Product Description
P675R Bimetallic Strip
Product Overview
P675R bimetallic strip is a high - performance composite material composed of two layers of metals with distinct coefficients of thermal expansion. The high - expansion layer is typically made of Mn 75 Ni 15 Cu 10, while the low - expansion layer is Ni 36. This unique combination enables the strip to bend or deform predictably in response to temperature changes, making it a fundamental component in a wide range of temperature - sensitive applications.
Standard Designations
- Material Standards: Conforms to DIN 17155 and ASTM B388 for bimetallic strip performance
- Industry Codes: Recognized as a Class A thermosensitive material under IEC 60730-2-9
- Alternative Designations: Equivalent to grades such as Thermalloy 675 and Bimet 75-36
Key Features
- High Deflection Sensitivity: 0.25mm deflection per 10°C at 100mm length (20-100°C range)
- Low Hysteresis: <2°C deviation between heating and cooling response
- Long-Term Stability: <1% deflection loss after 10,000 thermal cycles (-40 to 150°C)
- Electrical Conductivity: 8.5 S/m (enables use in current-carrying thermal switches)
- Corrosion Resistance: Passes 500-hour salt spray test (ASTM B117) with minimal oxidation
Technical Specifications
| Attribute |
Value |
| Total Thickness Range |
0.1mm - 2.5mm (tolerance: ±0.01mm) |
| Width Options |
3mm - 120mm (tolerance: ±0.05mm) |
| Layer Thickness Ratio (High:Low) |
1:1 (custom ratios 2:1, 3:1 available) |
| Operating Temperature Range |
-50°C to 180°C (continuous) |
| Maximum Short-Term Temperature |
200°C (≤10 minutes) |
| Tensile Strength |
480MPa (transverse direction) |
| Elastic Limit |
220MPa |
| Thermal Deflection Coefficient |
21.2 × 10⁻⁶ /°C (20-150°C) |
Material Composition
| Layer |
Main Elements (wt%) |
Trace Elements (max, wt%) |
| High-Expansion (Mn75Ni15Cu10) |
Mn:75, Ni:15, Cu:10 |
C:0.03, Si:0.2, Fe:0.5 |
| Low-Expansion (Ni36) |
Ni:36, Fe:64 |
C:0.02, Mn:0.3, Si:0.1 |
Product Specifications
| Item |
Detail |
| Surface Finish |
Annealed (Ra ≤0.8μm) or bright rolled (Ra ≤0.4μm) |
| Cutting Options |
Slit strips, cut-to-length pieces, or continuous rolls |
| Length per Roll |
50m, 100m, 300m (on 300mm diameter plastic spools) |
| Adhesion Strength |
≥150MPa (layer bond strength, ASTM D3163) |
| Packaging |
Vacuum-sealed in moisture barrier bags with desiccants |
Typical Applications
- Domestic appliance thermostats (ovens, water heaters, dryers)
- Overcurrent protection devices (motor overload relays)
- Fire safety sensors (heat detectors)
- Automotive underhood temperature switches
- Industrial process temperature regulators
We provide custom slitting, forming, and heat treatment services for P675R strips. Free samples (100mm × 20mm) and thermal deflection test reports are available upon request.
