PVC-asbestos floor tiles

IS 3461: Scope & Sampling for Tile Conformity

Scope (Clause 2.1 & 2.1.1):

• Applies to polymeric tiles compounded with suitable plasticizers and stabilizers.
• Acceptance tests include dimensions, tolerances, dimensional stability, and indentation (Clause 6.2.2).

Sampling & Criterion for Conformity (Appendix A)

Conformity Testing Procedure (Clause A-3.1):

1. Test first sample.
2. If defective tiles ≤ acceptance number (a), accept lot.
3. If defective tiles ≥ rejection number (r), reject lot.
4. If defective tiles between a and r, test second sample.
5. Combine samples and apply same acceptance/rejection criteria.

This ensures quality control by statistical sampling, balancing inspection effort and reliability.

IS 3461: Dimensions and Tolerances

Key Tolerances (Clause 3.2)

• For tiles other than those specified, apply a tolerance of ±0.2% on length and width.

Notes:

• These tolerances apply to dimensions specified in Clauses 3.1 and 3.1.1.
• Acceptance and type tests include dimensional checks (Clauses 6.2.1 & 6.2.2).

Summary Table for Quick Reference:

Practical Use:

• Ensure manufacturing processes maintain these tolerances for quality control.
• Use sampling per Appendix A for acceptance testing.

flowchart TD
    A[Start: Tile Manufacturing] --> B[Measure Dimensions]
    B --> C{Dimension within tolerance?}
    C -- Yes --> D[Proceed to next test]
    C -- No --> E[Reject or Reprocess]
    D --> F[Finish & Pack]

This ensures compliance with IS 3461 dimensional standards.

IS 3461: Grades of Tiles – Key Specifications

1. Dimensions & Tolerances (Clause 3.2)

• For other sizes, length & width tolerance = ± 0.2% of dimension.

2. Thickness (Clause 3.1.1)

• Standard thicknesses: 1.5 mm, 2.0 mm, 2.5 mm, 3.0 mm
• Custom sizes allowed if agreed upon.

3. Colour & Finish (Clause 4.1)

• Tiles can be plain (uniform color) or mottled (random color distribution).
• Colour and finish must match agreed samples.
• Batch-to-batch shade variation is normal.

4. Physical Requirements (Clause 5.1)

• Tiles must meet physical test criteria as per Table (not provided here).
• Tests ensure durability and quality.

Summary Table for Tile Grades (Typical)

flowchart LR
    A[Tile Manufacture] --> B[Dimension Control]
    B --> C{Check Tolerances}
    C -->|Within Limits| D[Colour & Finish]
    C -->|Outside Limits| E[Reject or Rework]
    D --> F[Physical Testing]
    F --> G{Pass?}
    G -->|Yes| H[Grade Assignment]
    G -->|No| E

This structure ensures tiles meet IS 3461 quality and dimensional standards.

IS 3461: Colour and Finish - Key Points

• Clause 4.1: Tiles can be plain or mottled.
  • Plain tiles: Uniform colour throughout.
  • Mottled tiles: Random colour distribution through thickness.
• Colour and finish must match an agreed sample between purchaser and supplier.
• Colour variation between batches is normal; mottling variation is characteristic.

Testing (Clause 6.2)

• Type Tests include colour and finish, dimensional stability, colour fastness, indentation, etc.
• Routine Tests: Colour and finish test on every tile.

Tolerances on Dimensions (Clause 3.2)

Note: For other tiles, length and width tolerance = ± 0.2%.

flowchart TD
    A[Tile Manufacture] --> B{Tile Type}
    B -->|Plain| C[Uniform Colour]
    B -->|Mottled| D[Random Colour Distribution]
    C & D --> E[Colour & Finish Test]
    E --> F{Match Sample?}
    F -->|Yes| G[Accept Tile]
    F -->|No| H[Reject or Reprocess]

Summary: IS 3461 mandates colour uniformity or mottling per sample, with strict routine and type testing to ensure consistency in finish and colour.

IS 3461: Physical Requirements for PVC Asbestos Floor Tiles

Key Specifications & Limits

Indentation Limits at 27 ± 2℃ (Table 2)

IS 3461 - Testing Categories Overview

1. Categories of Tests (Clause 6.1 & 6.2)

• Type Tests (6.2.1): Conducted once to establish product characteristics.

  • Colour and finish
  • Dimensions and tolerances
  • Dimensional stability
  • Colour fastness to daylight
  • Volatile matter
  • Indentation & Residual indentation
  • Resistance to various substances

• Acceptance Tests (6.2.2): Performed on samples from each lot (sampling per Appendix A).

