Marine Plywood -Specification

IS 710: Scope Summary

IS 710 specifies requirements for plywood used in general engineering and construction. Key points include:

• General Requirements (Clause 10.1): Covers quality, type of timber, finish, and testing.

• Tender Samples (Clause 12): Three samples of minimum size 90 mm × 60 mm must be submitted.

• Species of Timber for Face Veneers (Table 1, Clause 4.1.1):

  Trade Name	Botanical Name	Marking Abbreviation
  Birch	Batula spp.	BIR
  Teak	Tectona grandis	TEA
  Rosewood	Dalbergia latifolia	ROS
  ...	...	...

• Mechanical Properties (Table 4, Clause 9.1.7):

  Property	Along Face Grain	Across Face Grain
  MOE (N/mm²) Average	3750	2000
  MOE Minimum Individual	3400	1800
  MOR (N/mm²) Average	25	15
  MOR Minimum Individual	22	13

• Preservative Retention (Clause 9.1.8): As per IS 2753.

• Edge Straightness & Squareness (Annex B): Verified using a straight edge and square with 500 mm arms.

• Referenced Standards (Annex A): Includes IS 287 (moisture content), IS 1734 (plywood tests), IS 2753 (preservatives), etc.

Summary Diagram: Scope Overview

graph TD
  A[IS 710 Scope] --> B[General Requirements]
  A --> C[Tender Samples]
  A --> D[Timber Species]
  A --> E[Mechanical Properties]
  A --> F[Preservative Retention]
  A --> G[Edge & Squareness Tests]
  A --> H[Referenced IS Standards]

This scope ensures plywood meets quality, mechanical, and durability standards for engineering use.

IS 710 - References: Key Specifications and Tables

1. Tender Samples (Clause 12):

   • Submit 3 samples, each ≥ 90 mm × 60 mm.
   • Samples define timber type, quality, and finish.

2. Species of Timber for Face Veneers (Table 1, Clause 4.1.1):

   Trade Name	Botanical Name	Marking Abbreviation
   Birch	Batula spp.	BIR
   Teak	Tectona grandis	TEA
   Rosewood	Dalbergia latifolia	ROS
   Mahogany	Swietenia spp.	MAO
   Sissoo	Dalbergia sissoo	SIS
   ...	...	...

3. Moisture Content (IS 287:1993):

   • Permissible moisture content varies by timber use (refer IS 287 for details).

4. Tests & Methods (IS 1734 series):

   • Tensile Strength (Part 9)
   • Static Bending Strength (Part 11)
   • Density & Moisture Content (Part 1)
   • Glue Shear Strength (Part 4)

5. Edge Straightness & Squareness (Annex B):

   • Check edges with a straight edge (full length).
   • Use a 500 mm square for squareness; record max gap.

6. Adhesive Content (Clause 4.2.1):

   • Solid content of glue ≤ 10% by mass.

Summary Diagram: Timber Veneer Marking Process

flowchart TD
    A[Select Timber Species] --> B[Check Botanical Name]
    B --> C[Assign Marking Abbreviation]
    C --> D[Prepare Samples (≥90x60 mm)]
    D --> E[Submit for Tender]
    E --> F[Testing per IS 1734 Series]
    F --> G[Mark Certified Timber]

For detailed preservative methods, sampling, and test procedures, refer to the IS standards listed in Annex A of IS 710.

IS 710 - Definitions & Key Specifications

1. Species of Timber for Face Veneers (Table 1, Clause 4.1.1)

(Refer to IS 710 Table 1 for full list)

2. Adhesive Content (Clause 4.2.1)

• Adhesive solid content shall not exceed 10% by mass of the glue.

3. Tender Sample (Clause 12)

• Three samples of minimum size 90 mm × 60 mm must be submitted.
• Samples represent the standard for timber type, quality & finish.

4. Edge Straightness & Squareness (Annex B)

• Edge straightness: Measured against a straight edge equal to plywood length; max gap recorded in mm.
• Squareness: Checked with a 500 mm square; max gap recorded.

5. References to Related IS Standards (Annex A)

• IS 287: Permissible moisture content of timber.
• IS 1734 (Parts 1,4,5,7,9,11): Methods of test for plywood.
• IS 2753

IS 710: Key Specifications & Tables for Materials

1. Tensile Strength (Clause 9.1.4)

• Determined as per IS 1734 (Part 9).
• Must comply with specified minimum tensile strength values (refer IS 1734 for exact values).

2. Adhesive Content (Clause 4.2.1)

• Solid content of glue used shall not exceed 10% by mass.

