Types of plywood glue

Type A: Phenol Formaldehyde (PF)

Phenolic resins are the strongest bond and are also waterproof. The polymer is thermosetting and has to be cured at elevated temperatures. The result is a permanent bond that can be exposed to heat, cold or wet conditions for a long time without deteriorating. This glue bond is used for the manufacture of structural plywood or film faced plywood. It is weather and boil proof (WBP) because phenolic resins have no melting point but only a decomposing point in the temperature zone of 220 °C.

Type B: Melamine Fortified Urea Formaldehyde (MUF)

Melamine-urea formaldehyde (MUF) adhesives are adhesives which combine the properties from urea and melamine polymers, to ensure optimal and cost-efficient performance.

Type B glue bond is waterproof but will deteriorate after several years of being exposed continuously to weather. Its curing process may be performed both at room temperature and higher temperature depending on the application and performance requirements. Generally, melamine adhesives give very good water resistance and light coloured glue line. Plywood with a B-Bond is best used in situations of limited weather exposure, e.g. exterior door skins, marine plywood, and concrete formwork. It is waterproof but not weatherproof. Melamine glue plywood can be used in damp or wet places but can not last long under rain.

Type C: Urea-formaldehyde (UF)

Urea-formaldehyde (UF) adhesives are thermosetting, cost-efficient polymers, mainly used for interior applications. It can only withstand occasional exposure to dampness. It should not be used for structural applications or wet areas. Urea systems are chosen for their fast curing and wide operating window. Urea adhesives are cured at lower pH and elevated temperatures. Its price is the lowest among the three UF glues.

Uses For Different Glue