Cobb Sizing Tester

The Cobb Tester, or Cobb Sizing Tester, measures the water absorption capacity of paper, indicating its moisture retention ability. This device uses a metal ring to hold the paper sample, which is then submerged in water for a specific duration. After the test, excess water is removed, and the wet paper is weighed to determine the Cobb value. This value reflects the paper’s quality and its resistance to moisture, ensuring it meets application requirements and can withstand varying moisture conditions.

Defend Your Products from Corrosion

Advanced Corrosion Salt Spray Chamber for rigorous testing, ensuring durability in harsh environments

Procedure Cobb Sizing Tester

Effective Lab India manufactures the best Cobb tester according to industrial standards. The standard operating procedure of Effective Lab India according to the ISO standards is mentioned below.

  • Pick up the sample of the corrugated box and weigh it to 0.1 grams.
  • Place the cork sheet on a metal plate and after it place the specimen and clamp it firmly. The clamping is for preventing any kind of leakage between the ring and the sample.
  • If you would like to ensure leak-free clamping then use a soft gasket of the same dimension as the ring.
  • Now, put water into the fixture according to the sample requirement.
  • Hold the sample for some time. (120 seconds for paper and 300 seconds for a corrugated box).
  • If any sample shows the sign of leakage. Reject it.
  • If the sheet to the rubber mat goes through any liquid, then the test will not be acceptable.
  • After completion, the buzzer starts buzzing. If it’s going then pick up the sample from the tester.
  • Drain out the excess water from the sample with the help of a hand roller.
  • After that, weigh the sample again and your test is completed.

Formula of Cobb Test

For calculating the Cobb value use this formula.

Cobb value= Weight of the sample after testing – Weight of the sample before testing.

You can easily test the Cobb value of paper by following the above standards of Effective Lab India’s Cobb tester.

  • Sample Diameter: 130 mm (approx)
  • Weight of roller: 10Kg (approx.)
  • Diameter of rubber pad: 145 mm
  • Water level indicator in cylinder: 10 mm and 25 mm
  • Depth of cylinder: 60 mm
  • High: Grade stainless steel test area
  • Single handed High-Quality hassle free operation
  • Fast Locking Mechanism
  • Highly accurate test results
  • Lightweight and resilient
  • Rugged structure with corrosion resistant main body
  •  

Know About Our Products

The Cobb Sizing Tester offers precise, multi-environment testing by combining salt spray with humidity, drying, and condensation cycles. It rigorously simulates harsh conditions to assess material durability, ensuring your products withstand corrosion and deliver long-lasting performance in challenging environments.

What is a Cobb tester?

It is a testing instrument for determining the water absorptivity of paper or corrugated cardboard.

How do you test Cobb’s value?

Cobb value is tested by using the formula.

Weight of sample before testing – the weight of the sample after testing

What is the ISO standard for the Cobb test?

The ISO standard for the Cobb test is 535.

Why is Cobb’s value important?

The Cobb value is important for measuring the absorption of water or any other liquid on paper or corrugated boxes.

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