US is a thixotropic version of M 4541 ... same hardness but comes in a non-sag paste

 M 3502US and M 3504US are both suitable for use on vertical surfaces

M 4509US is a 10 durometer, high elongation and tear strength, translucent compound

M 4510US is a 14 durometer, high elongation and tear strength, translucent compound

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Last modified: December 28, 2010

Elastosil, Semicosil, and Powersil are registered trademarks of Wacker Chemical.