First off, let’s explain what polymer content is and its significance. Polymer content in EPDM refers to the percentage of polymer material, specifically ethylene, propylene, and a diene monomer, in the EPDM rubber composition. EPDM, or Ethylene Propylene Diene Monomer, is a type of synthetic rubber known for its durability, resistance to weather elements, and flexibility. The polymer content in EPDM rubber is crucial as it directly affects the rubber’s physical properties and performance.

But is there a big difference in quality among the suppliers of EPDM that advertise 20% vs 24% polymer content? No, but for some suppliers, it becomes a unique selling point to advertise a higher polymer content. Generally speaking, a higher polymer content means better retention of mechanical properties over time. Although some suppliers boast polymer contents over 24%, the industry standard hovers around 20% ± 2%.

The question then becomes: What’s the difference between 20% and 24% polymer content? The answer is not much, especially considering the significant price increase for the latter (more than a 25% price increase). Let’s illustrate a very common scenario, residential pool decks. Most pools throughout the US are probably going to be used from May to August. And most of the usage will be homeowners, their families, friends and a relatively small group of people. So from our experience a pool deck with 20% polymer content, will suffice for many years, making the additional cost for higher polymer content unnecessary for most homeowners. It will feel the same, function just as well, and will outlast the resin that binds it together. So all in all, a higher EPDM polymer content is not what you worry about.

Even in commercial settings where usage is potentially much higher, a price premium multiplied by a large square footage equates to several thousands of dollars extra for marginal benefit and very limited justification of funds. The economics of it simply do not add up. The truth is, even if the flooring shows signs of wear, EPDM is easily repaired and replaced.

The one factor that we do not recommend skimping on that does make a larger impact is the polyurethane resin.