Method of test for determination of the wet volume of asbestos fibre
1969 Edition

Overview of IS 3632 Scope

Purpose:

• Defines the laboratory test method to measure the wet volume of asbestos fibre.
• Applied to assess fibre quality for asbestos cement (AC) product manufacturing.
• Complements related standards:
  • IS 4844-1968: Procedures for sampling and preparing asbestos fibre.
  • IS 5328-1969: Determination of asbestos chemical composition.

Key Test Characteristics

• Principle: Determining wet volume (ml) of asbestos fibre suspended in water after 2 hours.
• Reporting: Both wet volume and fibre weight must be recorded.
• Equipment: Use of standardized graduated measuring cylinders.

Additional Remarks

• The test evaluates fibre suitability for AC products.
• Results should be rounded following IS 2-1960 standards.

Related Indian Standards Summary

flowchart LR
    Sample[Asbestos Fibre Sample] --> Prep[Preparation (IS 4844)]
    Prep --> WetVolTest[Wet Volume Test (IS 3632)]
    Prep --> ChemCompTest[Chemical Composition Test (IS 5328)]
    WetVolTest --> Measure[Measure wet volume after 2 hours]
    Measure --> Report[Record volume and fibre weight]

This section ensures standardized quality control for asbestos fibre used in AC products.

IS 3632 Equipment Requirements for Wet Volume Testing

Essential Apparatus Details:

• Graduated Glass Cylinder (Clause 2.2)

  • Volume capacity: 2000 ml
  • Compliance with IS: 878-1956
  • Equipped with a stopper that remains fixed during inversion.

• Mechanical Inverter (Clause 2.3)

  • Device capable of rotating the cylinder at 30 rpm
  • Axis passes through the cylinder's centre.

Test Procedure Notes:

• After suspending asbestos fibre in water, record wet volume (ml) after 2 hours.
• Also note the fibre weight used in the test.

Apparatus Summary Table:

Important Points:

• Apparatus ensures uniform suspension of fibres for accurate volume measurement.
• Stopper design prevents displacement during inversion.
• Result rounding follows IS 2-1960.

flowchart LR
    Cylinder[Graduated Cylinder (2000 ml)] --> Stopper[Stopper Secured]
    Stopper --> Inverter[Placed in Mechanical Inverter]
    Inverter --> Rotation[Rotated at 30 rpm]
    Rotation --> Measure[Measure wet volume after 2 hours]

This configuration guarantees consistency and precision as per IS 3632.

Sampling and Test Preparation According to IS 3632

Sampling Protocol:

• Samples must be obtained following IS 4844-1968, which covers asbestos fibre sampling and preparation for lab testing.
• Ensures representative and consistent samples.

Test Methodology (Clause 5.1):

• Wet volume measured by suspending asbestos fibre in water and recording volume after 2 hours.
• Volume expressed in milliliters.
• Weight of fibre sample noted as per Clause 4.1.

Specifications:

• Use graduated measuring cylinders for volume determination.
• Standardized sampling ensures reproducibility.

Sampling and Testing Summary Table

flowchart TD
    CollectSample[Sample Collection] -->|IS 4844-1968| PrepareSample[Prepare Lab Sample]
    PrepareSample --> Suspend[Create Fibre Suspension]
    Suspend --> Wait[Wait 2 Hours]
    Wait --> MeasureVol[Measure Wet Volume (ml)]
    Wait --> RecordWeight[Record Fibre Weight]
    MeasureVol & RecordWeight --> Report[Document Results]

This process ensures uniform and reliable asbestos fibre testing consistent with IS 3632. Refer to IS 4844 for detailed sampling instructions.

IS 3632 Method for Measuring Wet Volume of Asbestos Fibre

Procedure Overview (Clauses 4.1 & 5.1):

1. Sample Preparation:

   • Accurately weigh 25 grams of asbestos fibre.
   • Use a graduated cylinder with a capacity of 2000 ml.
   • Fill with distilled water at 27 ± 2°C to the 1000 ml mark.
   • Add the asbestos fibre sample, then fill water up to the 2000 ml mark.

