D-Type Fender Materials: EPDM vs. Natural Rubber – What’s the Difference?
When selecting D-type fenders for docks and vessels, material choice plays a critical role in performance and longevity. The two most common materials are Natural Rubber (NR) and Ethylene Propylene Diene Monomer (EPDM). Both offer unique advantages that make them suitable for different applications.
1. Natural Rubber
Natural Rubber (NR) is renowned for its exceptional elasticity and high energy absorption, making it ideal for heavy-duty, high-impact berthing scenarios. It offers superior tear resistance and can withstand repeated compression without permanent deformation. NR also benefits from strain-induced crystallization, which maintains structural integrity under extreme overloads. Over 70% of large ports and terminal fenders worldwide still use NR-based materials. One key advantage is its higher hardness – NR typically achieves higher Shore A hardness values than EPDM, providing greater rigidity for demanding applications.
2. EPDM
EPDM is a synthetic rubber with outstanding resistance to ozone, UV rays, and extreme weather conditions. It performs exceptionally well in tropical or high-sunlight ports where NR would degrade over time. EPDM also exhibits excellent seawater aging resistance, with slower property degradation under prolonged salt-spray exposure. It is important to note that EPDM products are heavier than NR products in actual applications due to the higher filler content required to achieve target mechanical properties. Additionally, EPDM is more expensive than natural rubber due to higher raw material and processing costs.
Understanding these differences – including the trade-offs in weight, cost, and hardness – helps ensure the right fender is selected for the right environment.
Nanjing Deers Industrial Co., Ltd
Tel:86-25-84507790
Fax:86-25 84660486
Whatsapp:+86 13376094258
Email: benny@chinarubberfender.com