Standard Test Method for
Tensile Properties of Single Textile Fibers1

This standard is issued under the fixed designation D 3822; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of 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. Scope

1.1 This test method covers the measurement of tensile
properties of natural and man-made single textile fibers of
sufficient length to permit mounting test specimens in a tensile
testing machine.

1.2 This test method is also applicable to continuous (filament) and discontinuous (staple) fibers or filaments taken from
yarns or tow. When the fibers to be tested contain crimp, or if
the tow or yarns have been subjected to bulking, crimping, or
texturing process, the tensile properties are determined after
removal of the crimp.
NOTE 1—Testing of filaments taken from yarns or tow, included in this
test method was originally covered in Test Method D 2101, that is
discontinued.

1.3 The words “fiber” and “filament” are used interchangeably throughout this test method.

1.4 This test method is also applicable to fibers removed
from yarns, or from yarns processed further into fabrics. It
should be recognized that yarn and manufacturing processes
can influence or modify the tensile properties of fibers.
Consequently, tensile properties determined on fibers taken
from yarns, or from yarns that have been processed into
fabrics, may be different than for the same fibers prior to being
subjected to yarn or fabric manufacturing processes.

1.5 This test method provides directions for measuring the
breaking force and elongation at break of single textile fibers
and for calculating breaking tenacity, initial modulus, chord
modulus, tangent modulus, tensile stress at specified elongation, and breaking toughness.

1.6 Procedures for measuring the tensile properties of both
conditioned and wet single fibers are included. The test method
is applicable to testing under a wide range of conditions.

1.7 As the length of the test specimen decreases, the tensile
strength is likely to increase, but the accuracy of the tensile
properties determined may decrease, which may require the
need to increase the number of test specimens. This is
particularly true for those properties dependent on the measurement of elongation, since the shorter lengths increase the

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