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KIT: Colour etchant according to BERAHA I

Color etchant according to BERAHA I consists of ammonium hydrogen difluoride (NH₄HF₂), potassium disulfite (K₂S₂O₅) and dilute hydrochloric acid (HCl 6 %). It is mainly used in metallography and scientific laboratories. This product is suitable for the examination of mild and low alloy steels, martensitic and bainitic microstructures, ferritic Cr steels, manganese hard steels, and for the evaluation of brazed joints with brass solder.

The chemical reactions and properties of the color etchant are based on the interactions of the various components with each other. Ammonium hydrogen difluoride forms fluoride ions (F-) and ammonium ions (NH₄⁺) in aqueous solution, causing an etching reaction on metal surfaces. Potassium disulfite serves as a reducing agent and stabilizes the system. The dilute hydrochloric acid helps in the formation of fluoride ions and assists in the intensity of the etching reaction.

The solution is applied by wet etching for 5-20 seconds. After preparation, the solution can be kept for 1-2 hours. It is important to store the stock solution in a plastic bottle because the color etchant has a glass etching effect.

The application of the color etchant according to BERAHA I makes it possible to visualize a wide variety of microstructural properties in the treated metals. This facilitates the investigation and evaluation of materials to optimize their mechanical properties and performance.

Article no.: 18889

For unalloyed and low-alloy steels.

  •   Container size and order number Net price Amount
    KIT: Colour etchant according to BERAHA I - 100 ml
    Order number: 18889.00100
    12,31 €
    KIT: Colour etchant according to BERAHA I - 250 ml
    Order number: 18889.00250
    17,45 €
    KIT: Colour etchant according to BERAHA I - 500 ml
    Order number: 18889.00500
    31,84 €
    KIT: Colour etchant according to BERAHA I - 1.000 ml
    Order number: 18889.01000
    47,16 €
    KIT: Colour etchant according to BERAHA I - 2.500 ml
    Order number: 18889.02500
    99,81 €

Important Information

Warning labels:

Lagerung: 15 … 25 °C

Haltbarkeit: 24 Monate

product information

Components of this kit:
• Ammonium hydrogen difluoride, Artikel-Nr.:18871
• Potassium disulfite, Artikel-Nr.:18949
• Hydrochloric acid 6, Artikel-Nr.:19003

instruction manual

Technical informations

specifications

Instructions / Protocol / Recommendations

Verwendung:

Farbätzmittel für unlegierte, niedrig legierte Stähle. Martensitische und bainitische Gefüge. Ferritische Cr- Stähle. Manganhartstähle. Lötungen mit Messinglot. . Nach dem Ansetzen ist die Lösung für 1-2 h haltbar. Die Stammlösung in einer Kunststoffflasche aufbewahren. Glas ätzend!

Hazard and safety instructions

Signal Word 1: Gefahr
Signal Word 2: skull, acid_red, exclam,
Warning labels: