ELASTOSIL® R plus 4305/60 S

High Consistency Silicone Rubber (HCR)
ELASTOSIL® R plus 4305/60 S is an addition-curing, two-component high consistency silicone rubber for the manufacture
of extruded articles. Cured articles are of excellent transparency and exhibit good to very good mechanical properties.

Properties
ELASTOSIL® R plus 4305/60 S is a fast curing silicone rubber exhibiting good to very good mechanical properties. Thanks
to addition cure, the vulcanization reaction is significantly faster compared to peroxide curing materials. No peroxide
decomposition products are formed during vulcanization.
At service temperatures above approx. 180 °C the addition of heat stabilizers is recommended. Further information about
an improvement of the heat stability by use of specific ELASTOSIL® AUX Heat Stabilizers can be obtained from the
Technical Information Sheet “ELASTOSIL® AUX Stabilizers H” or the latest edition of our brochures.

Specific features
• Addition Curing
• Food-contact
• Low compression set
• Two-component

Technical data

Applications

• Baby Care
• Dairy & Food Applications
• Profiles & Tubings
• Sanitary

Application details

ELASTOSIL® R plus 4305/60 S is suited for the manufacture of extruded articles. Properly cured and post-cured vulcanizates of ELASTOSIL® R plus 4305/60 S can be used for food contact applications and are suitable for use under the Recommendation “XV. Silicones” of the BfR and FDA 21 CFR §177.2600 “Rubber Articles Intended for Repeated Use” considering any given limitations on extractable and volatile substances. A statement regarding biocompatibility according to USP<88> class VI and selected tests of ISO 10993 is available on request.

Processing

ELASTOSIL® R plus 4305 series may not be cured with peroxides but only with the platinum catalyst batch ELASTOSIL®
AUX Batch PT 1. ELASTOSIL® R plus 4305/60 and ELASTOSIL® AUX Batch PT 1 are mixed homogeneously on a roll mill
in a ratio of 100:1.5. A higher catalyst dosage results in a faster curing but a reduced pot life. Care must be taken to keep
the compound cool during mixing. A homogeneous incorporation is a must, but the temperature of the rubber should not
exceed 30 °C, otherwise there is a risk of scorch.
The cross linking reaction starts as soon as ELASTOSIL® AUX Batch PT 1 has been added. The rate and degree of
crosslinking is dependent on storage time and temperature. At 23 °C the pot life is approximately 24 h. This can be
extended by storing the catalyzed mixture at lower temperature.
For detailed information please refer to the latest edition of our brochure “SOLID AND LIQUID SILICONE RUBBER
MATERIAL AND PROCESSING GUIDELINES”.

Packaging and storage

Packaging
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.
Storage
Once opened, cardboard boxes should always be resealed after use to prevent the platinum catalyst from being poisoned
by amines, sulphur or phosphorus compounds. 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.

Safety notes

Comprehensive instructions are given in the corresponding Material Safety Data Sheets. They are available on request from
WACKER subsidiaries or may be printed via WACKER web site http://www.wacker.com.