A tool-free process for producing complex metal components with tight tolerances and clean edges.
Chemical etching metal processes have become a cornerstone of modern precision manufacturing, especially when designs demand intricate geometries, thin materials, and absolute consistency. As a key technology in modern manufacturing, metal chemical etching has evolved alongside advancements in materials science, enabling new levels of precision and innovation. At Elcon Precision, metal chemical etching is more than a standalone service. It’s one of our foundational capabilities that support advanced brazed assemblies and ceramic-to-metal systems operating in extreme environments and in the most critical sectors.
With over 50 years of experience, Elcon combines photochemical etching expertise with deep knowledge of downstream integration, enabling engineers to move from concept to high-reliability assemblies with confidence. Our process is highly versatile and works on almost all metals, including stainless steel, nickel, aluminum, and titanium.
The aerospace industry is one of the key sectors that benefits from Elcon's precision and reliability of chemical etching.
Already Prepared to Talk to an Engineer? Let's Get Right to It!
What Is Chemical Etching?
Chemical etching, also called chemical metal etching or photochemical machining, is a subtractive and precise machining process that uses corrosive chemicals, known as chemical etchants, to selectively remove material from a metal sheet. Instead of mechanical force or heat, chemistry creates the final geometry.
In plain terms: a protective mask defines the part shape, and a chemical etchant dissolves only the exposed metal, producing highly accurate features without stressing or distorting the material. Ferric chloride is a commonly used chemical etchant in this process. The etching relies on a controlled chemical reaction, where the corrosive chemical interacts with the exposed metal to remove unwanted areas, enabling precise and intricate designs.
How Chemical Etching Differs from Other Processes
- Machining: Tool contact can introduce burrs, stresses, and tool wear limitations.
- Stamping: Requires expensive hard tooling and is less flexible for design changes.
- Laser cutting: Uses heat, which can affect microstructure and edge quality.
- Other manufacturing processes: Methods such as wire EDM, water jet, and acid etching each offer unique advantages and limitations. Wire EDM provides high precision for thick materials, but is a slower process and much more costly from a part price consideration. Water jet cutting achieves accurate results without heat-affected zones but may not match the fine detail possible with chemical etching. Acid etching is ideal for customizing flat metal sheets with precise, burr-free features, but is generally limited to flat geometries.
Chemical etching eliminates these constraints. It is especially well-suited for:
- Thin metals
- Complex geometries
- Tight feature spacing
- Applications requiring flatness and burr-free edges
Compared to other manufacturing processes, chemical etching offers lower tooling costs and is particularly advantageous for low-volume production, making it a cost-effective and flexible choice for prototypes and small batch runs.
For engineers asking, “What is chemical etching and when should I use it?”, the answer is when precision, flexibility, and material integrity matter most.
The Chemical Etching Metal Process
Elcon’s metal chemical etching process requires careful control of temperature, pressure, and other parameters to ensure precision, repeatability, and scalability.
The process begins with the selection of the required sheet metal, typically with thicknesses ranging from 0.000394" (0.010mm) to 0.0984" (2.5mm) and sheet sizes up to 23.62" (600mm) by 59.06" (1500mm).
Photoresist Application
A UV light-sensitive photoresist is applied uniformly to the metal sheet. Good adhesion of the photoresist is essential for highly repeatable, blemish-free components in metal chemical etching.
Imaging and Development
High-resolution photo tools transfer the design pattern onto the photoresist as part of the photo etching and photochemical machining process. Exposed areas are developed, revealing metal where material will be removed. The unexposed photoresist is removed, exposing the raw material, while the remaining photoresist protects the sheet during the etching process.
Controlled Chemical Removal
A variety of etching chemicals and chemical solutions are used in the metal chemical etching process, with ferric chloride being a common choice, especially for etching copper. The sheet passes through etching chambers where the etching solution reacts with the exposed metal surface, dissolving only the unprotected areas to create the final design. Selecting the correct metal type and ensuring material compatibility is crucial, as chemical etching is suitable for almost all types of metal, including aluminum, copper, nickel, titanium, and stainless steels. The process can handle different materials and a wide range of metal thicknesses, including extremely thin materials that are difficult to process with other methods. More than 2000 different metal types and grades can be etched, and features can be etched on both sides of the material if required.
