How to Prepare a Sample for the Cobb Test in 3 Easy Steps?

Reviewed by Anurag Mishra (Sr. Technical Consultant)

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In the paper and packaging industry, the manufacturers take several lab tests to ensure the quality of the material. One of the most important tests is the Cobb test that will help to determine the amount of water to be absorbed by a sheet of paper or cardboard used to pack materials. This type of test will be conducted with the help of a Cobb sizing tester. Testronix Cobb sizing tester is one of the best testing equipment available in the market that will help you to determine the Cobb value of the specimen. Here in this blog, we are going to provide brief information about the Cobb sizing tester and how you can easily prepare the sample for the Cobb test.

What is Cobb's sizing tester and its purpose?

If the paper and its related products used in the packaging industry are less durable in terms of several parameters, then it will affect the quality of the product. Thus, you need to make sure that all parameters of the product should be tested in order to make error-free delivery. One of the most important parameters of paper-related products is their strength to absorb water. This will be determined with the help of the Cobb test done by using a Cobb sizing tester. By conducting the Cobb test, you will be able to test the ability of paper to resist water. It plays a significant role in the packaging industry. You can read about the significance of Cobb tester in the packaging industry.

If the paper and its related product have a fast rate of absorbing water, then your products are at stake of being destroyed. Therefore, with the use of a Testronix Cobb sizing tester, you will be able to improve your product quality by determining the amount of water absorbed by the paper, paper boards, etc.

A high COBB value indicates the ability of the substrate to easily absorb and retain moisture. A low COBB value indicates the ability of the substrate to resist penetration and retention of moisture. Depending upon the application of the paper/board, the COBB value has to be maintained. This Cobb test method covers the determination of the quantity of water absorbed in a specified time by no bibulous paper and paperboard with a minimum thickness of 0.1 mm.  

This lab testing equipment has been embedded with several amazing features. You can also read how this laboratory testing instrument leads the market with its astonishing features.

Features of Cobb sizing tester

By conducting the Cobb test, you will be able to do fast determination of water absorptiveness levels in a specific time. This testing instrument has been embedded with high-quality features that make it easy for you to find the Cobb value of the given specimen. Here we have created a list of features of the cobb sizing tester from Testronix.

  • Durable structure with the corrosion-resistant main body
  • The lightweight and resilient structure
  • Rapid Locking Mechanism
  • Single-handed easy operation
  • Highly accurate test results
  • Strong sample mounting
  • Rugged construction
  • Minimum maintenance requirements
  • Low wear and tear of parts
  • Standard weight roller provided along with the equipment.

Technical Specifications:

  • Placement of machine: Bench Model
  • Sample Diameter: 130 mm (approx.)
  • Depth of cylinder: 60 mm
  • Diameter of rubber pad: 145 mm
  • Water level indicator in the cylinder: 10 mm and 25 mm
  • Weight of roller: 10Kg (approximate)
  • Stainless steel /mild steel body

These are some advanced features and technical specifications of this lab testing equipment. The need for Cobb testers in the paper and packaging industry has been increased over the past few years. Thus, it will give you highly accurate testing results. Before you conduct the test, it is very important for you to prepare the sample accurately. Therefore, we have listed three easy-to-follow steps to conduct the Cobb test with the help of the Testronix Cobb sizing tester.

The easiest way to prepare a sample for Cobb test

To prepare the sample accurately with the help of this lab testing equipment, we have come up with three easy-to-follow steps. You can read them below.

  • First of all take a piece of Sample of a cardboard or paper board, which you need to test.
  • Now, cut the sample in a circular shape more than the diameter of the Rubber pad or fixture.
  • Now measure the weight of the circular sample using Digital Weighing Balance.

In this way, you can easily prepare the testing sample and start with its placement to conduct the test accurately. If you need any more assistance regarding price, working or anything related to our testing instruments, give us a call at +919313140140 or email us at We will surely guide you well regarding your product queries.

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