Udel® polysulfone (PSU) is a high-heat, transparent engineering thermoplastic valued for its dimensional stability, toughness, and resistance to aqueous media. Yet “chemically resistant” never means “resistant to everything.” Compatibility depends on chemical family, concentration, temperature, and—often overlooked—stress state in the molded part. This quick guide summarizes how Udel PSU typically behaves and how to validate your application before you cut steel.

Polyethylene (PE) is deceptively simple—just long chains of –CH₂– units—but how long those chains are, and how broadly their lengths are distributed, drives everything from melt behavior to toughness and stress-crack resistance. Understanding molecular weight (MW) and molecular weight distribution (MWD) helps you select the right PE—LDPE, LLDPE, HDPE, or UHMWPE—for your part and process.