PFAS-Free Coatings for Film Applications: Technical Options and Performance Trade-Offs

PFAS-free coating technologies can generally be grouped into three major approaches:

• Silicone-based coatings

• Organic-inorganic hybrid coatings

• Surface-engineered coatings

These approaches are increasingly being evaluated as alternatives to fluorinated coatings across industries including electronics, construction materials, packaging, automotive components, and medical devices.

Performance requirements vary by application, but achieving water repellency, anti-smudge performance, durability, and optical transparency without fluorinated materials remains a common challenge.

In recent years, attention has increasingly shifted from material composition alone to surface and interface engineering to achieve desired functional performance.

Among PFAS-free coating technologies, silicone-based coatings are currently one of the most widely used approaches. Due to their molecular structure, silicones exhibit relatively low surface energy, allowing them to provide water repellency, slip performance, and release properties without the use of fluorinated materials.

Because of these characteristics, silicone-based coatings are commonly used in anti-smudge coatings for electronic devices, release applications, and packaging materials.

However, silicone materials generally do not achieve the same level of oil repellency as fluorinated coatings. As a result, their suitability depends on the performance requirements of the target application. To address these limitations, recent developments have focused on combining silicones with inorganic materials or highly durable resins to enhance overall performance.

Key advantages

Proven and widely adopted technology

Excellent water repellency and release performance

Good processability for industrial production

Key challenges

Limited oil repellency compared with fluorinated coatings

Durability may require additional material design

Organic-inorganic hybrid coatings combine organic polymers with inorganic materials to achieve a balance of flexibility, durability, and optical performance. This approach leverages the strengths of both material classes, enabling performance characteristics that are difficult to obtain using a single material system.

For example, dispersing inorganic particles such as silica within a resin matrix can improve surface hardness and abrasion resistance while maintaining transparency. Material composition can also be tailored to optimize properties for specific applications.

As a result, organic-inorganic hybrid coatings are widely used in display protection, electronic component coatings, and other applications where both mechanical durability and functional performance are required.

Key advantages

High hardness and abrasion resistance

Good optical transparency

Flexible material design options

Key challenges

More complex formulation and manufacturing processes

Performance depends on particle dispersion and interface design

In recent years, increasing attention has been given to surface engineering approaches that achieve anti-smudge performance through surface structure and interface design rather than relying solely on material chemistry.

By creating micro- or nano-scale surface features, the contact area between liquids and the surface can be reduced, making it more difficult for water, oils, and contaminants to adhere. Surface energy distribution can also be engineered to influence liquid behavior and improve surface functionality.

These approaches are being explored for applications such as anti-smudge building materials, self-cleaning surfaces, and advanced functional films. Because they can reduce dependence on fluorinated materials, they are considered a promising direction for future PFAS-free technologies. However, challenges remain in terms of durability, manufacturing scalability, and integration with existing production processes.

Key advantages

Reduced reliance on material chemistry alone

Potential self-cleaning functionality

Broad design flexibility

Key challenges

Manufacturing complexity

Long-term durability of surface structures

Scale-up for industrial production

Although PFAS-free coating technologies continue to advance, replacing the unique performance characteristics of fluorinated materials remains a significant challenge.

For film applications in particular, properties such as oil repellency, optical transparency, and low refractive index are often difficult to achieve simultaneously without fluorinated materials. As a result, coating design typically requires balancing multiple performance requirements rather than simply replacing one material with another.

One of the most significant challenges is achieving oil repellency.

Fluorinated materials possess extremely low surface energy, enabling them to repel not only water but also oils and other contaminants. This characteristic has made fluorinated coatings widely used in anti-smudge and easy-clean applications.

Most PFAS-free alternatives, including silicone-based and hydrocarbon-based materials, generally exhibit higher surface energy than fluorinated materials. As a result, achieving equivalent oil repellency can be difficult.

To address this challenge, current development efforts increasingly combine material selection with surface engineering, coating architecture, and interfacial design to improve anti-smudge performance.

Key challenge

Maintaining strong oil repellency without fluorinated materials remains one of the most difficult technical hurdles for PFAS-free coatings.

For applications such as displays, optical films, and protective covers, transparency is a critical performance requirement.

Many PFAS-free coating systems rely on inorganic particles to enhance durability and surface functionality. However, particle size, dispersion quality, and refractive index mismatch can lead to light scattering and reduced optical clarity.

