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IS 303:1989 is the Indian Standard (BIS) for plywood for general purposes - specification. This standard specifies the requirements for general-purpose plywood used in interior and semi-exterior applications. It defines the manufacturing processes, materials, and testing methods for Moisture Resistant (MR) and Boiling Water Resistant (BWR) grades.
Lays down the requirements for plywood intended for general applications, covering types, dimensions, quality, and testing.
BIM-relevant code. See the BIM Hub for ISO 19650, IFC, and LOD/LOIN frameworks used alongside it.
Practical Notes
! Do not confuse BWR (Boiling Water Resistant) under IS 303 with BWP (Boiling Water Proof) marine plywood under IS 710. BWR is meant for interior/semi-exterior use, whereas BWP is for marine and fully exposed conditions.
! General-purpose plywood under IS 303 should not be used for concrete shuttering; use IS 4990 for formwork/shuttering plywood.
Consolidated list per BIS. For the text of each amendment, refer to the BIS portal link above.
plywoodtimberwoodveneersynthetic resinadhesive
International Equivalents
Similar International Standards
EN 636:2021CEN (European Union)
HighCurrent
Plywood — Specifications
Covers requirements for general purpose (non-structural) and structural plywood for use in dry, humid, or exterior conditions.
ISO 19543:2017ISO (International)
HighCurrent
Solid wood panels — Plywood — Specifications
Specifies requirements for general purpose plywood panels, including composition, manufacturing tolerances, and mechanical characteristics.
PS 1-19NIST / APA (US)
MediumCurrent
Voluntary Product Standard for Structural Plywood
Focuses on structural plywood for construction, but covers many similar manufacturing and bond quality requirements.
BS 6566-1:1985BSI (UK)
MediumWithdrawn
Plywood. Specification for construction of panels and workmanship of boards
A historical equivalent from a similar era, providing prescriptive requirements for plywood construction before harmonization with EN standards.
Key Differences
≠IS 303:1989 has no requirements for formaldehyde emissions. Modern standards like EN 636 (via EN 13986) mandate strict limits (e.g., Class E1 or E2) due to health concerns associated with urea-formaldehyde adhesives.
≠IS 303 specifies prescriptive adhesive types (Phenol Formaldehyde for BWP, Urea Formaldehyde for MR). European standards (EN 314-2) define performance-based 'Bonding Classes' (1, 2, 3) based on resistance to dry, humid, and exterior conditions, allowing any adhesive that meets the performance test.
≠IS 303 is for 'General Purposes' and lacks the detailed mechanical property requirements (e.g., bending strength, modulus of elasticity) needed for structural design. Standards like PS 1-19 are specifically for 'Structural Plywood' and provide characteristic values for engineering calculations.
≠IS 303 lists a specific set of approved Indian timber species for use. International standards are generally species-agnostic, instead classifying species into strength groups or requiring performance properties to be determined and declared by the manufacturer.
Key Similarities
≈All standards are based on the fundamental construction of plywood, defined as a panel of cross-banded wood veneers bonded together with an adhesive under heat and pressure.
≈The core of all specifications is the quality of the adhesive bond. All include tests for glue-line shear strength and resistance to delamination after exposure to moisture (e.g., IS 303's boiling test for BWP grade is conceptually similar to bond durability tests in EN 314-2).
≈All standards specify permissible manufacturing tolerances for panel dimensions, including length, width, thickness, and squareness, to ensure consistency and usability.
≈Control of moisture content is a common requirement in all standards to ensure dimensional stability of the final product, typically requiring it to be within a specified range (e.g., 5-15%).
Parameter Comparison
Parameter
IS Value
International
Source
Formaldehyde Emission
Not specified
Class E1: ≤ 8 mg/100g dry board (perforator method EN 120)
EN 13986:2004+A1:2015
Bond Quality Test (Highest Durability Grade)
No delamination after 72 hours in boiling water (for BWP Grade).
Shear strength test after a cycle of 4-hour boil + 20-hour drying + 4-hour boil + cooling (for Bonding Class 3).
EN 314-2:2013
Bond Quality Test (Interior/Moisture Resistant Grade)
No delamination after 3 hours in warm water at 60±2 °C (for MR Grade).
Shear strength test after soaking in water at 20 °C for 24 hours (for Bonding Class 2 - humid conditions).
EN 314-2:2013
Glue Shear Strength (Dry, Average)
≥ 1.04 N/mm² (for BWP Grade, calculated from specified load)
≥ 1.0 N/mm² (for all bonding classes)
EN 314-2:2013
Moisture Content
5% to 15%
To be determined (per EN 322) and declared by the manufacturer.
EN 636:2021
Thickness Tolerance (Sanded, 9mm nominal)
± 0.6 mm
± 0.5 mm (for appearance class dependent tolerances)
EN 315:2000
⚠ Verify details from original standards before use
Key Values6
Quick Reference Values
permissible moisture content5% to 15%
standard thickness range3 mm to 25 mm
thickness tolerance less than 6mm± 10%
thickness tolerance greater than 6mm± 5%
BWR water resistance test requirementBoiling water for 8 hours
MR water resistance test requirementWater at 60±2°C for 3 hours