Veneered Decorative Plywood -Specification

IS 1328 - Scope & Key Specifications Summary

IS 1328 covers Veneered Decorative Plywood with emphasis on dimensions, quality, and manufacturing tolerances.

Scope Highlights:

• Applies to veneered decorative plywood used for furniture and interior decoration.
• Dimensions and other specifications are standardized but custom dimensions may be agreed between manufacturer and purchaser (Clause 8.1 Note).
• Definitions supplement those in IS 707:1976 (Clause 3.1).

Key Specifications:

• Squareness Check (Clause 2.1):
  Use a 1200 mm x 1200 mm square.
  Measure the maximum gap between plywood edge and square arm to ensure squareness.

• General Requirements (Clause 13.1):
  Covers surface finish, veneer quality, and bonding requirements.

Important Notes:

• Amendments renumber annexes (Annex C renamed Annex D).
• Foreword and clauses updated for clarity on dimensional tolerances.

Typical Dimensional Tolerance Table (Example):

flowchart LR
    A[Manufacturer & Purchaser] --> B[Agree on Dimensions]
    B --> C[Standard Dimensions per IS 1328]
    B --> D[Custom Dimensions]
    C --> E[Manufacture Plywood]
    D --> E
    E --> F[Check Squareness with 1200x1200 mm Square]
    F --> G[Measure Gap ≤ 3 mm]

For detailed tables and bonding specifications, refer to full IS 1328 document.

IS 1328: Key References and Specifications

• Reference Standard: IS 1328:1996 (Reaffirmed 2007) relates to Steel Tubes for Structural Purposes.
• Related Standard: IS 707:1976 provides additional definitions used in IS 1328.
• Clause 8.1 Note:
  • "Any other dimension as agreed between manufacturer and purchaser may be used."
  • This allows flexibility beyond standard dimensions, ensuring customization.

Important Specifications (General)

*Exact dimension tables are detailed in IS 1328 for various tube sizes.

Summary

• IS 1328 standardizes steel tube dimensions for structural use.
• Definitions from IS 707 supplement IS 1328.
• Manufacturer and purchaser may agree on non-standard dimensions.
• Refer to IS 1328 tables for detailed sizes and tolerances.

flowchart LR
    A[IS 1328: Steel Tubes] --> B[Dimensions & Tolerances]
    A --> C[Material Grades]
    A --> D[Definitions from IS 707]
    B --> E[Standard Sizes]
    B --> F[Custom Dimensions (Clause 8.1)]

IS 1328: Definitions & Key Specifications

• Reference Base: Definitions primarily refer to IS 707:1976 for plywood terminology.
• Clause 3.1: Additional definitions specific to IS 1328 supplement IS 707.
• Dimensions (Clause 8.1): Standard plywood dimensions apply, but any other dimension agreed between manufacturer and purchaser is permissible.
• Decorative Veneers (Clause 7.2.3):
  • Selected by figure, texture, color, and grain.
  • Must be free from defects except those allowed in clauses 7.2.1 and 7.2.2.
  • Veneers can be matched or mismatched for decorative effects.

Common Dimension Designations (IS 1328 / IS 707):

Summary:

• Always cross-check with IS 707 for basic definitions.
• Dimensions are flexible with purchaser agreement.
• Veneer quality and appearance are strictly controlled for decorative plywood.

flowchart LR
    A[IS 707:1976 Definitions] --> B[IS 1328 Additional Definitions]
    B --> C[Dimension Designations]
    C --> D{Dimension Agreement?}
    D -- Yes --> E[Use Agreed Dimensions]
    D -- No --> F[Use Standard Dimensions]
    B --> G[Decorative Veneer Quality]

For detailed tables and tolerances, refer to Clause 8 of IS 1328.

IS 1328: Grades and Types of Veneered Decorative Plywood

Grades (Clause 4.1)

• BWR (Boiling Water Resistant): Suitable for exterior use, resistant to boiling water exposure.
• MR (Moisture Resistant): Suitable for interior use, resistant to moisture but not boiling water.

Types (Clause 4.2)

• Type 1: Higher quality decorative plywood meeting stricter requirements (see Clause 7).
• Type 2: Standard quality decorative plywood conforming to basic requirements.

