Our rubber testing whitepaper “Fenders: why it’s not so black and white” highlights some interesting results from the comparison of the compositions of low cost and high quality fenders – results that clearly highlight dramatically different performance characteristics between the two.
The low cost fenders contained larger amounts of recycled rubber and filler, and were found to be heavier and denser than those that used virgin rubber.
Further chemical and physical analysis revealed some further important results, including:
- Tensile strength and the value of elongation at break were found to be lower in the low cost fender than in the high quality fender, which was made with higher quantities of virgin rubber.
Crucially, the low cost fender was not in compliance with the specification.
- Rubber to filler ratio for the high quality fender was 1.23, for the low cost fender, just 0.88.
- Overall, the low cost fender contained 28.45% less rubber than the high quality product, explaining the difference in the physical properties of the two and justifying the higher purchase price of the high quality fender.
It’s essential that decision makers are aware of the key performance differences and varying quality being sold as one and the same thing, when they procure fenders based on up front price alone.
These tests provide a reliable analytical method that can be made available to buyers so that they can assess the composition of recently procured fenders prior to delivery, simply by taking a small sample from the surface of the fender.
For more information, download the full rubber testing white paper here.