Specification for decorative plywood using a plurality of veneers for decorative faces

IS 7316: Scope - Key Specifications & Tables

• Scope Reference Standards:
  Definitions and timber classifications as per:

  • IS 707:1976 (Wood seasoning)
  • IS 1328:1982 (Timber classification)
  • IS 303:1989 (Timber classes I, II, III)

• Dimensional Tolerances (Clause 7.3.1):

  Dimension	Size Limit	Tolerance (mm)
  Length	≤ 120 cm	+3 / -0
  	> 120 cm	+6 / -0
  Width	≤ 90 cm	+3 / -0
  	> 90 cm	+6 / -0

• Sampling (Clause 11.2):
  Number of boards/sheets for quality check depends on lot size (see Table 1 in IS 7316).

• Terminology Updates:

  • Replace WWR with MR (Moisture Resistant)
  • Use updated IS codes for references as above.

This ensures compliance with dimensional accuracy and quality control for plywood and related products under IS 7316.

IS 7316: Definitions & Key Specifications

• Definitions:
  As per Clause 2.1, definitions used in IS 7316 refer directly to:

  • IS 707-1968 (Plywood definitions)
  • IS 1328-1970 (Veneers definitions)

• Sampling & Acceptance Criteria (Clause 11.2 & 11.4):

  No. of Boards/Sheets in Lot (N)	Sample Size (n)	Acceptance Number (a)
  Up to 300	5	0
  301 to 500	8	0
  501 to 1000	13	0
  1001 and above	20	1

• Testing:

  • All sample boards/sheets must be checked for dimensional accuracy, moisture content, and water resistance.
  • A board is defective if it fails any one of these tests.
  • The lot passes if defective count ≤ acceptance number.

• Note: The standard aligns with international practices for consistency and field relevance.

flowchart TD
    A[Lot of Boards/Sheets] --> B[Select Sample (n)]
    B --> C{Check each board for:}
    C --> D[Dimensional Requirements]
    C --> E[Moisture Content]
    C --> F[Water Resistance]
    D --> G{Pass or Fail?}
    E --> G
    F --> G
    G --> H[Count Defective Boards]
    H --> I{Defectives ≤ Acceptance Number?}
    I -- Yes --> J[Lot Accepted]
    I -- No --> K[Lot Rejected]

This summarizes the definitions, sampling, and acceptance criteria per IS 7316.

IS 7316: Grades and Quality Requirements for Veneered Decorative Plywood

Key Specifications:

• Grades: Selection per purchaser's option (Clause 4.3), based on timber class (IS 303:1989) and moisture resistance (MR grade).
• Testing: Boards tested for dimensional accuracy, moisture content, and water resistance (Clause 11.4).
• Defect Criteria: A board is defective if it fails any characteristic; lot acceptance depends on defective count ≤ acceptance number (Table 1, Clause 11.4).

Sampling (Clause 11.2):

• Number of samples depends on lot size, per Table 1 (not fully provided here).
• Acceptance number in Table 1 defines max defective boards allowed.

Rounding Off:

• Test results rounded per IS 2:1960 rules, matching significant digits of specified values (Clause 4.3).

Summary Table (Conceptual):

flowchart TD
    A[Lot of Boards] --> B[Select Samples (Table 1)]
    B --> C[Test Samples]
    C --> D{Any Defective Boards?}
    D -- No --> E[Lot Accepted]
    D -- Yes --> F{Defective ≤ Acceptance Number?}
    F -- Yes --> E
    F -- No --> G[Lot Rejected]

For exact values, refer to Table 1 in IS 7316 for sample size and acceptance numbers.

IS 7316: Materials - Key Formulas, Tables, and Specifications

1. Relevant Standards for Materials

• Timber Classification: As per IS 303:1989 (replaces IS 303:1960) for timber classes (Class I, II, III).
• Veneered Plywood: Conforms to specifications in IS 7316 with references to IS 707:1976 and IS 1328:1982 for related materials.

2. Sampling and Testing (Clause 11)

• Sampling Size & Acceptance Criteria:
  Number of boards/sheets to be sampled depends on lot size (see Table 1 in IS 7316).
  A lot is accepted if defective boards ≤ acceptance number (col 3 of Table 1).

• Tests on Samples:

  • Dimensional requirements
  • Moisture content
  • Water resistance test

• Defect Criteria:
  Any board failing any test is defective.

3. Rounding Off (Clause 4.3 & 0.5)

• Final test values rounded as per IS 2:1960.
• Number of significant digits retained should match the specified value.

