Ceramic Tiles - Methods of the test, Sampling and Basis of Acceptance, Part 13: Determination of scratch hardness of a surface according to MOHS (see IS 13630: Parts 1 to 15)

IS 13630 Part 13: Scope Summary

• Scope: This part of IS 13630 covers specific requirements related to structural elements or materials as defined in the standard (usually related to structural steel or concrete elements, depending on the part).

• Rounding Off Rules:
  Per IS 2:1960, all numerical results (test or analysis) must be rounded off to the same number of significant digits as specified in the standard.

• Referenced Standards:
  This part relies on other IS standards for detailed procedures and definitions, ensuring consistency.

Key Points for Compliance

IS 2:1960 Rounding Rules (Summary)

• If the digit to be dropped is <5, leave the last retained digit unchanged.
• If it is >5, increase the last retained digit by one.
• If it is exactly 5, round to the nearest even digit.

flowchart TD
    A[Test or Analysis Result] --> B{Number of Significant Figures?}
    B -->|Match Specified| C[Round off per IS 2:1960]
    C --> D[Final Value]

For detailed formulas or tables, refer to the specific clauses within IS 13630 Part 13 as this section primarily defines scope and rounding conventions.

IS 13630 Part 13 primarily references other standards and specifies rounding rules rather than providing direct formulas or tables.

Key Points from IS 13630 Part 13:

• References:

  • The standard draws heavily on other IS codes (not explicitly listed here).
  • Compliance checks use final values rounded per IS 2:1960.

• Rounding Off Rules (IS 2:1960):

  • Round off the final calculated or observed value.
  • Retain the same number of significant figures as the specified value.
  • Example: If specified value = 12.3 (3 significant figures), round 12.3456 to 12.3.

Practical Implication:

• Always consult referenced IS codes for detailed formulas or tables.
• Use IS 2 for consistent numerical rounding in test or analysis results.

flowchart LR
    A[Test/Analysis Result] --> B[Calculate Final Value]
    B --> C{Round off per IS 2:1960}
    C --> D[Retain same significant figures as Specified Value]
    D --> E[Final Value for Compliance Check]

For detailed formulas, refer to the specific IS codes cited in IS 13630 Part 13.

IS 13630 Part 13: Test Materials & Specifications

1. Test Materials (Mohs' Hardness Scale)

2. Key Specifications for Testing

• Test specimens must be identified with their Mohs' hardness.
• For materials with variable hardness, use the lowest Mohs' hardness value for compliance.
• Results must be rounded off per IS 2:1960 rules, retaining the same significant figures as specified.
• Test report must include:
  • Description of the test specimens (tiles)
  • Mohs' hardness of each specimen

3. Rounding Off Rule (IS 2:1960)

• Round the final test value to the same number of significant digits as the specified value.

Summary Diagram: Testing Process Flow

flowchart TD
    A[Select Test Material] --> B[Determine Mohs' Hardness]
    B --> C{Variable Hardness?}
    C -- Yes --> D[Use Lowest Hardness Value]
    C -- No --> E[Use Measured Hardness]
    D --> F[Round Off Result (IS 2:1960)]
    E --> F
    F --> G[Prepare Test Report]
    G --> H[Include Description & Hardness]

This information ensures standardized hardness testing and reporting for tiles/materials as per IS 13630 Part 13.

IS 13630 Part 13: Test Specimens - Key Points

1. Rounding Off Test Results

• Follow IS 2:1960 rules for rounding numerical values.
• Retain the same number of significant digits as specified in the standard.

2. Test Materials & Mohs' Hardness (Table 3)

3. Test Procedure (Clause 5.7)

• For tiles with variable scratch hardness, record the lowest Mohs' hardness.
• Test report must include:
  • Description of the tiles.
  • Mohs' hardness of each specimen.

Summary Diagram: Test Specimen Evaluation Flow

flowchart TD
    A[Select Tile Specimens] --> B[Perform Scratch Hardness Test]
    B --> C{Variable Hardness?}
    C -- Yes --> D[Record Lowest Mohs' Hardness]
    C -- No --> E[Record Observed Hardness]
    D --> F[Prepare Test Report]
    E --> F
    F --> G[Include Tile Description & Hardness]

Use this standard's hardness scale and rounding rules to ensure consistent and reliable test results for tile specimens.

