This test method covers the operation of the Turner and Newall (T and
N) wet sieving classifier for
asbestos,(Footnote 2) and a procedure for the determination of fiber
length distribution and fines
(defined in Terminology D 2946) content of milled asbestos fiber
(−74 µm (200 mesh))
sieve described in Specification E 11.
For purposes of estimating length distribution, the test is limited to
samples free from excessive
quantities of non-fibrous particles or contaminants. Quantities
exceeding 0.05 g retained in any
given length fractions are considered excessive.
For comparisons between different fiber grades, only those specimens
which have approximately the
same degree of fiberization as determined by Test Methods D 2752 will
give completely meaningful
This test method is not applicable to ultrafine grades of asbestos
powders which contain little or
no fibers retained on a 74-µm (200 mesh) sieve. This method is
restricted to Quebec
Standard(Footnote 3) grades 4A to 7D inclusive as determined by Test
Method D 3639.
NOTE 1 - This is an alternative procedure to Test Method D 2589.
The values stated in SI units are to be regarded as the standard. The
values given in parentheses
are for information only.
Warning - Breathing of asbestos dust is hazardous. Asbestos and
asbestos products present
demonstrated health risks for users and for those with whom they come
into contact. In addition to
other precautions, when working with asbestos-cement products,
minimize the dust that results. For
information on the safe use of chrysoltile asbestos, refer to "Safe
Use of Chrysotile Asbestos: A
Manual on Preventive and Control Measures."(Footnote 4)
This standard does not purport to address all of the safety concerns,
if any, associated with its
use. It is the responsibility of the user of this standard to
establish appropriate safety and
health practices and determine the applicability of regulatory
limitations prior to use. For a
specific hazard statement, see 1.6.
Footnote 2 - The apparatus is supplied, on a non-profit basis, as a
service to the asbestos
industry by TAF International, Bowdon House, Ashburton Rd. W, Trafford
Park, Manchester M170RQ,
Footnote 3 - Available from the Asbestos Institute, 1300 Sherbrooke
St. West, Suite 412, Montreal
QC, Canada H3A 2M8.
Footnote 4 - Available from The Asbestos Institute,