Prelaminated cement bonded particle board -Specification

IS 15786: Scope - Key Specifications & Tables

Scope Summary:

• Applies to particle boards with specific physical and mechanical properties.
• Test specimens: discs (~130 mm diameter) or squares (~120 mm side with rounded corners).
• Conditioning: 27 ± 2℃ and 65 ± 5% RH for 72 hours before testing.

Key Physical & Mechanical Properties (Table 1)

Conditioning & Testing Notes:

• Specimens cleaned with organic solvent (e.g., 1-1-1-trichloroethane).
• Accelerated water resistance: boil specimens 2 h, dry at 27 ± 2℃ to ~12% moisture, then test tensile strength.
• Abrasion test: specimen rotated against abrasive wheels; revolutions to wear-through indicate resistance.

Reference Standards (Annex A)

• IS 1500: Brinell hardness test
• IS 2380 (Parts 1-4): Test methods for lignocellulosic materials
• IS 2794: Truing/dressing tools
• IS 4905, 14276: Hardness and sampling methods
• Others for tensile strength, water absorption, swelling, screw withdrawal

flowchart LR

IS 15786 Key References & Specifications

1. Physical & Mechanical Properties (Table 1)

2. Accelerated Water Resistance Test

• Boil specimens for 2h, dry at 27 ± 2°C to ~12% moisture, then test tensile strength perpendicular to surface.

3. Referenced IS Standards (Annex A)

• IS 324: Specification for ordinary denatured spirit
• IS 707: Glossary for timber technology
• IS 1500: Brinell hardness test method
• IS 2380 (Parts 1-4, 16, 17): Methods for wood particle boards (moisture, density, bending strength, water absorption, swelling)
• IS 2794: Specification for diamond tools
• IS 3400 (Part 2): Hardness test for vulcanized rubber
• IS 4905, 14276: Sampling & cement bonded particle boards

4. Abrasion Resistance Test (Annex B)

• Specimens rotated against abrasive wheels; number of revolutions to defined wear measures resistance.
• Conditioning: 27 ± 2°C, 65 ± 5% RH for 72h before test.
• Specimen size: ~130 mm diameter disc or ~120 mm square with rounded corners and 6 mm center hole.

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IS 15786: Definitions & Key Specifications Summary

Definitions:

• Uses terms from IS 707 (Glossary of Timber Technology).
• Final test/analysis values rounded per IS 2:1960 rules, maintaining significant figures as specified.

Conditioning Chamber (Clause B-3.2):

• Temperature: 27 ± 2°C
• Relative Humidity: 65 ± 5%

Test Specimens (Clause B-4):

• Shape: Disc ~130 mm diameter or square ~120 mm with rounded corners (diagonal ~130 mm)
• Centre hole: 6 mm diameter
• Quantity: 3 specimens per test

Specimen Preparation (Clause B-5):

• Clean with organic solvent (e.g., 1-1-1-trichloroethane)
• Precondition in standard atmosphere for ≥72 hours

Physical & Mechanical Properties (Table 1)

Notes on Testing:

• Accelerated Water Resistance Test: Specimens boiled 2h, dried at 27 ± 2°C to ~12% moisture, then tested.
• Abrasion Resistance: Specimen rotated against abrasive wheels; revolutions to defined wear indicate resistance.

References to Other IS Standards:

• IS 707: Glossary of Timber Terms

IS 15786: Prelaminated Cement Bonded Particle Boards (CBPB)

Types of Prelaminated CBPB (Clause 4.1 & Table 1)

• Type I: Low abrasion resistance
• Type II: Medium abrasion resistance
• Type III: High abrasion resistance

These types are classified based on surface abrasion characteristics as per Table 1 (SI No. viii).
(Exact abrasion values are in IS 15786 Table 1, typically measured by Taber Abrasion Test.)

Thickness Specifications (Clause 8.2)

• Standard thicknesses:
  6 mm, 8 mm, 10 mm, 12 mm, 16 mm, 20 mm, 25 mm, 30 mm, 40 mm
• Custom dimensions allowed by mutual agreement.