Testing (Clause 11.1.2.2)

• Boiling Water Test:
  • Prepare 3 specimens (250 mm × 100 mm) from each board.
  • Boil in water for 8 hours.
  • Dry at 65 ± 2°C for 16 hours.
  • Repeat soaking and drying for two more cycles.

Summary Table

flowchart TD
    A[Plywood Grades] --> B(BWR)
    A --> C(MR)
    D[Plywood Types] --> E(Type 1)
    D --> F(Type 2)
    B --> G{Boiling Water Resistant}
    C --> H{Moisture Resistant}
    E --> I{High Quality}
    F --> J{Standard Quality}

This classification helps select plywood based on environmental exposure and quality requirements per IS 1328.

IS 1328: Key Specifications & Notes on Materials for Veneered Decorative Plywood

1. Material Types & Durability

• Plywood types: Moisture Resistant (MR) only.
• Timber species: Any species may be used for cores and backs.
• Veneers: Ornamental veneers on one or both faces for decorative use.

2. Dimensions & Tolerances

• Refer to IS 12049:1987 for plywood thickness and dimension tolerances.
• Custom dimensions allowed if agreed between manufacturer and purchaser.

3. Moisture Conditioning Cycles (Clause 11.1.2.1)

• Drying/soaking cycles can be split into shorter periods.
• Between drying cycles: Keep specimens in air at 27 ± 2°C.
• Between soaking cycles: Keep specimens submerged in water at 27 ± 2°C.

4. Quality & Testing

• Final test values should be rounded per IS 2:1960 rules.
• ECO Mark plywood must meet MR type requirements as per IS 303:1989.

Summary Table: Moisture Conditioning Temperatures

This ensures plywood durability and quality for decorative and structural applications.

IS 1328: Construction Requirements – Key Points

1. General Requirements (Clause 13.1)

• Plywood must meet quality, workmanship, and durability standards.
• Surfaces should be free from defects except those allowed in specific clauses.
• Veneers must be selected for figure, texture, colour, and grain (Clause 7.2.3).
• Veneers can be matched or mismatched for decorative effects.

2. ECO Mark Compliance (Clause 5.3)

• For ECO Mark certification, plywood shall conform to MR type requirements of IS 303:1989.
• MR type plywood is Moisture Resistant and suitable for ECO Mark.

3. Definitions (Clause 3.1)

• Additional definitions supplement IS 707:1976 for plywood terms and classifications.

4. Dimensions & Tolerances (Clause 8)

• Specifies standard thicknesses, lengths, widths, and permissible tolerances.
• Typical plywood thickness tolerance: ±0.2 mm.
• Length and width tolerance: ±2 mm.

Summary Table: Typical Plywood Dimensions & Tolerances

Quick Formula for Veneer Matching

• Veneer matching depends on grain orientation and colour tone to achieve desired aesthetics.

flowchart LR
    A[Veneer Selection] --> B{Match Type}
    B --> C[Matched Grain]
    B --> D[Mis-matched Grain]
    C --> E[Uniform Colour & Texture]
    D --> F[Decorative Contrast]

For detailed manufacturing and testing procedures, refer directly to IS 1328 clauses and IS 303 for ECO Mark specifics.

IS 1328: Surface Quality and Veneer Characteristics

Key Specifications (Clauses 6.1, 7.1.2, 7.1.3, 7.2.3)

• Surface Quality:

  • Veneers must be free from defects such as torn grain, dead knots, discoloration, sapwood, and manufacturing defects (7.1.2, 7.2.3).
  • Minor defects allowed only as per clauses 7.1.1, 7.2.1, and 7.2.2.

• Veneer Characteristics:

  • Selection based on figure, texture, colour, and grain.
  • Veneers should be matched or mis-matched intentionally for decorative effect (7.1.3, 7.2.3).

Tolerances and Dimensions

• Veneers must conform to dimensional tolerances as per Clause 8 (designation of dimensions and tolerances), ensuring uniform thickness and size for proper application.

Summary Table for Veneer Quality

Visual Concept: Veneer Matching

flowchart LR
    A[Select Veneers] --> B{Match Type}
    B -->|Matched| C[Uniform colour & grain]
    B -->|Mis-matched| D[Contrasting figure & texture]
    C & D --> E[Decorative Veneered Surface]

For detailed dimensional tolerances and veneer thickness, refer to Clause 8 of IS 1328.

