Why are there 4 different Yield results on my Certificates and in the catalogue?

The Yield predicts the amount of useable fibre available for the processor. As wool is processed in different ways, there are four different Yield calculations as follows:

• IWTO Schlumberger Dry Top and Noil Yield is the most commonly used commercial Core Test yield. It predicts the amount of Top and Noil that can be combed from greasy wool, and is the main yield basis for wools traded in Western Europe.
• IWTO Scoured Yield estimates the "washing yield", i.e. the yield of product obtained after scouring but before any processing occurs to remove Vegetable Matter. It is commonly used in trade with China and Eastern Europe.
• Japanese Clean Scoured Yield estimates the amount of clean wool available after scouring and is the normal basis for trade with Japan. Although this yield has Vegetable Matter deducted, no allowance is made for the fibre loss which would occur during processing.
• Australian Carbonising Yield is popular in Australia, Japan, Korea and Belgium as the basis for trade in carbonising and carding types (lox, crutchings, lambs etc). The yield calculation allows for the expected processing losses during carbonising.