Base Material (Clause 5.1)

• Use cement bonded particle board conforming to IS 14276.
• Must have a fine and closed surface for lamination.

Summary Table: Types & Thickness

If needed, I can provide the Taber Abrasion Test formula or details on lamination methods.

IS 15786: Key Material Specifications & Tests

Important Test Conditions:

• Accelerated Water Resistance Test: Boil specimen 2h, dry at 27±2°C to ~12% moisture.
• Abrasion Test: Specimen rotated against abrasive wheels; revolutions to wear-through recorded.
• Conditioning: 27±2°C, 65±5% RH for 72h before testing.

References for Methods:

• IS 2380 (Parts 1, 5, 16, 17) for moisture, tensile, water absorption, swelling.
• IS 2794 for tool specifications.
• IS 707 for timber terminology.

flowchart LR
    A[Material Sample] --> B[Conditioning (27±2°C, 65±5% RH)]
    B --> C[Water Absorption Test (IS 2380 Pt 16)]
    B --> D[Tens

IS 15786: Surface Finishes - Key Specifications & Test Methods

Surface Finish Types (Clause 6.2)

• Glossy
• Matt
• Textured: Soft, Swede, Wood pore, Leather
• Foil finish depends on original foil surface

Conditioning (Clause 3.2)

• Temperature: 27 ± 2°C
• Relative Humidity: 65 ± 5%
• Specimens & abrasive paper preconditioned for 72 h

Test Specimen (B-4 & B-5)

• Shape: Circular disc (~130 mm dia) or square (~120 mm side, rounded corners)
• Central hole: 6 mm dia
• Cleaning: Organic solvent (e.g., 1-1-1-trichloroethane)
• Number: 3 specimens per test

Abrasion Resistance Test (Annex B)

• Specimen rotated against loaded abrasive wheels
• Abrasion measured by number of revolutions to wear-through
• Minimum revolutions (Table 1):

Physical & Mechanical Properties (Table 1 Summary)

Tensile Strength Perpendicular to Surface (Clause 10.7)

• Test per IS 2380 (Part 5)
• Average values must meet

IS 15786 - General Requirements Summary

Key Physical & Mechanical Properties (Table 1)

Important Notes:

• Accelerated Water Resistance Test: Specimens boiled for 2 h, dried at 27 ± 2°C to ~12% moisture before tensile strength test.
• Conditioning: Specimens conditioned at 27 ± 2°C and 65 ± 5% RH for at least 72 h before testing.
• Abrasion Test: Specimen rotated against abrasive wheels; revolutions to wear-through indicate resistance.

References for Test Methods (Annex A):

• IS 2380 (Parts 1-4, 16, 17) for moisture, density, bending strength, water absorption, swelling.
• IS 324, IS 2794, IS 14276 for hardness and sampling.
• IS 707 for timber terminology.

Summary Diagram: Property Requirements

graph TD
    A[Physical Properties] --> B[Density ≥ 1250 kg/m³]
    A --> C[Water Absorption ≤ 13% (2h), 25% (24h)]
    A --> D[Thickness Swelling ≤ 2% (2h)]

IS 15786: Dimensions and Tolerances for Prelaminated Cement Bonded Particle Boards

Key Tolerances (Clause 8.3)

Edge Straightness (Sanded Boards)

• Maximum deviation: 2 mm per 1000 mm (0.2%)

Additional Notes

• Surface finish varies by caul plate type: glossy, matt, textured (soft, swede, wood pore, leather).
• Foil finished boards' surface depends on the foil's original finish.
• Rounding off test results follows IS 2:1960 rules, matching significant digits of specified values.

Summary Diagram

graph TD
    A[Board Dimensions] --> B[Length ±5 mm]
    A --> C[Width ±5 mm]
    A --> D[Thickness]
    D --> D1[Unsanded 6-12 mm ±1 mm]
    D --> D2[12-20 mm ±1.5 mm]
    D --> D3[>20 mm ±2 mm]
    A --> E[Edge Straightness 2 mm/1000 mm]

This ensures dimensional accuracy and quality compliance for cement bonded particle boards per IS 15786.

IS 15786: Sampling and Inspection Key Points

1. Sampling Scale (Clause 9.1.1.2)

2. Inspection Criteria (Clause 9.3)

• A lot is conforming if all sampled boards and test specimens meet the specifications in Clauses 7 and 10.
• This includes dimensional tolerances such as thickness and edge straightness.

3. Dimensional Tolerances (Clause 1.5)

• Edge straightness for sanded boards: 2 mm per 1000 mm (0.2%).

flowchart TD
    A[Lot Size N] --> B[Select n Boards as per Table]
    B --> C{Test Samples}
    C -->|Pass all| D[Lot Conforms]
    C -->|Fail any| E[Lot Rejected]

This ensures quality control by statistically sampling boards from each lot and verifying conformance before acceptance.

IS 15786: Key Formulas, Tables & Specifications for Tests

1. Conditioning Chamber (Clause 3.2)

• Temperature: 27 ± 2°C
• Relative Humidity: 65 ± 5%

2. Test Specimens (Clause B-4 & 10.2)

3. Preparation (Clause B-5)

• Clean specimens with 1-1-1-trichloroethane (organic solvent).
• Precondition specimens & abrasive strips for 72 hours in conditioning chamber.

4. Resistance to Cracking (Annex D)

• Specimen: 100 × 100 × thickness
• Oven temperature & duration:
  • 70 ± 2°C for 24 h
  • 100 ± 2°C for 2 h
• Observe for cracks on lamination surface.

5. Resistance to Cigarette Burn (Annex E)

• Specimen: 200 × 100 × thickness
• Place glowing cigarette for 60 seconds.
• Clean & check for blisters or discoloration.

6. **Resistance to Stain (Ann

IS 15786 — Marking & Key Specifications

BIS Certification Marking (Clause 11.2)

• Product may be marked with the BIS Standard Mark.
• Use governed by Bureau of Indian Standards Act, 1986.
• Licensing details available from BIS.

Physical & Mechanical Properties (Table 1, Clause 10.9)

Accelerated Water Resistance Test

• Specimens boiled 2 h, dried at 27 ± 2°C to ~12% moisture.
• Tensile strength perpendicular to surface tested post-treatment.

Abrasion Resistance Test (Annex B)

• Specimen rotated against abrasive wheels.
• Number of revolutions to defined abrasion = abrasion resistance.
• Specimen size: ~130 mm diameter disc or ~120 mm square with rounded corners.
• Preconditioning: 72 h at 27 ± 2°C, 65 ± 5% RH.
• Cleaning: Organic solvent (e.g., 1-1-1-trichloroethane).

Summary Diagram: Marking & Testing Flow

flowchart TD
    A[Manufacture Product] --> B[Apply BIS Standard Mark]
    B --> C[Physical & Mechanical Tests]

IS 15786: BIS Certification Marking & Key Specifications

Certification Marking (Clause 11.2 & 11.2.1)

• Products may bear the BIS Standard Mark under the Bureau of Indian Standards Act, 1986.
• Licensing conditions for use of the Standard Mark are regulated by BIS.

Key Physical & Mechanical Properties (Clause 10.9, Table 1)

Accelerated Water Resistance Test

• Specimens boiled in water for 2 h.
• Dried at 27 ± 2°C to ~12% moisture.
• Tensile strength perpendicular to surface measured post-test.

Abrasion Resistance Test (Annex B)

• Specimen rotated against abrasive wheels.
• Number of revolutions until wear-through indicates abrasion resistance.

Conditioning (Clause 3.2)

• Standard atmosphere: 27 ± 2°C, 65 ± 5% RH.
• Specimens preconditioned 72 h before testing.

References to Related IS Standards

• IS 2380 (Parts 1-4, 16, 17): Testing methods for particle boards.
• IS 1500: Brinell hardness test.
• IS 14276: Hardness testing of rubber.
• IS 2794

IS 15786 - List of Referenced Indian Standards (Annex A)

Key Points:

• These standards cover testing methods, material specifications, and terminology essential for compliance.
• For example, IS 324 is referenced for denatured spirit used in staining resistance tests.
• Mechanical properties like modulus of rupture, water absorption, and abrasion resistance are tested as per these standards.
• Surface abrasion resistance test (Annex B) involves rotating specimens against abrasive wheels and counting revolutions to failure.

Visual: Abrasion Resistance Test Setup

flowchart LR
    A[Specimen mounted horizontally] --> B[Rotates under abrasive wheels]
    B --> C[Abrasive wheels contact specimen surface]
    C --> D[Annular abrasion track formed]
    D --> E[Count revolutions to defined abrasion]
    E --> F[Measure abrasion resistance]

For detailed test procedures and parameters, refer to the respective IS codes listed above.

IS 15786 - Surface Abrasion Resistance Test (Clause 10.10 & Annex B)

Test Principle

• Specimen rotates against two loaded abrasive wheels covered with abrasive paper.
• Abrasion occurs on an annular track.
• Number of revolutions to reach defined wear (95% surface worn through to particle board) measures abrasion resistance.

Specimen Details

• Shape: Disc (~130 mm diameter) or square (~120 mm side, rounded corners, 6 mm center hole).
• Number: 3 specimens per test.
• Conditioning: 27 ± 2℃, 65 ± 5% RH for at least 72 hours.

Procedure Summary

1. Clean surface with organic solvent (e.g., 1-1-1-trichloroethane).
2. Mount specimen; set revolution counter to zero.
3. Abrade with two abrasive wheels.
4. Inspect every 25 revolutions; replace abrasive paper if clogged or after 500 revs.
5. Continue until 95% surface wear visible.
6. Record revolutions at final wear point.

Result Expression

• Wear resistance = half the recorded revolutions per specimen.
• Average of 3 specimens, rounded to nearest 25 revs.

Minimum Abrasion Resistance (Table 1)

Quick Reference Formula:

[ \text{Wear Resistance} = \frac{\text{Revolutions at final wear}}{2} ]

flowchart LR
    A[Prepare Specimens] --> B[Condition at 27±2℃, 65±5% RH]
    B --> C[Clean Surface]
    C --> D[Mount Specimen]
    D --> E[Abrade with Wheels]
    E --> F{Every 25 revolutions}
    F -->|Inspect wear| G{95% surface worn?}
    G -->|No| E
    G -->|Yes| H[Record revolutions]
    H --> I[Calculate wear resistance = revolutions/2]
    I --> J[Average 3 specimens]

This method ensures reliable, repeatable measurement of decorative surface durability per IS 15786.

IS 15786: Method for Determining Surface Resistance to Steam

Key Specifications (Annex C, Clause 10.11)

• Test Purpose: Surface resistance of prelaminated cement bonded particle board to steam at atmospheric pressure.
• Number of Specimens: 3 per test.
• Specimen Size: 100 mm × 100 mm × thickness of board.
• Specimen Preparation: Cut 150 mm away from board corner; edges must be compact with no loose core particles.
• Acceptance Criteria: No blistering, delamination, or surface finish change (slight color change in dark colors allowed).

Test Procedure Summary (Annex C)

1. Prepare 3 specimens as per size and condition.
2. Expose specimens to steam at atmospheric pressure.
3. Inspect specimens post-exposure for defects.
4. Reject if blistering, delamination, or surface finish changes occur.

Related Conditioning (Clause 3.2)

• Conditioning chamber at 27 ± 2°C and 65 ± 5% RH before testing.

Abrasion Resistance (Clause 6.3 & Annex B)

• Abrasion test involves rotating specimen against abrasive wheels.
• Record revolutions until 95% surface wear (particle board visible).
• Wear resistance = half the revolutions recorded.
• Average of 3 specimens rounded to nearest 25 revolutions.

Summary Table: Physical Requirements (Clause 10.9)

Diagram: Test Setup for Surface Resistance to Steam

flowchart LR
    A[Specimen Preparation] --> B[Conditioning at 27±2°C, 65