Summary Table (Example Format from Table 1)

(Refer IS 7316 Table 1 for exact values)

Notes:

• "MR" (Moisture Resistant) replaces "WWR" in material designation.
• Purchasers may select options per clauses 4.1, 4.2, 4.3, and 5.5 to suit requirements.

flowchart TD
    A[Lot of Boards] --> B[Select Sample Size per Table 1]
    B --> C[Test Dimensional, Moisture, Water Resistance]
    C --> D{Defective Boards ≤ Acceptance Number?}
    D -- Yes --> E[Lot Accepted]
    D -- No --> F[Lot Rejected]

This concise framework helps ensure

IS 7316: Construction Requirements - Key Formulas, Tables & Specs

1. Testing & Conformity (Clause 11.4)

• Inspection: All boards/sheets checked for dimensional accuracy, moisture content, and water resistance.
• Defective Criteria: Any board failing any characteristic is defective.
• Acceptance: Lot accepted if defective boards ≤ acceptance number in Table 1 (not provided here).

2. Dimensional Tolerances (Clause 7.3.1)

3. Material Specifications

• Timber classes as per IS 303:1989.
• Moisture Resistance marked as MR (Moisture Resistant).
• Definitions per IS 707:1976 and IS 1328:1982.

Summary Diagram: Sample Testing & Acceptance Flow

flowchart TD
    A[Sample Boards] --> B{Check Dimensions}
    B -->|Pass| C{Test Moisture & Water Resistance}
    B -->|Fail| D[Defective Board]
    C -->|Pass| E[Conforming Board]
    C -->|Fail| D
    D --> F[Count Defective Boards]
    F --> G{Defective ≤ Acceptance Number?}
    G -->|Yes| H[Lot Accepted]
    G -->|No| I[Lot Rejected]

For detailed acceptance numbers and further construction specs, refer to Table 1 and clauses in IS 7316.

IS 7316: Surface Quality - Key Points & Specifications

Surface Quality Requirements (Clauses 6.3 & 8.3)

• Decorative veneer surface must be:
  • Selected for figure, texture, colour, and grain.
  • Free from manufacturing and wood defects except as permitted.
  • Matched or mismatched to achieve desired decorative effect.
• Decorative surface should be:
  • Smooth with the desired decorative pattern.
  • Have pleasing locks, texture, and feel.

Dimensional & Quality Conformity (Clause 11.4)

• Boards/sheets tested for:
  • Dimensional accuracy
  • Moisture content
  • Water resistance
• A board is defective if any characteristic fails.
• Lot acceptance based on acceptance number from Table 1 (not provided here).

Rounding Off (Clause 0.5)

• Test results rounded per IS 2:1960 rules.
• Maintain significant digits as per specified values.

Summary Table (Conceptual)

flowchart LR
    A[Select Veneer] --> B{Check Figure, Texture, Colour, Grain}
    B -->|Pass| C[Match/Mismatch Veneers]
    C --> D[Apply Decorative Surface]
    D --> E[Test for Dimensions, Moisture, Water Resistance]
    E --> F{Defects?}
    F -->|No| G[Accept Lot]
    F -->|Yes| H[Reject Board/Lot]

For exact acceptance numbers and detailed tables, refer to Table 1 of IS 7316.

IS 7316: Dimensions and Tolerances Summary

1. Length and Width Tolerances (Clause 7.3.1)

2. General Tolerances on Finished Boards (Clause 7.3)

3. Thickness Tolerance (Clause 7.3.2)

• Positive tolerance = 0.2 mm + 5% of nominal thickness

4. Edge Straightness

• Max deviation = 2 mm per 1000 mm (0.2%)

Notes:

• Squareness and edge straightness testing per Annex A.
• Thickness tolerance formula:

[ \text{Permitted thickness} = \text{Nominal thickness} \pm \left(0.2 \text{ mm} + 5% \times \text{Nominal thickness}\right) ]

flowchart TD
    A[Nominal Size] --> B{Dimension?}
    B -->|Length| C[+6 mm / -0 mm]
    B -->|Width| D[+3 mm / -0 mm]
    B -->|Thickness| E{Thickness < 6 mm?}
    E -->|Yes| F[±10%]
    E -->|No| G[±5% + 0.2 mm]

This concise table and formula set ensures compliance with IS 7316 tolerances for board dimensions.

