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Industry Standards


Introducing TAPPI T 479 - Industrial Physics

TAPPI T 479 is a TAPPI international testing standard that’s used to test the smoothness of paper using the Bekk method of smoothness testing.  

The Bekk Method is a tried-and-tested surface roughness testing approach based around air flow. It involves drawing air across the surface of a test piece under a partial vacuum. 

Bekk smoothness depends on the form, total volume and distribution of pores created between the paper surface and the ideal plane under the specified contact conditions. The higher the Bekk smoothness number, the greater the smoothness. The porosity of the tested product is also included in the measurement.  

The TAPPI T 479 smoothness testing approach 

This TAPPI standard can be used to determine the smoothness of a wide range of papers. To carry out a TAPPI T 479 test you’ll determine the smoothness of individual surfaces of paper when under a clamping pressure of approximately 100 kN/m2 and using an anvil with an effective area of 10.00 ± 0.05 cm2. 

TAPPI T 479 Bekk smoothness testing devices

So, how can Industrial Physics improve your TAPPI T 479 Bekk smoothness testing? 

Messmer Büchel – Bekk Smoothness Tester 58-05
The Automatic Bekk Smoothness Tester is a microprocessor-controlled instrument for testing the smoothness of paper and board according to the Bekk Method. The Bekk smoothness tester determines the smoothness of the sample in seconds.  

Our smoothness tester is especially suitable for very smooth surfaces such as coated label papers or coated free sheets. 

Need TAPPI T 479 testing solutions? Get in touch 

We exist to smoothen up the rough edges of our customers’ testing approaches. We’ve learnt a few things over the years; these days Industrial Physics is recognized as a brand that likes to bring the smoothest of smoothness testers to market. 

We share our knowledge openly and we’re here to help you to answer your questions about smoothness testing. Across the knowledgebase section of our website we publish lots of blogs on related subjects.   

Firstly, please check out this piece which compares two variables of common roughness / smoothness testers. Then follow up with an article on porosity testing – the Gurley, Sheffield and Bendtsen methods. 

If you have any questions about TAPPI T 479 and how we can help you with your smoothness testing, then please just get in touch!

Contact us - Industrial Physics 

Your global test and inspection partner for TAPPI T 479