3. Species of Timber for Face Veneers (Table 1, Clause 4.1.1)

(Refer full table for all species)

4. Wet Bending Strength (Clause 9.1.7 & Table 3)

• Test: 3 cycles of boiling (4h) + drying (16h) or 72h boiling.
• Then soak 1h at 27 ± 2℃ before testing (IS 1734 Part 11).
• Minimum Modulus of Elasticity (MOE) & Modulus of Rupture (MOR):

IS 710: Manufacture and Workmanship Key Points

1. Tolerances on Finished Boards (Clause 6.3)

• Edge straightness and squareness tested as per Annex B.

2. Workmanship and Finish (Clause 7 & 11.2.1)

• Standard Mark usage governed by BIS Act, 1986.
• Tender samples: 3 samples, minimum size 90 mm × 60 mm.
• Veneers for faces must be free from sapwood; core veneers may have sound knots ≤ 50 mm.
• No dead knots, overlaps, or pleats allowed.

3. Testing Methods (Annex B)

• Edge Straightness: Use a straight edge equal to board length; measure max gap.
• Squareness: Use 500 mm square; measure max gap between square and plywood edge.

4. Additional References

• Moisture content, preservative retention per IS 287, IS 2753.
• Mechanical properties (MOE, MOR) specified in Table 4 (Clause 9.1.7).

Summary Diagram: Edge Straightness & Squareness Testing

flowchart TD
    A[Place plywood on flat surface]
    B[For Edge Straightness]
    C[Use straight edge of board length]
    D[Measure max gap between edge and straight edge]
    E[For Squareness]
    F[Use 500 mm square]
    G[Apply one arm to plywood edge]
    H[Measure max gap between square and edge]

    A --> B --> C --> D
    A --> E --> F --> G --> H

This ensures quality control in manufacture and workmanship per IS 710.

IS 710: Dimensions and Tolerances for Plywood Boards

1. Nominal Dimensions (Clause 6.1)

• Standard sizes (Length × Width in mm):
  • 2400 × 1200
  • 2100 × 1200
  • 1800 × 1200
  • 2100 × 900
  • 1800 × 900

2. Tolerances on Dimensions (Clause 6.3, Table 6.3)

• Edge Straightness & Squareness tested per Annex B:
  • Use a straight edge equal to board length.
  • Squareness checked with a 500 mm square.

3. Testing Procedures (Annex B)

• Edge Straightness: Measure max gap between edge and straight edge.
• Squareness: Measure max gap between square arm and board edge.

Summary Table for Quick Reference

This ensures plywood boards meet dimensional accuracy for quality and fitment in construction.

flowchart LR
    A[Plywood Board] --> B{Check Dimensions}
    B --> C[Length ±6 mm]
    B --> D[Width +3/-0 mm]
    B --> E[Thickness ±10% (<6mm)]
    B --> F[Edge Straightness ≤ 2 mm

IS 710: Workmanship and Finish - Key Specifications & Tolerances

1. Dimensional Tolerances (Clause 6.3, Table 6.3)

Edge straightness and squareness tested as per Annex B.

2. Workmanship & Finish (Clause 7.5)

• Finish: Reasonably smooth surface.
• Sanding: Both sides if purchaser requires.
• Veneers: Face veneers free from sapwood; core veneers may have sound knots ≤ 50 mm.
• No dead knots, overlaps, or pleats allowed.

3. Veneer Defects (Clause 5.1.1)

• Sound knots allowed in core veneers (≤ 50 mm).
• Open defects (split/check) allowed if surface finish not impaired.
• Dead knots and overlaps prohibited.

4. Testing Methods (Annex B)

• Edge Straightness: Use a straight edge equal to board length; measure max gap.
• Squareness: Use 500 mm square; measure max gap at corners.

Summary Diagram of Tolerances

graph TD
    A[Finished Board] --> B[Length +6 mm]
    A --> C[Width +3/-0 mm]
    A --> D[Thickness <6mm ±10%±5%]
    A --> E[Edge Straightness ≤ 2 mm/1000 mm]
    A --> F[Squareness ≤ 2 mm/1000 mm]

References:

• Annex B: Edge straightness & squareness test methods.
• Clause 7.5: Surface finish requirements.
• Clause 5.1.1: Veneer defect limits.

