What is the acceptable moisture content for marine plywood?

Between 5 and 15 percent at any place within the board (Clause 6.1).

What adhesive is mandated for IS 710 marine plywood?

Boiling Water Proof (BWP) grade synthetic resin adhesive conforming to IS 848.

How is the water resistance of marine plywood tested?

It is subjected to a 72-hour continuous boiling water test to check for delamination and retention of glue shear strength.

What is the difference between IS 303 and IS 710?

IS 303 covers general-purpose plywood (MR and BWR grades), while IS 710 specifically covers Marine Plywood (BWP grade) which has superior water resistance and structural strength.

IS 710

: 2010

Marine Plywood - Specification

CurrentFrequently UsedSpecificationMaterials Science · Timber and Wood

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This code specifies the manufacturing, requirements, and testing parameters for Marine Plywood. Engineers and architects reference this standard when specifying high-quality, water-resistant plywood for wet interiors (like kitchens), exterior construction, and marine applications.

Specifies the requirements for marine plywood suitable for applications where resistance to water, moisture, and marine organisms is essential.

Quick Reference Values

moisture content range5 to 15 percent

glue shear strength dry average min1350 N

glue shear strength dry individual min1100 N

glue shear strength after 72h boiling average min1000 N

tensile strength parallel to grain min42.0 N/mm²

tensile strength sum parallel and perpendicular min60.0 N/mm²

thickness tolerance less than 6mm± 10 percent

thickness tolerance 6mm and above± 5 percent

Practical Notes

Marine plywood MUST be bonded with Boiling Water Proof (BWP) grade synthetic resin adhesives (phenol-formaldehyde). Do not confuse it with BWR (Boiling Water Resistant) grade.

A key quality indicator is the 72-hour boiling water test. True IS 710 marine plywood will not delaminate after 72 hours of continuous boiling.

Ensure plywood edges are properly sealed during installation on site, as exposed edges are the primary point of moisture ingress even in marine grades.