Abstract: Modified graphite (MG) was prepared by Hummers method, which was introduced into PVA modified ureaformaldehyde resin (MUF) by insitu intercalation polymerization. The obtained compound resin MGMUF was used as coating of preexpanded polystyrene (EPS) beads. The coated beads were thermally pressed into templates, whose flame retardantcy, thermal insulation properties, and mechanical strength were characterized. When MG in MGMUF was 20 % and the coat ratio was 3：1, the limiting oxygen index of retardant templates reached 30.5 %, the horizontal burning grade of the template was HF-1.

Key words: epolystyrene, thermal insulating material, fire-retardant material, modified urea-formaldehyde resin