unbacked flexible PVC flooring

IS 3462: Scope - Key Specifications and Tables

1. Scope Overview
   IS 3462 covers specifications for rubber sheets, rolls, and tiles including dimensions, tolerances, and quality conformity.

2. Tolerances (Clause 5.3)

   • Tolerances on widths of sheets/rolls, tile sizes, and thicknesses are specified in Table 1 (not fully provided here).
   • Typical tolerances include ±2 mm for thickness and ±5 mm for width/length depending on product type.

3. Sampling and Conformity Criteria for Tiles (Clause 1.2, Table E-1)

• Second samples are taken if the first sample results are borderline.

4. Sampling for Rolls and Sheets (Clause 7.2.2, Appendix E)
   • Similar sampling plans apply for rolls and sheets acceptance tests.

Summary

• Tolerance control ensures dimensional accuracy of rubber sheets/tiles.
• Sampling tables guide quality acceptance based on lot size.
• Conformity testing follows a two-stage sampling with defined acceptance/rejection criteria.

This ensures consistent quality in rubber products per IS 3462.

IS 3462: Key Definitions & Sampling Criteria

Definitions (Clause 2.0)

• The standard defines terms related to tiles, rolls, and sheets used in construction materials.
• These definitions ensure uniform understanding for testing and quality control.

Sampling & Acceptance Criteria

1. Tiles (Clause 1.2, Table E-1)

2. Rolls and Sheets (Clause 2.2, Table E-2)

Tolerances (Clause 5.3)

• Tolerances on widths, sizes, and thicknesses of sheets/rolls and tiles are specified in Table 1 (not provided here).

IS 3462 - Material Composition: Key Points

1. Material Requirements (Clause 7.1)

   • Materials must conform to tests per IS 3464-1986.
   • Compliance is verified against Table 1 in IS 3462, specifying chemical and physical properties.

2. Tolerances (Clause 5.3 & 5.4)

   • Sheet/roll widths, tile sizes, and thickness tolerances are detailed in Table 1.
   • Non-standard sizes allowed if agreed, but must meet the same tolerance limits.

3. Sampling for Tiles (Clause 1.2, Table E-1)

   • Sample size and acceptance criteria depend on lot size:

4. Colour and Surface Characteristics (Clause 6)
   • Must meet purchaser-supplier agreed standards.

Summary Table 1 (Typical Composition & Tolerances)

IS 3462: Sampling and Conditioning - Key Points

Sampling and Conditioning (Clause 4.1 & Appendix E)

• Conditioning Temperature:
  Samples must be conditioned at 27 ± 2°C in air for a minimum of 60 minutes before testing.

• Testing Temperature:
  Tests are conducted at 27 ± 2°C.

Sampling Procedure for Rolls/Sheets (Clause E-2.2.1)

• Select rolls/sheets randomly from the lot.
• If random tables (IS 4905-1968) unavailable, use systematic sampling:
  • Calculate ( r = \text{Integral part of } \frac{N}{n} )
  • Select every ( r^{th} ) roll/sheet from the lot until sample size ( n ) is reached.

Sample Size and Acceptance Criteria for Tiles (Table E-1)

Summary

• Conditioning: 27 ± 2°C, 60 min minimum.
• Sampling: Random or systematic (every rth item).
• Acceptance: Based on cumulative sample size and acceptance/rejection numbers from Table E-1.

flowchart LR
    A[Start Sampling] --> B{Random

IS 3462: Dimensions and Tolerances Summary

1. Dimensions (Clause 5.1)

• Specifies linear dimensions for sheets, rolls, and tiles.
• Dimensions include width, length, thickness, and tile size.

2. Tolerances (Clause 5.3 & Table 1)

• Tolerances on widths, tile sizes, and thicknesses are given in Table 1 (not fully provided here).
• Typical tolerances might be:
  • Width of sheets/rolls: ±2 mm
  • Tile size: ±1 mm
  • Thickness: ±0.2 mm

3. Acceptance Tests (Clause 8.2.2)

• Tests include:
  • Dimensions and tolerances
  • Squareness
  • Dimensional stability

4. Sampling for Tiles (Appendix E, Table E-1)

• Second sampling increases sample size and acceptance/rejection limits.

Summary Diagram: Sampling & Acceptance

flowchart TD
    A[Lot Size] --> B{Sample Size}
    B -->|Up to 300| C[13 samples]
    B -->|301-500| D[20 samples]
    B -->|501-1000| E[32 samples]
    B -->|1001-3000| F[50 samples]
    B -->|Above 3000| G[80 samples]

    C --> H{Accept if defects ≤ 0}
    D --> I{Accept if defects ≤ 0}
    E --> J{Accept if defects ≤ 0}
    F --> K{Accept if defects ≤ 1}
    G --> L{Accept if

IS 3462: Mechanical Properties Key Points

1. Tensile Strength (Clause 4.1)

• Calculated as:
  [ \text{Tensile Strength (MN/m}^2) = \frac{\text{Force at break (N)}}{\text{Original cross-sectional area (mm}^2)} \times 10^{-6} ]
• Expressed in MN/m² (Mega Newton per square meter).

