ELASTOSIL® R plus 4305/70 US
ELASTOSIL® R plus 4305/70 US HCR silicone rubbers are addition-curing, two part compounds (batch grades). The vulcanizates show excellent transparancy and good to very good mechanical properties. Properly postcured vulcanizates of ELASTOSIL® R plus 4305/70 US comply with BfR and FDA food contact regulations. The material also passes USP XXIII Class VI.
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® R plus 4305/70 US is intended for fabrication of extruded articles that afford high transparency and very good tear resistance values.
ELASTOSIL® R plus 4305/70 US may not be cured with peroxides, only with the catalyst batch ELASTOSIL® AUX PT1.
ELASTOSIL® R plus 4305/70 US and Curing Agent PT 1 are mixed homogeneously on a roll mill in a ratio of 100 : 1.5. Care must be taken to keep the mill and compound as cool as possible during mixing.
The temperature of the rubber should not exceed 35°C or risk partial curing and reduced pot life.
Crosslinking begins when Curing Agent PT 1 has been added. The rate and degree of crosslinking depends on the storage time and temperature.
At 23°C, the mixture has a pot life of about 24 hours. This can be extended by storing the catalyzed mixture at a lower temperature.
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