ASTM D2260 : 03(2013)

Standard Tables of Conversion Factors and Equivalent Yarn Numbers Measured in Various Numbering Systems

Standard Details

1.1 These tables include (1) a series of conversion factors required to convert the number of a yarn measured in a specific system to the equivalent number measured in various other systems (see Table 1), and (2) specific equivalent numbers for yarns measured in various systems (see Table 2).

TABLE 1 Conversion Factors for Converting from One Yarn Numbering System to Another^A

System for Which Yarn Number is Needed	System for Which Yarn Number is Known
System for Which Yarn Number is Needed	Tex^B		Denier	American Grain Count	Cotton Count	Worsted Count	Woolen Run	Metric Count	Linen Lea Woolen Cut	Yd/lb
Tex^B (g/1000 m)	tex =	...		0.590 541 × gr
Denier (g/9000 m)	den =	9 × tex	...	5.314 87 × gr
American Grain Count (grains/120 yd)	gr =			...
Cotton count (840 yd lengths/lb)	cc =				...			0.590 541 × mc
Worsted count (560 yd lengths/lb)	wc =				1.5 × cc	...		0.885 812 ×mc
Woolen run (1600 yd lengths/lb)	wr =				0.525 × cc	0.35 × wc	...	0.310 034 × mc	0.187 5 ×lea
Metric count (1000 m/kg)	mc =							...
Linen lea (300 yd lengths/lb)	lea =				2.8 × cc	1.866 67 × wc	0.187 5 × wr	1.653 52 × mc	...
Yards per pound (yd/lb)	y =				840 × cc	560 × wc	1600 × wr	496.055 × mc	300 × lea	...

^A The conversion factors are based on the following relationships given in Metric Practice SI 10SI10: 1 yard = 0.9144 m, exactly, and 1 lb (avoirdupois) = 0.453 592 37 kg, exactly. The conversion factors in Table 1 containing fewer than six significant digits are exact values.

^B Multiples and submultiples of this basic unit may be used as a convenience to avoid large numbers or decimal fractions. For example, decitex (dtex) or tex × 10 is suitable for fine yarns and fibers; millitex (mtex) or tex × 1000 is suitable for fibers; while kilotex (ktex) or tex/1000 is often used for ropes, cords, rovings, tops, and slivers.

Examples of Table 1 use:

1) The English worsted count equivalent to a cotton count of 10 is 1.5 times 10, or 15 English worsted count.

2) The cotton count equivalent to 30 tex is 590.54 divided by 30, or 19.7 cotton count.

1.2 The content is basically consistent with recommendations of the International Organization for Standardization (ISO) Standard 2947.

1.3 The values stated in inch-pound units are to be regarded as standard. The values given in parentheses are mathematical conversions to SI units that are provided for information only and are not considered standard.

1.4 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.