What are the main types of adhesives classified in IS 848?

It classifies adhesives into BWP (Boiling Water Proof), BWR (Boiling Water Resistant), MR (Moisture Resistant), and CWR (Cold Water Resistant).

Which resin type is used for Boiling Water Proof (BWP) plywood?

Phenol-formaldehyde (PF) resin is required to achieve BWP and BWR grade water resistance.

How is the strength of the adhesive evaluated?

It is evaluated by measuring the glue shear strength of standard test panels under dry, wet (boiling/warm water), and mycological (fungal) conditions.

IS 848

: 2006

Specification for Synthetic Resin Adhesives for Plywood (Phenolic And Aminoplastic)

CurrentSpecializedSpecificationMaterials Science · Wood and Other Lignocellulosic Products

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This standard prescribes the specifications for synthetic resin adhesives (phenolic and aminoplastic) used in the manufacture of plywood. It classifies adhesives into different grades (BWP, BWR, MR, CWR) based on water resistance and details the preparation and testing of veneer panels to evaluate glue shear strength.

Specification for Synthetic Resin Adhesives for Plywood (Phenolic And Aminoplastic)

Quick Reference Values

BWP (Boiling Water Proof) test duration72 hours boiling

BWR (Boiling Water Resistant) test duration8 hours boiling

MR (Moisture Resistant) test duration3 hours in warm water at 60°C

pH of liquid aminoplastic resinTypically 7.0 to 8.5

Practical Notes

For wet areas or exterior use, engineers should always specify plywood bonded with Phenol-Formaldehyde (BWP/BWR grade) instead of Urea-Formaldehyde (MR grade).

The standard tests the adhesive's performance rather than the plywood itself, using standard veneer test panels evaluated per IS 1734.

Shelf life and proper storage temperature of the resin are critical, as synthetic resins can cure prematurely if exposed to high ambient temperatures.