Product Introduction

1. Introduction

Cobb Water Absorption Tester is used to test the water absorption performance of paper and cardboard surface, that is, the water resistance of paper and cardboard. A test piece is weighed immediately before and immediately after exposure of one surface to the water for a specified time, followed by blotting. The result of the increase in mass is expressed in grams per square meter (g / m²). The standard model has a test area of 100cm². 

2. Standards

ISO 535, GB 1540, QB 1668

3. Test Principle 

100 ml ± 5 ml of water, or proportionately less for a smaller test area, are poured into the cylinder, thus providing a head of 10 mm. The sample is placed on top and the lid is closed. As the cylinder is turned over, use a stopwatch to start timing. The exposure time is selected according to the degree of water absorption of the paper and board. If, for example, a test time of 60 s has been selected, the cylinder is turned back after 50 s. The sample is quickly unclamped and placed (test face up) on a sheet of dry blotting paper on the couching table. 60 s after commencement of the test a second sheet of blotting paper is placed on top of the test piece and the excess water removed by push the pressure roller out and then pull it back.

4. Features

Rotate the top handle 90° to quickly hold the lid of the container
Stainless steel container
Fast and easy testing proces
Clamping style good sealing

5.Specifications

6. Standard Accessories

A measuring cup, a box of absorbent paper

7. Optional Accessories

Absorbent paper