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Industry Standards

TAPPI T 839

Introducing TAPPI T 839 - Industrial Physics  

TAPPI T 839 is a TAPPI international testing method to determine the edge compression strength of corrugated fiberboard using the clamp method. 

This TAPPI edge compression test method (ECT) describes procedures to determine the edgewise compressive strength, parallel to the flutes, of a short column of single, double, or triple-wall corrugated fiberboard. The TAPPI T 839 approach offers options for testing with constant strain rate or constant load rates.  

The ECT method requires a precise compression test machine with force capacity no less than 500 lbs.  

The TAPPI T 839 edge compression strength testing process

The TAPPI T 839 edge compression test method includes directions for: 

  • Cutting the test specimen (saw cutting and knife cutting) 
  • Preparing your corrugated fiberboard specimen (spring support clamp fixture) 
  • A procedure for applying the ECT method, compressive force (constant strain rate, or constant load rate) 

This edgewise compression test accomplishes the same crush force measurement as TAPPI T 838. 

What is an edge compression strength? 

An edgewise compressive strength test - known as an edge compression test - will help you to determine the cross-direction force you’ll need to crush a sample of corrugated board until it fails. It’s a good test for the lighter weight corrugated cardboards of the modern age, which include recycled composites that weigh less but can withstand more pressure than their traditional counterparts. 

The edgewise compressive strength test is one of the most important quality control checks for corrugated box makers and users. That’s because it’s used to determine the dynamic compression strength of containers made from that board.  

Why is compression strength testing important?

Fiberboard shipping containers can be subjected to loads while in normal use, which are resisted by their edgewise compression strength. If you can get to grips with this essential performance characteristic then you’ll enjoy increased control over the manufacturing process and your ability to measure the quality of the finished product.  

TAPPI T 839 edgewise compressive strength testing devices

So, how can Industrial Physics improve your TAPPI T 839 edge compression strength testing? 

Messmer Buchel Crush Tester 17-56 

The Crush Tester 17-56 is suitable for a wide variety of samples, including corrugated board, tubes, corrugated paper and plastics. It’s a robust, easy-to-use instrument with a precision load cell, making it highly accurate - even at low force values. 

Need TAPPI T 839 testing solutions? Get in touch

We’ve been designing and building edgewise compressive strength testing devices for many years and we’ve learnt a thing or two about paper testing best practice along the way.  

We like to share this expertise across the knowledgebase section of our website where you’ll find blogs like this one - what is edge crush testing? – ECT FAQs? Also, be sure to check out our handy conversion chart for edge crush testing here.  

If you have any further questions then don’t hesitate to get in touch!  

Contact us - Industrial Physics 

Your global test and inspection partner for TAPPI T 839