Table 1.
Characteristics of phenol-formaldehyde resin for the test
Resin types
Powder resin
(Novolak type)
Liquid resin
(Resol type)
Items
Solid content (%)
99
51~53
Melting point (°C)
80~95
-
Specific gravity
-
1.06
Gelation time (sec)
80~120
80~95
Plate flow (mm)
30~35
-
Viscosity (cps)
-
45~65