Coir Veneer Board for General Purposes -Specification

IS 14842: Scope & Key Specifications

• Scope (Clause 3.1): Defines terms relevant to the standard, ensuring uniform understanding for application.

• General Requirements (Clause 12.1): Specifies overall criteria for materials and workmanship to meet performance standards.

• Test Specimen (Clause 11.1): Details preparation and selection of samples for testing to verify compliance.

• Dimensions & Tolerances (Clause 8.3.1):

• Note: Other dimensions can be agreed upon between manufacturer and purchaser.

• Workmanship and Finish (Clause 9): Specifies quality standards for surface finish and fabrication.

Summary Table: Thickness Tolerances

This ensures dimensional accuracy critical for structural integrity and fitment.

IS 14842 Key Definitions & Specifications

1. Definitions (Clause 3.1)

• Standard definitions apply for terms used in the specification (e.g., thickness, width, length, modulus of rupture).

2. Dimensions & Tolerances (Clause 8.3.1)

Note: Other dimensions (length, width, thickness) can be mutually agreed between manufacturer and purchaser.

3. Mechanical Properties (Clause 11.4)

• Testing as per IS 1734 (Part II): average and minimum values must comply.

Summary Diagram: Dimension Tolerance Decision

flowchart TD
    A[Thickness] --> B{< 6 mm?}
    B -- Yes --> C[Tolerance ± 10%]
    B -- No --> D[Tolerance ± 5%]

This ensures quality control in thickness and mechanical strength for plywood as per IS 14842.

IS 14842: Key Material Properties and Specifications

1. Modulus of Rupture (MOR) & Modulus of Elasticity (MOE) — Clause 11.4

• Test specimens per IS 1734 (Part II): 3 per sample.
• MOR & MOE determined as per IS 1734 (Part II).

2. Dimensional Tolerances — Clause 8.3.1

• Other dimensions as mutually agreed.

3. Glue Shear Strength — Clause 11.2.2

Summary Diagram of Material Testing Flow

flowchart TD
    A[Sample Collection] --> B[Test Specimens (3 per sample)]
    B --> C[MOR & MOE Testing (IS 1734 Part II)]
    B --> D[Glue Shear Strength Testing]
    C --> E[Check Avg & Min Values]
    D --> E
    E --> F{Pass/Fail Criteria}

Note: Ensure all tests comply with IS 1734 and the specified minimum values for safety and quality assurance.

IS 14842: Grades of Coir Veneer Board - Key Specifications

• Coconut Fibre Layer (Clause 5.1):
  Uniform layer with a minimum mass of 600 g/m².

• Thickness Options (Clause 8.3):
  Available thicknesses (mm):
  3, 4, 5, 6, 9, 12, 16, 18, 20, 25

• Water Resistance & Glue Shear Strength (Clause 11.2.3):
  Tested as per IS 1734 (Part 6).
  Minimum glue shear strength values (average and individual) must meet Table 1 requirements (values not provided in context).

Typical Table Format for Glue Shear Strength (Example)

Note: Refer IS 14842 Table 1 for exact values.

Summary Diagram: Coir Veneer Board Composition

graph LR
A[Coconut Fibre Layer] --> B[Coir Veneer Board]
B --> C[Thickness: 3-25 mm]
B --> D[Water Resistance Test (IS 1734 Part 6)]
B --> E[Glue Shear Strength per Table 1]

For detailed values, consult IS 14842 full text and IS 1734 (Part 6).

IS 14842 - Manufacturing Process: Key Formulas, Tables & Specifications

1. Thickness Tolerances (Clause 8.3.1)

Note: Other agreed dimensions between manufacturer and purchaser are allowed.

2. Finished Board Size Tolerances (Clause 8.4)

3. Additional Dimensional Tolerances

4. Manufacturing Note

• Hot pressing process as per Clause 6.6 is employed.
• Workmanship and finish must adhere to Clause 9 requirements.
• Custom dimensions can be agreed upon between manufacturer and purchaser.

flowchart LR
    A[Raw Material] --> B[Hot Pressing (Clause 6.6)]
    B --> C[Thickness Control (±5% or ±10%)]
    C --> D[Cut to Size (Length & Width Tolerances)]
    D --> E[Edge Straightness & Squareness Check]
    E --> F[Final Inspection & Workmanship (Clause 9)]

Summary: IS 14842 specifies tight control on thickness, length, width, edge straightness, and squareness with defined tolerances to ensure quality manufacturing of boards.

IS 14842: Treatment and Conditioning Key Points

1. Specimen Conditioning (Clause 2.4)

• Condition specimens to constant mass at:
  • Relative Humidity: 65 ± 5%
  • Temperature: 27 ± 2°C

2. Treatment (Clause 6.2.1)

• Specimens must be treated as per the standard before testing (details depend on material and test type).