As a result, careful control of particle design, dispersion technology, and coating structure is required to maintain high transparency while achieving the desired functional properties.

Key challenge

Balancing transparency and durability often requires sophisticated material and process design.

Low refractive index materials are important for anti-reflective and optical film applications. Fluorinated materials have traditionally been attractive for these applications because they naturally exhibit relatively low refractive indices.

PFAS-free alternatives often require different approaches, such as porous structures, silica-based materials, or advanced composite designs to achieve similar optical performance.

These solutions must also maintain sufficient mechanical strength, durability, and manufacturing compatibility, creating additional design challenges.

Key challenge

Achieving low refractive index while maintaining durability and manufacturability remains a key development area for PFAS-free optical coatings.

Display films require a unique combination of optical performance, anti-smudge functionality, and mechanical reliability. Achieving these requirements without fluorinated materials remains a key challenge for PFAS-free coating technologies.

Transmittance and haze

High transparency and low haze are essential for display applications. PFAS-free coatings must maintain optical clarity while providing the required surface functionality.

Compatibility with AR/AG coatings

Display films are often combined with anti-reflective (AR) and anti-glare (AG) coatings. PFAS-free surface treatments must be compatible with these optical layers without compromising visual performance.

Abrasion resistance

Display surfaces are subject to repeated contact and cleaning. Therefore, PFAS-free coatings must provide sufficient abrasion resistance while maintaining anti-smudge properties and optical quality.

Long-term reliability

Display films must retain their performance over time under various environmental conditions. Long-term durability and stability are important considerations when developing PFAS-free coating systems.

DNP is developing PFAS-free coating technologies by integrating material design, particle dispersion, and advanced coating process technologies. Through this approach, DNP aims to achieve anti-smudge performance without the use of fluorinated materials while maintaining the functionality required for demanding applications.

At the material level, DNP optimizes the balance between anti-smudge performance and durability through the use of silicone-based and organic-inorganic hybrid materials. In addition, surface engineering techniques are incorporated to achieve high levels of anti-smudge performance without relying on fluorinated compounds.

Achieving stable coating performance also requires precise control of particle dispersion and resin formulation. DNP's proprietary dispersion technologies improve material uniformity, enabling coatings that maintain high optical transparency even in optical film applications.

Furthermore, DNP optimizes coating and drying processes to precisely control coating thickness and surface structure. This integrated approach enables PFAS-free films that deliver performance comparable to conventional fluorinated coatings, making them suitable for display film applications where both anti-smudge functionality and optical performance are required.

Ideally, PFAS-free material selection should be considered during the early stages of product development. Evaluating alternatives late in the design process can lead to additional testing, redesign efforts, and increased development costs. For products intended for global markets, many companies are incorporating PFAS-free solutions from the initial design phase to mitigate future regulatory risks.

Evaluation should consider multiple performance requirements, including water and oil repellency, anti-smudge properties, abrasion resistance, adhesion, and optical performance. For display and optical film applications, transparency and haze are often among the most critical factors.

In many cases, PFAS-free coatings can be processed using existing coating equipment. However, adjustments to coating conditions, drying profiles, or process parameters may be required depending on the material formulation and performance requirements.

Current PFAS-free technologies may not always replicate the oil repellency of fluorinated materials using a single material alone. As a result, many solutions combine material design, surface engineering, and coating architecture to achieve practical anti-smudge performance.

The European Union is currently the primary driver of PFAS regulatory discussions. The proposed restrictions under evaluation by the European Chemicals Agency (ECHA) are influencing material selection and product development across multiple industries worldwide.

One of the primary benefits is reducing future regulatory and compliance risks. PFAS-free solutions can also support sustainability initiatives, improve supply chain resilience, and help companies prepare for evolving environmental requirements.

PFAS-free coatings are gaining attention not only as a response to evolving regulations but also as a proactive strategy for addressing future material restrictions and supply chain risks.

At the same time, maintaining anti-smudge performance, optical clarity, and durability without fluorinated materials requires an integrated approach that combines material design, particle dispersion, and coating process technologies.

For optical film applications in particular, achieving the right balance between anti-smudge properties, transparency, and long-term reliability presents unique technical challenges. Careful evaluation of both material systems and coating technologies is essential when transitioning to PFAS-free solutions.

DNP offers PFAS-free coating solutions optimized for a wide range of optical and functional film applications. Please contact us to discuss your technical requirements and development challenges.