What is ?

Phenol Formaldehyde Resin

Phenol Formaldehyde (PF) resins or Phenolic resins are synthetic polymers obtained by the reaction of phenol or substituted phenol with formaldehyde.


There are two types of phenolic resins: Novolac resins (acid catalyst) and Resol resin (alkanine catalyst). These resins are known for high chemical and temperature stability.

Novolac

Novolacs are phenol-formaldehyde resins with a formaldehyde to phenol molar ratio of less than one with acidic catalyst. Novolacs are referred to as “2 stage” resins as they cure with a curing agent or hardener to form a thermoset.

Novolacs have multiple uses as tire tackifier, high temperature resin, binder for carbon bonded refractories, carbon brakes, photoresists and as a curing agent for epoxy resins.

Salient Features :
  • High thermal stability
  • Excellent bond strength
  • Good burst resistance
  • Low VOC, contributing to a safer working environment

Resol

Resoles are alkaline catalyzed phenol-formaldehyde resins made with a formaldehyde to phenol ratio of greater than one (usually around 1.5).

High crosslinking gives resole resin its hardness, good thermal stability, and chemical imperviousness. Resoles are referred to as “single stage” resins as they cure without a curing agent or hardener to form a thermoset.

Resoles are major polymeric resin materials widely used for gluing and bonding building materials. Exterior plywood, oriented strand boards (OSB) and engineered high-pressure laminate are its typical applications.

Salient Features :
  • Low VOC, contributing to a safer working environment
  • Good Chemical Resistance
  • High Thermal Insulation
  • Excellent bond strength
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