High Sensitivity Precision Alloy Thermal Bimetallic Strips TB20110/721-110/108SP/P675R/BR-1 convert temperature changes into mechanical displacement through differential thermal expansion of bonded metal layers.

• Density: 8.1 g/cm³
• Allowable Temperature Range: -70°C to 350°C
• Linear Temperature Range: -20°C to 180°C
• Electrical Resistivity: 0.8 ±5% μΩ·m (20°C)
• Thermal Conductivity: 12 W/m·°C
• Bending Coefficient: 15 × 10⁻⁶ °C⁻¹ (20-135°C)
• Elastic Modulus: 147-177 GPa

This thermal bimetallic strip material is primarily used in automatic control devices and instrumentation including:

• Exhaust thermometers and thermostats
• Voltage regulators and temperature relays
• Automatic protection switching systems
• Diaphragm meters and temperature indicators
• Various heat-sensitive components for temperature control and compensation

The thermal bimetallic strip consists of two or more layers of different metals firmly bonded along their entire contact surface. The metal with higher thermal expansion coefficient (active layer) expands more when heated, causing the strip to bend toward the lower expansion coefficient metal (passive layer). This mechanical displacement enables conversion of thermal energy into mechanical work for automatic control applications.