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  • Writer's pictureDavide

Hydrophobic Treatment: Enhancing Surface Properties

By altering the surface characteristics at a microscopic level, hydrophobic treatments create barriers that repel water and other liquids, offering a wide array of benefits across various applications and industries. This article delves into the types of hydrophobic coatings and treatments, their application methods and compatibility with different substrates, and their benefits and industry applications.

Types of Hydrophobic Coatings and Treatments

Hydrophobic treatments and coatings are engineered to enhance the surface properties of various materials, imparting them with water-repellent capabilities that significantly increase their functionality and durability.


Nano-coatings represent a cutting-edge category of hydrophobic treatments characterized by their ultra-thin, nanometer-scale thickness. These coatings are typically engineered from materials like silica or other silicon-based compounds, which, when applied to surfaces, create a microscopic textured layer. This texture reduces the surface area in contact with water droplets, causing them to bead up and roll off the surface.

UV-Curable Coatings

UV-curable coatings are another innovative form of hydrophobic treatment, distinguished by their rapid curing process under ultraviolet light. Composed of monomers, oligomers, photoinitiators, and various additives, these coatings undergo a chemical transformation when exposed to UV radiation, quickly solidifying into a durable, protective layer. 

Plasma Treatment

Plasma treatments stand out as a sophisticated method for enhancing surface properties through the application of plasma-generated species. This process involves exposing the surface to a plasma, a highly ionized gas containing ions, electrons, and neutral particles, which can effectively modify the surface at an atomic level. Plasma treatments can introduce functional groups to the surface or remove contaminants, thereby increasing its hydrophobicity. 

The distinct advantage of plasma treatments is their ability to precisely control the modification of surface chemistry and topography. Thus enabling tailored surface properties. This method is especially beneficial for materials that are sensitive to heat or chemicals, as it operates at low temperatures and without the need for solvents.

Application Methods and Compatibility

Common application techniques include dipping, spraying, and printing, each suitable for various types of substrates, such as glass, metal, and polymers. Understanding the nuances of these methods and their substrate compatibility is essential for optimizing the hydrophobic properties of surfaces.


Dipping is a straightforward yet effective method for applying hydrophobic treatments, involving immersing the substrate into a solution containing the hydrophobic agent. This process ensures a uniform coating over the entire surface area, making it ideal for complex geometries or parts with hard-to-reach areas. Once removed from the solution, the substrate is typically air-dried.


Spraying offers a versatile and rapid application method for hydrophobic treatments. Utilizing specialized equipment, the hydrophobic solution is atomized and evenly distributed over the substrate's surface. This method allows for precise control over the coating's thickness and can be easily scaled up for large or irregularly shaped items. 


Printing, especially techniques like inkjet or screen printing, presents a highly precise method for applying hydrophobic coatings to targeted areas of a substrate. This localized application is crucial for creating patterns or coatings that only cover specific sections of a surface, making it ideal for electronic applications, textiles, and other specialized uses.

Compatibility with Substrates

The compatibility of hydrophobic treatments with different substrates is a critical consideration in their application. Each substrate presents unique challenges and requirements for effective hydrophobic coating adherence and performance:


Due to its smooth, non-porous surface, glass is an ideal candidate for hydrophobic treatments. These coatings enhance the glass's natural properties, making it more resistant to water, dirt, and smudges, which is particularly beneficial for automotive and architectural applications.


Metals require hydrophobic treatments that can withstand the substrate's expansion, contraction, and potential corrosion. Certain metals may need pre-treatment processes to ensure proper adhesion and longevity of the hydrophobic layer.


The diverse nature of polymers, from soft and flexible to hard and rigid, dictates the choice of hydrophobic treatment. Compatibility is influenced by the polymer's surface energy, porosity, and chemical resistance, necessitating customized solutions for effective hydrophobic performance.

Benefits and Industry Applications

These treatments not only impart superior water repellency but also protect against a wide range of contaminants, contributing to the enhanced durability and maintenance ease of treated surfaces. The unique advantages of hydrophobic coatings have found applications in numerous industries.

Improved Product Performance

By repelling water and other liquids, these coatings prevent the accumulation of moisture, thereby reducing the risk of water damage, corrosion, and mold growth. This is particularly crucial for products exposed to harsh or variable environments, where moisture control is essential for maintaining functionality and reliability. Additionally, hydrophobic treatments can improve the efficiency of devices that rely on surface interactions.

Protection Against Moisture and Contaminants

Hydrophobic treatments create a barrier that not only repels water but also offers protection against various contaminants, including oils, chemicals, and dirt. This protective layer simplifies cleaning processes, as contaminants can be easily washed away with minimal effort, reducing the need for harsh cleaning agents.

Enhanced Durability

By shielding surfaces from moisture and contaminants, hydrophobic treatments contribute to enhanced durability. The reduced exposure to harmful elements prevents wear and tear, preserving the material's structural integrity and appearance over time. This durability is especially beneficial for outdoor and industrial applications.


In the electronics industry, hydrophobic treatments play a critical role in protecting sensitive components from moisture and spillages, which can lead to short circuits and corrosion. The application of hydrophobic coatings on printed circuit boards (PCBs), connectors, and casings enhances the water resistance of electronic devices, including smartphones, tablets, and wearables, thereby increasing their resilience and lifespan.


Optical devices, such as lenses, mirrors, and cameras, benefit from hydrophobic treatments by maintaining clear visibility and performance in wet conditions. These coatings prevent the formation of water droplets that can distort light transmission and reduce image clarity. Additionally, the ease of cleaning treated optical surfaces ensures that they remain free from dust, fingerprints, and smudges, crucial for maintaining optimal optical performance.


The textiles industry has embraced hydrophobic treatments to create water-repellent fabrics for clothing, outdoor gear, and home furnishings. These treatments enhance the functionality and comfort of textiles by keeping the wearer dry and comfortable, extending the fabric's life by protecting against stains, spills, and moisture-induced damage.

Final Thoughts

The team at SCI Automation is comprised of highly experienced professionals, each bringing years of expertise to the table. We are recognized as pioneers in our field. Our commitment is to lead by example, crafting solutions that not only meet but set industry-wide standards.

Our goal is to provide customized solutions tailored to effectively meet your unique requirements and challenges. SCI Automation considers itself more than just a service provider; we see ourselves as your partners in pursuit of excellence. If you have questions or need support with plasma technologies, we encourage you to reach out to our team for expertise and assistance.


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