Clay flooring tiles-

IS 1478 - Scope & Key Specifications Summary

Scope (Clause 6.1 & 6.2.1)

• Covers dimensions and permissible tolerances for square tiles and half-tiles (rectangular & triangular).
• Half-tiles must combine to match full tile dimensions.
• Permissible tolerances are specified in Clauses 6.2.1 and 6.2.2.

Key Dimensions (Table 2 - Clause 6.1)

• Non-modular sizes included for current use; modular sizes expected in future revisions.

Notes:

• Thickness is the minimum thickness.
• Half-tiles designed to fit exactly half the full tile size.
• Permissible tolerances ensure dimensional accuracy for proper installation.

flowchart TD
    A[Full Tile] --> B[Half Tile 1]
    A --> C[Half Tile 2]
    B & C --> D[Combined = Full Tile Size]

This ensures modularity and consistency in tile laying.

IS 1478 Key References: Flooring Tiles

1. Classification of Flooring Tiles (Clause 8.2, Table 1)

2. Dimensions and Shape (Clause 6.1, Table 2)

• Half-tiles (rectangular/triangular) must combine to match full tile dimensions.
• Non-modular sizes marked with * are transitional; modular sizes preferred.

3. Test Specimens (Annex C, Clause 8.3)

• Specimens must conform to dimensional tolerances as per Clauses 6.2.1 and 6.2.2.
• Testing includes water absorption, flexural strength, and impact resistance.

This summary provides essential tables and specifications for tile classification, dimensions, and testing per IS 1478. For detailed design and quality control, refer to the full clauses.

IS 1478 Key Definitions & Specifications

1. Definitions (Clause 3.1)

• Definitions refer to IS 2248:1992 for terms related to flooring tiles.

2. Dimensions & Shape (Clause 6.1 & 6.2.1)

• Tiles are primarily square.
• Half-tiles (rectangular/triangular) must combine to full tile dimensions.
• Table 2: Tile Dimensions & Minimum Thickness

*Non-modular sizes are in transition to modular sizes.

3. Classification of Flooring Tiles (Clause 8.2)

This concise summary covers key definitions, tile dimensions, thickness, and classification criteria as per IS 1478.

IS 1478: Classification of Flooring Tiles

1. Classification Overview (Clause 4.1 & Table 1, Clause 8.2)

Flooring tiles are classified into Class 1, Class 2, and Class 3 based on:

2. Dimensions (Clause 6.2.1)

• Length and breadth of tiles shall conform to specified tolerances (refer IS 1478 for exact dimensional limits).

Summary:

• Class 1 tiles have the highest quality (lowest water absorption, highest strength and impact resistance).
• Class 3 tiles are for lighter usage with relaxed requirements.
• Testing per Clause 8 ensures compliance with these classifications.

flowchart TD
    A[Flooring Tiles] --> B{Classification}
    B --> C[Class 1: High Quality]
    B --> D[Class 2: Medium Quality]
    B --> E[Class 3: Basic Quality]

    C --> F[Water Absorption ≤ 10%]
    C --> G[Flexural Strength ≥ 6 kg/cm width (avg)]
    C --> H[Impact Resistance: 15 mm thick - 25 mm drop]

    D --> I[Water Absorption ≤ 19%]
    D --> J[Flexural Strength ≥ 3.5 kg/cm width (avg)]
    D --> K[

IS 1478: General Quality for Flooring Tiles

Key Specifications (Table 1 - Clause 8.2)

Additional Notes:

• Sampling & Identification (Clause 7.3): Manufacturer must provide facilities and labor for sampling.
• Test Specimens (Clause 6.2.2): Thickness is critical for impact resistance classification.
• Non-Compliance (Clause 8.3): Tiles failing tests must be addressed per Annex C.

