METHOD OF THERMAL TREATMENT OF POLYMERIC HONEYCOMB PLASTIC ON THE BASE OF PHENOL-TYPE BINDER Russian patent published in 1995 - IPC

FIELD: chemistry. SUBSTANCE: components of the material are heated from temperature to 118-122 C at rate v₁= 0,8-1,2^°C/min of and held during 58-62 minutes. After that the material is heated till maximal hardening of the sample at rate v₂= 1,8-2,2^°C/min accomplished with permanent measured of electric conductivity G and loss tangent of a dielectric tgδ. Heating at sample maximal hardening temperature is stopped when constant values G and tgδ are reached. Characteristics of material are the following: time of thermal treatment 215 minutes, degree of hardening - 96%. EFFECT: improved efficiency. 1 tbl