Table 1. Characterisitcs of phenol-formaldehyde resin for the test

Resin types items	Powder resin (novolak type)	Liquid resin (resol type)
Solid content (%)	99	51–53
Melting point (°C)	80–95	-
Specific gravity	-	1.06
Celation time (sec.)	80–120	80–95
Plate flow (mm)	30–35	-
Viscosity (cps)	-	45–65