ELASTOSIL® R 755/40 OH is a low-viscosity peroxide curing silicone rubber for manufacturing silicone rubber based spin casting discs.


  •  extremely high network density
  •  excellent resistance against liquid alloys in spincasting applications
  •  accepts high amounts of inactive filler

Specific features of ELASTOSIL® R 755/40 OH

  • Low compression set

The requirements of the spin casting disc largely depend on different model shapes. Casting models with deep undercuts may require blends of ELASTOSIL® R 755/40, softer or higher tear grades alternative with ELASTOSIL® EL AUX HND Batch. Thus it is necessary to prepare the best suitable disc quality for each application. ELASTOSIL® R 755/40 has been developed specifically for a high load of fillers for preparing compounds for spin-casting discs.

Further information you can get in our technical leaflet "Manufacturing Silicone Rubber based Spin Casting Discs". 

ELASTOSIL® R 755/40 OH is a silicone rubber base for spin casting discs. Usually ELASTOSIL® R 755/40 OH is mixed with 80 – 100 parts ground quartz and 1.5 parts ELASTOSIL® AUX crosslinker C1 (Dicumylperoxide).


Ageing properties (non-post-cured)

100.0 parts           R 755/40

80.0 parts             Quartz


Hardness ± 5    Initial value             65

                          30 min, 350 °C       53

                          60 min, 350 °C       51

                         180 min, 350 °C      62

These figures are intended as a guide and should not be used in preparing specifications.



For detailed information please refer to the latest edition of our brochure "SOLID AND LIQUID SILICONE RUBBER - MATERIAL AND PROCESSING GUIDELINES".


This product is available in 20 kg and 540 kg cardboard packaging.

Special delivery forms are possible but depend on several technical and commercial aspects. Please contact your local sales manager in such cases.


Please store the cardboard boxes in a dry and cool place. Already opened boxes should be closed again to avoid any contamination.

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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