Summary:

• Use water absorption and flexural strength to classify tile quality.
• Impact resistance depends on tile thickness and steel ball drop height.
• Always verify thickness and provide proper sampling facilities.

flowchart TD
    A[Tile Sample] --> B{Check Water Absorption}
    B -->|≤10%| C[Class 1]
    B -->|>10% & ≤19%| D[Class 2]
    B -->|>19% & ≤24%| E[Class 3]
    C --> F[Check Flexural Strength & Impact]
    D --> F
    E --> F
    F --> G{Pass Tests?}
    G -->|Yes| H[Accept Tile]
    G -->|No| I[Reject or Reprocess]

IS 1478: Dimensions and Shape of Ceramic Tiles

Key Specifications (Clause 6.1 & 6.2)

• Tile Sizes & Minimum Thickness (Table 2):

* Non-modular sizes included due to current use; modular sizes are preferred.

• Half-Tiles: Rectangular or triangular half-tiles should combine to match one full tile dimension exactly.

Tolerances (Clause 6.2.1 & 6.2.2)

• Length and breadth tolerances are specified to ensure dimensional accuracy (refer IS 1478 Clause 6.2.1).
• Thickness tolerances ensure uniformity (refer Clause 6.2.2).

Summary Diagram of Tile Dimensions:

graph TD
    A[Full Tile] --> B[Half Tile 1]
    A --> C[Half Tile 2]
    B & C --> D[Combined = Full Tile Dimensions]

Note: Tiles must maintain consistent length, breadth, and thickness within specified tolerances for proper fitting and durability.

IS 1478 - Sampling for Tile Testing

Sampling Procedure (Clause 7.2)

• Sample size: Minimum 6 tiles per 1,000 tiles or fraction thereof in a lot.
• Minimum per lot: At least 15 tiles must be selected for testing.
• Sampling done randomly by purchaser (or representative) in presence of manufacturer (or representative).
• Additional specimens may be taken at purchaser's discretion.

Facilities (Clause 7.3)

• Manufacturer/supplier must provide all labor and facilities for sampling and identification.
• Sampling must ensure tiles are properly identified and traceable.

Test Specimens (Clause 8.3 & Annex C)

• From the sample, 6 tiles are used specifically for the steel ball impact test.
• Steel ball drop height and test details are per Table 1 (not fully provided here).
• For non-square tiles, drop height is agreed upon by purchaser and vendor.

Summary Table for Sampling

flowchart LR
    A[Start: Lot of Tiles] --> B{Lot size > 1000?}
    B -- Yes --> C[Sample 6 tiles per 1000 tiles or fraction]
    B -- No --> D[Sample 6 tiles]
    C --> E{Total sample < 15?}
    E -- Yes --> F[Increase sample to 15]
    E -- No --> G[Proceed with sampling]
    D --> G
    F --> G
    G --> H[Select 6 tiles for steel ball test]

Note: Refer to Table 1 of IS 1478 for steel ball test parameters.

IS 1478: Details of Tests - Key Points

1. Flexural Strength Test (Annex B, Clause 8.2)

• Test Specimens: As per B-1, usually 3 specimens.
• Result Expression: Flexural strength expressed in N/mm width.
• Formula:

[ \text{Flexural Strength} = \frac{P \times L}{b \times d^2} ]

Where:

• (P) = Load at fracture (N)
• (L) = Span length (mm) (depends on tile size)
• (b) = Breadth of tile (mm)
• (d) = Depth/thickness of tile (mm)

2. Transverse Test Setup (Fig. 3)

• Apparatus includes Bearers A and B supporting the tile at a span (X) (tile size dependent).
• Load applied centrally until fracture.

3. Impact Test (Clause 7.3)

• A steel ball is dropped from a specified height.
• No fracture allowed under the height specified in Table 1.
• For non-square tiles, ball drop height is agreed upon by purchaser and vendor.

4. Sampling (Clause 7.3)

• Manufacturer must provide facilities and labor for sampling and identification.

Summary Table (Example)

flowchart LR
    A[Tile Specimen] --> B[Supported on Bearers A & B]
    B --> C[Load Applied at Center]
    C --> D{Fracture?}
    D -- Yes --> E[Record Load & Calculate Flexural Strength]
    D -- No --> F[Pass Impact Test]

Note: Refer to IS 1478 Table 1 for specific steel ball drop heights and span lengths based on tile size.

