Din 50961 Fe Zn 8b [ 480p ]

By decoding the standard—Fe for steel, Zn for zinc, 8 for microns, and b for blue—you empower yourself to specify, inspect, and criticize surface coatings with authority. Whether you are restoring vintage hardware or designing the next generation of electric vehicle fasteners, understanding this code ensures your parts survive their intended service life without costly field failures.

| Component | Meaning | Details | | :--- | :--- | :--- | | | The governing standard | German industrial standard for electroplated zinc coatings on iron and steel. Superseded by DIN EN ISO 2081 (but still widely used in legacy drawings). | | Fe | Base Material | Ferrous material (Iron/Steel). The coating system is designed for steel substrates. | | Zn | Coating Material | Zinc . The primary metallic layer applied via electroplating. | | 8 | Coating Thickness | 8 µm (microns) minimum local thickness of the zinc layer. | | b | Post-Treatment Type | Blue passivation (iridescent blue to slightly yellowish/rainbow effect). Low chromate (Cr III or Cr VI historical). | din 50961 fe zn 8b

However, ISO 2081 no longer ties specific corrosion resistance to color; you must specify required hours to white/red rust separately (e.g., "≥12 h to white rust"). By decoding the standard—Fe for steel, Zn for

Modern enforcement of and REACH restricts hexavalent chromium (Cr(VI)) in passivation layers. Traditional "type b" blue chromate often contained Cr(VI). Superseded by DIN EN ISO 2081 (but still