IS 7316: Sampling and Inspection Key Points

Sampling Scale (Clause 11.2 & Table 1)

• Sample size (n) depends on lot size (N).
• Acceptance number (a) is max allowable defective boards in sample.

Sampling Method (Clause 11.2.1)

• Use simple random sampling per IS 4905-1968, Clause 3.1.
• Alternatively, systematic sampling per Clause 11.3.

Inspection & Testing (Clause 11.4)

• Inspect all sampled boards for:
  • Dimensional requirements
  • Moisture content
  • Water resistance
• A board is defective if it fails any test.
• Lot conforms if defective boards ≤ acceptance number.

flowchart TD
    A[Lot of Boards/Sheets] --> B[Select Sample Size (n) based on N]
    B --> C{Sampling Method}
    C -->|Simple Random| D[Select boards randomly]
    C -->|Systematic| E[Select boards systematically]
    D & E --> F[Inspect & Test all sample boards]
    F --> G{Number of Defectives ≤ Acceptance Number?}
    G -->|Yes| H[Lot Accepted]
    G -->|No| I[Lot Rejected]

This ensures statistically valid quality control per IS 7316.

IS 7316: Testing Methods - Key Formulas, Tables & Specifications

Sampling & Acceptance (Clause 11.2 & Table 1)

• Sample boards/sheets are selected based on lot size.
• Acceptance number (a): Maximum defective boards allowed in sample for lot acceptance.

Testing Requirements (Clause 11.4)

• Every sample board must be tested for:
  • Dimensional requirements
  • Moisture content
  • Water resistance
• A board failing any test is defective.
• Lot is accepted if defective count ≤ acceptance number.

Rounding Off (Clause 4.3 & 0.5)

• Test results must be rounded per IS 2-1960.
• Number of significant digits in results = number in specified values.

Summary Flowchart of Sampling & Testing

flowchart TD
    A[Start: Identify Lot Size] --> B{Lot Size (N)}
    B -->|≤300| C[Sample Size = 5]
    B -->|301-500| D[Sample Size = 8]
    B -->|501-1000| E[Sample Size = 13]
    B -->|>1000| F[Sample Size = 20]
    C --> G[Test all samples for Dimensions, Moisture, Water Resistance]
    D --> G
    E --> G
    F --> G
    G --> H{Number of Defective Boards ≤ Acceptance Number?}
    H -->|Yes| I[Lot Accepted]
    H -->|No| J[Lot Rejected]

Use this table and procedure to ensure conformity of plywood lots per IS 7316.

IS 7316: Inspection and Delivery - Key Points

1. Test Specimens Preparation (Clause 9.1.2.1)

• Prepare 3 specimens of size 15 x 15 cm from selected boards.
• Soak in water at room temperature for 48 hours.
• Dry at 65 ± 2°C for 8 hours.
• Repeat 2 cycles of soaking (16 hours) and drying (8 hours) under the same conditions.

2. Inspection (Clause 10.1)

• Visual check for:
  • Conformance of decorative veneered sides (per Clause 6).
  • Dimensions.
  • Delamination.
  • Blisters or surface defects.

3. Sampling and Acceptance (Clause 11.2, Table 1)

4. Criteria for Conformity (Clause 11.4)

• Inspect all sampled boards for dimensions, moisture content, and water resistance.
• A board is defective if it fails any characteristic.
• Lot is accepted if defective boards ≤ acceptance number.

Summary Flowchart of Inspection & Acceptance

flowchart TD
    A[Select Boards] --> B[Prepare 3 Specimens (15x15 cm)]
    B --> C[Water Soak 48 hrs]
    C --> D[Dry 8 hrs at 65±2°C]
    D --> E[2 Cycles: Soak 16 hrs + Dry 8 hrs]
    E --> F[Visual Inspection & Dimensional Check]
    F --> G[Sampling as per Table 1]
    G --> H[Test Moisture & Water Resistance]
    H --> I{Defective Boards ≤ Acceptance Number?}
    I -- Yes --> J[Lot Accepted]
    I -- No --> K[Lot Rejected]

This ensures quality compliance before delivery.

IS 7316: Lot Definition and Sampling Methods

Lot Definition (Clause 11.1.1)

• Samples must be selected and tested separately from each lot to verify conformity.

Sampling Scale & Acceptance (Clause 11.2 & Table 1)

• Acceptance number (a) = maximum allowed defective boards in the sample.
• If defective boards ≤ a, lot is accepted; otherwise rejected.

