Weld & Closure Strength Testing of VELCRO® Brand Straps

To ensure our straps meet the high standards our customers expect from VELCRO® Brand products, we commissioned independent strength testing through BTTG/Shirley a UKAS-accredited laboratory specialising in textile performance testing.

We submitted two strap types for evaluation:

• 25mm wide hook and loop straps
• 50mm wide hook and loop straps

Each type was tested in two configurations to simulate real-world use:

1. Weld Strength (Single Thickness Test)

This test measures the strength of the welded connection where the hook tape is bonded to the strap. The strap was tested as a flat, single layer to isolate the weld.

• 25mm strap: average break strength of 284 Newtons
• 50mm strap: average break strength of 639 Newtons

In every sample, failure occurred at the weld which is expected in this type of test and confirms that the strap breaks at the join, not the tape itself.

2. Weld and Closure Strength (Closed Loop Test)

In this configuration, the strap was looped through the buckle and closed as it would be in use. This test measures the combined strength of the buckle, closure, and weld area.

• 25mm strap: average break strength of 727 Newtons
• 50mm strap: average break strength of 1691 Newtons

Most failures again occurred at the weld, though in some cases (noted in the report), the plastic buckle broke before the weld gave way indicating the overall strength was greater than the buckle’s capacity.

Why We Test

We use genuine VELCRO® Brand tape in all our strap manufacturing. But strength and durability depend not just on the tape itself, but also on how it’s assembled. That’s why we submitted our finished straps for full mechanical testing.

By testing both the welds and the completed strap under realistic tension, we can confidently publish break strength figures you can rely on. Whether you're securing items in transport, bundling cables, or using them in commercial or industrial applications you’ll know what your strap can handle.

Where to See the Results

We’ve published the average tested break strengths for each strap size and type on their respective product pages. That way, you can make informed decisions based on real-world performance.

Explore our full range of VELCRO® Brand Ring Straps, including made-to-order sizes manufactured in-house.