# Yarn Numbering System

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Yarn numbering systems
Tex-System

Swicofil indicates the counts of their yarns by means of the Tex-system.

Tex Units

Term
Definition

Basic Tex Unit [tex]
Mass of yarn in grams per 1000 meters length

Decimal fraction
Mass of yarn in grams per 10'000 meters length

Decitex [dtex]
1 g / 10'000 m = 1/10 tex
Decitex is the count grading for filament and spinning yarns recognized by all international bodies in the man-made fibres industry.

Decimal multiple
Mass in kilograms per 1000 meters length.

Kilotex [ktex]
1 kg / 1000 m = 1000 tex)
Kilotex is used to state the counts of spinning tow and similar semi-finished and finished products.

Other numbering Systems

Count denier [den]
Mass of yarn in grams for length of 9000 meters

Metric yarns number [Nm]
Length in meters per 1 gram of mass

English cotton yarn number [Ne or ECC)]
Number of 840 yards strands per 1 English pound of mass

Wool runs
Number of 1600 yards strands per 1 English pound of mass

Wool, worsted (NeK)
Number of 560 yards strands per 1 English pound of mass

Wool, woolen measure (NeS)
Number of 256 yards strands per 1 English pound of mass

Linen Count (NeL or Lea)
Number of 300 yards strands per 1 English pound of mass

Spun Silk
Number of 840 yards strands per 1 English pound of mass

An interactive Conversion table can be found here
Worsted wool is nothing to do with worsted weight yarn. Worsted wool is wool which is carded and combed so that all the fibres are parallel. Woolen measure or Yorkshire wool is carded but not combed, so is a little rougher. Worsted wool is usually very fine and used for suits and fine fabric. Hand knitting yarn is usually woolen type yarn. When quoting wool some manufacturers specify "worsted" or "woolen". Most do not!

Conversion Formulas for the various numbering systems

convert into known tex decitex (dtex) denier (den)
Metric No.
(Nm)
English Cotton No.
(Ne)

tex 10 x tex

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