This product is a Glass Encapsulated (GE) DO-35 package. The leads are metallurgical bonded to the thermistor element for improved reliability. The operating temperature of this package is typically -58°F to +400°F or (-50°C to +204°C). This glass encapsulated series has a time constant of 7 seconds and has a standard resistance tolerance of +/- 10% at 77°F (25°C).