Sampling Methods (Clause 11.2.1)

• Simple Random Sampling as per IS 4905:1968 Clause 3.1.
• Alternatively, Systematic Sampling (Clause 11.3) can be used.

Summary:

• Define lot size.
• Select sample size from Table 1.
• Use random or systematic sampling.
• Accept lot if defectives ≤ acceptance number.

flowchart TD
    A[Define Lot Size] --> B[Determine Sample Size (Table 1)]
    B --> C[Select Samples (Random/Systematic)]
    C --> D[Test Samples]
    D --> E{Defectives ≤ Acceptance Number?}
    E -- Yes --> F[Accept Lot]
    E -- No --> G[Reject Lot]

IS 7316: Marking of Decorative Veneered Plywood

Key Points from Clause 12.1.1:

• Decorative veneered plywood may bear the BIS Standard Mark, indicating compliance with IS 7316.
• The Standard Mark assures:
  • Production under a strict system of inspection, testing, and quality control supervised by BIS.
  • Continuous conformity checks by BIS.
• Licence for use of the Standard Mark is granted under BIS rules (BIS Act, 1986).

Additional Relevant Specifications:

• Marking typically includes:
  • Manufacturer’s name or trademark
  • IS code number (IS 7316)
  • Grade and type of plywood
  • Batch or lot number
  • Date of manufacture

Tolerances on Dimensions (Clause 7.3.1):

Notes:

• "MR" (Moisture Resistant) replaces "WWR" in relevant clauses.
• Reference standards for timber and plywood: IS 303:1989, IS 707:1976, IS 1328:1982.

flowchart LR
    A[Manufacturer] --> B[Production under BIS supervision]
    B --> C[Quality Control & Testing]
    C --> D[Standard Mark on Plywood]
    D --> E[Assurance of IS 7316 compliance]
    E --> F[Continuous BIS conformity checks]

This flow ensures marked plywood meets IS 7316 quality and dimensional standards.

IS 7316: Particulars to be Supplied by Purchaser

Key Specifications to be Supplied (Clause 13 & related):

• Thickness options (Clause 7.2):

  • 3 mm, 4 mm, 5 mm, 6 mm, 9 mm, 12 mm, 19 mm, 25 mm
  • Note: Other dimensions (length, width, thickness) can be mutually agreed.

• Dimension tolerances:

  • Length and width as agreed between purchaser and manufacturer.
  • Squareness checked using a 1200 mm x 1200 mm square (Clause 2.1).

• Selection options (Clause 4.3):

  • Purchaser may select options per Clauses 4.1, 4.2, 4.3, and 5.5 to suit requirements.

• Rounding off test results (Clause 4.3 Note):

  • Follow IS 2:1960 for rounding off numerical values.
  • Retain significant places equal to specified values.

Summary Table: Standard Thicknesses

Important Notes:

• Standard Mark usage governed by BIS licensing (Clause 12.1.1).
• Purchaser must specify thickness and any special dimensions or options at order placement.

flowchart TD
    A[Purchaser] -->|Specify thickness & dimensions| B[Manufacturer]
    B -->|Produce plywood as per IS 7316| C[Quality Control]
    C -->|Testing & Inspection| D{Conforms to IS 7316?}
    D -->|Yes| E[Supply Product with BIS Mark]
    D -->|No| F[Reject/Rectify]

This ensures clarity in order and compliance with IS 7316 standards.

IS 7316: Method of Test for Edge Straightness and Squareness (Annex A)

A-1 Edge Straightness Test Procedure

• Use a straight edge at least the full length of the plywood.
• For convex edges, position the plywood so gaps at both ends are approximately equal.
• Measure the largest gap (in mm) between the plywood edge and the straight edge.
• Record the measurement to the nearest millimeter.

A-2 Squareness Test Procedure

• Use a 1200 mm x 1200 mm square.
• Place one arm of the square along the plywood edge.
• Check the gap or deviation at the corner to assess squareness.

Tolerances (Clause 7.3 Table)

Summary:

• Edge straightness tolerance: max 2 mm deviation per 1 m length.
• Squareness: checked with a 1200 mm square; no explicit max gap but should be minimal.
• Use these methods to ensure plywood meets dimensional accuracy per IS 7316.

flowchart LR
    A[Plywood Edge] --> B[Place Straight Edge]
    B --> C[Measure Max Gap (mm)]
    D[Plywood Corner] --> E[Place 1200x1200 mm Square]
    E --> F[Check Squareness Gap]