Etch depth and feature fidelity are carefully monitored to achieve high precision and tight tolerances, with tolerances as low as ±0.020mm and a minimum standard feature size of 0.075 mm, smaller apertures are possible with further development. The etching process results in a slightly beveled edge (about 20% of the metal thickness), but this does not compromise the precision or function of the part. Chemical etching produces intricate components, detailed designs, and precision components that are burr-free and stress-free, preserving the original metal properties. After etching, the remaining photoresist is removed to reveal the final etched components.
Final Inspection and Finishing
Parts are cleaned, inspected, and prepared for downstream processes such as forming, plating, brazing, or ceramic metallization. After etching, parts are chemically cleaned to remove any remaining contaminants such as debris, waxes, oils, and other residues that could interfere with subsequent processing steps. Components are then visually and dimensionally inspected using state-of-the-art optical inspection equipment.
This controlled approach delivers consistent results from prototype through full production.
Benefits of Chemical Metal Etching
Chemical etching offers unique advantages compared to mechanical or thermal methods:
- Burr-free edges and stress-free parts
- Fine feature resolution and tight tolerances
- No hard tooling or stamping dies
- Rapid design changes and quick prototyping
- Excellent repeatability and scalability
Chemical etching is a cost-effective solution for high-volume production, capable of processing multiple components from sheet metal at once. The process is suitable for most metals and produces burr-free metal parts with high precision, often within a tolerance of a few micrometers. It is ideal for manufacturing complex geometries and high-precision metal parts for various industries, making it a versatile choice for applications requiring intricate designs and reliable quality.
For evolving designs or low-to-medium volume programs, chemical etching provides unmatched flexibility.
Materials Commonly Chemically Etched
Elcon Precision's team of experts routinely works with:
- Stainless steels
- Copper and copper alloys
- Nickel alloys
- Specialty and exotic metals
Chemical etching is suitable for producing intricate components from a wide range of different materials, including metals and certain plastics. The process is compatible with various metal types, such as stainless steel and copper alloys, and material selection is based on both etchability and performance requirements.
Material selection is guided by downstream assembly and brazing requirements. Because etched components are often integrated into complex assemblies, choices are made with electrical, thermal, and mechanical performance in mind, not just etchability.
Chemical Etching at Elcon Precision
At Elcon, chemical etching is rarely the final step. Instead, etched components become functional building blocks inside advanced systems.
Common etched features include:
- Control grids
- Shields
- Current shapers
- Precision internal metal geometries
Chemical etching enables the production of precision components and intricate designs, including intricate components and microscopic structures essential for electronic devices.
These elements are frequently integrated with:
- Ceramic metallization
- Precision brazed assemblies
- Hermetic ceramic-to-metal seals
This systems-level approach is why Elcon’s etching expertise matters for high-voltage, high-vacuum, and high-reliability environments. Engineers gain a partner who understands not just how to make the part, but how that part must perform inside the final assembly. The final design of these components is achieved with high accuracy and complexity, supporting advanced system performance.
Applications & Industries
Elcon supports demanding applications across various industrial sectors:
- Aerospace and space systems
- Defense and RF/vacuum electronics
- Photonics and optics
- Advanced energy and nuclear-adjacent systems
Chemical etching is widely used in various industries, including electronics, aerospace, and medical devices, due to its versatility and ability to produce high-precision components. The components produced through metal chemical etching include lead frames, EMI/RFI shielding, connector pins, surgical instruments, and intricate decorative metal parts. In the electronics industry, chemical etching is essential for manufacturing printed circuit boards (PCBs), integrated circuits (ICs), and microelectromechanical systems (MEMS), which are critical for modern electronic devices. In the aerospace industry, chemical etching is utilized to create complex geometries and high-precision components such as heat exchangers, shims, and fuel cell parts, where precision and accuracy are vital for components to withstand extreme conditions. The medical device industry also relies on chemical etching to manufacture devices such as stents, catheters, and surgical instruments, where intricate features and accuracy are crucial for performance and safety.
In each case, chemical etching enables precision features that directly support overall system performance.
Looking for a Chemical Etching Partner Who Understands Your Full System?
Whether you’re exploring chemical etching metal for the first time or replacing a legacy process, Elcon Precision offers the experience, technical depth, and integration capability to move your design forward.
Request a Quote
Discuss Your Design
Let’s explore how chemical etching can become a strategic advantage in your next high-reliability program.
