FIELD: polymer production. SUBSTANCE: when preparing extrusion polystyrene, to control pore size, blowing agent - ground vesicular perlite with 3.5-7.0 wt % of saturated C5-hydrocarbons is used in quantity 0.7- 1.5 wt parts per 100 wt parts of polystyrene granules. EFFECT: shaped polystyrene foam products produced with small-cell heterogeneous structure, high dimensional stability, and stable physico-mechanical and thermophysical characteristics. 1 tbl
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