What is the main difference between shuttering ply and commercial ply?

Shuttering ply (IS 10701) uses BWP grade adhesive and has a higher density (min 750 kg/m³) for strength. Commercial ply (IS 303) typically uses MR grade (moisture resistant) adhesive and is not suitable for direct contact with wet concrete.

What does BWP stand for?

BWP stands for 'Boiling Water Proof'. It indicates the use of Phenol Formaldehyde synthetic resin that can withstand a 72-hour boiling water test without delamination, as required by Clause 10.3.

What is the standard size of a shuttering ply sheet?

Common sizes include 2440 x 1220 mm, 2140 x 1220 mm, and 1840 x 1220 mm, with thicknesses ranging from 12 mm to 25 mm as per Clause 7.1.

Is film-facing mandatory for shuttering plywood?

No, the standard does not mandate a film face, but it allows for it. Film-faced shuttering plywood provides a smoother concrete finish and significantly increases the number of reuses.

IS 10701

: 1996

Plywood for Concrete Shuttering Work - Specification

CurrentFrequently UsedSpecificationBIMMaterials Science · Timber and Wood

Download PDF BIS Portal Google

This standard specifies the requirements for high-density plywood intended for use in constructing formwork (shuttering) for concrete structures. It covers the materials, manufacturing process, dimensions, physical and mechanical properties, and testing methods to ensure the plywood can withstand the loads from wet concrete and be reused.

Specifies the requirements for plywood manufactured specifically for use as concrete formwork, including strength and durability.

Quick Reference Values

Minimum density750 kg/m³

Water resistance test duration72 hours in boiling water

Minimum number of plies for 12 mm thickness9

Adhesive typeBoiling Water Proof (BWP) Phenol Formaldehyde (PF)

Minimum average dry glue shear strength13.7 N/mm²

Minimum modulus of rupture (along the face grain)50.0 N/mm²

Practical Notes

Shuttering plywood is distinct from Marine plywood (IS 710); while both use BWP adhesive, shuttering ply is denser and designed to withstand the abrasive, alkaline environment of concrete.

The number of reuses (repetitions) is not specified by the code and depends heavily on site handling, application of mould-release agents, and proper storage.

Ensure the face veneers are smooth and often film-faced to provide a good concrete finish and increase the lifespan of the formwork.