Bamboo mat veneer composite for general purposes -Specification

IS 14588: Scope & Key Specifications for Bamboo Mat-Veneer Composite

Scope (Clause 10.1 & 9.1)

• Covers general requirements for bamboo mat-veneer composites used for general purposes.
• Specifies test specimen preparation for quality control and testing.

Dimensions (Clause 6.2)

Standard sizes of bamboo mat-veneer composite sheets are:

Squareness Check (Clause 2.1)

• Use a 1200 mm × 1200 mm square.
• Apply one arm to plywood; measure max gap to check squareness.

Summary Table for Dimensions

This ensures uniformity in size and quality for bamboo mat-veneer composites under IS 14588.

IS 14588 - Definitions Summary

• Reference Standards for Definitions:
  Definitions in IS 14588 refer to those in:

  • IS 707: Specification for cement concrete flooring tiles
  • IS 6874: Specification for vitrified tiles
  • IS 13958: Specification for ceramic tiles

• Additional Clause (6.3 Note):

  • Dimensions such as length, width, and thickness can be customized as mutually agreed between the manufacturer and purchaser.

• Test Specimen (Clause 9.1):

  • Test specimens must comply with the general requirements and dimensions specified or agreed upon.

Key Points:

This approach ensures flexibility while maintaining standardization through referenced IS codes.

flowchart LR
    A[IS 14588 Definitions] --> B[IS 707]
    A --> C[IS 6874]
    A --> D[IS 13958]
    A --> E[Custom Dimensions]
    E --> F[Agreed by Manufacturer & Purchaser]

IS 14588 - Materials: Key Specifications for Bamboo Mat-Veneer Composite

1. Modulus of Rupture (MOR) & Modulus of Elasticity (MOE) (Clause 9.6)

• Test specimens: 3 per sample, per IS 1734 (Part 11):1983.
• Testing method: Static bending strength as per IS 1734 (Part 11).

2. Test Specimen Requirements (Clause 9.1)

• Specimens must meet minimum strength values:
  • MOR ≥ 1.2 N/mm²
  • MOE ≥ 0.9 N/mm²

3. Testing Reference

• IS 1734 (Part 11): 1983 — Method for static bending strength testing of plywood, applicable here for bamboo composites.

Summary:

• Use 3 specimens for MOR and MOE.
• Ensure average MOR ≥ 30 N/mm² and MOE ≥ 3000 N/mm².
• Individual values should not fall below 27 N/mm² (MOR) and 2700 N/mm² (MOE).

flowchart LR
    A[Sample Collection] --> B[Test Specimens (3)]
    B --> C[Static Bending Test per IS 1734 (Part 11)]
    C --> D{Results}
    D --> |Average| E[MOE ≥ 3000 N/mm²]
    D --> |Average| F[MOR ≥ 30 N/mm²]
    D --> |Min Individual| G[MOE ≥ 2700 N/mm²]
    D --> |Min Individual| H[MOR ≥ 27 N/mm²]

This ensures the bamboo mat-veneer composite meets structural performance standards.

IS 14588: Manufacture of Bamboo Mat-Veneer Composite (Bamboo Mat-Veneer Board)

Key Specifications & Tolerances (Clause 6.3 & related)

• Dimensions:

  • Standard thickness:
    • Less than 6.0 mm
    • 6.0 mm and above
  • Tolerance on thickness: 2 mm per 1000 mm length
  • Edge straightness tolerance: 2 mm per 1000 mm length

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

Test Specimen (Clause 9.1)

• Specimen preparation details must conform to standard testing requirements to ensure consistent quality.

Workmanship and Finish (Clause 7)

• Surface finish and workmanship should ensure uniformity, smoothness, and absence of defects.

Summary Table of Dimension Tolerances

This ensures dimensional accuracy and quality control during manufacture.

IS 14588: Workmanship and Finish Key Points

1. Surface Finish (Clause 7.2)

• Bamboo mats used on composite faces must be smooth and uniform in color.
• Sampling and conformity criteria follow IS 7638 (BWR grade plywood as per IS 303).

2. Dimensional Tolerances (Clause 6.4, Table 6.4)

3. Edge & Squareness Limits

• Maximum deviation: 2 mm per 1000 mm length for both edge straightness and squareness.

