What is the difference between Grade I and Grade II boards?

Grade I boards have higher mandatory values for mechanical properties like Modulus of Rupture and Internal Bond Strength, making them stronger than Grade II boards (Table 2).

What is the standard thickness tolerance for an 18mm board?

For boards up to 25 mm thick, the tolerance on the nominal thickness is ±0.3 mm (Table 1).

Is this board waterproof?

No. Type II boards are for humid locations and have better moisture resistance than Type I (interior), but the core is not waterproof and requires edge protection.

What is the minimum required internal bond strength for Grade I boards?

The minimum internal bond strength for Grade I boards is 0.60 N/mm² (Table 2).

IS 12823

: 2015

Pre-laminated Particle Boards - Specification

CurrentFrequently UsedSpecificationBIMMaterials Science · Timber and Wood

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This standard specifies the requirements and test methods for pre-laminated particle boards. It covers boards made by laminating a decorative thermosetting resin-impregnated paper onto a plain particle board substrate, defining their dimensions, tolerances, physical and mechanical properties for two grades (Grade I and Grade II).

Specifies the requirements for particle boards that have a decorative laminate factory-bonded to their surfaces.

Quick Reference Values

Density (Type I Board)500 to 900 kg/m³

Thickness tolerance (up to 25 mm)±0.3 mm

Modulus of Rupture (MOR) - Grade I (>12mm thick)≥ 15.0 N/mm²

Internal Bond Strength - Grade I≥ 0.60 N/mm²

Screw Withdrawal Strength (Face) - Grade I≥ 1350 N

Abrasion Resistance (Initial Wear)≥ 150 revolutions

Water Absorption 2h (max)≤ 10.0 %

Practical Notes

Grade I is intended for higher-strength applications like furniture components, while Grade II is suitable for general-purpose use such as partitions and paneling.

Proper edge banding is critical in practice, as the exposed particle board core is highly susceptible to moisture ingress, which can cause swelling and degradation.

Ensure the board type (Type I for interior, Type II for humid conditions) is correctly specified and used for the intended environment.