Specification for High-Density Wood Particle Boards

IS 3478: Scope & Key Specifications for High-Density Wood Particle Boards

Scope Summary:

• Specifies physical requirements and testing methods for high-density wood particle boards.
• Applies to Type 1 and Type 2, with Grades A and B.
• Ensures compliance by rounding off values per IS 2:1960.

Key Physical Requirements (Table Extract):

Sampling (Table 2):

IS 3478: Definitions Summary

• Definitions Reference: Clause 2.1 states that definitions are as per IS 707:1958 and IS 3087:1965 for wood particle boards.

Key Specifications from Clause 7.2 (Physical Requirements for High-Density Wood Particle Boards)

Sampling (Clause 7.2)

Test Standards Reference for Properties

• Moisture Content:

IS 3478: Types and Grades of High Density Wood Particle Boards

Types and Grades (Clause 3.1 & 3.2)

• Supplied in flat sheet or moulded form as per purchaser’s requirement.

Physical Requirements (Clause 7.2, Table 1)

Notes:

• Tests per IS 2380 (Parts 3,4,5,16 - 1977).
• Max variation in specimens:
  • Moisture Content ±10%
  • Modulus of

IS 3478: Key Specifications & Tables for Materials (Clause 7.2)

1. Physical Requirements for High-Density Wood Particle Boards

2. Testing Standards (IS 2380 series)

• Moisture Content: IS 2380 Part 6
• Modulus of Rupture: IS 2380 Part 5
• Tensile Strength: IS 2380 Part 7
• Water Absorption: IS 2380 Part 9
• Boiling Water Resistance: IS 2380 Part 14

3. Sampling Table (Number of boards to test)

4. Additional Notes

• Sizing Material: Up to 1% paraffin wax or equivalent.
• Tolerance: Max ±10% for modulus of rupture and ±2% for moisture content.

This concise summary covers essential material properties, testing methods,

IS 3478: Manufacture Specifications for High-Density Wood Particle Boards

Key Physical Requirements (Clause 7.2, Table 1)

Sampling (Clause 7.2, Table 2)

Additional Specifications

• Sizing Material: Paraffin wax (max 1%) dissolved/emulsified in mineral spirits or water (Clause 4.3).
• Form: Boards

IS 3478: Dimensions and Tolerances for High Density Particle Boards

1. Standard Dimensions (Clause 6.1)

Other dimensions may be agreed upon between manufacturer and purchaser.

2. Tolerances on Finished Boards (Clause 6.3 & 6.3.1)

3. Notes

• Moulded boards must conform to purchaser's drawings and tolerances (Clause 9.1.1).
• Thickness tolerance varies with thickness range, stricter for thicker boards.

Summary Table

This ensures dimensional accuracy and quality control in particle board manufacturing.

IS 3478: Physical Requirements for High-Density Wood Particle Boards (Clause 7.2)

Key Specifications (from Table 1)

Test Standards

• Modulus of Rupture & Elasticity: IS 2380 (Part 3 & 4)
• Tensile Strength: IS 2380 (Part 5)
• Water Absorption: IS 2380 (Part 16)
• Boiling Water Resistance: Clause 9.3 of IS 3478

Tolerances

• Density: ±10%
• Moisture Content: ±2%

Sampling (Table 2)

IS 3478: Sampling and Test Specimens - Key Formulas & Tables

1. Sampling Scale (Clause 8.1 & Table 2)

Number of particle boards to select from a lot (N = lot size):

2. Test Specimen Size for Density (Clause 8.2.2)

• Dimensions: Full thickness, 7.5 cm width × 15 cm length

3. Physical Requirements (Table 1 - Clause 7.2 & 9.2)

4. Test Methods (IS 2380 series)

• Density: Clause 6
• Moisture Content: Clause 5
• Modulus of Rupture: Clause 7
• Tensile Strength: Clause 9
• Water Absorption: Clause 14

5. Permissible Variation

• Density: ±10%
• Moisture Content:

IS 3478: Methods of Test and Requirements for High-Density Wood Particle Boards

Key Specifications from Table 1 (Clause 7.2 & 9.2)

Test Methods (IS 2380 series)

IS 3478: Marking & Key Specifications for Particle Boards

Marking (Clause 10.1):
Each particle board edge must be legibly marked with:

• Manufacturer's name or trademark
• Type and grade of the particle board

Physical Requirements (Clause 7.2 & Table 1)

Tests per IS 2380 (Parts 3,4,5,16)

Sizing Material (Clause 4.3)

• Use suitable sizing like paraffin wax dissolved in mineral spirits or emulsified in water.
• Maximum sizing material: 1% by weight.

Sampling (Clause 7.2, Table 2)

| Population Size (N) | Sample Size (

IS 3478 - Clause 8.4: Criteria for Conformity

Key Points:

• Lot conformity is based on samples and test specimens passing the tests in Clause 9.
• Tests follow methods and requirements in Table 1 (Clause 9.2).

Table 1: Physical Requirements for High Density Wood Particle Boards

Test Standards (IS 2380 series):

• Moisture Content: IS 2380 (Part 3): 1977
• Modulus of Rupture: IS 2380 (Part 4): 1977
• Modulus of Elasticity: IS 2380 (Part 4): 1977
• Tensile Strength: IS 2380 (Part 5): 1977