Gurley Cobb Testers

A range of Gurley Cobb Testers, available with a choice of 10, 25 and 100 cm2 rings, roller and blotters. Primary use in the pulp and paper mill.

The Cobb Tester is a simple instrument that measures the water absorptiveness of paper, cardboard and corrugated fibreboard under standard conditions.

The water absorptiveness is a significant parameter in the specification of paper and board for use in the packaging and printing industries.

The cobb sizing test is used worldwide to test absorption or resistance to absorption of water, oil and other liquids.


  • Easy testing of absorption or resistance to absorption
  • Different surface areas can be tested: 10, 25, 50 and 100 cm2

Physical specifications:

  • Cobb:
  • The cobb has a precision machined testing cylinder.
  • The flat lower edge is firmly positioned over the test sample without the risk of leakages or cutting into the test sample.
  • Roll:
  • The conditioning roll has a sliding handle which ensures that only the standard conditioning weight is applied to the test piece.
  • Template:
  • For the quick and accurate preparation of standard test samples.
  • Dimensions:
  • Cobb 15 x 15 x 15 cm
  • Roll 18 x 9.5 x 22 cm
  • Template 12.5 x 12.5 x 3.5 cm

Performance data:

  • Test area (standard) diameter 112.8 mm; 100 cm2
  • Water depth 10 mm
  • Water volume 100 ml
  • Conditioning roll mass 10.0 ± 0.5 kg
  • Diameter of conditioning roll 90 ± 10 mm

Power supply:

  • Manually operated


  • ISO 535, DIN-EN 20535, TAPPI T-441

There are four Cobb Sizing Kits available

Model Description
4180AN Gurley-Cobb Sizing tester with 100 cm2 cylinder
4180BN Gurley-Cobb Sizing tester with 100, 25 and 10 cm2 cylinders
4180CN 4180-A kit with CX00856 Precision Roller and AX05022 Blotting Paper, 250 sheets
4180DN 4180-B kit with CX00856 Precision Roller and AX05022 Blotting Paper, 250 sheets, CX00856 Gurley Precision Roller 10± 0.5kg

Standard Pulp Blotters

For more information, please contact our sales team on 01223 492081 or