 Ultem 1000 (standard, unfilled polyetherimide) has a high dielectric strength, inherent flame resistance, and extremely low smoke generation.Ultem has high mechanical properties and performs in continuous use to 340 °F (170 °C) and is easily machined and fabricated with excellent strength and rigidity.Ultem 1000 has typical thermal conductivity of 0.22W/m·K (but some sources give 0.122W/m·K).