Rubber Flooring Materials For General Purposes

IS 809: Scope & Key Specifications Summary

• Scope (Clause 1.1):
  Covers rubber flooring materials for general purposes like domestic buildings, hospitals, cinemas, ships, and transport vehicles.
  Excludes special flooring for electrical insulation, conductive/anti-static, or chemical/oil resistance.

• Sheet Dimensions (Clause 2.1):

  • Sheet widths up to 2.1 m covered.
  • Includes max hardness limits and permissible tolerances.
  • Abrasion resistance measurement optional (agreement between purchaser & supplier).

• Defect Criteria (Clause 4.1):

  • Lot accepted if defective sheets ≤ permissible number in Table 3 (appearance & dimensions).

• Hardness Tolerances (Clause 6.1.1):

  Nominal Hardness IRHD	Tolerance IRHD
  65 to 76	± 5
  >76 to 86	± 4
  >86 to 96	± 3

• Testing & Rounding (Clause 1.3 & IS 2:1960):

  • Number of tests and conformity criteria specified (G-1.3).
  • Results rounded as per IS 2:1960 rules, maintaining significant figures.

References:

• BS 1711:1975 for international coordination.
• Annex A lists related Indian Standards.

flowchart LR
  A[Rubber Flooring Material] --> B[General Purpose Use]
  B --> C{Sheet Width ≤ 2.1 m?}
  C -->|Yes| D[Check Hardness & Dimensions]
  D --> E{Defects ≤ Permissible?}
  E -->|Yes| F[Lot Accepted]
  E -->|No| G[Lot Rejected]
  D --> H[Hardness Tolerance Table]

This summarizes the scope, dimensions, defect criteria, and hardness tolerances per IS 809 for rubber flooring materials.

Key References and Specifications from IS 809 (Rubber Flooring Materials)

1. Tolerances on Hardness (Clause 6.1.1, Table 1)

• Hardness measured as IRHD (International Rubber Hardness Degree).
• Final hardness values rounded as per IS 2:1960.

2. Sampling and Conformity (Clause 8, Annex G)

• Sampling methods and criteria for acceptance are detailed in Annex G.
• Lot acceptance depends on the permissible number of defective sheets in the sample.

3. Marking (Clause 7.2.1)

• Flooring sheets, rolls, or tiles may bear the Standard Mark.

4. List of Referred Indian Standards

5. Additional Notes

• Sheet widths covered up to 2.1 m.
• Abrasion resistance test is optional, based on purchaser-supplier agreement.
• Standard aligned with BS 1711:1975 for international coordination.

Summary Diagram of Key Clauses

graph TD
  A[IS 809 Rubber Flooring] --> B[Tolerances on Hardness]
  A --> C[Sampling & Conformity]
  A --> D[Marking]
  A --> E[Referenced IS Standards]
  B --> B1[Hardness ±3 to ±5 IRHD]
  C --> C1

IS 809: Definitions & Key Specifications Summary

• Scope: Covers rubber flooring materials for general purposes (domestic, public buildings, transport, etc.), excluding special types like electrical insulating or chemical/oil-resistant flooring.

• Sheet Dimensions:

  • Sheet widths up to 2.1 m are covered (Clause 2.1c).
  • Appearance & dimension conformity is checked by sampling; a lot passes if defective sheets ≤ permissible number (Table 3, Clause 4.1).

• Hardness Tolerances (Clause 6.1.1):
  | Nominal Hardness IRHD | Tolerance IRHD | |----------------------|-----------------| | 65 to 76 | ± 5 | | Over 76 to 86 | ± 4 | | Over 86 to 96 | ± 3 |

• Testing & Rounding:

  • Number of tests and criteria for conformity per Clause 1.3.
  • Results rounded per IS 2:1960 rules, matching significant figures of specified values.

• Additional Notes:

  • Resistance to abrasion test included if agreed.
  • Standard aligned with BS 1711:1975 for international coordination.

flowchart TD
    A[Rubber Flooring Material] --> B[Sheet Dimensions ≤ 2.1 m]
    A --> C[Hardness Nominal IRHD]
    C --> D[65-76 ±5]
    C --> E[76-86 ±4]
    C --> F[86-96 ±3]
    A --> G[Testing & Conformity]
    G --> H[Sample Defect ≤ Permissible → Pass]
    G --> I[Rounding per IS 2:1960]

This concise overview helps ensure compliance with IS 809 definitions and specifications.

IS 809: General Requirements - Key Specifications for Sheets

1. Sampling and Testing (Clause 1.3 & 1.3.2)

• Step 1: Select sheets conforming to appearance and dimensions (Clause 1.3.1).
• Step 2: From these, randomly select sheets as per Column 4, Table 3.
• Step 3: From each sheet, take specimens for:
  • Hardness test
  • Water absorption test
  • Compression set test
• Defect Criteria: A sheet is defective if any specimen fails any test.
• Lot Acceptance: Lot passes if defective sheets ≤ permissible defective number (Column 5, Table 3).

