Selecting strapping material? Here are a few terms you may encounter when comparing different types of strapping.
Break Load/Break Strength
Also called tensile strength, this is the force required to break the strap (generally expressed in pounds in the U.S.). The break load or break strength needed depends on the overall weight and size of the load, the number of straps that will be used, and the forces that the load will be subjected to during transit.
The maximum amount that a strap can be stretched; if the strap is stretched beyond its elastic limit, it will not be able to recover.
How much the strap will stretch when placed under tension; straps with greater elongation potential are able to stretch further. Greater elongation potential can be helpful when securing loads that are irregular or unstable.
Elongation Recovery (Shock Resistance)
How well the strap is able to recover after being stretched. Good elongation recovery will help the strap respond to load shrinking, settling or shocks while retaining effective tension.
The strength of the joint (e.g., seals, buckles, or heat/friction welds) expressed as a percentage of the total break strength of the strap. A joint with 75% joint efficiency will have a break load that is 75% of the break load of the strap it is securing. The total strength of the strap is only as high as the break strength of the joint securing it.
The amount of tension that the strap is able to maintain over time. Strapping with high retained tension will keep consistent tension over extended time periods to provide ongoing stability to the load.
Stress Relaxation (Creep)
How much the strapping will relax when under constant strain. Stress relaxation will cause the straps to lose tension over time as it stretches to accommodate the stress.
The strap's ability to withstand lateral tears.
The range of applied tension where the strap will perform at its best. In the working range, tension has been applied to the point where elongation has occurred but not to the point where the strap can no longer recover (elastic limit). The working range will vary for different strapping materials.
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