IS 1328: Dimensions and Tolerances for Plywood (Clause 8.3)

• Edge straightness and squareness tests are detailed in Annex C of IS 1328.
• Dimensions and tolerances (including thickness) also refer to IS 12049:1987.
• Custom dimensions may be agreed upon between manufacturer and purchaser.

Key Notes:

• Thickness tolerance varies with thickness size.
• Length and width tolerances allow only positive deviations.
• Straightness and squareness ensure board quality for fitting and assembly.

flowchart TD
    A[Nominal Dimension] --> B{Tolerance Type}
    B --> C[Length: +6 mm / -0]
    B --> D[Width: +3 mm / -0]
    B --> E[Thickness < 6 mm: ±10%]
    B --> F[Thickness ≥ 6 mm: ±5%]
    B --> G[Edge Straightness: 2 mm/1000 mm]
    B --> H[Squareness: 2 mm/1000 mm]

This summary ensures compliance with IS 1328 for plywood dimensional quality control.

IS 1328: Edge Finishing and Squareness Key Points

Edge Straightness

• Test method: Use a straight edge equal to the full length of plywood.
• If edge is convex, hold straight edge to create equal gaps at ends.
• Measure largest gap to nearest mm.
• Tolerance:
  • 2 mm per 1000 mm length (0.2%).

Squareness

• Edges must be sanded smooth, trimmed straight and square.
• Tested as per Annex C.
• Tolerance:
  • 2 mm per 1000 mm length (0.2%).

Dimensional Tolerances (Clause 8.3)

Summary Diagram: Edge Testing Procedure

flowchart TD
    A[Place plywood on flat surface] --> B[Hold straight edge along edge]
    B --> C{Is edge convex?}
    C -- Yes --> D[Hold straight edge to create equal gaps at ends]
    C -- No --> E[Hold straight edge flush]
    D --> F[Measure largest gap (mm)]
    E --> F
    F --> G[Check if gap ≤ 2 mm per 1000 mm]
    G -- Yes --> H[Edge straightness acceptable]
    G -- No --> I[Edge straightness not acceptable]

Note: Always refer to Annex C for detailed test procedures.

IS 1328: Sampling and Criteria for Conformity

• Sampling Method: As per IS 7638:1986, representative samples must be drawn for testing decorative plywood. This ensures uniform quality assessment.

• Edge Trimming & Squareness (Clause 9.2):

  • Edges trimmed square within ±3 mm tolerance.
  • Edges sanded to smooth finish.
  • Squareness checked using a 1200 mm x 1200 mm square (Clause 2.1).
  • Maximum gap between plywood edge and square arm recorded.

• Edge Straightness and Squareness Test (Annex C):

  • Edge straightness and squareness tolerances per Clause 8.3.
  • Method involves placing square on plywood edge and measuring deviations.

Summary Table for Edge Squareness

flowchart LR
    A[Sample Plywood] --> B[Draw Representative Samples (IS 7638)]
    B --> C[Edge Trimming ±3 mm]
    C --> D[Sand Edges Smooth]
    D --> E[Check Squareness with 1200x1200 mm Square]
    E --> F[Measure Maximum Gap]
    F --> G[Compare with Tolerance (Clause 8.3)]
    G --> H{Conforms?}
    H -->|Yes| I[Accept Batch]
    H -->|No| J[Reject Batch]

This ensures plywood meets quality and dimensional standards before acceptance.

IS 1328 Testing Procedures - Key Points

1. Water Resistance Test (Clause 11.1.2.1)

• Specimens: 3 specimens per board, size 250 mm x 100 mm
• Cycle:
  • Soak in water at 60 ± 2°C for 3 hours
  • Dry at 65 ± 2°C for 8 hours
  • Repeat soaking and drying for 2 more cycles (total 3 cycles)

2. Boiling Water Resistance Test (Clause 11.1.2.2)

• Specimens: 3 specimens per board, size 250 mm x 100 mm
• Cycle:
  • Boil in water for 8 hours
  • Dry at 65 ± 2°C for 16 hours
  • Repeat boiling and drying for 2 more cycles (total 3 cycles)

3. Edge Straightness and Squareness (Annex C, Clause 9.2)

• Edges must be sanded smooth, trimmed straight and square
• Tested as per Annex C with tolerances specified in Clause 8.3

Summary Table:

This ensures the plywood's durability under moisture conditions, critical for decorative plywood applications.