Visual Summary:

flowchart TD
    A[Finished Composite Board] --> B[Length Tolerance: +6/-0 mm]
    A --> C[Width Tolerance: +3/-0 mm]
    A --> D[Thickness Tolerance]
    D --> D1[<6.0 mm: ±10%]
    D --> D2[≥6.0 mm: ±5%]
    A --> E[Squareness: 2 mm/1000 mm]
    A --> F[Edge Straightness: 2 mm/1000 mm]

Ensure smooth surface finish and adherence to these dimensional tolerances for quality compliance.

IS 14588: Dimensions and Tolerances for Bamboo Mat-Veneer Composite Boards

1. Standard Dimensions (Clause 6.2)

• Standard sizes (mm):
  • 2440 × 1220
  • 2140 × 1220
  • 1840 × 1220
  • 2140 × 920
  • 1840 × 920

2. Tolerances on Nominal Sizes (Clause 6.4)

3. Notes (Clause 6.3)

• Other dimensions may be agreed upon between manufacturer and purchaser.

Summary Formula for Thickness Tolerance:

[ \text{Tolerance} = \begin{cases} \pm 10% & \text{if thickness} < 6.0 \text{ mm} \ \pm 5% & \text{if thickness} \geq 6.0 \text{ mm} \end{cases} ]

flowchart TD
    A[Nominal Dimensions] --> B[Length: +6/-0 mm]
    A --> C[Width: +3/-0 mm]
    A --> D[Thickness]
    D --> D1[< 6.0 mm: ±10%]
    D --> D2[≥ 6.0 mm: ±5%]
    A --> E[Squareness: 2 mm / 1000 mm]
    A --> F[Edge Straightness: 2 mm / 1000 mm]

This ensures quality control in manufacturing and installation of bamboo mat-veneer composites.

IS 14588: Sampling and Test Specimens Key Points

1. Test Specimen Preparation (Clause 9.1)

• Specimen size:

  • For boards with bamboo mat faces: as per IS 1734 (Part 4).
  • For other boards: 50 mm × 50 mm in full thickness.

• Specimens must be cut from different board positions (Clause 9.1.1).

2. Modulus of Rupture (MOR) & Modulus of Elasticity (MOE) (Clause 9.6)

• Number of specimens: 3 per sample, drawn per IS 1734 (Part 11).
• Tests conducted as per IS 1734 (Part 11) static bending strength method.
• Acceptance criteria (Table 1):

3. Sampling & Surface Quality (Clause 7.2)

• Bamboo mat faces must be smooth and uniform in color.
• Sampling and conformity criteria follow IS 7638 (for BWR grade plywood).

Summary Diagram: Specimen Preparation & Testing Flow

flowchart TD
    A[Select Board Sample] --> B[Cut Specimens (50x50 mm or per IS 1734)]
    B --> C[Prepare 3 Specimens per Sample]
    C --> D[Test MOR & MOE per IS 1734 (Part 11)]
    D --> E[Check Values Against Table 1]
    E --> F{Values Meet Criteria?}
    F -- Yes --> G[Accept Sample]
    F -- No --> H[Reject Sample]

For detailed test methods, refer to IS 1734 (Part 4 & 11) and IS 7638 for sampling protocols.

IS 14588: Test Methods Key Points

1. Test Specimen (Clause 9.1)

• Specimens for testing are prepared as per IS 1734 (Part 11): 1983.
• Three specimens per sample for MOR and MOE tests.

2. Modulus of Rupture (MOR) and Modulus of Elasticity (MOE) (Clause 9.6)

• MOR and MOE determined as per IS 1734 (Part 11).
• Average and minimum individual values must meet or exceed above.

3. Surface Strength Test (Clause 9.5)

• Includes wet state testing (Clause 9.5.2) to assess durability under moisture.

4. Edge Straightness and Squareness (Annex C)

• Procedure for measuring edge straightness and squareness to ensure dimensional accuracy.

Summary Formula for MOR and MOE (from IS 1734 Part 11):

• MOR = (\frac{3PL}{2bd^2})
• MOE = (\frac{PL^3}{4bd^3y})

Where:

• (P) = Load at failure (N)
• (L) = Span length (mm)
• (b) = Width of specimen (mm)
• (d) = Thickness of specimen (mm)
• (y) = Deflection at load (P) (mm)

flowchart TD
    A[Test Specimen Preparation] --> B[Three Specimens per Sample]
    B --> C[Perform MOR & MOE Tests]
    C --> D{Check Values}
    D -->|Average ≥ Specified| E[Pass]
    D -->|Minimum Individual ≥ Specified| E
    D -->|Fail| F[Reject Sample]

References:

• IS 14588: Clause 9
• IS 1734 (Part 11): 1983 for test procedures

IS 14588 - Mechanical Properties (Clause 9.6)

Key Specifications for Modulus of Rupture (MOR) & Modulus of Elasticity (MOE):

• Test Method:
  Follow IS 1734 (Part 11): 1983 for specimen preparation and testing.

