Client Login

forgot password

Vartest in Action: Dynamic Seam Fatigue Testing

Dynamic Seam Fatigue (ASTM D4033) assesses the ability of a fabric to be sewn effectively for use on upholstery fabric. The cyclic impact of a weighted wheel over a fabric-covered foam block simulates repetitive stress onto a seat cushion. Just think: how many times this week have you crashed onto your couch after a long work day?

Similar to assessing a portion of your most comfortable reclining chair, a diner booth, or newly upholstered car seat, Dynamic Seam Fatigue testing measures resistance to yarn slippage.  This method is used across a variety of markets—contract & residential upholstery, home, hospitality, and automotive textiles to name a few.

How it works:

The Dynamic Seam Fatigue tester plunges a rubber-faced wheel 7,000 times onto a standard 7-SPI (stitch per inch) upholstery seam. Specimens are sewn in the warp to warp, filling to filling, and warp to filling direction. If after 7,000 cycles, the seams demonstrate no failure, the fabric is determined to have passed the criteria established by ASTM (American Society of Testing and Materials) and BIFMA (Business and Institutional Furniture Manufacturers Association). ASTM D4033-92 is used, modified by BIFMA X 5.4-2012 Seating Durability Test as the standard test method.

See the machine in action below!

How we can help:

Along with the fabric ratings, Vartest provides photographs of any failing specimens so that the Dynamic Fatigue test report can provide effective communication with the supply chain.

  • Your email is never shared.
    Required fields are marked *