FIELD: process engineering.
SUBSTANCE: invention relates to metallurgy. Composition comprises solid hydrocarbon in amount of 0.1-80 wt %, and/or wax in amount of 0.1-80 wt %, and/or polymer with fusion temperature of up to 300°C in amount of 0.05-30 wt %, and phthalic acid in amount of 0.1-99.0 wt % as filler.
EFFECT: phthalic acid increase harness, heat and crack resistance, decrease ash content and linear shrinkage of investment patterns.
2 tbl
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