Process for the manufacturing a cured expanded non-cracking dimensionally stable urea formaldehyde product

摘要

A strong, expanded moulded panel or board, having a specific gravity between 0.2 and 0.8, is produced by heating dry urea formaldehyde resin containing 4% to 8% volatile materials in a mould at between 130 DEG and 160 DEG C under light restraining pressure between 30 and 300 psi which permits moderate expansion of the resin owing to the gasification of the volatile materials.