Phenol-formaldehyde resin is a novolak type.
A polycondensation product of phenol and formaldehyde in the presence of a catalyst.
Novolac resins are produced in the form of pieces of irregular shape, flakes, crumbs or granules from white to yellow.
Mass fraction of free phenol,%, not more than 0 - 1.5
The polymerization time from 73 - 93
Fluidity mm, not less than 35 - 50