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

IS 3632 - Scope Summary & Key Points

Scope:

• IS 3632 specifies the method of test for determination of wet volume of asbestos fibre.
• It is used to assess asbestos fibre quality for manufacturing asbestos cement (AC) products.
• It complements related standards:
  • IS 4844-1968: Sampling and preparation of asbestos fibre.
  • IS 5328-1969: Chemical composition determination of asbestos fibre.

Key Specifications

• Test Principle: Measure the wet volume (in ml) of asbestos fibre suspended in water after 2 hours.
• Reporting: Record both the wet volume and the weight of fibre used for the test.
• Equipment: Use a graduated measuring cylinder as per specified standards.

Important Notes

• This test helps define the suitability of asbestos fibre for AC product manufacturing.
• Results rounding should follow IS 2-1960 rules.

Summary Table of Related IS Codes for Asbestos Fibre Testing

flowchart LR
    A[Asbestos Fibre Sample] --> B[Preparation (IS 4844)]
    B --> C[Wet Volume Test (IS 3632)]
    B --> D[Chemical Composition Test (IS 5328)]
    C --> E[Measure wet volume after 2 hours]
    E --> F[Report volume + fibre weight]

This scope ensures quality control in asbestos fibre for AC products by standardizing wet volume measurement.

IS 3632: Apparatus Specifications for Wet Volume Test of Asbestos Fibre

Key Apparatus Details:

• Graduated Glass Cylinder (Clause 2.2)

  • Capacity: 2000 ml
  • Conforms to IS: 878-1956
  • Equipped with a suitable stopper that remains fixed during rotation.

• Inverter (Clause 2.3)

  • Mechanically driven to rotate the glass cylinder at 30 revolutions per minute (rpm)
  • Axis of rotation passes through the centre of the cylinder.

Test Procedure Reference:

• After 2 hours of suspension, record the wet volume (ml) of fibre in water (Clause 5.1).
• Also record the weight of fibre used as per test requirements.

Summary Table of Apparatus:

Notes:

• The apparatus ensures uniform suspension of asbestos fibre for accurate wet volume measurement.
• The stopper design is critical to prevent displacement during inversion.
• Follow IS rounding rules (IS: 2-1960) when reporting results.

flowchart LR
    A[Graduated Glass Cylinder (2000 ml)] --> B[Stopper fixed securely]
    B --> C[Placed in Inverter]
    C --> D[Rotated at 30 rpm]
    D --> E[After 2 hours, measure wet volume]

This setup ensures repeatability and accuracy in determining asbestos fibre wet volume per IS 3632.

IS 3632: Sampling & Test Method Highlights

Sampling:

• Sample must be taken as per IS 4844 - 1968: Method of sampling and preparation of asbestos fibre for laboratory test purposes.
• Ensures representative laboratory test samples.

Test Procedure (Clause 5.1):

• Measure wet volume of asbestos fibre suspended in water after 2 hours.
• Record volume in ml.
• Report the weight of fibre used (as per Clause 4.1).

Specifications:

• Use graduated measuring cylinders for volume measurement.
• Standardized sampling and preparation ensure consistency.

Summary Table for Sampling & Testing

flowchart TD
    A[Sample collection] -->|IS 4844-1968| B[Laboratory test sample]
    B --> C[Prepare fibre suspension in water]
    C --> D[Wait for 2 hours]
    D --> E[Measure wet volume (ml)]
    D --> F[Record fibre weight]
    E & F --> G[Report results]

This ensures uniformity in asbestos fibre testing per IS 3632. For exact sampling details, refer to IS 4844.

IS 3632 - Procedure for Determination of Wet Volume of Asbestos Fibre

Key Steps (Clauses 4.1 & 5.1):

1. Sample Preparation:

   • Weigh 25 g of asbestos fibre.
   • Use a graduated measuring cylinder (capacity 2000 ml).
   • Add distilled water at 27 ± 2°C to 1000 ml mark.
   • Add fibre sample, then fill water to 2000 ml mark.

2. Mixing:

   • Place cylinder in a mechanically driven inverter.
   • Rotate 30 times/min (one complete inversion = 360° rotation).
   • Let stand for 10 minutes.
   • Repeat shaking cycle (30 inversions/min).
   • Place cylinder on a vibration-free surface.

3. Recording:

   • After 2 hours, record the wet volume (ml) of fibre suspended in water.
   • Also report the weight of fibre used.

Important Notes:

• The wet volume indicates fibre suitability for manufacturing asbestos cement products.
• Use distilled water and maintain temperature control.
• Follow IS:2-1960 for rounding off results.

Summary Table:

flowchart TD
    A[Weigh 25 g Fibre] --> B[Add distilled water to 1000 ml]
    B --> C[Add fibre, fill water to 2000 ml]
    C --> D[Rotate 30 times/min (360° each)]
    D --> E[Stand 10 minutes]
    E --> F[Repeat rotation 30 times/min]
    F --> G[Place on vibration-free table]
    G --> H[Record wet volume after 2 hours]

This procedure ensures consistent measurement of asbestos fibre wet volume for quality control.

IS 3632 - Clause 5: Recording of Result

• Sample Weight: Record the weight of asbestos fibre taken (typically 25 g as per Clause 4.1).

• Wet Volume Measurement: After 2 hours of settling post shaking (two cycles of 30 inversions each), record the wet volume of fibre suspended in water in milliliters (ml).

• Procedure Summary:

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

• Reporting: Both weight of fibre and wet volume (ml) must be reported.

Key Notes:

• Complete inversion: 360° rotation to original position.
• Use graduated measuring cylinders accurate to 1 ml.
• Follow IS 2-1960 for rounding off numerical results.

Example Table Format for Recording:

flowchart LR
    A[Weigh 25 g Fibre] --> B[Add Water to 1000 ml]
    B --> C[Add Fibre & Fill to 2000 ml]
    C --> D[Rotate 30 times/min (2 cycles)]
    D --> E[Rest 10 min between cycles]
    E --> F[Stand 2 hours vibration-free]
    F --> G[Record Wet Volume (ml)]

This ensures standardized, reproducible measurement of asbestos fibre wet volume per IS 3632.

IS 3632 - References Summary

Key Related IS Standards:

Important Notes:

• IS 3632 is part of a series on asbestos fibre testing, alongside IS 4844 and IS 5328.
• Rounding off test results must follow IS 2-1960.
• The wet volume of asbestos fibre after 2 hours in water is recorded in ml (Clause 5.1).
• Weight of fibre sample used must be reported.

Useful Contacts:
Indian Standards Institution (Manak Bhavan, New Delhi), regional offices in Bombay, Calcutta, Hyderabad, Kanpur, and Madras.

Summary Diagram of Related Standards

graph LR
    A[IS 3632: Wet Volume Test] --> B[IS 4844: Sampling & Preparation]
    A --> C[IS 5328: Chemical Composition]
    D[IS 459, 1592, 1626, 2096, 2098] --> A
    E[IS 2712, 3007 Part I & II] --> A

This concise reference guide helps locate relevant IS codes for asbestos fibre testing and related products.