World Library  
Flag as Inappropriate
Email this Article

Wool measurement

Article Id: WHEBN0006600198
Reproduction Date:

Title: Wool measurement  
Author: World Heritage Encyclopedia
Language: English
Subject: Wool classing, Staple (wool), Comeback (sheep), Sheep, Glossary of sheep husbandry
Publisher: World Heritage Encyclopedia

Wool measurement

An ultra-fine, 14.6 micron Merino fleece.

A micron (micrometre) is the measurement used to express the diameter of a wool fibre. The lower microns are the finer fibres. Fibre diameter is the most important characteristic of wool in determining its greasy value.

Every fleece comprises a very wide range of fibre diameters—for example a typical Merino fleece will contain fibres of as low as 10 microns in diameter, and there could be fibres with diameters exceeding 25 microns, depending on the age and health (or nutrition) of the sheep. What is usually referred to as wool's "micron" is the mean of the fibre diameters or average diameter. This may be measured in a number of different ways.

Small samples can be taken from the side or fleece of a sheep and measured using a portable instrument such as an OFDA2000 (Optical Fibre Diameter Analyser); or a mobile instrument system called a Fleecescan. Both these systems have been studied extensively and used correctly should give reasonably reliable results. Pre wool classing micron test results are a useful guide for classers in determining lines of wool to be made. Samples of fleece can also be shorn from the animal and sent to a laboratory for measurement ("midside sampling"). Most fleece-testing laboratories nowadays use related instruments to those mentioned—either the OFDA models or the Laserscan. Merino stud rams are mid-side sampled and the test results are displayed in the sale catalogues.

Once the fleeces are baled and prepared for sale as lots, they are commonly sampled by coring in the broker store and the samples sent to certification laboratories. Here the core samples are cleaned, dried and prepared for measurement under strict test methods. Merino wools are normally measured on Laserscan instruments in Australia, New Zealand and South Africa, although OFDA instruments may also be used in some cases (the results from these two types of instrument are quite similar). The “coefficient of variation of fibre diameter” (CVD) is a measure of the variation in fibre fineness within the sample fleece, relative to the average fibre diameter. Crossbred and coarse wools are often measured for mean fibre diameter by older instruments—"Airflow" in many parts of the world, and even a projection microscope in some cases.

Weaner and hogget wool is finer and generally more valuable than the wool from older sheep. Most wool between 11.5 and 24 microns in fibre diameter is made into clothing. The remainder is used for other textiles such as blankets, insulation and furnishings.

The finest bale of wool ever auctioned sold for a seasonal record of 269,000 cents per during June, 2008. This bale was produced by the Hillcreston Pinehill Partnership and measured 11.6 microns, 72.1% yield and had a 43 Newtons per kilotex[1] strength measurement. The bale realised $247,480 and was exported to India.[2]

In 2010 a soft ultra-fine, 10 micron fleece, from Windradeen, near Pyramul, New South Wales set a new world record in the fineness of wool fleeces when it won the Ermenegildo Zegna Vellus Aureum International Trophy.[3]

See also


  1. ^ Kilotex
  2. ^ Country Leader, NSW Wool Sells for a Quarter of a Million, 7 July 2008
  3. ^ Country Leader, 26 April 2010, Finest wool rewarded, Rural Press, North Richmond
  • "The Australian Wool Industry" by Australian Wool Corporation, January 1989
  • The Australian Wool Testing Authority - Yield & Diameter testing:
This article was sourced from Creative Commons Attribution-ShareAlike License; additional terms may apply. World Heritage Encyclopedia content is assembled from numerous content providers, Open Access Publishing, and in compliance with The Fair Access to Science and Technology Research Act (FASTR), Wikimedia Foundation, Inc., Public Library of Science, The Encyclopedia of Life, Open Book Publishers (OBP), PubMed, U.S. National Library of Medicine, National Center for Biotechnology Information, U.S. National Library of Medicine, National Institutes of Health (NIH), U.S. Department of Health & Human Services, and, which sources content from all federal, state, local, tribal, and territorial government publication portals (.gov, .mil, .edu). Funding for and content contributors is made possible from the U.S. Congress, E-Government Act of 2002.
Crowd sourced content that is contributed to World Heritage Encyclopedia is peer reviewed and edited by our editorial staff to ensure quality scholarly research articles.
By using this site, you agree to the Terms of Use and Privacy Policy. World Heritage Encyclopedia™ is a registered trademark of the World Public Library Association, a non-profit organization.

Copyright © World Library Foundation. All rights reserved. eBooks from Project Gutenberg are sponsored by the World Library Foundation,
a 501c(4) Member's Support Non-Profit Organization, and is NOT affiliated with any governmental agency or department.