BS C107 / Cu-DPA Arsenical Copper

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2.1491 (CuAsP) is a copper alloy with a small addition of arsenic which enhances tensile strength properties at elevated operating temperatures up to 300°C. As well as increasing the softening resistance, the arsenic also enhances corrosion resistance in specific environments. This grade is deoxidised, which gives it freedom from hydrogen embrittlement, making it ideal for applications requiring welding and brazing. C107 has excellent fabrication characteristics and is typically specified for boiler plates and stay bolts in steam locomotive fireboxes. It shows the following features and properties:

  • Enhanced strength levels over standard copper
  • Retention of properties at elevated temperatures
  • Good conductivity levels
  • Good corrosion resistance
  • Outstanding formability
  • Excellent joining properties
  • Related Standards

    Equivalent Materials

    This material data has been provided by Matmatch.

    "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.

    Ashby charts




    Max service temperature

    300 °C

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    Chemical properties



    0.3 - 0.5 %

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    0.03 %

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    0.03 %

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    Technological properties

    Application areas

    Rail: Steam locomotive staybolts, rivets and boiler plates;Chemical processing: Chemical plant and equipment for relatively non-corrosive liquids and gases at moderately elevated temperatures

    Corrosion properties

    Good corrosion resistance