$ELASTOSIL<sup>®</sup> RT 402

ELASTOSIL® RT 402 is a pourable, condensation-curing, two-component silicone rubber that vulcanizes at room temperature.


Main application: Making pads for pad printing, antistatic behaviour.


  • Very good flowability and self-deaeration
  • Very low hardness (Shore A approx. 11)
  • Good tear strength
  • Excellent transfer characteristics for printing inks
  • Antistatic finish

Specific features of ELASTOSIL® RT 402

  • Antistatic
  • Condensation-curing
  • Two-component


All the information provided is in accordance with the present state of our knowledge. Nonetheless, we disclaim any warranty or liability whatsoever and reserve the right, at any time, to effect technical alterations. The information provided, as well as the product's fitness for an intended application, should be checked by the buyer in preliminary trials. Contractual terms and conditions always take precedence. This disclaimer of warranty and liability also applies particularly in foreign countries with respect to third parties' rights.

ELASTOSIL® RT 402 has been particularly designed as a base material for making printing pads.

A special feature of ELASTOSIL® RT 402 is that it contains an antistatic additive for fast dissipation of static charge that has built up on the pad surface. This feature is particularly important for printing on highly sensitive electronic parts such as CPUs.

ELASTOSIL® RT 402 is exclusively processed with 3 wt % Catalyst T 12, based on the total amount of the mass (rubber base or base plus silicone fluid).

To ensure homogeneity of the material, the components must be stirred thoroughly before they are removed from or processed in their containers, in order to uniformly disperse any fillers that might have settled during storage. It is advisable to thoroughly mix rubber base and fluid before the catalyst is incorporated.

When diluting ELASTOSIL® RT 402 with silicone fluid, it is advisable to thoroughly mix rubber base and fluid before the catalyst is incorporated.

Comprehensive instructions are given in our leaflet "ELASTOSIL® - PROCESSING RTV-2 SILICONE RUBBERS".

Dilution charts:
The following table shows the hardness of ELASTOSIL® RT 402 as a function of the added amount of Wacker Silicone Fluid AK 35 for Durometer Types Shore A and Shore 00.


The 'Best use before end' date of each batch is shown on the product label.

Storage beyond the date specified on the label does not necessarily mean that the product is no longer usable. In this case however, the properties required for the intended use must be checked for quality assurance reasons.

Sales and support

Wacker Chemical Corporation
3301 Sutton Road
Adrian, MI 49221-9397
United States
+1  888  922-5374 (Phone)

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More products

Products Technical data
Viscosity, dynamic Tear strength Hardness Shore A Tensile strength Elongation at break
ELASTOSIL® M 4400 30000 mPa·s[1] 30000 mPa·s[1] > 3 N/mm[4] > 3 N/mm[4] 23[5] 23[5] 2 N/mm²[6] 2 N/mm²[6] 250 %[7] 250 %[7]
ELASTOSIL® RT 402 - - > 3 N/mm[4] > 3 N/mm[4] 11[5] 11[5] 2 N/mm²[6] 2 N/mm²[6] 350 %[7] 350 %[7]
ELASTOSIL® RT 620 A/B 7000 mPa·s[2] 7000 mPa·s[2] ≥ 12 N/mm[4] ≥ 12 N/mm[4] 17[5] 17[5] 5 N/mm²[6] 5 N/mm²[6] 900 %[7] 900 %[7]
ELASTOSIL® RT 623 A/B 15000 mPa·s[3] 15000 mPa·s[3] > 30 N/mm[4] > 30 N/mm[4] 31[5] 31[5] 7.5 N/mm²[6] 7.5 N/mm²[6] 700 %[7] 700 %[7]
ELASTOSIL® RT 629 A/B 14000 mPa·s[3] 14000 mPa·s[3] 25 N/mm[4] 25 N/mm[4] 31[5] 31[5] 6 N/mm²[6] 6 N/mm²[6] 500 %[7] 500 %[7]
[1] Viscosity, dynamic after stirring | 23 °C | DIN EN ISO 3219,  [2] Viscosity, dynamic | 23 °C | ISO 3219,  [3] Viscosity, dynamic after stirring | 23 °C | ISO 3219,  [4] Tear strength | ASTM D 624 B,  [5] Hardness Shore A | ISO 868,  [6] Tensile strength | ISO 37,  [7] Elongation at break | ISO 37 


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