Polyetherimide is an amorphous engineering polymer capable of extreme temperature use. Despite PEI having such a high upper use temperature and very high required process temperatures (650° F+), PEI is relatively easy to process thanks to its very broad processing window of 650° F up to nearly 800° F. Polyetherimide provides outstanding electrical properties with stability over a wide variance of frequencies and temperatures. PEI is inherently flame retardant, and is also a low smoke generating polymer. PEI carries a UL 94 V-0 listing at 1/16″ thickness. Polyetherimide is even chemically resistant to aliphatic hydrocarbons, acids, and dilute bases. Polyetherimide’s high temperature capability allows for application uses many traditional polymers cannot handle and yet can be processed on most conventional thermoplastic processing equipment.
PEI can be blended with glass fibers, flame retardants and a wide variety of colorants to yield a mechanically and thermally superior product in a wide variety of standard and custom colors. PEI also has the ability to be transparent, as Polyetherimide in its natural color is a vibrant gold/orange transparent material. Thorough drying of PEI is required to avoid splay during processing.
Additives, Modifiers, and Reinforcing Agents:
Additives- UV stability, easy release (mold releases), colorants, and other stability additives
Modifiers- Flame retardants, impact modifiers, flow enhancers
Reinforcing Agents- Glass fibers, mineral fillers