This is partly crystalline thermoplastic, obtained by homopolymerization of formaldehyde POM-H or POM -R copolymerization. Copolymers, in contrast to homopolymers are alkali-resistant and highly resistant to water. POM which is not be strengthened belongs to stiffest and strongest thermoplastics and it has very good dimensional stability.

Stiffens below -40°C and can be used for short periods up to 150°C and long-term to +110°C.