Duplex-insulated thermocouple wires insulated and sheathed with fluorocarbon-resin FEP. FEP is an ideal insulation material with various excellent properties such as electrical properties, heat-resistance, cold-resistance, oil-resistance, chemical-resistance, etc. This series can be used in a wide range of temperatures from -250℃ to +200℃.

Duplex-insulated thermocouple wires insulated and sheathed with super-heat resistant ceramic fiber. This series has excellent heat-resistance, electrical insulation resistance, and flexibility. 
The strength of the wire does not weakened so much up to maximum operating temperature of thermocouple elemental wire (under normal condition).

Duplex-insulated thermocouple wires insulated and sheathed with silica-glass fiber.

Maximum operating temperature under normal condition is 400℃, and short-time maximum operating temperature under overheating condition is 600℃ (500℃ when diameter of conductor is 0.32 mm).

Duplex-insulated thermocouple wires insulated and sheathed with glass fiber, and coated with heat-resistant inorganic coating to improve heat-resistance and insulation properties. Maximum operating temperature under normal condition is 350℃, and short-time maximum operating temperature under overheating condition is 400℃.

Duplex-insulated thermocouple wires insulated and sheathed with glass fiber. Glass is one of the most common heat-resistant insulation materials which can be used under temperature up to 250℃. However it is not suitable for use in dump environments because of its low insulation resistance.

Duplex insulated thermocouple wires insulated and sheathed with heat-resistant PVC.
PVC is one of the most common insulation materials which can be used under temperature up to 90℃, and with excellent electrical & mechanical properties and water-resistance.