wooden folding chairs

IS 6632 - Scope & Key Specifications

• Scope (Clause 3.3 & 2.5):
  The standard requires mutual agreement between manufacturer and purchaser on specific requirements. Purchaser has the option to select parameters suiting their needs.

• Rounding Off (Clause 0.5):
  Test results must be rounded per IS 2-1960 rules, retaining the same significant figures as the specified values.

• General Requirements (Clause 5.1):
  Physical tests, visual examination, and sampling scale are detailed in Appendix A.

• Appendix A - Tests & Sampling:
  Specifies physical tests and sampling procedures to ensure compliance.

Summary Table: Key Clauses

For detailed test methods and sampling scales, refer to Appendix A of IS 6632.

IS 6632 — Key Materials Specifications & Tables

1. Decorative Plastic Laminates (Clause 2.5)

• Must conform to IS: 2046-1969.
• Design & finish as per purchaser's specification.

2. Timber Specifications:

• Classification and zonal distribution of commercial timbers.
• Maximum permissible moisture content varies by timber use & climatic zone.
• Cut sizes and preservation methods per IS codes (revised versions).
• Adhesives:
  • Cold setting casein glue.
  • Polyvinyl acetate dispersion-based adhesives.
• Wood screws per technical supply conditions.
• Plywood for general purposes (second revision).

3. Sampling & Testing (Clause 3.1, Table 1):

4. Testing Methods (Appendix A):

• Resistance to dry heat, wet heat, marking by liquids, and mechanical damage for clear finishes.

Summary:

• Material selection must meet IS standards for timber, adhesives, laminates.
• Sampling size and permissible defects strictly follow Table 1.
• Testing methods ensure durability and finish quality.

flowchart TD
    A[Material Selection] --> B{Timber / Laminates / Adhesives}
    B --> C[Conform to IS Standards]
    C --> D[Sampling & Testing]
    D --> E{Sample Size & Defect Limits}
    E --> F[Lot Size Based Sampling Table]
    D --> G[Physical & Finish Tests]

For detailed IS references, consult IS: 2046, IS: 6632 clauses, and related timber preservation codes.

IS 6632: Dimensions, Tolerances, and Manufacture Key Points

1. Tolerances on Dimensions (Clause 3.2)

2. Material Specifications (Clause 2.5.1)

• Upholstery materials like Rexin, PVC, or other plastic cloth must conform to relevant Indian Standards or be approved by the purchaser.

3. Sampling and Quality Control (Clause 3.1, Table 1)

4. Rounding Off (Clause 3.3)

• Follow IS 2-1960 for rounding numerical values; maintain the same significant figures as specified.

Summary Diagram: Dimension Tolerances & Sampling

flowchart TD
    A[Chair Dimensions] --> B{Tolerance Limits}
    B -->|Length| C[± 3 mm]
    B -->|Height/Width/Depth| D[± 3 mm]
    B -->|Component Section| E[± 1 mm]
    F[Lot Size] --> G[Sample Size]
    G --> H[Permissible Defectives]

This concise summary ensures compliance with IS 6632 for manufacturing and quality control of chairs.

IS 6632 - Finishing: Key Points & Specifications

Finishing Methods (Clause 4.1)

• Surface finishing options: waxing, French polishing, varnishing, painting.
• Application must follow IS: 2338 (Part 1)-1967 (Code of Practice for finishing wood).
• Use of clear lacquer, melamine resin, or polyurethane paints must follow manufacturer's instructions.

Testing Requirements

• Resistance to marking by liquids:

  • Test as per IS: 5807 (Part 4)-1975.
  • Minimum qualifying average rating: 8.

• Resistance to wet heat:

  • Test as per IS: 5807 (Part 2)-1975.
  • Minimum qualifying average rating: 7.

Decorative Laminates (Clause 2.5)

• Must conform to IS: 2046-1969.
• Design and finish as specified by purchaser.

Summary Table of Finish Tests

This ensures durable, quality finishes on timber surfaces per IS 6632 standards.

IS 6632: Tests and Sampling - Key Points

1. Sampling Procedure (Clause 3.1, Table 1)

• Sampling is random from the lot.
• No defectives allowed for smaller lots; limited defectives allowed for larger lots.