• Specimens:
  Three specimens per sample for MOR and MOE tests.

Table 1: Average and Minimum Values

Notes:

• Use failing loads of specimens with material failure only for averaging.
• Internal Bond Strength (dry state) per Clause 9.4.1:
  • Average ≥ 9.0 N/mm²
  • Minimum individual ≥ 7.0 N/mm² (tested per IS 2380 Part 22)

Summary:

• Ensure MOE ≥ 2700 N/mm² (min individual) and MOR ≥ 27 N/mm² (min individual).
• Follow IS 1734 (Part 11) for static bending strength testing.
• Use average and minimum values for quality control.

flowchart TD
    A[Sample Preparation] --> B[Test 3 Specimens for MOR & MOE]
    B --> C[Calculate MOR & MOE per IS 1734 (Part 11)]
    C --> D{Values Meet Criteria?}
    D -- Yes --> E[Accept Material]
    D -- No --> F[Reject Material]

This ensures plywood meets strength and stiffness requirements per IS 14588.

IS 14588 - Marking and Certification for Bamboo Mat-Veneer Composite

Key Specifications (Clause 10.1 & 10.2)

Each bamboo mat-veneer composite must be legibly and indelibly marked with:

• Source of manufacture
• Year of manufacture
• Batch number

The product may bear the BIS Standard Mark as per Clause 10.2, subject to the Bureau of Indian Standards Act, 1986 regulations.

Certification Marking (Clause 10.2.1)

• Use of the Standard Mark is governed by BIS Act and licensing rules.
• Manufacturers must obtain licence conditions from BIS.
• Compliance with Eco-Mark requirements is mandatory, with documentary evidence provided to BIS.

Referenced Standards (Annex A)

Timber Species for Veneer (Annex B)

• Includes species like Artocarpus hirsutus (AIN), Terminalia arjuna (ARJ), Diospyros spp. (EBO), Dalbergia latifolia (ROS), Tectona grandis (TEA), etc.
• Species marked with † require treatment.

flowchart TD
    A[Manufacture Bamboo Mat-Veneer Composite] --> B[Mark with Source, Year, Batch No.]
    B --> C{Apply for BIS Licence?}
    C -->|Yes| D[Use BIS Standard Mark]
    C -->|No| E[No BIS Mark]
    D --> F[Submit Documentary Evidence for Eco-Mark]
    F --> G[Certification Granted by BIS]

Summary:
Mark bamboo mat-veneer composites with manufacturer info, batch, and year. Use BIS Standard Mark only after licensing

IS 14588: List of Referenced Indian Standards (Annex A)

This standard references key IS codes related to timber, plywood, bamboo mat-veneer composites, and related test methods:

Additional Notes:

• These referenced standards cover manufacture, testing, preservation, and specifications for plywood, bamboo composites, and timber.
• For rounding off test values, IS 2:1960 rules apply.
• Bamboo mat-veneer composite uses these standards for quality and performance benchmarks.

Timber Species for Veneer (Annex B) - Sample List

IS 14588: Timber Species of Veneer - Key Points

Timber Species (Annex B, Clause 4.3)

• Any timber species may be used for veneers.
• Annex B lists 84 species with trade and botanical names, e.g.:
  • Aini (Artocarpus hirsutus) - AIN
  • Teak (Tectona grandis) - TEA
  • Silver Oak (Grevillea robusta) - SOA
  • Species marked with † require treatment (Clause 5.2.1).

Veneer Quality & Treatment (Clauses 5.2.1 & 5.3)

• Veneers must be rotary cut or sliced.
• Surface smoothness is essential for adhesive spread.
• Quality must conform to IS 303 Table 1 & Table 2 for defect limits.
• Thickness uniformity: ±5% tolerance.
• Treatment (e.g., preservation) required for certain species at veneer stage.

