How thin is thin?

Ajedium Film Group LLC in Newark, Del., a start-up maker of specialty films using high-heat engineering resins, has made monolayer film of a ketone-based resin as thin as 0.00025 in. (1/4 mil), and three-layer film down to 0.003 in. of polycarbonate. Ajedium also makes films as thick as 0.050

The company started production late last year on a specialized Davis-Standard two-extruder line with a three-layer feed-block and die from Cloeren Inc. and special cooling/tempering rolls. The line is designed to handle resins with melt temperatures up to 800 F, like PEEK, PPS, and polyetherimide (GE's Ultem), as well as PVDF and polymethylpentene (PMP). Ajedium's customers include resin companies seeking to develop new film markets for specialty resins. PMP film, for example, can be thermoformed into speaker cones and PPS film has potential in high-temperature electrical insulation and capacitators.

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