2. Physical Tests (Appendix A)

• Visual examination and physical tests as per Appendix A.
• Resistance tests on finishes include:
  • Dry heat resistance (Part 1)
  • Wet heat resistance (Part 2)
  • Resistance to marking by liquids (Part 4)
  • Mechanical damage resistance (Part 6, IS 5807)

3. Mechanical Damage Test (Clause A-2.7)

• Impact, cross-cut, and scrape tests per IS 5807 (Part 6) - 1978.
• Finish rating must conform to clause 5.3 of IS 5807 (Part 6).

flowchart TD
    A[Lot of Chairs] --> B[Random Sampling as per Table 1]
    B --> C{Sample Size}
    C --> D[Physical Tests]
    C --> E[Visual Examination]
    D --> F[Resistance Tests (Heat, Liquids, Mechanical)]
    F --> G[Mechanical Damage Test (IS 5807 Part 6)]

This ensures quality control by limiting defective chairs and verifying finish durability.

IS 6632 - Marking: Key Points & Specifications

• Clause 6.1:
  All wooden folding chairs must be marked with a suitable mark identifying the manufacturer.

• Clause 6.1.1:
  Chairs may also carry the Standard Mark governed by the BIS Act 1986, ensuring:

  • Compliance with IS 6632
  • Quality control and inspection by BIS
  • Continuous conformity checks

• Clause 2.6 (Surface Resistance to Marking):
  Surface finish is tested per IS 5807 (Part 4) - 1975 for resistance to marking by liquids.

  • Minimum qualifying average rating: As per clause 8 of IS 5807 (Part 4)
  • Ensures durability of surface finish against liquid stains

• Rounding Off (Clause 3.3 & 0.5):
  Test results must be rounded off according to IS 2-1960 rules, maintaining the same number of significant digits as specified values.

Summary Table for Marking Requirements

flowchart TD
    A[Wooden Folding Chair] --> B[Manufacturer Mark]
    B --> C{Standard Mark?}
    C -- Yes --> D[BIS Certification & Quality Control]
    C -- No --> E[Manufacturer's Responsibility]
    A --> F[Surface Finish Testing]
    F --> G[IS 5807 (Part 4) - Liquid Marking Resistance]
    G --> H[Minimum Qualifying Rating]

This ensures traceability, quality assurance, and durability of wooden folding chairs as per IS 6632.

IS 6632: Additional Requirements for ECO Mark

Key Specifications for ECO Mark (Clause 5)

• Plywood: Must conform to IS 303:1989 ECO Mark requirements.
• Medium Density Fibreboard (MDF): Must conform to IS 12406:1988 ECO Mark requirements.
• Environmental Clearance: Manufacturer must submit:
  • Environmental consent clearance from State Pollution Control Board (per Water Act 1974 & Air Act 1981)
  • Authorization under Environment (Protection) Act 1986 (if applicable)

Manufacturer's Documentation (Clause 5.2)

• Provide documentary evidence (certificate/declaration) confirming compliance with ECO Mark requirements to BIS.

Summary Table

This ensures product quality and environmental compliance for ECO Mark certification under IS 6632.

IS 6632: Tests and Sampling (Clause 5.1 & Appendix A)

1. Physical Tests (A-1)

• Visual examination and physical tests as per Appendix A.
• Surface resistance tests (impact, cross-cut, scrape) per IS 5807 (Part 6)-1978.
• Ratings conform to Clause 5.3 of IS 5807 (Part 6).

2. Test Sample (A-3, Clause 3.1)

Samples are randomly drawn based on lot size as per Table 1:

3. Additional Test Methods for Clear Finishes:

• Resistance to dry heat (Part 1)
• Resistance to wet heat (Part 2)
• Resistance to marking by liquids (Part 4)
• Resistance to mechanical damage (Part 6)

Summary Diagram: Sampling Process

flowchart TD
    A[Start: Define Lot Size] --> B{Lot Size Range}
    B -->|Up to 50| C[Sample 3 Chairs]
    B -->|51 to 150| D[Sample 5 Chairs]
    B -->|151 to 300| E[Sample 8 Chairs]
    B -->|301 to 500| F[Sample 13 Chairs]
    B -->|501 to 1,000| G[Sample 28 Chairs]
    B -->|1,001 to 3,000| H[Sample 32 Chairs]
    B -->|Above 3,000| I[Sample 50 Chairs]
    C --> J[Check Defectives ≤ 0]
    D --> J
    E --> J