IGT Cobb Sizing Tester

The SFT 03t models are absorbency-testing devices used for determining the absorption of liquids, such as water, aqueous solutions, oils, varnishes and others, by paper, cardboard and corrugated cardboard from the top and bottom sides within a predetermined time.

  • The Cobb Sizing SFT 03t model is used for determining water absorption according to COBB DIN EN 20 535. It can be used for paper and cardboard.
  • The Cobb Sizing SFT03t 22 model can handle building boards with a thickness up to 22mm.

The SFT 03t consists of the following elements:

  • Base plate with pillow block that holds a stopwatch
  • Container with cover
  • Handle to rotate the container unit 180 degrees
  • Container lock (tension adjustable for samples with a different thickness)

The standard SFT 03t model is delivered with the following parts:

Quenching roller Quenching plate Electronic timer
Sample cutting template Blotting paper 100 ml measuring cup


  • Clean and quick handling, no leakage
  • Quick and easy positioning of sample with help of container lock
  • Lock device adjustable to test paper and cardboard with different thicknesses
  • Very precise time measurements because of automated integrated stopwatch (enables very short time measurements)
  • Pre-set time selection of three different time periods

A sample is prepared and weighted and the time of the cobb test measurement is set on the electronic stopwatch.
The liquid container is filled with the test liquid and the sample is positioned between the container and the cover.
The container and cover are locked and with the help of the handle, the container is rotated 180 degrees, after which the stopwatch is automatically activated: the liquid is then in contact with the sample.

When the audible tone marks the end of the preset test period, the container must be immediately rotated back into its starting position. The container is opened and the sample placed onto the pressing plate. The excessive liquid that is still held by the sample is pressed out of the sample by means of the pressing roller. Immediately the weight of the sample is measured again.

The amount of liquid absorbed by the sample is determined by weighing the sample before and after wetting. The amount of water applied to the sample in an area of one square meter is calculated. This is the absorbency measurement.
The volume is indicated in g/m2. The tests are to be carried out at the same standard climatic conditions, at which the preparation of the samples was carried out.

Technical data

Weight: 5.5 kg Inner diameter of the cylinder: 112.8 mm Cylinder height: 44.0 mm Max. sample thickness: ≤4.0 mm


Model Test Material Substrate Thickness
SFT 03t  Paper & Cardboard Max. 4mm
SFT03t wp8 As SFT 03t + corrugated board Max. 22mm

Consumables: Standard Pulp Blotters

For more information, please contact our Sales Team on 01223 492081 or via sales@tendringpacific.com