Wet Etching Indium

Indium, a soft and malleable metal, is known for its unique properties, including high thermal and electrical conductivity, low melting point, and excellent solderability.


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Wet Metal Etching Production workshop-  Shenzhen Xinxin Precision Equipment Co., Ltd.
Indium etching production facility

Indium Characteristics:

Indium possesses several key properties that contribute to its wide-ranging applications:

  1. Low Melting Point: Indium’s low melting point of 156.6°C (313.9°F) allows it to be easily shaped and used in soldering applications.
  2. Softness and Malleability: Indium is a soft and malleable metal, making it easy to form into intricate shapes.
  3. High Thermal Conductivity: Indium exhibits excellent thermal conductivity, making it suitable for heat dissipation in electronic devices.
  4. Electrical Conductivity: Indium is an excellent electrical conductor, further enhancing its applications in the electronics industry.

Metal Etching Indium:

Metal etching is a precise process used to selectively remove material from the surface of indium to create intricate patterns and designs. When etching indium, the choice of etchant is critical for achieving optimal results:

  1. Nitric Acid (HNO3) Solution: Advantages: Nitric acid can be used for controlled etching of indium, offering precise pattern transfer.
  2. Hydrochloric Acid (HCl) Solution: Advantages: HCl solution is effective for etching indium due to its ability to dissolve the oxide layer.
  3. Aqua Regia: Advantages: Aqua regia, a mixture of nitric and hydrochloric acid, is suitable for aggressive etching of indium.

Indium etching equipment

Wet Chemical S650 Indium Etching Machine

Wet Processing Equipment – Indium etching machine

The Indium etching machine is used to spray chemical solution to a copper-clad laminator, aluminum substrate, or stainless steel plate, the exposed copper, aluminum, and stainless steel are etched away, retaining the pattern or circuit covered by the corrosion-proof film, so as to achieve the purpose of making pattern or circuit.

This etching machine is an all-in-one small Indium etching machine that is easy to install and can be used immediately after powering on.

Photo Etching Indium:

Photo etching is a precise process used for intricate designs on indium:

  1. Material Film: Photomasks made of high-quality polymer films with excellent UV resistance are recommended for precise and detailed etching.
  2. Temperature Control: Maintain a stable and controlled temperature during the photoresist exposure and development process to ensure accurate pattern transfer.

Indium’s unique properties make it a valuable material for precision machining, especially in electronics and semiconductors. By understanding the etchants, surface treatment methods, electroforming techniques, metal cleaning, and photo etching processes for indium, manufacturers can achieve exceptional results without compromising the material’s integrity. Applying these insights will enable the production of high-quality indium products tailored to specific applications, ranging from electronic components to soldering materials and beyond.

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how to etch Indium?

Etching Indium Processing Guide

MetalEtchantTemperature (°C)Concentration (%)Estimated Etch Depth (microns)Etch Quality
Etching IndiumNitric Acid (HNO3)Room temperature10-15% HNO32-10High-quality (smooth)
Etching IndiumHydrochloric Acid (HCl)Room temperature10-15% HCl2-10High-quality (smooth)
Etching IndiumAqua RegiaRoom temperature1:3 HNO3 to HCl2-10High-quality (smooth)
Etching Indium Processing Guide

The values provided are approximate and can vary depending on specific etching conditions, including exposure time and the condition of the indium surface. Always conduct test etches and adjust parameters as needed to achieve your desired results. Additionally, safety precautions should be followed when handling these chemicals, particularly in the case of Aqua Regia.

If you have metal wet etching Indium needs, please feel free to contact us.



    Etching Indium Samples