Cobb Water Absorption Tester for Paperboard

Determines the mass of water absorbed by one side of paperboard in a fixed contact time using a metal ring and roller assembly. Used to check sizing and barrier coating performance of carton board.

Specification

A 100 cm2 ring is clamped over the weighed board specimen, filled with water for the specified time, drained and blotted with a standard roller before reweighing. The Cobb value in g/m2 shows how well the board is sized or coated against moisture and liquid penetration. It is a routine test for milk, juice and frozen food cartons.

Features

• Stainless steel ring with 100 cm2 area and quick clamp plate
• Standard 10 kg blotting roller with handle
• Built-in sample support base with rubber seal
• Calibrated cylinder for 100 ml fill
• Resistant to corrosion for daily lab use

Technical Specifications

Test Area	100 +/- 0.2 cm2
Water Volume	100 ml
Contact Time	30 s to 30 min (as per grade)
Roller Mass	10 kg, width 200 mm
Ring Material	Stainless steel 304
Standards	ISO 535, TAPPI T441, IS 1060
Base Plate	Stainless steel, 250 x 250 mm
Balance Required	0.001 g resolution (not included)

Standard Accessories

• Blotting paper pack
• Measuring cylinder 100 ml
• Stop timer