Since inception, the ProClass commitment to its customers and the wider cotton industry is to, wherever possible, use the world’s best available technology for the process of cotton classing in order to ensure the highest level of confidence in the results. This means we have made a significant investment to make sure we have the best available testing equipment and optimum laboratory conditions in which to conduct testing.
Cotton Testing

It is widely held that the USTER HVI 1000 has established itself as the superior technology on the market. Beginning in 2010 ProClass began the process of expanding and upgrading the HVI fleet. We can now boast a fleet of six HVI 1000’s operating in the Goondiwindi facility and three in the Griffith facility. ProClass is the only classing entity that has this kind of capacity using only the most modern HVI 1000 technology.

HVI Machine
Environment Conditioning

Environment conditions are critical to the cotton testing process.  Worldwide standards dictate that cotton testing laboratories environment conditions be held at a temperature of 21 degrees Celsius (+ or - 1 degree) and humidity of 65% (+ or - 2%).  Samples are kept in these conditions for 24 hours prior to testing to ensure sample moisture content is at the Best Management Practice (BMP) compliance level (6.75% - 8.25%).

To achieve this we have installed state-of-the-art air conditioning systems at both our facilites, comprised of:

  • Carrier Cooling Units (Chiller)
  • Carrier Air Handling & Distribution Units
  • Condiar Humidification Units
  • Carrier Comfortview comfort control software
Collectively these systems currently condition a space large enough to house our nine HVI machines and condition 40,000 samples per day.  It has the capacity to double this if required.
Measurements and Calculations

Micronaire  Micronaire Reading
Measured by relating airflow resistance to the specific surface of fibres.
Length: Upper Half Mean Length, Uniformity Index, Short Fibre Index
Measured optically in a tapered fibre beard which is automatically prepared, carded and brushed.
 Strength: Strength Elongation
Strength is measured physically by clamping a fibre bundle between 2 pairs of clamps at known  distance.  The second pair of clamps pulls away from the first pair at a constant speed until the fibre bundle breaks.  The distance it travels, extending the fibre bundle before breakage, is reported as elongation.
 Moisture: Moisture Content
Moisture content of the cotton sample at the time of testing, using conductive moisture probe.
 Colour: Rd(Brightness), +b(Yellowness), Colour Grade
Measured optically by different colour filters, converted by USDA Upland or Pima Colour Chart to grades.
 Trash: Particle Count, % Surface Area Covered by Trash, Trash Code
Measured optically by utilising a digital camera, and converted to USDA Trash Grades.

Address: 7 Troy Drive, Goondiwindi, QLD, 4390      Tel: +61 7 4671 0333     Fax:  +61 7 4671 1333      Email:

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