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Parylene coating providing invisible protection for electronic components against moisture and environmental damage

The Hidden Protector: How Parylene Safeguards What You Don’t See

Parylene

When it comes to protecting modern electronics and critical components, the greatest threats are often the ones you cannot see. Microscopic cracks, invisible moisture, and environmental contaminants all pose silent risks to performance and long-term reliability. This is where Parylene coating excels β€” acting as an ultra-thin, invisible shield that delivers durable, long-term protection.

Learn more about SCH Services’ specialist Parylene coating services here.

The Power of Parylene Coating

Unlike traditional conformal coating methods that are brushed, dipped, or sprayed, Parylene is applied using a specialised vapour deposition process. This process allows the coating to polymerise directly onto the surface, forming a uniform, pinhole-free layer that fully encapsulates components.

The result is a truly conformal barrier that coats not only visible surfaces but also sharp edges, internal geometries, and hidden crevices that liquid-applied coatings often struggle to reach.

Invisible Moisture Protection

Moisture remains one of the leading causes of electronic failure. Even minimal condensation can lead to corrosion, leakage currents, or short circuits. Parylene provides exceptional moisture resistance by forming a continuous microscopic film that significantly reduces water vapour ingress.

This makes Parylene particularly effective in harsh, humid, or environmentally demanding applications where traditional coatings may degrade or fail over time.

Why Industries Rely on Parylene

Industries such as aerospace, automotive, medical devices, and consumer electronics rely on Parylene because of its proven performance and reliability. It is lightweight, chemically resistant, biocompatible, and stable across a wide temperature range β€” making it suitable for applications where failure is not acceptable.

SCH Services Ltd – Your Partner in Invisible Protection

At SCH Services Ltd, we specialise in both liquid and Parylene conformal coating services, providing tailored solutions to meet specific environmental and performance requirements. Whether protection is needed against moisture, chemicals, or long-term environmental exposure, Parylene offers reliable defence against unseen threats.

Because in many applications, the best protection is the protection you never notice.

For detailed information on Parylene coating capabilities, applications, and process control, visit our Parylene coating services page.

What Is Parylene Coating and Why Is It Different From Other Conformal Coatings?

Parylene

In electronics and advanced manufacturing, protecting sensitive components from moisture, chemicals, and environmental stress is critical. Conformal coatings play a key role in improving reliability and reducing field failures β€” but not all coatings perform the same. Parylene stands out as a highly effective solution when coverage, consistency, and long-term performance matter most.

What Is Parylene?

Parylene is a family of thin, transparent polymer coatings applied using a chemical vapour deposition (CVD) process. Unlike liquid conformal coatings that are sprayed, brushed, or dipped, Parylene is deposited as a vapour in a vacuum chamber. This allows it to coat external and internal surfaces with a uniform, pinhole-free film.

Common Parylene types include:

  • Parylene N – Excellent dielectric properties and strong performance in high-frequency applications.
  • Parylene C – Widely used for outstanding moisture and chemical resistance.
  • Parylene F (AF-4) – Enhanced high-temperature stability and chemical resistance.

How Parylene Differs From Liquid Conformal Coatings

  1. Application method – Vapour deposition in a vacuum chamber delivers even coverage without pooling, meniscus effects, or edge build-up.
  2. Coverage – Parylene can penetrate tight gaps, coat under components, and reach complex geometries that liquid coatings often cannot.
  3. Film properties – Typically ultra-thin (commonly 1–50 Β΅m), transparent, flexible, and suitable for demanding environments.
  4. Performance – Strong resistance to moisture and many chemicals, with stable electrical and dielectric characteristics.
  5. Cleanliness – As a dry, solvent-free deposition process, Parylene avoids solvent residues and is well suited to sensitive applications including medical and aerospace electronics.

Liquid vs Parylene Coating

Comparison between liquid conformal coating and Parylene vapour deposition on electronic assemblies

Comparison between traditional liquid conformal coating and Parylene vapour deposition.

Where Is Parylene Used?

  • Medical devices – Catheters, sensors, pacemakers, and implantable or body-contact components.
  • Aerospace and defence – High-reliability electronics, sensors, and mission-critical assemblies.
  • Automotive – EV electronics, sensors, and ADAS-related components.
  • Consumer electronics – Wearables, IoT products, and microelectronics.

Why Choose SCH for Parylene?

At SCH Services Ltd, we combine decades of coating expertise with a complete Parylene offering:

  • Subcontract coating services – ISO-controlled Parylene coating capability for prototypes through to production.
  • Turnkey Parylene systems – Equipment, dimers, training, and long-term technical support for in-house deployment.
  • Reliable materials supply – Official European distribution partnership supporting consistent dimer availability and quality.

Whether you need immediate coating capacity or a full in-house solution, SCH provides the knowledge, equipment, and materials to support success.

If you would like to discuss Parylene coating for your assemblies or compare options against liquid coatings, get in touch with SCH. To explore SCH’s wider Parylene capabilities, including services, equipment, dimers, and support, visit our Parylene solutions page.

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Conformal Coating UK

Conformal Coating UK
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