Methods of test for tensile strength of asbestos fibre

IS 5748 - Scope: Key Specifications & Units

Scope Summary:

• IS 5748 covers test methods and reporting for specific materials (e.g., cement or related products).
• Testing involves 40 specimens, and the average of these is used for results (Clause 7.1).
• Test report must include:
  • Specimen preparation details.
  • Sample identification (name, location, trade name).
  • Date of sampling (Clause 7.3).

Important Units & Conversions (SI Units)

Reporting Table (Clause 7.3)

Summary Diagram

flowchart TD
    A[Test Specimens (40)] --> B[Average Calculation]
    B --> C[Test Results]
    C --> D[Report Preparation]
    D --> E[Include Specimen Prep Details]
    D --> F[Include Sample ID & Location]
    D --> G[Include Sampling Date & Trade Name]

Use this scope and unit framework for test reporting compliance under IS 5748.

IS 5748 - Key Specifications and References

Reporting Test Results (Clause 7.3)

When reporting test results, the following additional information must be included:

• Specimen preparation method
• Sample identification: name, location
• Date of sampling and trade name (if any)

International System of Units (SI Units) Used

Derived Units and Conversions

Summary Diagram: Reporting Test Results

flowchart TD
    A[Test Specimen] --> B[Prepare Specimen]
    B --> C[Identify Sample]
    C --> D[Record Date & Trade Name

IS 5748: Sampling & Preparation of Sample (Summary)

• Sampling Standard: As per IS 4844-1968 for asbestos fiber testing.

• Sample Size:

  • Total samples: 40 samples (Clause 4.1)
  • Weight per sample: approx. 100 g (Clause 4.2)

• Preparation of Test Specimen:

  • Divide each sample into 8 equal parts (Clause 4.3)
  • From each part, remove 5 fibre bundles for testing

• Rounding Off: Follow the revised rules for numerical rounding (specifics in IS 5748 or related annexures).

Quick Reference Table

This procedure ensures representative sampling and uniform preparation for laboratory testing of asbestos fibres.

Preparation of Test Specimen (IS 5748)

Key References:

• Sampling & preparation as per IS 4844-1968 (Clause 3.1)
• Specimen mounting and curing (Clause 4.7)
• Reporting requirements (Clause 7.3)

Specimen Preparation Steps:

• Sampling: Follow IS 4844-1968 for selecting representative samples.
• Specimen Mounting:
  • Place specimen across the center of the slit, perpendicular to its long dimension.
  • Attach ends using adhesive cement up to 1.25 mm thickness.
  • Cure adhesive at room temperature (≤27°C) for minimum 16 hours.
• Number of Specimens: Use an average of 40 specimens for test results (Clause 7.1).

Reporting Data (Clause 7.3):

• Method of specimen preparation.
• Sample identification (name, location).
• Date of sampling and trade name (if any).

Units & Dimensions (SI Units Summary):

Summary Diagram:

flowchart TD
    A[Sampling as per IS 4844-1968] --> B[Specimen Cutting]
    B --> C[Mount on Card (perp. to slit)]
    C --> D[Adhesive Cement Application (≤1.25 mm)]
    D --> E[Curing at ≤27°C for 16 hrs]
    E --> F[Testing of 40 specimens]
    F --> G[Report Preparation]

This ensures uniformity and reliability in test results per IS 5748 standards.

IS 5748: Test Procedure Key Points

• Number of specimens: 40 samples (Clause 4.1)
• Test environment: Relative humidity 65%, temperature 27°C ± 2°C (Clause 5.2)
• Result calculation: Average of 40 specimens (Clause 7.1)

Test Report Requirements (Clause 7.3)

Include:

• Description of specimen preparation
• Sample identification (name, location)
• Date of sampling and trade name (if any)

Units (SI Units as per IS 5748)

Summary Flow of Test Procedure

flowchart TD
    A[Collect 40 specimens] --> B[Condition specimens at 65% RH & 27±2°C]
    B --> C[Conduct tests on specimens]
    C --> D[Calculate average of 40 results]
    D --> E[Prepare test report with required details]

This ensures consistency and reliability in test results as per IS 5748.

IS 5748: Tensile Strength of Asbestos Fibre

Key Formula (Clause 6.1)

[ S = \frac{L}{W} ]

• S = Tensile strength in grams per denier (g/denier)
• L = Breaking load of specimen in grams (g)
• W = Denier of the specimen

Note:
Denier = Weight in grams of 9,000 meters of the fibre.

Important Points

• Tensile strength is calculated for 40 specimens.
• Minimum fibre length for testing: 10 mm (Clause 1.1).
• Breaking load is measured during the test and used in the formula.
• Report results as tensile strength per denier.

Summary Table for Tensile Strength Calculation

This formula standardizes tensile strength to fibre fineness, enabling comparison across samples.

IS 5748: Report of Test Results - Key Points

1. Reporting Requirements (Clause 7.3)

Include the following in the test report:

• Specimen preparation method
• Sample identification (name, location)
• Sampling date and trade name (if any)

2. Test Result Precision (Clause 7.2)

• Report tensile strength to nearest 0.1 g/denier

3. Tensile Strength Formula (Clause 6.1)

[ S = \frac{L}{W} ]

• S = Tensile strength (g/denier)
• L = Breaking load (g)
• W = Denier (weight in grams of 9000 m of specimen)

4. Averaging (Clause 7.1)

• Use the average tensile strength of 40 specimens for final results.

Additional: SI Units Reference (from context)

flowchart TD
    A[Specimen Preparation] --> B[Sample Identification]
    B --> C[Sampling Date & Trade Name]
    C --> D[Testing 40 Specimens]
    D --> E[Calculate Tensile Strength S = L/W]
    E --> F[Average Tensile Strength]
    F --> G[Report Results (nearest 0.1 g/denier)]

This ensures clarity and traceability in test reporting per IS 5748.