3. Conditioning of Adhesive Coated Felt & Jute Fibre (Clause 6.4)

• Use open assembly time or pass through a band dryer at:
  • Temperature: 80°C to 90°C
  • Moisture content reduced to 8-12%

4. Glue Shear Strength Requirements (Table 11.3, Clause 11.2.2)

Summary Diagram: Conditioning Process

flowchart LR
    A[Specimen Preparation] --> B[Condition at 65±5% RH, 27±2°C]
    B --> C{Adhesive Coated Felt/Jute?}
    C -- Yes --> D[Band Dryer 80-90°C]
    D --> E[Moisture Content 8-12%]
    C -- No --> F[Proceed to Testing]

This ensures standardized moisture content and adhesive cohesiveness for reliable test results.

IS 14842: Permissible Defects – Key Formulas & Tables

1. Thickness Tolerance (Clause 8.3.1)

2. Dimensional Tolerances on Finished Boards (Clause 8.4)

3. Thickness Tolerance on Finished Boards (Clause 8.4)

Notes:

• Edge straightness and squareness tolerances ensure board quality and fit.
• Thickness tolerance is critical for structural performance.
• Any other tolerances can be mutually agreed upon between manufacturer and purchaser.

flowchart TD
    A[Nominal Thickness] --> B{< 6 mm?}
    B -- Yes --> C[±10% Tolerance]
    B -- No --> D[≥ 6 mm]
    D --> E[±5% Tolerance]

    F[Finished Board Dimensions] --> G[Length: +6/-0 mm]
    F --> H[Width: +3/-0 mm]
    F --> I[Edge Straightness: 2 mm/1000 mm]
    F --> J[Squareness: 2 mm/1000 mm]

This summary covers all key permissible defect limits as per IS 14842 Clause 8.3.1 and 8.4.

IS 14842: Dimensions and Tolerances Summary

1. Thickness Tolerance (Clause 8.3.1)

Note: Other dimensions can be agreed upon between manufacturer and purchaser.

2. Finished Board Size Tolerances (Clause 8.4)

3. Additional Tolerances

Notes:

• Overlap is permitted only in core/crossbands (Clause 7.3).
• Dimensions other than above can be mutually agreed.

flowchart TD
    A[Nominal Thickness] -->|<6 mm| B[±10% Tolerance]
    A -->|≥6 mm| C[±5% Tolerance]
    D[Finished Board] --> E[Length +6/-0 mm]
    D --> F[Width +3/-0 mm]
    G[Edge Straightness & Squareness] --> H[2 mm per 1000 mm (0.2%)]

This concise summary ensures compliance with IS 14842 dimensional and tolerance requirements.

IS 14842: Workmanship and Finish Key Specifications

1. Thickness Tolerances (Clause 8.3.1)

2. Finished Board Size Tolerances (Clause 8.4)

3. Edge and Squareness Tolerances (Clause 9.2)

4. Additional Notes

• Boards must be delivered clean and suitably packed.
• Hot pressing for adhesive assembly:
  • BWR grade: ≥ 140°C
  • MR grade: 100–110°C
  • Pressure: 2.0 to 3.0 N/mm²

Summary Table

flowchart TD
    A[Raw Materials] --> B[Adhesive Coating]
    B --> C[Assembly of Layers]
    C --> D[Hot Pressing]
    D -->|BWR: ≥140°C| E[Finished Board]
    D -->|MR: 100-110°C| E
    E --> F[Inspection for Tolerances]
   

IS 14842: Sampling and Criteria for Conformity

Key References:

• Sampling Method & Criteria: As per IS 7638 (Wood/Lignocellulosic based panel products - Method for sampling).
• Test Specimen: Clause 11.1 refers to specimen preparation as per related IS codes.
• Dimensions & Tolerances (Clause 8.3.1):

Important Notes:

• Sampling must ensure representative samples as per IS 7638.
• Delivery condition: Clean and suitably packed coir veneer boards.
• Workmanship and finish must comply with Clause 9.
• Certification marking governed by BIS Act (Clause 12.3.1).

Summary of Sampling & Conformity:

• Follow IS 7638 for sampling plan and acceptance criteria.
• Use statistical sampling to verify conformity.
• Check dimensional tolerances strictly as per Clause 8.3.1.
• Test specimens prepared according to IS 1734 parts for physical and mechanical tests.

flowchart TD
    A[Start: Batch of Panels] --> B[Sampling as per IS 7638]
    B --> C{Sample meets criteria?}
    C -->|Yes| D[Batch accepted]
    C -->|No| E[Batch rejected or reprocessed]
    D --> F[Certification Marking (BIS)]
    E --> F

For detailed sampling plans and acceptance criteria, refer directly to IS 7638.

IS 14842: Testing Requirements Summary

1. Test Specimen (Clause 11.1 & 2.2)

• Specimens prepared as per Fig. 1 (typically standard shape/dimensions for uniformity).
• Conditioning before testing is mandatory.

2. Conditioning (Clause 2.4)

• Condition specimens to constant mass at:
  • Relative Humidity: 65 ± 5%
  • Temperature: 27°C ± 2°C

3. General Requirements (Clause 12.1)

• Tests to be conducted under controlled environmental conditions.
• Specimens should be free from defects and representative of the material batch.
• Testing apparatus must comply with standard calibration and accuracy.

