Havar Etchants

Havar, also known as Hastelloy, is a family of high-performance nickel-based alloys known for their excellent corrosion resistance, high-temperature strength, and exceptional performance in harsh environments. Chemical etching of Havar is a process used to create precise patterns, markings, or designs on Havar surfaces, often for manufacturing components in the chemical processing, nuclear, and aerospace industries. Here’s a guide on commonly used methods for etching Havar and how to set important parameters for effective Havar etching:

Commonly Used Havar Etchants

  1. Aqua Regia (Nitric Acid and Hydrochloric Acid Mixture)


  • Chemical Processing: Havar components are used in corrosive chemical environments, and etching may be employed for quality control, surface treatment, and marking.
  • Aerospace: Havar is used in aerospace applications, and etching can be used for surface preparation and quality inspection.

Setting Parameters:

  • Concentration: Aqua regia is a mixture of nitric acid and hydrochloric acid in varying proportions. The specific concentration may vary depending on the specific etching requirements.
  • Etching Time: The etching time varies based on the desired result and the thickness of the Havar, ranging from minutes to several minutes.
  • Temperature: The etching process is often performed at room temperature, but the specific temperature may vary depending on the application.

Setting Parameters in a Havar Etching Operation

For an effective Havar etching operation using aqua regia as an example:


  • Mix the nitric acid and hydrochloric acid in the desired proportions for the specific etching task. Be precise and exercise caution as both acids can be hazardous.

Etching Time:

  • Determine the appropriate etching time based on the thickness of the Havar and the desired pattern or surface modification. Start with a short duration and adjust as needed.


  • Perform the etching at room temperature or the appropriate temperature for your specific application.


  • Prioritize safety when working with nitric acid and hydrochloric acid. Always wear appropriate personal protective equipment (PPE) such as gloves, safety goggles, and lab coats. Maintain a well-ventilated workspace with safety showers and eyewash stations.


  • Maintain proper ventilation to dissipate fumes and gases generated during the etching process. Use a fume hood if available.

Waste Disposal:

  • Dispose of used etchant solutions following local regulations, as nitric acid and hydrochloric acid waste is often considered hazardous. Proper handling and disposal are crucial.

If you have an Havar etching project that you need help with, please contact us