Textile Fiber Formulas

Commonly used fibre formulas and reference guides used by the textile fibre industry.

NameDescription
Micronaire value of cotton (Micrograms per inch)Average weight of 1 inch of fibre in Micrograms (1/1000,000 gms)
Denier (for man-made fibres)Weight in gms per 9000 metres of fibre
Micron  (micro-metre)  (μm) (fibre diameter) (normally for Wool)0.001 mm
Denier0.354  x Micronaire value
Micronaire Value2.824 x Denier
Fibre diameter ( μ ) 11.3 x √ ( dtex / sp.gr) =  11.9 x √ (den / sp.gr)
Tenacity values: Kg / mm29 x (g/den) x Sp.gr. = RKM value x Sp.gr. = (g/tex) x Sp.gr.

Tenacity Conversion

Tenacity Conversions (Free Strength) g = gms

g/deng/texg/dtexcN/tex
g/den1( g/tex ) / 9( g/dtex ) x 10 / 9( cN/tex ) x 0.113
g/tex( g/den ) x 91( g/dtex ) x 10( cN/tex ) x 1.02
g/dtex( g/den ) x 0.9( g/tex ) / 101( cN/tex ) x 0.102
cN/tex( g/den ) / 0.113( g/tex ) / 1.02( g/dtex ) / 0.1021

2 thoughts on “Textile Fiber Formulas”

  1. Could you please define some terms here? What is a “tex” and what are the units? Conversion to standard SI units (Newtons, grams, etc) would be very helpful.

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