IS 1478: Non-Compliance with Tests — Key Points

Clause 9: Non-Compliance with Tests

• Sampling & Testing:
  • If any tile in the first sample fails any test (Clause 8), a second sample is drawn and tested.
  • If any tile in the second sample also fails, the entire lot is rejected.

Clause 10: Independent Test & Cost

• Manufacturer provides test tiles free of charge.
• Cost of testing borne by:
  • Manufacturer, if tiles fail the standard.
  • Purchaser, if tiles pass the standard.

Table 1 (Summary for Steel Ball Test)

Summary Flowchart of Non-Compliance Testing Process:

flowchart TD
    A[Sample 1 Testing] -->|Pass| B[Lot Accepted]
    A -->|Fail| C[Sample 2 Testing]
    C -->|Pass| B
    C -->|Fail| D[Lot Rejected]

Note: Refer Clause 7.3 for sampling facilities and Clause 8 for detailed test methods.

IS 1478: Independent Test Key Points (Clause 8.3, Annex C)

Test Setup (Clause 3.1, B-3.1)

• Specimens: 3 tiles dried (100–110°C till constant weight), 3 tiles soaked (24–30°C water for 24 hrs).
• Support: Tiles placed flatwise on bearers with span = 3/4 × tile dimension.
• Load Application: Perpendicular to span, uniform rate of 450–550 N/min.
• Bearers: Use packing to ensure uniform load distribution.

Calculation of Flexural Strength (Clause 8.2, Annex B)

• Flexural strength (σ) expressed in N/mm width.
• Span (X) = span as per tile size (3/4 tile dimension).

Formula for Flexural Strength:

[ \sigma = \frac{3PL}{2bd^2} ]

Where:

• (P) = Load at fracture (N)
• (L) = Span length (mm)
• (b) = Width of tile (mm)
• (d) = Thickness of tile (mm)

Apparatus (Fig. 3)

• Bearers A & B support tile flatwise.
• Load applied centrally.

flowchart LR
    A[Tile Specimen] -->|Placed flatwise| B[Bearers (Span = 3/4 tile size)]
    B --> C[Load applied perpendicular at center]
    C --> D[Measure Load at fracture (P)]
    D --> E[Calculate Flexural Strength σ = 3PL / 2bd²]

Summary:

• Dry and soaked tiles tested.
• Span = 3/4 tile size.
• Load rate = 450–550 N/min.
• Flexural strength calculated in N/mm width using standard formula.

IS 1478: Certificate of Compliance - Key Points

• Clause 11.1:
  The manufacturer must ensure tiles conform to IS 1478 requirements and, if requested, provide a Certificate of Compliance to the purchaser or representative.

• Testing & Costs (Clause 10.2):

  • Manufacturer supplies tiles for testing free of charge.
  • If tiles fail, manufacturer bears test costs.
  • If tiles pass, purchaser bears test costs.

• Sampling & Identification (Clause 7.3):
  Manufacturer/supplier must provide facilities and labor for sampling and identification during testing.

• Test Specimens (Annex C, Clause 8.3):
  Tiles must be tested per standard procedures; e.g., steel ball impact test height per Table 1 (not provided here).

Summary Table: Responsibilities for Testing Costs

Certificate of Compliance Includes:

• Confirmation that tiles meet IS 1478 requirements
• Reference to test results and standards met
• Manufacturer's signature and date

This certificate assures quality and compliance before purchase or use.

IS 1478: Marking Specifications for Tiles

• Clause 12.1:

  • Each tile shall be legibly and indelibly marked with the manufacturer's name or trademark.
  • Marking area shall not exceed 5% of the tile surface area.

• Clause 12.1.1:

  • Tiles may also bear the Standard Mark issued by BIS, indicating compliance with IS 1478 under BIS supervision.

