The word “strained” means “sieving” or “filtering”.
In connection with rubber compounds, strained is used when, after the actual mixing process, in a further step in an extruder the compounds are pressed through a very fine-meshed sieve. In many cases, mesh widths of less than 0.5 mm are used. Impurities are retained in the sieve and removed from the compound batch.
Strained rubber compounds are used especially for products in medical technology, the semiconductor industry, but also for the high-end automotive sector.
On the basis of computed tomographic analyses, it can be shown that the finished parts made from strained compounds have a very homogeneous elastomer structure without disturbing foreign inclusions.