IH CALIBRATION STANDARDS

INTERWOOLLABS' activities have been crowned by official recognition from the International Wool Textile Organisation of its IH calibration standards as official I.W.T.O. calibration standards for Air-Flow, Projection Microscope, Laserscan and O.F.D.A. measurement apparatus.

The first series was established in 1972. It was the result of the most extensive testing and retesting that significant quantities of standard wool tops have been established. Limited to a maximum duration of 3 years, this series has replaced by seventeen further series, each of them having been valid for a period progressively reduced to 2 years. The 21st Series will be valid until 31 January 2018, with respective finenesses as follows:

22nd SERIES OF IH-STANDARDS (Valid : 01.02.2018 - 31.01.2020)

Standard Values to be used for the calibration of the Instruments for the fibre diameter measurements

STANDARD VALUES

Standard
No.
Mean fibre
diameter
(µm)
Mean fibre
diameter
(µm)
Distribution
of fibre
diameter
(CV %)
Fibre
Curvature
(deg/mm)
1 PMnot applicable15.5318.6480
1 AF16.46not applicablenot applicablenot applicable
218.8618.7318.8969
320.7420.6620.2966
424.3124.2922.4362
526.7926.5723.2958
631.4731.6522.1848
732.5932.6025.5747
835.4335.3725.0746

Eight Tops are required to calibrate Airflow (IWTO-6), Laserscan (IWTO-12) and OFDA (IWTO-47).

  • To calibrate Airflow Instruments, tops “1AF” and “2” to “8” only shall be used.
  • To calibrate Laserscan and OFDA instruments, tops “1PM” and “2” to “8” shall be used. Do not use top “1AF”.

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