High elongation is great for Slinky’s, but its not good for woven and composite cord strapping. Too much elongation causes sway and can prevent buckles from staying closed and loads from staying tight. And when straps stretch too much their ability to resist impacts is reduced. So high elongation strapping can be very dangerous where high impact resistant, low elongation strapping like Redback is required.
ASTM International and The Association of American Railroads require woven and composite strapping to have between 9-15% MAXIMUM elongation at break. Redback Low Elongation Woven Strapping is typically between 12-13% and Redback Low Elongation Composite Strapping is typically between 10-11%.
And Redback Strapping has high modulus of elasticity. So as it is stretched it fights back exponentially like an industrial shock absorber to return to its original shape. By contrast a lot of woven and composite strapping on the market can have 50-100% more elongation than Redback.
Here is a comparison of Redback AAR Grade 4 composite strapping and the Grade 4 composite strapping from the leading U.S. manufacturer. As you can see, the competitor’s strap had 23.5% elongation compared to Redback at 11%. That’s more than twice the elongation and clearly does not meet ASTM International or AAR requirements.
If you would like to secure your loads with dependable, high impact resistant, low elongation strapping give us a call and request Redback!