Parylene FAQs

Welcome to our Parylene FAQs guide. Here you’ll find clear answers about Parylene coatings—what they are, how they work, their benefits, and why industries worldwide rely on them for long-term protection. Find out more from our Parylene FAQs.

What Is Parylene and Why Is It Used?

Invisible. Reliable. Long-lasting.

Parylene is an ultra-thin, transparent, pinhole-free conformal coating that protects electronics, medical devices, aerospace systems, and other high-value components. Applied by a unique chemical vapour deposition (CVD) process, it delivers protection that liquid coatings cannot match.

 

How Does Parylene Work?

During deposition, Parylene is formed molecule by molecule inside a vacuum chamber. The vapour penetrates everywhere air can reach—around corners, recesses, and edges—before polymerising directly on the surface.

This produces a 360° conformal layer that is smooth, uniform, and pinhole-free. It ensures total coverage of intricate assemblies while preserving size, weight, and performance.

What Are the Key Benefits of Parylene?

Parylene coatings deliver reliable, long-term protection without altering product design. Unlike liquid coatings, Parylene is applied as a gas, creating an ultra-thin, pinhole-free barrier.

Benefits at a glance:

🌊 Moisture & corrosion resistance

🧪 Chemical protection against solvents and fuels

🔍 Complete coverage, even in cavities and edges

✨ Ultra-thin & transparent (microns thick)

⚡ High reliability with reduced failures

🌡 Thermal stability across extreme temperatures

🩺 Biocompatibility (Parylene C & N for medical use)

🌍 Environmentally responsible process

Where Is Parylene Used?

Parylene works behind the scenes in many industries where performance and reliability are critical:

  • Electronics & PCBs – prevents corrosion and shorts
  • Medical Devices – inert, biocompatible barriers for instruments & implants
  • Aerospace & Defence – reliable under heat, cold, and chemical stress
  • Automotive Systems – protects sensors and electronics in harsh conditions
  • Consumer Products – wearables, hearing aids, drones, marine electronics

How Do Parylene Coatings Compare to Traditional Coatings?

Parylene vs. Liquid Conformal Coatings:

  • Coverage: Parylene offers true 360° coverage; liquids struggle in tight gaps.
  • Film Quality: Parylene films are pinhole-free; liquids may have brush marks or runs.
  • Design Impact: Parylene is ultra-thin & transparent; liquids are thicker and bulkier.
  • Masking: Parylene requires pre-deposition masking; liquids risk overspray.

What Are the Different Types of Parylene?

Each Parylene type offers unique strengths:

  • Parylene N – low dielectric constant, excellent dielectric properties.
  • Parylene C – strong moisture/chemical barrier, biocompatible.
  • Parylene D – higher thermal stability and mechanical strength.
  • Parylene F (AF-4) – superior high-temperature and UV resistance.

Why Do Manufacturers Choose Parylene?

Because it guarantees maximum reliability and long service life. For end users, this means safer, more durable products that withstand sweat, saltwater, vibration, and heat.

Useful Links

For deeper insights into Parylene:

Why Choose SCH Services for Conformal Coating and Parylene?

Partnering with SCH Services means more than just outsourcing — you gain a complete, integrated conformal coating and Parylene solution backed by decades of hands-on expertise.

✅ 25+ Years of Expertise – Specialists in conformal coating and Parylene processing, trusted by aerospace, medical, defence, and electronics industries worldwide.

✅ End-to-End Support – Guidance on coating selection, Parylene grades, masking strategies, application methods, and inspection to ensure compliance and reliability.

✅ Scalable Solutions – From small prototype batches to full-scale, high-volume production, SCH delivers flexible capacity that grows with your needs.

✅ Global Reach – Responsive technical support and supply coverage across Europe, North America, and Asia.

✅ Proven Reliability – A strong reputation built on quality, consistency, and customer satisfaction in conformal coating and Parylene services.

📞 Call: +44 (0)1226 249019

✉ Email: sales@schservices.com

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