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Thermal cracking. In thermal cracking, high temperatures (typically in the range of 450Â°C to 750Â°C) and pressures (up to about 70 atmospheres) are used to break the large hydrocarbons into smaller ones. Thermal cracking gives mixtures of products containing high proportions of hydrocarbons with double bonds - alkenes.
Steps in environmental stress cracking ESC is a phenomenon in which a particularplastic resin is cracked through contact with a spe-cific chemical agent while under stress. The syner-gistic effects of the chemical agent and mechanicalstresses result in cracking.