IS 13630 Part 13 (2006) focuses on test procedures but provides limited direct formulas or tables in the given context. Key points for Test Procedure based on IS and general practice:

Key Specifications for Test Procedure:

• Test Specimens: Should conform to dimensions and preparation as per relevant sub-clauses or referenced standards.
• Rounding Off Results: Follow IS 2:1960 rules:
  • Round final test values to the same number of significant digits as specified in the standard.
• Result Evaluation: Use the final observed or calculated value after rounding to decide compliance.

General Test Procedure Steps (Typical in IS standards):

1. Specimen Preparation: Dimensions, conditioning, and surface finish.
2. Test Setup: Equipment calibration and environmental conditions.
3. Measurement: Use precise instruments, record raw data.
4. Calculation: Apply relevant formulas (if any).
5. Rounding: Round final results per IS 2:1960.
6. Acceptance: Compare with specified limits.

Example: Rounding off (IS 2:1960)

If you need formulas or tables for a specific test (e.g., mechanical, chemical), please specify the test type.

flowchart TD
    A[Test Specimen Prep] --> B[Test Setup]
    B --> C[Measurement]
    C --> D[Calculation]
    D --> E[Rounding (IS 2:1960)]
    E --> F[Result Evaluation]

Summary: IS 13630 Part 13 mandates strict specimen prep, measurement, and rounding rules per IS 2 for test result evaluation.

IS 13630 Part 13 references ISO 10545-1:1995 for the Basis of Acceptance of ceramic tiles, focusing on sampling and test result evaluation.

Key Points on Basis of Acceptance:

• Sampling: Tiles are sampled as per ISO 10545-1, ensuring representative selection for testing.
• Test Result Rounding: Final test values must be rounded according to IS 2:1960 rules.
  • Retain the same number of significant figures as the specified value.
• Acceptance Criteria: Compliance is based on the rounded-off test results matching or exceeding the standard limits.

Typical Acceptance Procedure (summarized):

Rounding Rule Example (IS 2:1960):

flowchart TD
    A[Sampling per ISO 10545-1] --> B[Conduct Tests]
    B --> C[Round Results (IS 2:1960)]
    C --> D{Compare with Specified Limits}
    D -- Pass --> E[Accept Batch]
    D -- Fail --> F[Reject Batch]

This ensures consistent, reliable acceptance of ceramic tiles under IS 13630 Part 13.

IS 13630 Part 13: Test Report Key Points

Test Report Must Include:

• Description of the tiles tested.
• Mohs' hardness value for each test specimen (lowest value if variable).

Important Table: Mohs' Hardness Scale (from Table 3)

Rounding Off Values:

• Follow IS 2:1960 rules.
• Retain same significant digits as specified in the standard.

Summary Flow of Test Report Preparation:

flowchart TD
    A[Select Test Specimens] --> B[Perform Hardness Test]
    B --> C[Record Mohs' Hardness]
    C --> D[Round off values (IS 2:1960)]
    D --> E[Prepare Test Report]
    E --> F[Include Tile Description & Hardness]

This ensures consistent and standardized reporting of tile hardness per IS 13630 Part 13.

Rounding Off Numerical Values as per IS 13630 Part 13

• Final test or analysis results must be rounded off according to IS 2:1960 "Rules for rounding off numerical values."
• The number of significant figures retained in the rounded value should match the number of significant figures in the specified value of the standard.
• This ensures consistency and clarity when verifying compliance.

Key Points from IS 2:1960 (Summary)

• If the digit to be dropped is less than 5, the preceding digit remains unchanged.
• If the digit to be dropped is greater than 5, the preceding digit is increased by 1.
• If the digit to be dropped is exactly 5:
  • If the preceding digit is even, it remains unchanged.
  • If the preceding digit is odd, it is increased by 1.

Example:

Additional Table from IS 13630 Part 13: Mohs' Hardness of Test Materials

This hardness scale helps in selecting appropriate test materials for ceramic tile testing.

flowchart TD
  A[Observed Value] --> B{Check Digit to Drop}
  B -->|<5| C[Preceding Digit Unchanged]
  B -->|>5| D[Preceding Digit + 1]
  B -->|=5| E{Preceding Digit Even?}
  E -->|Yes| C
  E -->|No| D
  C & D --> F[Rounded Value with Same Sig. Figs as Specified]

**Summary