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

Grade I is for general interior use, while Grade II (also known as Exterior Grade) has higher moisture resistance for use in humid conditions. (Clause 5)

What is the standard density range for Grade I MDF?

The density must be between 600 kg/m³ and 800 kg/m³. (Table 1)

What is the maximum allowed thickness swelling for Grade I boards after 24-hour water immersion?

For boards thicker than 6mm, the maximum swelling is 12%. (Table 1)

What are the standard thickness tolerances for MDF boards?

The tolerance is ±0.3 mm for sanded boards. (Table 3)

IS 12406

: 2003

Medium Density Fibre Boards for General Purpose -Specification

CurrentFrequently UsedSpecificationBIMMaterials Science · Wood and Other Lignocellulosic Products

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This standard specifies the requirements for general-purpose Medium Density Fibreboards (MDF). It covers materials, dimensions, tolerances, and physical and mechanical properties for two grades of MDF, along with the necessary testing methods for quality assurance.

Medium Density Fibre Boards for General Purpose -Specification

Quick Reference Values

Density Range (Grade I)600 to 800 kg/m³

Moisture Content5 to 11 percent

Modulus of Rupture (MOR) min for Grade I (>12mm thick)30 N/mm²

Internal Bond Strength min for Grade I0.60 N/mm²

Thickness Swelling max (24h) for Grade I (>6mm thick)12 %

Practical Notes

Grade I is for general interior use, while Grade II is intended for applications in humid conditions (e.g., kitchen and bathroom furniture), requiring better moisture resistance.

MDF is a non-structural material and should not be used for load-bearing applications. It is primarily used for cabinetry, shelving, and decorative panels.

Exposed edges and faces of MDF are highly susceptible to moisture. Proper sealing with paint, laminate, or edge banding is crucial for durability.