ASTM D3818-92

Test Method for Linear Density and Maturity Index of Cotton Fibers (IIC-Shirley Fineness Maturity Tester Method (Withdrawn 1999)

SCOPE
1.1 This test method covers the determination of linear density and maturity index of loose randomized cotton fibers by measuring the resistance to air flow of a plug of cotton fibers under two prescribed conditions.  Note 1-For other methods for determining linear density and maturity properties of cotton fibers, see Test Methods D1442, D1448, D1769, D2480, D3817, British Standards BS 2016, BS 3085, and ISO 2403.
1.2 This standard does not purport to address all of the safety problems, 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.

General Information

• Status: Withdrawn
• Publication Date: 31-Dec-1991
• Withdrawal Date: 09-Mar-1999
• ICS: 59.060.10 - Natural fibres
• Technical Committee: D13 - Textiles
• Drafting Committee: D13.11 - Cotton Fibers

Standards Content (Sample)

ASTI DI818 92 0759510 0523580 '729
([b Designation: D 3818 - 92 AMERICAN SOCIETY FOR TESTING AND MATERIALS
191 6 Race St Philadelphia, Pa 191 03
Reprinted from îhe Annual Book of ASTM Standards. Copyright ASTM
li noi listed in the current combined index, will appear in the ne* edition.
Standard Test Method for
Linear Density and Maturity Index of Cotton Fibers (IC-Shirley
Fineness/Maturity Tester)'
This standard is issued under the fixed designation D 38 18; 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.
INTRODUCTION
The porous plug airflow method provides an indirect measure of fiber specific surface, that is,
surface area per unit volume, which depends upon the average fiber perimeter and the average fiber
maturity. If the perimeter is known, then the airflow measurement or micronaire reading may be
related directly to fiber linear density or mass per unit length, which, for a certain perimeter
depends upon the maturity. Conversely, if the maturity is known, then the airflow reading may be
related to the perimeter. In American Upland cottons (Gossypium hirsutum L.) the average fiber
perimeter varies only within a narrow range and so the airflow measurement or micronaire reading
can be taken as an indication of wall thickness and hence maturity for all practical purposes.
Cottons of other types will not necessarily behave in the same manner. For example, American
Pima cottons (Gossypium barbadense L.) have a substantially smaller perimeter than the Upland
types and therefore would give a lower micronaire reading for the same maturity. Asiatic or
cross-bred types would show yet other relationships.
In a dual compression airflow instrument a sample can be measured at two different conditions
of density. Linear density and maturity index can be derived from the measurements of airflow at
the two densities (1, 2, 3, 4).2
D 1448 Test Method for Micronaire Reading of Cotton
1. Scope
Fibers3
1.1 This test method covers the determination of linear
D 1769 Test Method for Linear Density of Cotton Fibers
density and maturity index of loose randomized cotton fibers
(Array Sample)4
by measuring the resistance to air flow of a plug of cotton
D 1776 Practice for Conditioning Textiles for Testing3
fibers under two prescribed conditions.
D2480 Test Method for Maturity Index and Linear
NOTE I-For other methods for determining linear density and
Density of Cotton Fibers by the Causticaire Method3
maturity properties of cotton fibers, see Test Methods D 1442, D 1448,
D3025 Practice for Standardizing Cotton Fiber Test
D 1769, D2480, D3817, British Standards BS 2016, BS 3085, and
Results by Use of Calibration Cotton Standard3
IS0 2403.
D 38 17 Test Method for Maturity Index of Cotton Fibers
By the Fibrograph Method5
1.2 This standard does not purport to address all of the
2.2 British Standards6
safety problems, if any, associated with its use. It is the
responsibility of the user of this standard to establish appro- BS 2016 Determination of Weight per Unit Length of
priate safety and health practices and determine the applica- Textile Fibers
BS 3085 Cotton Fiber Maturity (Estimation by Classifica-
of regulatory limitations prior to use.
bility
tion of Fibers Swollen in Sodium Hydroxide Solution)
2.3 IS0 Standards?
2. Referenced Documents
IS0 1973 Textile Fibers-Determination of Linear Density
2. I ASTM Standards: (Gravimetric Method)
D 123 Terminology Relating to Textiles3
IS0 2403 Textiles-Cotton Fibers (Determination of Micro-
144 1 Practice for Sampling Cotton Fibers for Testing3
D naire Value)
D 1442 Test Method for Maturity of Cotton Fibers (So-
dium Hydroxide Swelling and Polarized Light Proce-
3. Definitions
dure~)~
3.1 calibration cotton standards, n-cotton samples taken
I This test method is under the jurisdiction of ASTM Committee D-13 on
Textiles and is the direct responsibility of Subcommittee D13.1 1 on Cotton Fibers. Discontinued-See 1988 Annual Book of ASTM Standards, Vol 07.02.
Current edition approved Oct. IS, 1992. Published January 1993. Originally 5 Annual Book ofASTM Standards, Vol 07.02.
published as D 3818 - 79. Last previous edition D 3818 - 79 (1984)". 6Available from British Standards Institute, 2 Park Street, London, WiA 2BS
2The boldface numbers in parentheses refer to the list of references at the end UNITED KINGWM.
of this test method. Available from ISO, I Rue de Varembe, Geneva CH-12 I1 20 SWITZER-
3 Annual Book ofASTM Standards, Vol 07.01. LAND.
I

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ASTM D3818 92 0759530 0521581 665
@) D3818
6. Apparatus and Materials
from blended bulk source on which fiber properties have
been determined under the Internation
...