Full definition
ECO rubber, a copolymer of epichlorohydrin and ethylene oxide, is a specialized elastomer that provides a remarkable balance of properties suitable for various demanding applications. This material is particularly known for its excellent resistance to fuels and oils, making it a preferred choice in the automotive and industrial sectors. Its temperature range allows for operation in environments from -40°C to +135°C, ensuring reliability in both cold and hot conditions. The low gas permeability of ECO rubber, which is 3-10 times lower than that of nitrile rubber (NBR), enhances its performance in applications such as fuel system diaphragms and bladders, where leakage can lead to significant issues. The three main subtypes of epichlorohydrin rubber include CO, which offers the best oil and fuel resistance as a homopolymer, ECO itself for its superior low-temperature flexibility, and GECO, a terpolymer designed for peroxide curing processes.
In terms of chemical resistance, ECO rubber performs well against mineral oils, fuels, dilute acids, and ozone, although it exhibits poor resistance to ketones and esters. This makes it less suitable for environments where these chemicals are prevalent. According to ASTM D2000, ECO rubber falls under classifications CH and DE, indicating its suitability for various industrial applications. Its positioning in the market is strategic, being more affordable than FKM (fluoroelastomers) while offering better performance than NBR. This balance makes it an attractive option for manufacturers looking to optimize performance without incurring high material costs.
Applications of ECO rubber are diverse, particularly in the automotive industry, where it is utilized in fuel hoses, seals for fuel sender units, air intake boots, and various gaskets that require resistance to oil and fuel. In industrial settings, its properties lend themselves well to the production of gaskets and diaphragms that must withstand harsh conditions. The versatility and resilience of ECO rubber make it a valuable material for engineers and procurement managers seeking reliable solutions for fuel and oil resistance in their operations.