  • Dimensions and tolerances
  • Dimensional stability
  • Indentation

2. Sampling Procedure

• Refer to Appendix A for detailed sampling methodology ensuring statistical validity.

Summary Table of Tests:

This classification ensures quality control at both product development and production stages.

IS 3461: Packing and Marking Key Points

Packing (Clause 7.1)

• Tiles must be packed in cardboard or corrugated boxes.
• Each box shall be clearly marked with:
  • Manufacturer's name or trade-mark
  • Size and thickness of tiles
  • Manufacturer's batch number
  • Quantity in square meters (m²)

Marking (Clause 8.1.1)

• Boxes may carry the ISI Certification Mark.
• ISI Mark indicates compliance with the standard under strict inspection and quality control.
• Use of ISI Mark is regulated by the Indian Standards Institution (Certification Marks) Act.

Sampling and Conformity (Appendix A & Clause 6.2.2)

• Samples are selected per sampling procedure in Appendix A.
• Acceptance tests include:
  • Dimensions and tolerances
  • Dimensional stability
  • Indentation resistance

Summary Table for Marking on Boxes

flowchart TD
    A[Tile Production] --> B[Packing in Boxes]
    B --> C[Marking on Boxes]
    C --> D[Manufacturer Name, Size, Thickness]
    C --> E[Batch Number, Quantity]
    C --> F[Optional ISI Mark]
    F --> G[Quality Assurance & Inspection]

This ensures traceability, quality assurance, and compliance with IS 3461.

IS 3461: Sampling and Criterion for Conformity

Sampling Procedure (Table A-2 & A-3)

Criterion for Conformity (Clause A-3.1)

1. First sample:

   • If defective tiles ≤ acceptance number (a), accept the lot.
   • If defective tiles ≥ rejection number (r), reject the lot.
   • If defective tiles between a and r, proceed to second sample.

2. Second sample:

   • Combine defects from both samples.
   • If combined defective tiles ≤ acceptance number, accept the lot.
   • If combined defective tiles ≥ rejection number, reject the lot.

Acceptance Tests (Clause 6.2.2)

• Dimensions and tolerances
• Dimensional stability
• Indentation

Summary Flowchart

flowchart TD
    A[Select first sample] --> B{Defective tiles ≤ a?}
    B -- Yes --> C[Accept Lot]
    B --

IS 3461: Acceptance and Routine Tests Summary

1. Acceptance Tests (Clause 6.2.2 & 6.1.2)

Performed on samples from each lot per Appendix A sampling:

• Dimensions and tolerances
• Dimensional stability
• Indentation

These tests confirm the lot's conformity before acceptance.

2. Sampling Procedure (Table 3, Clause 2.1)

• Second sample is taken if the first sample fails, with increased sample size and adjusted acceptance/rejection criteria.

3. Key Specifications

• Dimensional tolerances: As per Clause 6.2.2(a)
• Dimensional stability: Ensure minimal change under conditions (Clause 6.2.2(c))
• Indentation: Resistance to indentation under specified load (Clause 6.2.2(f))

Visual: Sampling and Acceptance Flow

flowchart TD
    A[Start: Lot Received] --> B[Select Sample per Table 3]
    B --> C{Acceptance Tests}
    C -->|Pass| D[Accept Lot]
    C -->|Fail| E[Take Second Sample]
    E --> F{Acceptance Tests on Second Sample}
    F -->|Pass| D
    F -->|Fail| G[Reject Lot]

This procedure ensures quality control through statistically valid sampling and defined acceptance criteria.

IS 3461 Sampling Procedure for Tiles: Key Points

1. Sample Size & Acceptance Criteria (Table 3)

2. Sampling Method (Clause 2.2)

• Select tiles randomly using random number tables.
• If unavailable, use systematic sampling:
  • Count tiles 1, 2, 3, ..., N.
  • Select every rth tile, where
    [ r = \text{Integral part of } \frac{N}{n} ]
    (N) = total tiles in lot, (n) = sample size.

3. Acceptance Tests (Clause 6.2.2)

• Dimensions & tolerances
• Dimensional stability
• Indentation

Summary Diagram: Sampling Flow

flowchart TD
    A[Start: Identify Lot Size N] --> B{Determine Sample Size n}
    B --> C[Use Table 3 for n]
    C --> D{Random Number Table Available?}
    D -- Yes --> E[Select n tiles randomly]
    D -- No --> F[Select every rth tile, r = floor(N/n)]
    E --> G[Perform Acceptance Tests]
    F --> G