Typical Test Specimen Dimensions (from Fig. 1, IS 14842)

Conditioning & Testing Flow:

flowchart LR
    A[Prepare Specimen as per Fig.1] --> B[Condition Specimen]
    B --> C[Maintain RH 65 ± 5% & Temp 27 ± 2°C]
    C --> D[Check Constant Mass]
    D --> E[Conduct Test as per Clause 12.1]

Note: Always refer to IS 14842 for detailed specimen preparation and testing procedures to ensure compliance.

IS 14842: Marking and Certification for Coir Veneer Board

Key Specifications:

• Marking Location:
  All marking shall be done on the face of the coir veneer board near one corner (Clause 12.2).

• Certification Mark:
  Coir veneer boards may bear the BIS Standard Mark as per Clause 12.3, governed by the Bureau of Indian Standards Act, 1986.

• Packaging:
  Boards should be delivered clean and suitably packed unless otherwise specified.

Tolerances on Thickness (Clause 8.3.1):

Note: Other dimensions can be agreed upon between manufacturer and purchaser.

Referenced IS Standards (Annex A):

• IS 1734 (Parts 1, 2, 3, 6, 7): Methods of test for plywood (density, moisture, water resistance, mycological test).
• IS 9308 (Parts 2, 3): Specification for mechanically extracted coir fibers.
• IS 12049: Dimensions and tolerances for wood-based panel materials.

Summary Diagram: Marking & Certification Flow

flowchart TD
    A[Manufacture Coir Veneer Board] --> B[Clean & Pack Board]
    B --> C[Apply Marking on Face Near Corner]
    C --> D{BIS Certification?}
    D -- Yes --> E[Apply BIS Standard Mark]
    D -- No --> F[No Certification Mark]

This ensures traceability, quality compliance, and adherence to IS 14842.

IS 14842 references several key Indian Standards related to coir veneer board testing and specifications. Here is a concise summary of the List of Referenced Indian Standards (Annex A, Clause 2):

Key Notes:

• These standards cover testing methods for density, moisture, water resistance, and biological durability (mycological test).
• They also specify dimensions, tolerances, and coir fibre specifications.
• The BIS Certification Mark usage is governed by the BIS Act, 1986 (Clause 12.3.1).

Typical formula for moisture content (from IS 1734 Part 1):

[ \text{Moisture Content (%)} = \frac{W_{\text{wet}} - W_{\text{dry}}}{W_{\text{dry}}} \times 100 ]

Where:

• (W_{\text{wet}}) = weight of the sample before drying
• (W_{\text{dry}}) = weight of the sample after drying

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

IS 14842: Test Method for Squareness & Edge Straightness of Coir Veneer Board

Key Specifications:

• Tolerance on finished board sizes (Clause 8.4):

• Edge Straightness & Squareness Tolerance:

Test Procedure (Annex B & Clause B-1.1, B-2.1):

• Edge Straightness:

  • Use a straightedge at least the full length of the board.
  • For convex edges, position to have equal gaps at both ends.
  • Measure the largest gap (mm) between the edge and straightedge.

• Squareness:

  • Use a 1200 mm × 1200 mm square.
  • Apply one arm of the square to the board edge.
  • Measure the maximum gap between the board edge and square arm.

Summary Diagram:

graph LR
A[Coir Veneer Board] --> B[Check Edge Straightness]
B --> C[Place Straightedge along Edge]
C --> D[Measure max gap (mm)]

A --> E[Check Squareness]
E --> F[Use 1200x1200 mm Square]
F --> G[Apply square arm to board edge]
G --> H[Measure max gap (mm)]

Note: All measurements to be recorded to the nearest millimeter. The tolerances ensure quality control for dimensional accuracy and fit.

IS 14842: Method of Test for Glue Shear Strength of Coir Veneer Board

Test Setup (Clause 3.1 & Annex C)

• Specimen gripped symmetrically at two ends.
• Distance between notches and gripping jaws: 10 mm to 20 mm.
• Load applied perpendicular to grain of central veneer.
• Measure specimen width and notch distance to nearest 0.025 cm.
• Pull applied along centerline of central veneer to induce shear.

Key Formula for Shear Area (A):

[ A = \text{Width of specimen} \times \text{Distance between notches} ]

Shear strength (N/mm²) = Load at failure (N) / Shear area (mm²)

Glue Shear Strength Requirements (Table 11.3)

Summary:

• Test in dry, mycological, and water resistance conditions.
• Ensure minimum average and individual shear strengths per grade.
• Use precise specimen preparation and loading as specified.

flowchart LR
    A[Prepare Specimen] --> B[Measure Width & Notch Distance]
    B --> C[Clamp Specimen Symmetrically]
    C --> D[Apply Load Perpendicular to Grain]
    D --> E[Record Load at Failure]
    E --> F[Calculate Shear Strength]
    F --> G{Compare with Table 11.3 Values}

This ensures compliance with IS 14842 glue shear strength testing.