IS 11267-1985 CHR Test Method for Length Distribution of Heterogeneous Asbestos Fibers (Wet Classification of Fiber Length) Using TURNER and NEWALL Classifiers
1.1 This standard specifies the method of test for the determination of fibre length distribution and fines content of milled chrysotile asbestos fibre by wet classification using Turner and Newall ( T & N ) classifier.
1.2 For the purpose of estimating fibre length distribution, this test method is limited to samples free from excessive quantities of non-fibrous particles or contaminants.
1.3 For comparison between different fibre grades, only those specimens which have approximately the same degree of fiberization will give completely meaningful results.
1.4 This standard is not applicable to ultrafine grades of asbestos powder which contains little or no fibres retained on 75 μm IS Sieve. This standard is restricted to fibre grades 4A to 7D inclusive.
Note — The fibre grade classification is based on Quebec Standard ( Q. S ) designation of chrysotile asbestos grades.
IS 11267-1985 history
1985IS 11267-1985 CHR Test Method for Length Distribution of Heterogeneous Asbestos Fibers (Wet Classification of Fiber Length) Using TURNER and NEWALL Classifiers