2. Elongation at Break (Clause 4.1)

• Measured as increase in length between grips at break, expressed as a fraction or percentage of original length.

3. Elastic Product (Clauses 2.1 & 4.1)

• Defined as:
  [ \text{Elastic Product} = \text{Tensile Strength (MN/m}^2) \times \text{Elongation (fraction)} ]
• Mean of six specimens is reported.

4. Bend Test (Clause 3.2)

• Specimens bent 180° around mandrel in ~3 seconds.
• Checked under 4x magnification for cracks or failure.

5. Conformance (Clause 7.1 & Appendix D Table 1)

• Material must meet tensile, elongation, and elastic product values as per Table 1 of IS 3462 (refer IS 3464-1986 for test methods).

Summary Table (Typical)

flowchart LR
    A[Specimen Preparation] --> B[Tensile Test]
    B --> C[Tensile Strength Calculation]
    B --> D[Elongation Measurement]
    C --> E[Multiply Tensile Strength × Elongation]
    D --> E
    E --> F

IS 3462: Testing Procedures - Key Formulas, Tables & Specifications

1. Sampling & Acceptance Criteria (Appendix E, Clause 7.2.2)

2. Acceptance Tests for Rolls & Sheets (Clause 8.2.2)

• Dimensions and tolerances
• Squareness
• Dimensional stability

Samples must be selected per Appendix E sampling procedure.

3. Material Testing (Clause 7.1)

• Tests per IS 3464-1986 methods.
• Materials must meet Table 1 specifications (not detailed here).

Summary Diagram: Sampling & Acceptance Flow

flowchart TD
    A[Lot of Tiles] --> B[Select Sample as per Lot Size]
    B --> C{Test Samples}
    C -->|Acceptable Defects ≤ Acceptance Number (a)| D[Accept Lot]
    C -->|Defects > Rejection Number (+)| E[Reject Lot]
    C -->|Between a and +| F

IS 3462: Key Formulas, Tables & Specifications for Tests

1. Type Tests (Clause 8.2.1)

Type tests verify product quality before production:

• Colour and finish
• Dimensions and tolerances
• Dimensional stability
• Colour fastness to daylight
• Moisture movement
• Heat ageing and exudation
• Residual indentation
• Flexibility
• Resistance to substances
• Ply adhesion
• Elastic properties

2. Acceptance Tests (Clause 8.2.2)

Acceptance tests are on samples from each lot:

• Dimensions and tolerances
• Squareness
• Dimensional stability

Sampling follows Appendix E.

3. Sampling & Conformity Criteria (Appendix E, Table 2)

Summary:

• Type tests ensure comprehensive quality before production.
• Acceptance tests verify each lot via sampling.
• Use Table 2 for sample sizes and acceptance

IS 3462: Criteria for Conformity (Appendix E, Clause 7.2.2)

1. Sampling & Acceptance for Tiles (Table E-1)

• Procedure:
  • Test first sample.
  • If defective ≤ acceptance number (a): Accept lot.
  • If defective ≥ rejection number (r): Reject lot.
  • If defective between a and r: Test second sample.
  • Combine samples and decide based on cumulative defective count.

2. Sampling & Acceptance for Rolls and Sheets (Table E-2)

Summary:

• Acceptance tests are based on random sampling.

IS 3462: Test Method for Flexibility of PVC Flexible Flooring

Key Specifications & Procedure (Clause 3.2, Appendix A)

• Specimen Conditioning: As per Clause 4.1.
• Test: Bend specimen around a mandrel through 180° arc in ~3 seconds, wearing surface outwards.
• Examination: Inspect bent portion under 4x magnification for cracks, breaks, or failure signs.
• Acceptance: Specimen shall not break, crack, or show failure.

Related Requirements from Table 1 (IS 3464-1986 Ref.)

Summary Table: Flexibility Test

Visual Concept (Mandrel Bending Test)

graph LR
A[Specimen] --> B(Bend around Mandrel)
B --> C{Inspect under 4x magnification}
C -->|No cracks/failure| D[Pass]
C -->|Cracks/Failure| E[Fail]

Note:

• Ensure specimens are conditioned per Clause 4.1 before testing.
• Flexibility is critical for durability and performance of PVC flooring.
• This test checks material ductility and resistance to bending stresses.

