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Limits of Acceptance

INTERWOOLLABS' limits of acceptance have been set as follows by the Management Committee :

AIR-FLOW - LASERSCAN - O.F.D.A. Wool top fineness

Wool top fineness

< 20 microns : +/- 0.30µm
20.01-24 microns : +/- 0.40µm
24.01-28 microns : +/- 0.50µm
28.01-32 microns : +/- 0.60µm
32.01-36 microns : +/- 0.70µm
> 36.01 microns : +/- 0.90µm

PROJECTION MICROSCOPE

Wool top fineness

< 20 microns : +/- 0.50µm
20.01-24 microns : +/- 0.60µm
24.01-32 microns : +/- 0.80µm
32.01 microns : +/- 1.20µm

ALMETER

Apparatuses with automatic grip

Length Hauteur Barbe
< 40 mm (hauteur) 1.0 mm 1.3 mm
40.01-50 mm 1.1 mm 1.4 mm
50.1-65 mm 1.4 mm 1.8 mm
65.1-80 mm 1.8 mm 2.3 mm
80.1 mm 2.3 mm 2.9 mm

It is clear that the results, even obtained from an identical lot and measured by the same laboratory may vary within these limits. Each measurement is affected by some degree of variation and, therefore, no absolute value can in any case be given to a result however precise it may be. Thus INTERWOOLLABS' limits of acceptance, conceived and set on a scientific basis much stricter than the normal testing tolerances set out in the I.W.T.O. Red Book, must be considered in conjunction with a test result which they balance and determine.

The communication of a test result must necessarily be accepted as having limits within it will be recognised as valid.