IS 710: Marking Specifications for Plywood

Clause 11.1: Mandatory Marking on Each Plywood Board

• Manufacturer's name, initials or trademark
• Year of manufacture
• Timber species abbreviations (see Table 1 below)
• Batch number
• ECO-Mark criteria (if applicable)

Clause 11.2: BIS Certification Marking

• Standard Mark usage governed by BIS Act 1986
• License conditions available from BIS

Table 1: Timber Species Abbreviations for Marking (Face Veneers)

Additional Notes:

• Marking must be legible and indelible.
• Marking size and location should be as per purchaser's requirement.
• Tender samples: minimum **90

IS 710: Tests and Test Methods - Key Points

1. Tender Samples (Clause 12)

• Submit 3 samples, minimum size 90 mm × 60 mm.
• Samples define standard for timber type, quality, and finish.

2. Test Standards Referenced (Annex A)

• Moisture content: IS 287:1993
• Preservative estimation: IS 2753 (Part 1:1991)
• Plywood tests: IS 1734 (Parts 1,4,5,7,9,11 - 1983)
• Wood preservatives: IS 10013 series

3. Edge Straightness & Squareness (Annex B)

• Edge straightness: Measure max gap against a straight edge equal to plywood length.
• Squareness: Use a 500 mm square; record max gap between square and plywood edge.

4. Water Resistance Test (Annex C)

• Vacuum steam pressure test with pure water at vacuum of 110 ± 10 kPa.
• Test specimens placed airtight, vacuum applied, steam release valve closed.

5. Wet Bending Strength (Clause 9.1.7 & Table 3)

Test cycle: 3 cycles of 4h boiling + 16h drying at 65 ± 2℃ or 72h boiling, then 1h water soak at 27 ± 2℃ before testing.

flowchart LR
    A[Tender Samples] --> B[Testing per IS 1734]
    B --> C[Edge Straightness & Squareness]
    B --> D[Water Resistance Test]
    B --> E[Wet Bending Strength Test]
    E --> F[MOE & MOR per Table 3]
``

IS 710: Additional Requirements for ECO-Mark (Clause 10)

• Environmental Compliance:

  • Manufacturer must submit environmental consent clearance from the State Pollution Control Board per Water Acts (1974, 1977) and Air Act (1981).
  • Authorization under Environment (Protection) Act, 1986, if applicable, must be provided.

• Certification:

  • Documentary evidence (certificate/declaration) must be submitted to BIS when applying for ECO-Mark.

• ECO-Mark Labeling:

  • ECO-Mark is a combined BIS Standard Mark + ECO logo.
  • It is optional; manufacturers may opt for ISI Mark alone or with ECO-Mark.

• Basis:

  • ECO-Mark criteria align with Gazette Notification No. 170 (18 May 1996) for wood substitutes as environment-friendly products.

• Quality Parameters:

  • Must meet all relevant IS 710 clauses plus environmental criteria.
  • For mechanical properties (MOE & MOR), refer Table below:

flowchart LR
    A[Manufacturer] --> B[Environmental Clearance]
    B --> C[Submit to BIS]
    C --> D{Apply for ECO-Mark?}
    D -->|Yes| E[Submit Certificate & Declaration]
    D -->|No| F[Apply for ISI Mark only]
    E --> G[Product Tested per IS 710]
    G --> H[Meets ECO-Mark Criteria]
    H --> I[Receive ECO-Mark Label]

Summary: To qualify for ECO-Mark, plywood must meet IS 710 mechanical and preservative standards, environmental clearances, and submit appropriate documentation to BIS.

IS 710 - Certification Marking Key Points

Clause 11.2: BIS Certification Marking

• Use of Standard Mark governed by BIS Act, 1986 and related rules.
• Licence for use granted by Bureau of Indian Standards (BIS).

Clause 11.1: Marking on Plywood Boards Each plywood board must be legibly and indelibly marked with:

• Manufacturer's name/trademark
• Year of manufacture
• Timber species abbreviations (see Tables 1 & 2 in IS 710)
• Batch number
• ECO-Mark criteria (if applicable)

Clause 12: Tender Samples

• Submit 3 samples minimum size 90 mm × 60 mm.
• Samples define standard for timber type, quality, and finish.

Summary Table for Marking Details

Additional Notes:

• ECO-Mark requires documentary proof submitted to BIS.
• Standard Mark use is strictly regulated by BIS licensing.

flowchart TD
    A[Manufacturer] --> B[Apply for BIS Licence]
    B --> C[Use Standard Mark on Plywood]
    C --> D[Mark Board with Required Details]
    D --> E[Submit Tender Samples if required]
    E --> F[Samples Define Quality Standard]

This ensures traceability, quality, and compliance with IS 710 and BIS norms.

IS 710: Tender Sample Specifications

• Sample Size:

  • Three samples required
  • Each sample size ≥ 90 mm × 60 mm

• Purpose:

  • Samples define the standard for timber type, quality, and finish if the tender is accepted.