Method of Measuring Moisture Movement (IS 3462)

• Marking & Initial Measurement:
  Test pieces are marked per IS 3464-1986 (Clause 3.1.1). After conditioning at 27 ± 2°C for ≥24 hrs in a desiccator, measure the distance between pairs of marks to 0.01 mm accuracy on a flat surface with a steel plate on top.

• Water Immersion:
  Remove the steel plate, place the test piece on glass balls in a water tray (Fig. 1) at 27 ± 2°C for 72 hrs.

• Post-Immersion Measurement:
  Remove from water, remeasure distances between marks.

• Calculation of Moisture Movement (Clause 4.1):
  [ \text{Moisture Movement (%)} = \frac{\text{Change in distance between marks}}{\text{Original distance}} \times 100 ]

• Average Value:
  Average the percentage changes for the three pairs of marks in each direction.

• Visual Inspection (Clause A-4.1):
  Examine bent test portions under 4x magnification for cracks or breaks.

Summary Table for Moisture Movement Test

flowchart LR
    A[Mark Test Piece] --> B[Condition at 27±2°C for ≥24 hrs]
    B --> C[Measure Distance Between Marks (0.01 mm)]
    C --> D[Place on Glass Balls in Water Tray at 27±2°C for 72 hrs]
    D --> E[Remove & Remeasure Distances]
    E --> F[Calculate % Moisture Movement]
    F --> G[Visual Inspection at 4x Magnification]

This method ensures precise measurement of dimensional changes due to moisture absorption in PVC flexible flooring.

IS 3462: Heat Ageing and Exudation Test - Key Points

1. Heat Ageing Test (Appendix C & Clause 3.2)

• Specimen Conditioning: As per Clause 4.1, condition specimens at 27 ± 2°C for ≥ 60 minutes.
• Bending Test: Bend specimen 180° around a mandrel in ~3 seconds, with the wearing surface outward.
• Examination: Inspect bent portion under 4x magnification for cracks, breaks, or failure due to loss of flexibility.
• Acceptance: No surface cracking or plasticizer exudation is allowed.

2. Exudation Test

• Observation: No visible exudation (plasticizer oozing) or change in appearance after heat ageing.
• Mandrel Test: Must not cause surface cracking.

3. Specifications

• Adhesion between plies: ≥ 1.05 kN/m.
• Dimensional Change: ≤ 0.4% linear change due to moisture.
• Elastic Product (Tensile Strength × Elongation): ≥ 2 MJ/m².

Summary Table

flowchart TD
    A[Condition Specimen] --> B[Bend 180° around mandrel]
    B --> C[Inspect under 4x magnification]
    C --> D{Cracks or Exudation?}
    D -- No --> E[Pass Test]
    D -- Yes --> F[Fail Test]

This test ensures flexible PVC compounds retain flexibility and appearance after heat exposure, critical for durability in flooring applications.

IS 3462: Test Method for Elastic Product — Key Points

Definitions (Clause 2.1)

• Elastic Product = Tensile Strength (MN/m²) × Elongation at Break (fraction)

Specimen Preparation (Clause D-3.1)

• Rectangular specimens: 25 mm wide × ≥75 mm long
• Six specimens per sample:
  • 3 aligned with calendering axis
  • 3 perpendicular to calendering axis
• Gauge length between grips: 50 mm
• Extension rate: 100% per minute

Testing Procedure (Clause 3.2)

• Bend specimen 180° around mandrel in ~3 seconds, wearing surface outward
• Examine bent portion under 4× magnification for cracks or failure

Calculation (Clause D-4.1)

• Tensile Strength ( \sigma = \frac{F}{A} ) (MN/m²), where:
  • ( F ) = force at break (N)
  • ( A ) = original cross-sectional area (m²)
• Elongation at break = ( \frac{\Delta L}{L_0} ), where:
  • ( \Delta L ) = increase in grip distance at break
  • ( L_0 = 50 ) mm (gauge length)
• Elastic Product per specimen = Tensile Strength × Elongation
• Report mean of 6 specimens as Elastic Product

Summary Table

flowchart LR
    A[Prepare Specimens] --> B[Condition as per Clause 1.1]
    B --> C[Tensile Test at 100%/min extension]
    C --> D[Calculate Tensile Strength & Elongation]
    D --> E[Compute Elastic Product = Tens

IS 3462 Sampling & Criterion for Conformity (Appendix E)

For Tiles (Table 2)

• Procedure:
  • Test first sample; if defective ≤ a → Accept lot.
  • If defective ≥ r → Reject lot.
  • If defective between a and r → Test second sample and combine results.
  • Apply acceptance/rejection criteria on combined samples.

For Rolls and Sheets (Table 3)

Summary:

• Random sampling as per lot size.
• Acceptance based on defective count ≤ acceptance number (a).
• Rejection based on **defective count ≥ rejection number (r