How Cobb Tester is helpful in Measuring the Water Absorbency of Paper and Paperboard?

How Cobb Tester is helpful in Measuring the Water Absorbency of Paper and Paperboard?

Paperboard being one of the widely used materials will help you to deliver the products accurately to the customers. Performing the cobb test on these materials is essential to ensure accuracy in testing results. This test can be performed using one of the highest quality laboratories testing equipment known as Cobb tester. This is one of the quality testing equipment that can effectively determine the quantity of water being absorbed in a specific period of time by 1 sq. meter. of paper board and corrugated board under standardized conditions.

Recognizing the significance of this quality assessment Presto Stantest Pvt. Ltd. has developed a state-of-the-art laboratory testing instrument, the Cobb tester. This innovative laboratory testing instrument is tailored to accurately measure the water absorption capabilities of paperboards, empowering industries to make informed decisions regarding packaging materials and ensuring optimal performance in diverse environmental conditions. Here, we will discuss brief information about Cobb's value and how you can easily calculate it. 

Measure the Water Absorbency of Paper by Conducting the Cobb Test on Paper

The Cobb test evaluates the water absorption capacity of sized (non-absorbent) paper, paperboard, and corrugated fiberboard samples within a defined timeframe, typically 60 or 180 seconds (referred to as Cobb60 or Cobb180). The results are expressed in grams per square meter (g/m2), indicating the amount of water absorbed into the surface of the material.

This quality test assesses the liquid absorption rate of absorbent paper, paperboard, and paper products based on gravimetric principles. A predefined volume of liquid is applied to the paper surface, and the time taken for absorption is recorded. The rate of water absorbency serves as a criterion for evaluating the suitability of tissue, towelling, and blotting papers for absorbent tasks.

Additionally, alternative test liquids such as ink, oil, and milk are utilized to evaluate the relative performance of papers for specific applications. You can easily calculate the Cobb value of paper and boards and conduct Cobb tests on materials with the help of this quality testing equipment.

The primary objective of conducting the Cobb sizing test on paperboards and related materials is to ascertain their water absorption capacity within a specified timeframe. This evaluation aids in gauging the performance of these materials across various applications.

By performing Cobb sizing tests on the materials, manufacturers can easily ensure that their products are designed as per mandated quality benchmarks that will be fit for their intended application. 

This assessment furnishes crucial insights into the water absorbency characteristics of the material, empowering manufacturers to make informed decisions regarding material selection for specific applications. Ultimately, the Cobb sizing tester serves as a vital quality assurance tool, ensuring the integrity and functionality of paper and paperboard products. Presto Stantest Pvt. Ltd. is a leading Cobb tester manufacturer and if you want to buy a Cobb tester then you can give us a call at +919210903903 or email us at

How you can Easily Perform the Cobb Sizing test on Paper and Paperboard?

As we have discussed above packaging materials will not only help manufacturers in ensuring their durability but also ensure that the contents inside the packaging will remain constant. The Cobb value serves as a key metric in assessing a material's water absorption property, a critical factor in maintaining the quality of paper and corrugated fiberboards (CFBs).

The Cobb test entails measuring the amount of water absorbed within a specified timeframe by non-absorbent paper with a thickness of 0.1 mm. This evaluation helps ensure that the Cobb value remains within acceptable parameters, thereby upholding the integrity and performance of the paper and CFBs for packaging applications. 

The Cobb tester is built with a sturdy structure, featuring a corrosion-resistant main body that guarantees durability and reliability, even in challenging industrial settings. Despite its rugged build, the tester is lightweight and resilient, making it easy to transport and maneuver within testing facilities.  Its fast locking mechanism enables swift setup and adjustments, streamlining the testing process for maximum efficiency. Engineered for user convenience, the Cobb tester features a single-handed, high-quality operation, minimizing downtime and enhancing productivity. With these innovative features, the Cobb tester offers a hassle-free solution for precise and reliable water absorbency testing in various industries.

Now, let us discuss the steps to conduct the Cobb test on paper and determine the Cobb value.

Step 1: Prepare the sample by cutting it larger than the steel platform and weighing it accurately using appropriate testing instrument.

Step 2: after that, you can place a cork sheet on the platform to prevent slippage, then position the sample and clamp it securely.

Step 3: Add water to the fixture according to the sample size and start the stopwatch.

Step 4: Allow the sample to remain in the cylindrical ring for the specified time (120 seconds for paper, 300 seconds for corrugated boards).

Step 5: Discard the test if any leakage occurs.

Step 6: Drain the water and carefully remove the sample from the platform.

Step 7: Use the steel roller to remove excess water from the sample, rolling parallel to the flutes for corrugated boards.

Step 8: Weigh the sample after draining the excess water.

These are some of the useful steps that you can follow to perform a Cobb sizing test on the materials. If you want to buy a Cobb tester then you can consult with us. Presto Stantest Pvt. Ltd. Offers you the best Cobb tester price and helps you ensure that you will get accurate testing results. 


Packaging of materials plays an important role in the preservation and safety of products. Various products will get transported from one place to another which will require accurate testing. By performing quality tests on the materials, manufacturers can easily ensure the quality of the material being used. Presto Cobb sizing tester is one of the high-quality testing equipment that can test the water absorbency levels of the materials.

It is widely used testing equipment in the paper and packaging industry and designs this quality testing equipment at the best and most affordable prices. If you want to get a live testing session for this testing equipment then you can give us a call at +919210903903 or email us at


Author : -Gaurav Malhotra

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