2. Appearance and Dimension Compliance (Clause 4.1)

• Lot is acceptable if defective sheets ≤ permissible defective sheets (Column 3, Table 3).

3. Table 3 Overview (Sampling & Defect Limits)

Note: Refer IS 809 Table 3 for exact sample sizes and defect limits.

flowchart TD
    A[Lot of Sheets] --> B{Appearance & Dimension Test}
    B -- Pass --> C[Select Sheets as per Table 3 col 4]
    C --> D[Conduct Hardness, Water Absorption, Compression Tests]
    D --> E{Defective Sheets ≤ Permissible?}
    E -- Yes --> F[Lot Accepted]
    E -- No --> G[Lot Rejected]
    B -- Fail --> G

Summary:

• Use Table 3 for sample size and defect limits.
• Sheets must pass appearance/dimension first, then physical tests.
• Defective sheets beyond permissible numbers lead to rejection of the lot.

IS 809: Dimensions and Tolerances Key Points

1. Tolerances on Hardness (Clause 6.1.1, Table 1)

2. Sheet Width Tolerance (Clause 5.3.1)

• Width shall not be less than nominal.
• Width can exceed nominal by up to 6 mm.

3. Acceptance Criteria for Defective Sheets (Clause 4.1)

• A lot is acceptable if defective sheets ≤ permissible number in Table 3 (sampling plan).
• Defective if any requirement is not met.

Summary Table for Quick Reference:

flowchart TD
    A[Select Sheets] --> B[Inspect Appearance & Dimensions]
    B --> C{Defective Sheets ≤ Permissible?}
    C -- Yes --> D[Lot Accepted]
    C -- No --> E[Lot Rejected]

This ensures quality control on dimensions and hardness per IS 809.

IS 809: Performance Requirements Summary

1. Appearance & Dimensions (Clause 1.3, 4.1)

• A lot passes if defective sheets ≤ permissible defective sheets (Table 3, Col 3).
• Any sheet defective in any requirement is rejected.

2. Sponge-backed Rubber Flooring (Clause 5.4)

• Wearing surface thickness ≥ 3 mm solid rubber.
• Sponge rubber base thickness ≥ 3 mm.

3. Hardness, Water Absorption & Compression Set Tests (Clause 1.3.2)

• From conforming sheets (appearance & dimensions), select sheets as per Table 3, Col 4.
• Test specimens from these sheets must meet hardness, water absorption, compression set.
• Sheet fails if any test fails.
• Lot passes if defective sheets ≤ permissible defective sheets (Table 3, Col 5).

Table 3 (Summary)

(Refer IS 809 Table 3 for exact numbers based on lot size)

Key Notes:

• Lot acceptance is based on sampling and permissible defects.
• Tests ensure durability and quality of rubber flooring sheets.
• Thickness specs ensure wear resistance and cushioning.

flowchart LR
    A[Lot of Sheets] --> B{Appearance & Dimensions Test}
    B -- Pass --> C{Hardness, Water Absorption, Compression Set Tests}
    B -- Fail --> D[Reject Lot]
    C -- Pass --> E[Accept Lot]
    C -- Fail --> D

For detailed sample sizes and permissible defects, always refer to Table 3 of IS 809.

IS 809: Packing and Marking of Rubber Tiles

Packing (Clause 7.1.2)

• Rubber tiles must be wrapped in hessian cloth and packed in wooden crates.
• Tiles at extreme ends are placed back-to-back to prevent surface damage.
• Wooden box dimensions per tile size (Table 2):

Marking (Clause 7.2)

Each tile/sheet/roll must be indelibly marked with:

• Source of manufacture
• Thickness, width, length (for sheets/rolls) or thickness and size (for tiles)
• Year of manufacture

Optionally, the Standard Mark may be included (Clause 7.2.1).

Abrasion Resistance (Clause 6.4)

• Tested per IS 3400 (Part 3): 1987
• Values as agreed between purchaser and supplier.

Summary Diagram: Packing Process

flowchart TD
    A[Rubber Tiles] --> B[Wrap in Hessian Cloth]
    B --> C[Arrange tiles with ends back-to-back]
    C --> D[Place in Wooden Crates]
    D --> E[Mark with Manufacturer, Size, Year]

References: IS 3400 (Part 3), IS 2818 (Part 2), IS 180, IS 3400 (Parts 2 & 10) for tests and materials.

IS 809: Sampling and Criteria for Conformity of Rubber Flooring Materials

Key Points from Annex G (Clause 8.1):

• Sampling Method: Samples must be randomly selected per IS 4905:1968.
• Sample Size: Number of sheets/tiles for testing is per Tables 3 and 4.
• Defect Criteria:
  • Any sheet defective in one or more parameters is defective.
  • Lot conformity is accepted if defective sheets ≤ permissible defective sheets (Table 3, col 3).

