Issue #44  •  Fall 2016

 

The Newsletter of the

Web Sling & Tie Down Association

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WSTDA Selects New Material for Warning Labels to Provide Durability and Resistance to Common Petrochemicals

Seeking the most durable and chemical-resistant material for its copyrighted Warning Labels, WSTDA has sourced, tested and selected a new material to provide durable and dependable performance in a variety of in-field conditions.

The new label material is known as DPN Nylon and is described as smooth, thick-dip coated on both sides, nylon taffeta having a thickness of 0.01 mm. This material was tested for strength, tear resistance after cutting and resistance to petrochemicals.

The testing was performed on fabricated samples including the following:

  1. nylon 4” sling webbing with the DPN nylon label sewn under the sling capacity tag on one edge

  2. polyester 1” sling webbing with the DPN nylon label, folded in half, and sewn under the sling capacity tag on one edge

  3. polyester 1” sling webbing with the DPN nylon label, folded in to center each side, and sewn under the sling capacity tag on one edge

  4. polyester 2” tie down webbing with the DPN nylon label sewn under the sewing pattern on one edge, as in the adjustable webbing end of a ratchet strap assembly

  5. polyester 2” tie down webbing with DPN nylon label sewn under the seam on one edge, as in the fixed end of a ratchet strap

The purpose of fabricating the above samples was to then attempt to pull out, by force, the warning labels that were affixed to the specific representative samples. The results showed that a user would be unable to detach, break free or cause damage in any way to the labels by applying full strength in the attempt. The DPN nylon material’s physical properties are at least as good as the previous coated polyester label material for these applications.

The DPN nylon label material will cut with scissors somewhat as easy as the coated polyester material. However, the tear resistance following that cut is at least as good as the coated polyester material. Further, a tear without an initial cut is nearly impossible with the DPN nylon label material.

To test for resistance to petrochemicals, the DPN nylon material samples were subjected for 48-50 hours to gasoline, WD-40ฎ Multi-Use Product, motor oil, and utility oil. Following that saturation time, attempts to rigorously rub off or smear the printing from each of the labels resulted in no signs of any degradation whatsoever to the printing or to the DPN nylon label material.

WSTDA Warning Labels are copyrighted material and may only be purchased from WSTDA or by special license to members in good standing for printing and application to the product outside of the USA. The warning labels are available for web sings, roundslings and tie downs, each in English, Spanish and French-language versions. WSTDA Members receive discounts on their label purchases. For more information visit the Products/Standards page on www.wstda.com

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ฉ 2016 Web Sling & Tie Down Association

9 Newport Dr., Suite 200 • Forest Hill, MD 21050 • phone: 443-640-1070 • fax: 443-640-1031 • wstda@stringfellowgroup.net • www.wstda.com