This standard specifies the method for determining the content of crudeness and grit in asbestos fibre. The procedure involves sieving a dried, weighed sample of the fibre on a specified sieve using a mechanical shaker and calculating the percentage of material retained.
Method of test for determination of crudeness and grit content of asbestos fibre
Quick Reference Values
Test Sieve Size150-micron IS Sieve (Clause 4.1.1)
Mass of test specimen50 ± 0.1 g (Clause 6.1)
Drying temperature105 to 110 °C (Clause 6.1)
Sieving time10 min (Clause 6.2)
Key Formulas
Crudeness and Grit Content, % by mass = (m1 / m) * 100, where m1 is mass of residue and m is mass of test specimen
Practical Notes
WARNING: Asbestos is a hazardous material. All handling and testing must be performed with extreme caution, using appropriate personal protective equipment (PPE) and in a well-ventilated area or fume hood to prevent inhalation of fibres.
Ensuring the sample is dried to a constant mass is critical for accurate results, as moisture content will affect the final weight.
The test quantifies non-fibrous impurities which can negatively impact the properties of the final asbestos-cement product.