Summary of Sampling Procedure:

(Exact values must be taken from IS 809 Table 3 & 4)

Additional Notes:

• Sampling follows IS 4905:1968 for randomness.
• Tests cover appearance, dimensions, and other properties.
• Lot acceptance depends on defective count within permissible limits.

flowchart TD
    A[Start: Rubber Flooring Lot] --> B[Random Sampling per IS 4905]
    B --> C[Select Sample Size (Table 3 & 4)]
    C --> D[Test Samples for Defects]
    D --> E{Defective Sheets ≤ Permissible?}
    E -->|Yes| F[Lot Accepted]
    E -->|No| G[Lot Rejected]

For exact sample sizes and defect limits, refer to IS 809 Tables 3 & 4.

IS 809: List of Referred Indian Standards

IS 809 references several Indian Standards essential for testing and specification compliance of flooring sheets and tiles. Key referred standards include:

Usage Notes

• These standards cover material specifications, test methods (hardness, abrasion, compression set), and sampling procedures.
• Sampling and conformity criteria for sheets and tiles are detailed in Annex G of IS 809.
• The Standard Mark usage is governed by BIS rules ensuring quality control.

For detailed test procedures, refer to the respective IS documents.

Summary Diagram: Referenced Standards and Their Focus

graph TD
  A[IS 809 Flooring Standard] --> B[IS 180: Cotton Sheetings]
  A --> C[IS 2818: Indian Hessian]
  A --> D[IS 3400 Part 2: Hardness Test]
  A --> E[IS 3400 Part 3: Abrasion Test]
  A --> F[IS 3400 Part 10: Compression Set Test]
  A --> G[IS 4905: Sampling Methods]

This ensures compliance with material and testing requirements for flooring products under IS 809.

IS 809: Measurement of Thickness - Key Points

• Instrument: Use a dial micrometer gauge with:

  • Least count: 0.02 mm
  • Foot pressure on rubber: 0.01 to 0.021 N/mm²

• Measurement Procedure:

  • For sheets (Clause 2.1.1): Measure thickness at 20 scattered points along edges and ends.
  • For tiles (Clause 2.1.2): Take 5 tiles, measure thickness at 4 scattered points each.

• Thickness Range Covered:

  • Rubber flooring thickness from 3 mm to 6 mm.

Summary Table for Thickness Measurement

Notes:

• Ensure uniform pressure to avoid compression errors.
• Measurements should be representative of the entire sample.

flowchart LR
    A[Start] --> B[Select sample (sheet/tile)]
    B --> C{Material Type?}
    C -->|Sheet| D[Measure thickness at 20 points]
    C -->|Tile| E[Measure 4 points on each of 5 tiles]
    D --> F[Use dial micrometer (0.02 mm least count)]
    E --> F
    F --> G[Ensure foot pressure 0.01 to 0.021 N/mm²]
    G --> H[Record thickness values]
    H --> I[Calculate average thickness]
    I --> J[End]

This ensures accurate, standardized thickness measurement per IS 809.

IS 809 - Measurement of Size of Tiles (Clause 5.2.1)

Key Specifications:

• Instrument Accuracy: Use a measuring instrument with accuracy of 0.02 mm.
• Measurement Points: Measure length and width at three quarter points along each dimension (length and width).
• Dimension Calculation: Average the three measurements in each direction to get the tile dimension.

Measurement Procedure:

1. Measure length at 25%, 50%, and 75% points along the tile length.
2. Measure width at 25%, 50%, and 75% points along the tile width.
3. Calculate average length and width from these three measurements.

Summary Table:

Notes:

• This method ensures accurate sizing and helps verify tile squareness.
• Refer to Fig. 1 in IS 809 for visual guidance on measurement points.

flowchart LR
    A[Start] --> B[Measure Length at 25%, 50%, 75%]
    B --> C[Measure Width at 25%, 50%, 75%]
    C --> D[Calculate Average Length]
    C --> E[Calculate Average Width]
    D & E --> F[Determine Tile Size]
    F --> G[Check Squareness]
    G --> H[End]

This method ensures uniformity and quality control of tile dimensions as per IS 809.

IS 809: Measurement of Squareness of Tiles (Clause 5.2.2, Annex D)

Apparatus:

• L-shaped metal jig with two arms longer than tile sides.
• Arms set at a true right angle on a flat metal base plate (Fig. 2).
• Base plate must be perfectly flat and defect-free.

Test Procedure:

• Use 5 tiles for testing.
• Place each tile corner into the jig's right angle.
• Hold one side of the tile lightly against one arm.
• Measure the gap between the other tile side and the second arm using a feeler gauge or microscope.

