General Characteristics of Amorphous High Performance Materials High service temperatures High strength Hot water and steam resistance Thermoformability Amorphous high performance materials can be considered for applications with an approximate maximum temperature of 350°F. Selecting a plastic material for use in a high temperature environment requires careful review of material properties data. View our interactive Thermoplastics Triangle to compare materials. Explore Amorphous High Performance Materials PSU High temperature, semi-transparent plastic material with good mechanical properties. PPSU High temperature thermoplastic material with outstanding impact resistance that is autoclavable. Ultem® High strength plastic with outstanding electrical and high service temperature properties.