Some materials perform well in chemical or high heat applications where others may deteriorate under harsh operating conditions. Even the specific type of oils or chemicals being used in your application determine seal ring material compatibility. Abrasion and tear resistance may also be of importance, especially in dynamic applications or when abrasive substances are involved.
Primary considerations for seal ring material selection include chemical compatibility, application temperature compatibility, sealing pressure, durometer, size, and cost. Depending on the application, factors such as electrical properties, dynamic resistance, tear-resistance, and ozone resistance should also be considered. Taking all these parameters into consideration will help you determine which seal ring material choice is best suited for your application.
Fluoroelastomer: Often used in applications where heat is a problem, fluoroelastomer seal rings are heat-resistant, durable and long-lasting.
Silicone rubber: Featuring a soft, spongy design, silicone rubber seal rings are used in the foodservice industry because they are safe and nontoxic.
Ethylene propylene diene monomer: While not suitable for use with lubricants or fuels, ethylene propylene diene monomer seal rings offer strong resistant to moisture, steam, silicone, and grease.
Thermoplastic polyurethane: Offering a high level of tensile strength, thermoplastic polyurethane seal rings are resistant to degradation.