Acceptance Criteria:

• Maximum allowable gap: 0.15 mm

Measurement of Tile Size (Clause 5.2.1):

• Measure length and width at three quarter points along each side (Fig. 1).
• Use instruments with accuracy of 0.02 mm.
• Average the three measurements for each direction to get tile dimensions.

Summary Table:

flowchart LR
    A[Place tile corner in jig] --> B[Hold one side against jig arm]
    B --> C[Measure gap with feeler gauge]
    C --> D{Gap ≤ 0.15 mm?}
    D -- Yes --> E[Tile passes squareness test]
    D -- No --> F[Tile fails squareness test]

This method ensures tiles are square within tolerance for proper installation and aesthetics.

IS 809: Determination of Water Absorption (Clause 6.2 & Annex E)

Test Procedure (Annex E, Clause 1.1)

• Specimen size: 100 mm × 100 mm with clean cut edges.
• Initial weight: Weigh specimen to nearest mg → P1.
• Immersion: Immerse in distilled water at 27 ± 2°C for 24 hours.
• Post-immersion: Remove, superficially dry with filter paper, weigh immediately → P2.

Water Absorption Formula:

[ \text{Water Absorption (%) } = \frac{(P2 - P1)}{P1} \times 100 ]

Specification (Clause 6.2)

• Maximum water absorption allowed: 0.5% by weight.

Sampling & Acceptance Criteria (Clause 1.3.2)

• Number of sheets and specimens tested as per Table 3 (refer IS 809).
• A sheet is defective if any specimen fails water absorption or other tests.
• Lot acceptance depends on permissible defective sheets (see Table 3).

Summary Table:

flowchart TD
    A[Cut Specimen 100x100 mm] --> B[Weigh (P1)]
    B --> C[Immerse in distilled water at 27±2°C for 24 hrs]
    C --> D[Remove & dry superficially]
    D --> E[Weigh immediately (P2)]
    E --> F[Calculate Water Absorption %]
    F --> G{Absorption ≤ 0.5%?}
    G -->|Yes| H[Specimen Passes]
    G -->|No| I[Specimen Fails]

This ensures rubber sheets/tiles meet durability and quality standards against moisture ingress.

IS 809: Accelerated Ageing Key Points (Annex F, Clause 6.3)

Accelerated Ageing Procedure

• Temperature: 70 ± 1°C in a thermostatically controlled air oven.
• Duration: Continuous 240 hours (10 days).
• Air Circulation: Air changed ~3 times/hour; specimens occupy ≤10% of oven air volume.
• Specimen Condition: Stationary, strain-free, fully exposed to air, protected from light.
• Post-Ageing: Keep specimens for ≥24 hours at 27 ± 2°C in darkness before testing.

Compression Set Test (Clause 6.3)

• Test as per IS 3400 (Part 10):1977.
• Test Conditions: 24 ± 0 hours at 27 ± 1°C.
• Acceptance Criteria: Compression set ≤ 15% for both new and aged specimens.

Summary Table

flowchart LR
    A[Prepare Specimens] --> B[Place in Oven at 70±1°C]
    B --> C[Maintain Air Flow (3 changes/hr)]
    C --> D[Age for 240 hours]
    D --> E[Store in Darkness at 27±2°C for 24 hours]
    E --> F[Perform Compression Set Test (IS 3400 Pt 10)]
    F --> G{Compression Set ≤ 15%?}
    G -- Yes --> H[Specimens Pass]
    G -- No --> I[Specimens Fail]

This ensures reliable accelerated ageing to simulate long-term material behavior per IS 809 standards.

IS 809: Sampling and Criteria for Conformity of Rubber Flooring Materials

Key Points from Annex G (Clause 8.1):

• Sampling Method:

  • Samples must be drawn randomly from the lot as per IS 4905:1968.
  • Number of sheets/tiles to sample is specified in Tables 3 and 4.

• Criteria for Conformity (Clause 1.3, G-1.3):

  • Each sheet/tile tested must meet all requirements.
  • If any defect found in a sheet, it is considered defective.
  • Lot is accepted if defective sheets ≤ permissible number in Table 3, Column 3.

Summary Table (Example for Sheets) - Extract from Table 3

Procedure:

1. Select n sheets randomly (per Table 3).
2. Test each sheet for appearance, dimensions, and other specs.
3. Count defective sheets.
4. Accept lot if defective sheets ≤ c.

flowchart TD
    A[Start: Lot Received] --> B[Random Sampling as per IS 4905]
    B --> C[Select n sheets (Table 3)]
    C --> D[Test each sheet]
    D --> E{Defective sheets ≤ c?}
    E -->|Yes| F[Accept Lot]
    E -->|No| G[Reject Lot]

Note: Refer IS 809 Annex G for detailed tables and test methods.