Related Key Tables & Specifications from IS 710:

Quick Reference: Minimum MOE & MOR (Wet Bending Strength)

Summary Diagram: Tender Sample Process

flowchart LR
    A[Tender Requirement] --> B[Supplier submits 3 samples]
    B --> C[Each sample ≥ 90mm x 60mm]
    C --> D{Tender Accepted?}
    D -- Yes --> E[Samples define standard for timber type, quality, finish]
    D -- No --> F[Samples rejected]

Note: Samples must comply with IS 710 veneer quality, species, and preservative retention standards to be accepted as tender benchmarks.

IS 710 refers extensively to other Indian Standards for timber and plywood. Here is a concise list of key referred IS codes with their focus:

Key Specifications:

• Tender Samples: 3 samples, each ≥ 90 mm × 60 mm (Clause 12)
• Edge Straightness: Measured against a straight edge equal to plywood length (Annex B)
• Square-ness: Checked with a 500 mm square (Annex B)
• Water Resistance Test: Vacuum steam pressure test at 110 ± 10 kPa (Annex C)

These referenced standards provide detailed test methods, definitions, and preservative specifications essential for timber and plywood quality control.

graph TD
    A[IS 710] --> B[IS 287: Moisture Content]
    A --> C[IS 707: Glossary]
    A --> D[IS 1734: Plywood Tests]
    A --> E[IS 2753: Preservative Estimation]
    A --> F[IS 7638: Sampling]
    A --> G[IS 10013: Wood Preservatives]

IS 710 - Method of Test for Edge Straightness and Squareness (Annex B)

Edge Straightness (Clause 6.3 & Annex B-1)

• Use a straight edge at least equal to the full length of the plywood.
• Place the plywood edge against the straight edge.
• If the edge is convex, position it to have approximately equal gaps at both ends.
• Measure the maximum gap (deviation) between the plywood edge and the straight edge to the nearest mm.
• Tolerance: Max 2 mm per 1000 mm length (0.2%).

Squareness (Clause 6.3 & Annex B-2)

• Use a square with 500 mm arms.
• Place one arm along the plywood edge.
• Measure the maximum gap between the other arm and the adjacent edge.
• Tolerance: Max 2 mm per 1000 mm length (0.2%).

Summary Table of Tolerances (Clause 6.3)

Visual Concept (Mermaid Diagram)

flowchart LR
    A[Place Plywood Edge] --> B[Against Straight Edge]
    B --> C{Edge Convex?}
    C -- Yes --> D[Adjust for Equal Gaps]
    C -- No --> E[Measure Max Gap]
    D --> E
    E --> F[Record Max Gap ≤ 2 mm/1000 mm]

    G[Check Squareness] --> H[Place Square Arm on Edge]
    H --> I[Measure Gap on Adjacent Edge]
    I --> J[Record Max Gap ≤ 2 mm/1000 mm]

Note: Follow IS 7638 for sampling procedures and ensure measurements are precise to maintain quality control.

IS 710: Alternate Method for Water Resistance Test (Clause 9.1.3 & 9.1.7)

Key Specifications & Procedure

• Specimens:
  • Six pieces approx. 250 mm × 100 mm with face veneer grain parallel to length (IS 1734 Part 5).
• Test Method (Clause 9.1.3.1):
  • Submerge specimens in boiling water for 72 hours (continuous or cumulative with cold water intervals).
  • Cool immediately in cold water to room temperature.
  • Test specimens in wet condition as per IS 1734 (Part 11).

Alternate Accelerated Cyclic Test (Clause 9.1.7)

• 3 cycles:
  • Each cycle = 4 h boiling + 16 h drying at 65 ± 2°C oven, or
  • Continuous 72 h boiling.
• After cycles, keep in water at 27 ± 2°C for 1 h, then test.
• Modulus of Elasticity (MOE) and Modulus of Rupture (MOR) must meet values from Table below.

Minimum MOE and MOR Values (N/mm²)

Summary Flowchart of Alternate Water Resistance Test

flowchart TD
    A[Cut Specimens 250x100 mm] --> B[Boil for 4h]
    B --> C[Dry in Oven 16h at 65±2°C]
    C --> D{Repeat 3 Cycles?}
    D -- Yes --> B
    D -- No --> E[Soak in Water 1h at 27±2°C]
    E --> F[Test for MOE & MOR as per IS 1734]
    F --> G[Check Against Table 3 Values]

This method accelerates water resistance evaluation with cyclic boiling and drying, ensuring plywood meets durability and strength criteria