BS ISO 2302:2020 pdf free.Isobutene-isoprene rubber (IIR)一Evaluation procedure. BS ISO 2302 For laboratory internal mixers having a nominal capacity of 65 cm3 to about 2 000 cm3, the batch mass shall be equal to the nominal mixer capacity, in cubic centimetres, multiplied by the density of the compound. For each batch mixed, the laboratory internal mixer conditions shall be the...