IS 11267 : 1985 Method of test for length distribution (wet classification of fibre length) of chrysotile asbestos fibre using Turner and Newall classifier

1 Scope

1.1 This standard specifies the method of test for thedetermination of fibre length distribution and fines content ofmilled chrysotile asbestos fibre by wet classification using Turnerand Newall (T & N) classifier.

1.2 For the purpose of estimating fibre length distribution,this test method is limited to samples free from excessivequantities of non-fibrous particles or contaminants.

1.3 For comparison between different fibre grades, only thosespecimens which have approximately the same degree of fiberizationwill give completely meaningful results.

1.4 This standard is not applicable to ultrafine grades ofasbestos powder which contains little or no fibres retained on 75�m IS Sieve. This standard is restricted to fibre grades4A to 7D inclusive.

Note - The fibre grade classification is based on QuebecStandard (Q.S) designation of chrysotile asbestos grades.

2 References

IS 2 :1960 Rules for rounding offnumerical values

IS 9691 : 1980 Methodof test for length distribution (wetclassification of fibre length) of chrysotile asbestosfibre using Bauer-McNett classifier

IS 4844 : 1968 Methodof sampling and preparation of asbestos fibre forlaboratory test purposes