2. Suspension and Mixing:

   • Place the cylinder in a mechanical inverter.
   • Rotate at a rate of 30 inversions per minute (one full inversion = 360° rotation).
   • Allow to stand for 10 minutes.
   • Repeat the inversion cycle.
   • Place the cylinder on a stable, vibration-free surface.

3. Measurement:

   • After 2 hours, record the wet volume of the fibre suspension in ml.
   • Also document the fibre weight used.

Notes:

• The wet volume measurement aids in determining fibre suitability for asbestos cement product fabrication.
• Maintain water temperature and use distilled water.
• Round off results as per IS 2-1960.

Procedure Summary Table:

flowchart TD
    WeighFibre[Weigh 25 g Fibre] --> AddWater1[Add Distilled Water to 1000 ml]
    AddWater1 --> AddFibre[Add Fibre Sample]
    AddFibre --> AddWater2[Fill Water to 2000 ml]
    AddWater2 --> Rotate1[Rotate 30 times per minute]
    Rotate1 --> Rest10[Rest for 10 minutes]
    Rest10 --> Rotate2[Repeat Rotation 30 times per minute]
    Rotate2 --> StablePlace[Place on Vibration-Free Surface]
    StablePlace --> MeasureVol[Record Wet Volume after 2 Hours]

This method guarantees a reproducible and accurate wet volume measurement for quality assurance.

Recording Test Outcomes Following IS 3632 Clause 5

• Fibre Weight: Document the weight of asbestos fibre used (commonly 25 g as per Clause 4.1).

• Wet Volume Measurement: After completing two cycles of 30 inversions each and 2 hours settling time, record the wet volume of suspended fibre in milliliters.

• Stepwise Summary:

  1. Weigh 25 g of fibre.
  2. Add distilled water to 1000 ml mark.
  3. Add fibre and fill water to 2000 ml.
  4. Rotate cylinder 30 times per minute twice with a 10-minute interval.
  5. Let stand on a vibration-free surface for 2 hours.
  6. Record wet volume in ml.

• Reporting Requirements: Both the fibre weight and the measured wet volume must be included in the report.

Important Considerations:

• Each inversion corresponds to a 360° rotation returning to the start position.
• Use graduated cylinders with 1 ml accuracy.
• Round values according to IS 2-1960.

Example Format for Recording:

flowchart LR
    WeighFibre[Weigh 25 g Fibre] --> AddWater[Add Water to 1000 ml]
    AddWater --> AddFibre[Add Fibre & Fill to 2000 ml]
    AddFibre --> Rotate[Rotate 30 times/min twice]
    Rotate --> Rest[Rest 10 min between rotations]
    Rest --> Stand[Stand 2 hours vibration-free]
    Stand --> Record[Record Wet Volume (ml)]

This documentation approach ensures uniform and verifiable results for asbestos fibre wet volume testing.

Reference List for IS 3632 and Associated Standards

Key Points:

• IS 3632 is part of a suite of standards addressing asbestos fibre testing alongside IS 4844 and IS 5328.
• Follow IS 2-1960 for rounding off test results.
• Wet volume measurement is taken after 2 hours suspension in water.
• The fibre sample weight used must be reported.

Contact: Indian Standards Institution (Manak Bhavan, New Delhi) with regional branches in Bombay, Calcutta, Hyderabad, Kanpur, and Madras.

Diagram of Related Standards

graph LR
    WetVolTest[IS 3632: Wet Volume Test] --> Sampling[IS 4844: Sampling & Preparation]
    WetVolTest --> ChemComp[IS 5328: Chemical Composition]
    RelatedStandards[IS 459, 1592, 1626, 2096, 2098] --> WetVolTest
    AdditionalStandards[IS 2712, 3007 Part I & II] --> WetVolTest

This reference guide helps users identify associated standards relevant to asbestos fibre testing and products.