• Standard Mark Usage:

  • Governed by the Bureau of Indian Standards Act, 1986.
  • Indicates quality assurance via inspection, testing, and continuous conformity checks by BIS.

Summary Table for Marking Area

Notes:

• Marking must be legible and permanent (indelible).
• Standard Mark usage requires a license from BIS.

flowchart LR
    A[Tile] --> B[Marking: Manufacturer Name/Trademark]
    B --> C{Marking Area ≤ 5% of Tile Surface}
    C --> D[Marking is Legible & Indelible]
    A --> E[Optional: BIS Standard Mark]
    E --> F[Indicates BIS Certification & Quality Assurance]

This ensures traceability and quality compliance per IS 1478.

IS 1478: Water Absorption Test for Ceramic Tiles

Key Formula (Clause 3.1, A-3.1)

[ \text{Percentage Water Absorption} = \frac{B - A}{A} \times 100 ]

• A = Weight of dry specimen (g)
• B = Weight after 24 hours immersion in cold water (g)

Procedure Summary (Annex A, Clause 8.1)

• Test 6 tiles as specimens.
• Immerse tiles in cold water for 24 hours.
• Measure weights before and after immersion.
• Calculate individual water absorption percentages.
• Report the average of six tiles (Clause A-3.2).

Specification (Clause 8.1, Table 1)

Summary

• Use the formula to find % water absorption per tile.
• Average over 6 tiles.
• Confirm compliance with Table 1 limits.

flowchart LR
    A[Dry Tile Weight (A)] --> C[Immerse 24 hrs in Water]
    C --> B[Wet Tile Weight (B)]
    B --> D[Calculate % Water Absorption = ((B-A)/A)*100]
    D --> E[Repeat for 6 Tiles]
    E --> F[Average % Water Absorption]
    F --> G[Check Against Table 1 Limits]

This ensures tiles meet durability and quality standards per IS 1478.

IS 1478 - Determination of Flexural Strength (Clause 8.2, Annex B)

Key Specifications:

• Test Specimens: 6 tiles (3 dry + 3 wet condition)
• Test Method: Annex B describes the flexural strength test procedure.

Flexural Strength Calculation:

[ \text{Flexural Strength} = \frac{\text{Breaking Load}}{\text{Width of Tile}} ]

• Calculate flexural strength for each tile.
• Take the average of all six values.

Requirements:

• Average flexural strength of six tiles must meet Table 1 requirements (refer IS 1478 for specific values).
• Tests conducted at recognized labs (Concrete and Soil Research Lab, Madras; Central Building Research Institute, Roorkee).

Summary Table (Example format):

This ensures durability and performance of tiles under flexural loads in both dry and wet states.

IS 1478: Impact Resistance Test - Key Points

Apparatus (Clause 2.1)

• Steel ball: Diameter = 35 mm, Mass = 170 g
• Ball held by clamp on upright stand, released by slightly widening clamp jaws.
• Ball falls vertically onto tile specimen.

Test Procedure (Clause 8.3, C-3.2)

• Initial drop height = 7.5 cm
• Increase drop height in increments of 7.5 cm until tile fractures.
• Record the height at which fracture occurs.

Result Evaluation (Clause 4.2)

• Impact resistance expressed as:

[ \text{Impact Resistance} = \frac{\text{Force}}{\text{Width of tile (mm)}} \quad \text{(N/mm width)} ]

• Force corresponds to the impact energy at fracture height:

[ E = m \cdot g \cdot h ]

where
(m = 0.17 , kg),
(g = 9.81 , m/s^2),
(h = \text{height of drop (m)}).

Summary Table for Drop Heights

flowchart TD
    A[Clamp holds steel ball] --> B[Release ball from height h]
    B --> C[Ball impacts tile specimen]
    C --> D{Tile fractures?}
    D -- No --> E[Increase height by 7.5 cm]
    E --> B
    D -- Yes --> F[Record fracture height h]
    F --> G[Calculate impact energy E = mgh]
    G --> H[Express result as N/mm width]

Note: Ensure tile span and width are measured accurately for result normalization.