A family of amorphous thermoplastics that is similar to PEEK. It costs less but has a lower operating temperature range than PEEK. It is easily machined, has good chemical and flame resistance, can survive steam sterilization, is biocompatible, and is approved for food contact.
A family of PEI materials is also known under the trade name of ULTEM. Several ULTEM materials used in industrial FDM systems are approved for use in aerospace applications.
In additive manufacturing, both PEI is used as a build material for high-strength and high-temperature applications in fused deposition modeling systems. Other polymers adhere well to PEI, so PEI sheets are used in many fused deposition modeling systems as a build surface. ULTEM powder is also available in powder bed fusion systems.
Abbreviated as PEI.
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