Standard Test Method for
Asbestos Strength Units1
This standard is issued under the fixed designation D 3880; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of the last revision. A number in parentheses indicates the year of last reapproval. A
superscript epsilon (e) indicates an editorial change since the last revision or reapproval.
1.1 This test method gives a procedure for the evaluation of
the strength-giving properties of asbestos fibers used to reinforce asbestos-cement products.
1.2 The purpose of this test method is to determine the
number of strength units that may be assigned to the sample
1.3 Asbestos fiber possesses the ability to impart strength to
an asbestos-cement product. Every fiber grade may be regarded
as possessing a certain quantity of strength-giving units. The
quantity of fiber required in an asbestos-cement composition
varies inversely with the number of strength units it possesses.
For example, if an amount, designated by X, of a fiber
possessing 100 strength units produces a product of a given
strength, 2X would be required to produce a product of
equivalent strength from fiber possessing only 50 strength
1.4 The following definition is the basis for the strength unit
test: An asbestos fiber that gives the standard strength at the
standard density when used as 10 % of the furnish is defined as
having 100 strength units. Therefore, by knowing the percent
fiber required in the mix to give standard strength at the
standard density, it is possible to calculate the strength units of
a sample of asbestos.
1.5 This procedure is intended primarily for chrysotile
asbestos; it has not been verified whether or not it is applicable
to other types.
1.6 The values stated in SI units are to be regarded as the
standard. The values given in parentheses are for information
1.7 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 specific
precautionary statements see 8.1.1, 9.2.2, and Note 6.
2. Referenced Documents
2.1 ASTM Standards:
Click below to download Astm D 3880 – 90 (Reapproved 1999) pdf free
Click here to download Astm D 3879 – 91 (Reapproved 1999) Pdf Free Download