This practice covers the use of reference standard cottons for
the standardization of instruments and techniques used to test
cotton fibers in various laboratories.
Standardization may be achieved by application of a correction
factor based on the reference standards, or by modification of the
technique in use.
NOTE 1—When reference standards are used to develop correction
factors, or to adjust an operator's technique, no instrument
calibration processes are involved. The term "Calibration" is
properly used for the application or assignment of permanent scales
or marks to an instrument. Adjustments can be made to specific
instruments and accessories such as orifices, metallic strips, or
cellophane sheets, in order to obtain the prescribed values with a
specific instrument. Since an operator's technique or the
interpretation of a method or procedure is inherently variable, it
cannot be calibrated, that is, assigned a permanent, definite
value. The use of reference standards, however, affords a means for
standardizing techniques and checking the reliability of observed
This practice recognizes two types of reference standards:
(1) calibration cotton standards and (2) working
The instructions included in this practice can be used with
cotton fibers in any form suitable for testing with the particular
instrument to be used.
The instructions in the practice are applicable to cotton fibers
but can also be applied to specific blends of cotton and other
fibers, or to other fibers that can be tested with the instruments
designed for testing cotton fibers. No information is available,
however, to show that test procedures standardized with reference
cotton samples are equally reliable with various cotton fiber
blends or with other fibers.
NOTE 2—Standardization procedures covered in this practice are
recommended for use with the following: Test Methods D1440, D1445,
D1447, and D1448.
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 consult and establish appropriate
safety and health practices and determine the applicability of
regulatory limitations prior to use.