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Elastosil RT 621                                                 



Elastosil RT 621 A/B is an RTV-2 silicone rubber well suited to Pad Printing applications.  It's a pourable, addition-curing, low durometer silicone that can be vulcanized at room temperature, or at elevated temperatures to increase the rate of cure.  Hardness can be reduced even further by adding Wacker AK 35 silicone fluid.  It has high system reactivity for fast demolding even when large amounts of silicone fluid have been added.


  •  cures to a nominal 25 duro Shore A hardness
  •  very high tear resistance
  •  fast non-shrink cure at room temperature
  •  exhibits very good flow

Basic Typical Physical Properties

RubberWorks RTV Data Sheet

Elastosil RT 621 A/B

Property Test Procedure Component A   Component B
Appearance   White   Reddish Brown
Density, 23 C, g/cm3 DIN 52 479 A 1.13   1.01
Viscosity, 23 C, cPs Brookfield 25,000   800
      Mixed 9:1 Ratio  
Hardness, Shore A DIN 53 505   25  
Tensile Strength, psi DIN 53 504 S3   1015  
Elongation at Break, % DIN 53 504 S3   750  
Tear Resistance, ppi ASTM D624, B   >170  
Linear Shrinkage, %     < 0.1  
Viscosity, 23 C, cPs Brookfield   15,000  
Appearance     Reddish Brown  
Typical Values Shown are not intended for use in the preparation of specifications

Contact RubberWorks for the complete Wacker Data Sheet which describes this Elastosil product

RT 621 is supplied in kits consisting of A and B Components - Pail Kit Sizes Available: 30 kg

            Call RubberWorks for the detailed Wacker Elastosil Data Sheet


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Last modified: December 28, 2010

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