What is the difference between Urethane and Rubber Bumper Plates?
Apart from the aesthetics differences and texture, Urethane Plates are able to withstand a higher degree of stress and are more resistant to fatigue and tearing over time. It also has less flex than rubber so they resist flexing when dropped. They also have a high durometer rating so they will provide less bounce than traditional rubber bumpers.
As with all our bumper plates they are manufactured to IWF standards with a 450mm diameter and centre collar opening of 50.4mm.
- Plate Diameter: 450mm per IPF specifications
- Plate Width: 40mm
- IWF Standard collar Opening of 50.40mm or 1.98 inches to ensure a perfect fit on all regular Olympic barbells. This also prevents damage caused by loose or incorrectly sized collar openings.
- Zinc plated centre hub
- Low odour virgin rubber
- Shore Durometer Rating of 90
Sizes available are 5 kg, 10 kg, 15 kg, 20 kg & 25 kg.
- 5 kg: 22mm
- 10 kg: 40 mm
- 15 kg: 40 mm
- 20 kg: 53 mm
- 25 kg: 65 mm
Why are Bumper Plates rated using the Shore Durometer Scale?
The Shore Durometer Test is the standard international system that is used to test the hardness of rubber and other synthetic compounds. The Durometer Scale was developed in the 1920s by Albert F. Shore, who created a device to measure these types of materials and so it has been named after him.
Material hardness is rated and defined according to its resistance to permanent indentation or total failure. Examples of "total failure" would be if the bumper plates were to warp or buckle during use or the inserts detaching.
The word "Durometer" has two specific meanings; The name of the instrument used to conduct these tests and the rating achieved based on the Shore Durometer Scale.
This device works by providing a rating of 0 to 100. To give you a perspective on this, most car tyres are rated at approximately 65, which is fairly high as they need to withstand a lot of punishment. A bumper plate with a reading of over 65 is considered more than acceptable.
Our Premium Series Bumper Plates returned a reading of 92! They are without doubt at the very top end in quality but due to our Industry Direct Wholesale Buying program you can buy them at up to half what it would cost you for similar grade bumpers from other suppliers. They will provide greater performance during repetitive use and last far longer than lesser quality bumpers.