This standard specifies the requirements for fire retardant plywood used in building interiors, railway coaches, and other applications. It covers material composition, manufacturing, dimensions, and performance characteristics, particularly focusing on fire resistance tests like flammability and rate of burning.
Specifies the requirements for plywood treated to have fire retardant properties, including test methods and performance criteria.
Quick Reference Values
Rate of Burning Test Minimum Time20 minutes (for weight loss from 30% to 70%)
Flammability Test Duration30 minutes
Minimum Glue Shear Strength (WBP Dry State)1350 N
Minimum Glue Shear Strength (WBP after 72h boil)1000 N
Maximum Moisture Content15 percent
Thickness Tolerance (Sanded)±5 percent
Practical Notes
Always check for the 'Type FR' marking and the ISI mark on the plywood to ensure compliance.
Fire retardant treatment can slightly increase the density and affect the color of the plywood; this is normal and not a defect.
This standard defines a material property. For fire-rated assemblies like doors or walls, refer to fire-resistance rating standards like IS 3614.