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Elastosil RT 623                                                 



Elastosil RT 623 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.  Elastosil RT 623 A/B is subject to special quality assurance measures including tests for absence of filler and pigment particles larger than 100 m.


  •  cures to a nominal 35 duro Shore A hardness
  •  very high tear resistance
  •  exhibits long term stability of vulcanized mechanical properties
  •  fast non-shrink cure at room temperature
  •  exhibits very good flow

Basic Typical Physical Properties

RubberWorks RTV Data Sheet

Elastosil RT 623 A/B

Property Test Procedure Component A   Component B
Appearance   White   Reddish Brown
Density, 23 C, g/cm3 DIN 52 479 A 1.14   1.02
Viscosity, 23 C, cPs Brookfield 25,000   800
      Mixed 9:1 Ratio  
Hardness, Shore A DIN 53 505   35  
Tensile Strength, psi DIN 53 504 S3   1014  
Elongation at Break, % DIN 53 504 S3   550  
Tear Resistance, ppi ASTM D624, B   160  
Linear Shrinkage, %     < 0.1  
Viscosity, 23 C, cPs Brookfield   20,000  
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 623 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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Send mail to Info@RubberWorksInc.com with questions or comments.  RubberWorks Inc is your Canadian source!
Last modified: December 28, 2010

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