Reference Standards (Annex A)

• IS 303: Specification for plywood (general purposes).
• IS 401: Timber preservation.
• IS 1734 (Part 4): Glue shear strength test for plywood.
• IS 2380 (Parts 5 & 22): Tests for wood particle boards.
• IS 12120: Preservation of plywood and panel products.

Summary Table: Veneer Thickness Tolerance

Diagram: Veneer Production & Quality Control Flow

flowchart TD
    A[Timber Species Selection] --> B[Veneer Cutting (Rotary/Sliced)]
    B --> C[Surface Smoothness Check]
    C --> D[Thickness Measurement (±5% tolerance)]
    D --> E[Defect Inspection (per IS 303)]
    E --> F{Treatment Required?}
    F -- Yes --> G[Veneer Preservation Treatment]
    F -- No --> H[Final Quality Approval]

This ensures compliance with IS 14588 for veneer manufacturing and quality control.

IS 14588: Method of Test for Edge Straightness and Squareness

1. Edge Straightness Test (Clause 1.1, Annex C)

• Use a straight edge at least the full length of the plywood.
• Place plywood edge against the straight edge.
• If the edge is convex, hold it so gaps at both ends are approximately equal.
• Measure the largest gap (mm) between the edge and straight edge.
• Record this gap as the straightness deviation.

2. Squareness Test (Clause 6.4, Annex C)

• Squareness tolerance is 2 mm per 1,000 mm of length or width.
• Check the angle between edges using a square or protractor.
• Deviation beyond tolerance indicates unsatisfactory squareness.

3. Tolerances Summary (Clause 6.4 Table 6.4)

Formula for allowable deviation:

[ \text{Max deviation} = \frac{2 \text{ mm}}{1000 \text{ mm}} \times \text{board length or width (mm)} ]

flowchart LR
    A[Start] --> B[Place plywood edge against straight edge]
    B --> C{Edge convex?}
    C -- Yes --> D[Hold with equal gaps at ends]
    C -- No --> E[Measure max gap between edge and straight edge]
    D --> E
    E --> F[Record gap as straightness deviation]
    F --> G[Check squareness with square]
    G --> H{Deviation ≤ 2 mm/1000 mm?}
    H -- Yes --> I[Pass]
    H -- No --> J[Fail]

Summary: Use a full-length straight edge to measure gaps for edge straightness; use a square to check squareness. Both must comply with 2 mm per 1,000 mm tolerance.

IS 14588: Mycological Test Procedure Summary

Test Purpose

Evaluate resistance of glue lines in plywood to microbial attack.

Specimen Preparation

• Six test specimens prepared as per:
  • Clause 9.1.1(b) or IS 1734 (Part 4)
• Specimens exposed to microorganisms following Annex C method.

Test Method (Annex C)

• Specimens subjected to controlled microbial attack.
• After exposure, specimens tested for glue shear strength as per:
  • IS 2380 (Part 5) or IS 1734 (Part 4).

Acceptance Criteria (Clause 9.3.3)

Key Points

• Six specimens tested.
• Report average and individual glue shear strength.
• Ensures durability of glue line against fungal degradation.

flowchart TD
    A[Prepare 6 Specimens] --> B[Expose to Micro-organisms (Annex C)]
    B --> C[Test Glue Shear Strength (IS 2380 Pt 5 / IS 1734 Pt 4)]
    C --> D{Check Strength}
    D -->|≥ 1000 N (avg) & ≥ 800 N (ind)| E[Pass]
    D -->|< Criteria| F[Fail]

This test ensures plywood glue lines maintain structural integrity under microbial exposure.

IS 14588: Committee Composition - Key Points

• Committee Composition is detailed in Annex D (Foreword).
• The Wood Products Sectional Committee, CED 20 includes:
  • Chairman: Shri V. Sivananda (Indian Plywood Industries Research and Training Institute)
  • Members: Representatives from various organizations such as Public Works Departments, Forest Departments, Plywood Manufacturers' Associations, Technical Development Directorates, Packaging Institutes, Defence, Railways, and others.
  • Alternate Members are also appointed for most members.
• The committee ensures representation from:
  • Government departments
  • Industry associations
  • Research institutes
  • Defence and technical bodies
• Member-Secretary: Shri T. B. Narayanan (Joint Director, BIS)
• Subcommittee on Wood Based Building Boards is chaired by Dr. H. N. Jagadeesh with members from research and industry.

Summary Table: Committee Composition Highlights

This committee ensures comprehensive stakeholder representation for standard development in wood-based products under IS 14588.