IS 3965 : 2020

Plywood for Concrete Shuttering Work

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CurrentFrequently UsedSpecificationMaterials Science · Timber and Wood
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Summary

IS 3965 specifies plywood for concrete shuttering — must be BWP (Boiling Water Proof) grade to withstand moisture from fresh concrete. Film-faced (phenolic coating) versions give smoother concrete finish and more reuse cycles. Standard thickness is 12mm and 18mm.

Specification for plywood specifically designed for use as concrete shuttering/formwork, covering construction, bonding, dimensions, mechanical properties, and surface quality.

Key Values
Standard thicknesses12mm and 18mm
BondingBWP (Boiling Water Proof) only
Film-faced reuse50-80 cycles
Practical Notes
! NEVER use MR (Moisture Resistant) grade plywood for shuttering — it will delaminate from concrete moisture.
! Film-faced (brown/black phenolic overlay) plywood gives smooth concrete finish and lasts 50+ cycles.
! Apply mould release oil before every pour — prevents concrete bonding and extends plywood life.
! 12mm is standard for slabs. 18mm for walls and columns where concrete pressure is higher.
! ISI mark ensures BWP quality — unmarked 'shuttering ply' may be MR grade disguised as BWP.
Cross-Referenced Codes
IS 456:2000Plain and Reinforced Concrete - Code of Pract...
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IS 710:2010Marine Plywood - Specification
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IS 303:1989Plywood for General Purposes - Specification
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IS 848:2006Specification for Synthetic Resin Adhesives f...
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shuttering plywoodformwork plywoodconcrete formworkBWP plywoodconstruction plywood