Wool Tops and Sliver Testing
To verify wool quality and quantity on consignments of tops and sliver, SGS provides buyers with test reports and certificates to International Wool Textile Organization (IWTO) standards.
Test requirements often include:
- Condition (moisture content)
- Fiber diameter (diameter of wool)
- Fiber length
- Residues (dichloromethane-soluble matter, fatty matter, nonyl phenol ethoxylate (NPEO) detergent residues)
- Sliver weight/density
- Sliver composition (blends)
- Sliver quality (neps, dark fibers, medullated fibers, vegetable matter)
We can also provide wool measurements on properties such as color, evenness and fiber strength. In addition, we offer specialized testing for conformity assessment on wool tops and polyester-wool blend tops.
While independent testing has been generally uncommon in the industry in the past – primarily because sampling is best undertaken throughout production, demanding extended independent supervision – it is now becoming more common, and is routinely required for specific countries (e.g. Iran).
If you need independent sampling and testing of wool tops and sliver, contact SGS now.Email us
Wool Testing About Us (166 KB)
Wool Testing About Us
Wool Testing Services has been operating in New Zealand as an independent wool quality certification body for over 40 years.
Tops and Sliver (214 KB)
Tops and Sliver
SGS Wool Testing Services issues independent test reports and certificates on consignments of tops and sliver where they are required by buyers. These are routinely required for some specific countries such as Iran.
Conditioned Mass (125 KB)
Conditioned mass is determined by sampling the consignment and determining the actual regain of the sample by oven-drying.
Length After Carding (135 KB)
Length After Carding
The Length After Carding (LAC) test emulates the harshest aspects of commercial semi-worsted processing, and has proven extremely reliable.
Mean Fibre (253 KB)
Mean Fibre Diameter Testing
Mean fibre diameter is normally the most important determinant of raw wool price (Info-bulletin 3.1). Until recently, it was mostly certified using the airflow method detailed in IWTO-28.
Fibre Diameter Distribution (132 KB)
Fibre Diameter Distribution
There has been rapidly increasing interest in diameter distribution data, which is of potential interest to the quality of spinning, as well as indicating the comfort characteristics of apparel wools.
Diameter Length Profile (123 KB)
Diameter Length Profile
The average fibre diameter at increments along the length of wool staples may be important for managing sheep flocks, and in the future may assist in predicting processing performance.
Wool Colour (558 KB)
Traditionally, the colour of wool has been expressed in terms of tristimulus values X, Y and Z. The numbers can be thought of in terms of the brightness of the red, green and blue components. In practice we talk of Y as representing brightness, and the difference between Y and Z (Y-Z) as yellowness.
Residual Ash and Grease (244 KB)
Residual Ash and Grease
Scouring removes most of the unwanted material on greasy wool, but still leaves a very small percentage of dust and residual grease on the fibre.
Staple Length & Strength (163 KB)
Staple Length & Strength
Staple strength indicates how a wool will survive the rigours of processing. Staple length is directly related to combing length, and this therefore is one of the primary specifications.
Bulk (95 KB)
Bulk is the ability of a fibre assembly to hold air, or its space-filling capability.
Commodities Brochure (8328 KB)
Ensure the quality and the quantity of your commodities with SGS
ANALYSE - supply and sell with confidence
SECURE - check and verify
ADD VALUE - manage threats
CERTIFY - certify your success
Info Bulletin IndexWool TestingWool Testing Info Bulletin IndexInfo-bulletins are concise summaries of information relating to specific tests or subjects related to wool testing. Check out our Info-bulletins now. ...
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