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STOL® 95 R540S

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It is a CuCrZr alloy that can be hardened by cold forming and by precipitation of CuCrZr - phases during a heat treatment. It has good bendability, excellent hot and cold forming properties, a high strength and a good corrosion resistance. Due to the CrZr-precipitations the relaxation properties, even at temperatures up to 250°C are excellent. The electrical and thermal conductivity is excellent. Welding, soldering and brazing properties are good too. The alloy is registered in the US by EPA to have good antimicrobial properties.

Equivalent Materials

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"Typical" values were obtained via a literature search. "Predicted" values were imputed via artificial intelligence technology. While we have placed significant efforts in ensuring data accuracy, "typical" and "predicted" data should be considered indicative and verified by appropriate material testing. Please do contact us if additional information on the the predicted data method is required.
All metrics apply to room temperature unless otherwise stated. SI units used unless otherwise stated.
Equivalent standards are similar to one or more standards provided by the supplier. Some equivalent standards may be stricter whereas others may be outside the bounds of the original standard.

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23.0 °C

8.9 g/cm³

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Bendability 180°, bw

23.0 °C

2 [-]

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r = x t, t <0.5mm

Bendability 180°, gw

23.0 °C

2.5 [-]

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r = x t, t <0.5mm

Bendability 90°, bw

23.0 °C

1.5 [-]

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r = x t, t <0.5mm

Bendability 90°, gw

23.0 °C

1.5 [-]

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r = x t, t <0.5mm

Elastic modulus

23.0 °C

137 GPa

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cold formed

Elongation A50

23.0 °C

8 %

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Hardness, Vickers

23.0 °C

160 - 190 [-]

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Tensile strength

23.0 °C

540 - 620 MPa

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Yield strength Rp0.2

23.0 °C

500 MPa

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Coefficient of thermal expansion

300.0 °C

1.8E-5 1/K

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for 20°C to the mentioned temperature

Specific heat capacity

23.0 °C

381 J/(kg·K)

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Thermal conductivity

23.0 °C

330 W/(m·K)

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Electrical conductivity

23.0 °C

5.00E+7 - 5.20E+7 S/m

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Specific Electrical conductivity

86 % IACS

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Chemical properties



0.2 - 1.2 %

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0.1 %

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0.1 %

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0.05 - 0.25 %

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Technological properties

Application areas

Automotive: Switches and Relays, Contacts, Connectors, Terminals, Press fits, Hybrid Cars. Electrical: Switches and Relays, Contacts, Connectors, Terminals, Press fits, Components for the electrical industry, Stamped parts, Semiconductor Components, Junction Boxes, Photovoltaic Systems.



Cold Forming


Corrosion properties

STOL® 95 is resistant to pure water vapour and non oxidizingacids and alkalis as well as neutral saline solutions. The material is insensitive to stress corrosion cracking.

Heat Treatment

Temper: R540S


Rating 20, less suitable


This alloy is in accordance with RoHS 2002/96/CE for electric & electronic equipments and 2002/53/CE for automotive industry. It is suitable for high voltage applications as hybrid cars or photovoltaics.


Electroplating is excellent


Gas Shielded Arc Welding: Excellent, Laser Welding: Fair

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