Selecting the best elastomer for an application requires a thorough understanding of the application and performance requirements.

Choosing the right material can be a daunting task. However, the first step is to pre-determine the conditions to which the end product will be exposed. Some of these include:

• Temperature and other environmental factors
• Physical, mechanical and chemical resistance requirements
• Industry standards requirements such as UL, ASTM, SAE, FDA, NSF and U.S. Military Standards

The right compound

The initial compound is essential to the entire design process. A small change to the accelerators or age resistors, and the finished compound meets or misses standard industry requirements.

Most rubber polymers have limited commercial value in their original state. Therefore, a compound “recipe” must be developed to enhance or add to a polymer’s inherent physical and chemical characteristics and to ensure efficient molding or extruding. In creating the proper recipe, a compounder needs to be aware of a number of chemical or technological factors:

• The customer’s technical specifications
• Individual polymer properties
• Additives that can alter price, processing and vulcanizing/curing systems
• Anti-degradants
• Mixing procedures
• Testing/quality assurance methods