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Did you know?

That the yarn fineness, yarn diameter, or the titre of a yarn, a fibre or a filament is expressed as the mass per unit length. The yarn fineness gives no indication of the strength or the volume of a yarn.

A high yarn fineness has a lower ratio of mass to length, whereas a high titre has a higher ratio.

The yarn fineness is measured internationally in tex. This unit has replaced the previous units denier (den), metric number (Nm), and English number (Ne).

Definitions:

1 tex: 1 gram per 1,000 m

1 dtex 1 gram per 10, 000 m (decitex)

1 den: 1 gram per 9,000 m

How thin are microfibres?

“Microfibres” is a collective term for fibres whose individual filaments are finer than one denier. Here are a couple of comparisons to give you an idea: microfibres have half the diameter of silk fibres, one third that of cotton fibres, one quarter that of fine wool fibres, and only one hundredth of the diameter of a human hair. Example: Tactel^®.

Photograph: comparison of a microfibre  with a human hair - click on photo to enlarge → ↑