5J11 Thermostatic Bimetal (Thermal Bimetal Strip)

5J11 is a Chinese thermostatic bimetal material consisting of a high-expansion layer of Mn75Ni15Cu10 bonded to a low-expansion layer of Ni36 (Invar 36). When the temperature changes, the two layers expand at different rates and the strip deflects, converting temperature change into mechanical movement — the working principle of temperature relays, thermal protection switches and simple temperature-control devices.

Overview

• Category: Thermostatic bimetal (thermal bimetal) material
• Construction: high-expansion layer Mn75Ni15Cu10 + low-expansion layer Ni36
• Appearance: metallic luster, supplied as strip or sheet
• Available forms: strip, sheet; processed into shaped elements by stamping, bending and cutting

Physical & Thermal Properties

Mechanical Properties

Electrical Properties

Key Features

• Medium thermal sensitivity — produces reliable bending deflection with temperature change for temperature sensing and control;
• Good low-temperature stability, maintaining consistent performance over a wide temperature range;
• Adequate strength and good elasticity for easy fabrication and service.

Fabrication

• Composite sheet is produced by cold-rolled bonding, hot-rolled bonding or molten bonding of the two layers;
• Shaped elements can be made by stamping, bending and cutting.

Typical Applications

• Ordinary temperature relays — temperature control and circuit make / break;
• Thermal protection switches — protecting electrical appliances against overload or overheating;
• Simple temperature-adjusting devices, such as temperature-control components of small heating equipment.

For detailed datasheets, mill certificates or inquiries on specific sizes and tolerances, please contact our sales & engineering team.