IS 1328: Inspection and Delivery Key Points

Inspection (Clause 12.1)

• Visual inspection of all boards for:
  • Conformance of decorative veneered sides (per Clause 7)
  • Absence of delamination, blisters, and surface defects

Test Specimens (Clause 11.1.2.1)

• Prepare 3 specimens (250 mm × 100 mm) from each board.
• Subject to 3 cycles of:
  • Soaking in water at 60 ± 2°C for 3 hours
  • Drying at 65 ± 2°C for 8 hours
• Between shorter soaking/drying periods, keep specimens at 27 ± 2°C in air or water accordingly.

Notes on Dimensions (Clause 8.1)

• Dimensions can be varied if mutually agreed between manufacturer and purchaser.

Summary Table: Soaking-Drying Cycle for Test Specimens

This procedure ensures durability and resistance to moisture, critical for decorative plywood used in interiors and transport vehicles.

IS 1328 - Additional Requirements for ECO Mark (Plywood)

Key Specifications:

• Packaging: Must be recyclable, reusable, or biodegradable (Clause 12.2).
• Material Quality: Plywood must meet MR type requirements as per IS 303:1989 (Clause 5.3).
• Veneered Decorative Plywood: Must conform to ECO Mark-specific clauses in the standard (Clause 13.2).
• Documentation: Manufacturer must provide certificate/declaration to BIS for ECO Mark application.

ECO Mark Overview:

• Administered by BIS under BIS Act, 1986.
• Combines ISI Mark + Eco logo.
• Optional scheme; manufacturers can opt for ISI Mark alone.
• Focuses on environment-friendly production and packaging.

Summary Table:

flowchart LR
    A[Manufacture Plywood] --> B{Packaging Material}
    B -->|Eco-friendly| C[Eligible for ECO Mark]
    B -->|Non Eco-friendly| D[Not Eligible]
    C --> E{Plywood Quality}
    E -->|Meets MR Type IS 303:1989| F[Conforms to ECO Mark]
    E -->|Does Not Meet| D
    F --> G[Submit Certificate to BIS]
    G --> H[Receive ECO Mark Label]

This ensures plywood is both environmentally responsible and meets BIS quality standards.

IS 1328: Marking and Labeling Key Points

Clause 13.1: Mandatory Marking on Each Plywood Board

• Mark near one corner on the face of the board, legibly and indelibly:
  • Source of manufacture
  • Year of manufacture
  • Batch number
  • Type of plywood (refer Clause 7 for types)

Clause 13.2: BIS Certification Marking

• Decorative veneered plywood may carry the BIS Standard Mark.

Clause 5.3: ECO Mark Requirements

• For ECO Mark certification, plywood must meet MR type requirements as per IS 303:1989.

Clause 14.1 (Amendment)

• Label must specify the criteria for ECO Mark certification.

Summary Table for Marking Requirements

This ensures traceability, quality assurance, and compliance with eco-friendly standards.

IS 1328: Veneered Decorative Plywood - Specification (Third Revision)

Key Points on Referenced Indian Standards (Annex A)

• IS 1328 references several Indian Standards essential for plywood specification, testing, and quality control.
• These include standards on timber species, veneer preparation, adhesives, and testing methods.
• The referenced IS standards ensure uniformity and quality in decorative plywood production.

Important Specifications from IS 1328:

• Types of plywood: Moisture Resistant (MR) only.
• Thickness: Definite recommended thicknesses specified.
• Timber species: Any species allowed for core and back veneers.
• Drying/Soaking cycles: Specimens kept at 27 ± 2°C during intermediate periods between drying and soaking cycles (Clause 11.1.2.1).

Commonly Referenced IS Codes (examples):

Rounding off values:

• Follow IS 2:1960 for numerical rounding rules.

flowchart LR
    A[IS 1328 Standard] --> B[Timber Species]
    A --> C[Plywood Types (MR)]
    A --> D[Thickness Specifications]
    A --> E[Drying/Soaking Cycles]
    A --> F[Referenced IS Codes]
    F --> G[IS 1734 - Testing]
    F --> H[IS 303 - Timber Classification]
    F --> I[IS 848 - Adhesives]
    F --> J[IS 1121 - Veneers]

For detailed tables and formulas, consult the Annex A of IS 1328 and the respective referenced IS standards.