METHOD OF MANUFACTURING HIGH-TEMPERATURE DIELECTRIC GLASS FIBER PLASTIC Russian patent published in 2001 - IPC

FIELD: insulation materials. SUBSTANCE: method includes impregnation of glass cloth with 15% solution of organosilicon resin, applying suspension consisting of alumino-phosphate binder and alumina powder onto glass cloth preforms, heat treatment of assembled packet of preforms to final temperature 270 C and keeping packet at this temperature for a period of time corresponding to 10-12 min per 1 mm of thickness at pressure 10 kg/sq.cm. After heat treatment, glass fiber plastic and analogously composed suspension are evacuated, after which glass fiber plastic is entirely immersed in suspension, pressure in system is equilibrated with atmospheric pressure, and system is maintained under these conditions for 15-20 min. Resulting material is dried at 20-25 C for 6-12 h and thermally treated to final temperature 270 C. EFFECT: increased mechanical strength of material. 1 tbl, 11 ex