Introduction: Why Parylene Stands Out
When it comes to protecting electronic assemblies, manufacturers have many conformal coating choices — acrylics, silicones, urethanes, and epoxies. But when performance and reliability cannot be compromised, Parylene stands apart as the industry benchmark.
At SCH Ltd, we are your complete one-stop partner for all Parylene needs. Unlike providers focused on just one area, we offer the full package: coating services, advanced deposition systems, high-purity dimers, consumables, spares, consultancy, and training.
Whether you’re outsourcing coatings, building in-house capability, or strengthening your supply chain, SCH provides the expertise and resources to make it happen. From our UK base, we deliver reliable end-to-end solutions for electronics, aerospace, automotive, and medical applications.
Our mission is simple: dependable, cost-effective, and scalable results—backed by the experience, infrastructure, and technical knowledge that make SCH the trusted name in Parylene.
Here are five reasons why Parylene is considered the gold standard.
1. Superior Barrier Protection
Parylene creates an ultra-thin, pinhole-free film that acts as a complete barrier against:
- Moisture and humidity
- Corrosive chemicals and solvents
- Salt spray and harsh environments
Unlike liquid coatings, Parylene is applied in vapour form, ensuring coverage even in crevices, under components, and around sharp edges. This uniform protection dramatically improves PCB reliability.
2. Uniform, Conformal Coverage
Because Parylene is deposited molecule by molecule in a vacuum chamber, the coating is:
- Perfectly uniform – even across complex 3D geometries
- Ultra-thin – typically 10–50 microns, avoiding weight or space issues
- Stress-free – no bridging or pooling, unlike liquid coatings
This makes it ideal for miniaturised electronics and dense assemblies where other coatings can’t reach.
3. Outstanding Chemical & Moisture Resistance
Parylene has excellent resistance to:
- Water vapour transmission
- Solvents and fuels
- Acidic and alkaline solutions
In industries like automotive (engine control units) or industrial electronics, where exposure to aggressive chemicals is common, Parylene provides unmatched long-term stability.
4. Biocompatibility for Medical Applications
One of the biggest advantages of Parylene is its biocompatibility. Certified to ISO 10993 standards, Parylene coatings are:
- Safe for direct contact with human tissue and fluids
- Widely used in implantable devices such as pacemakers and stents
- Common in diagnostics, wearable tech, and medical sensors
For medical manufacturers, Parylene isn’t just a coating – it’s a compliance pathway that allows devices to pass stringent regulatory requirements.
5. Long-Term Reliability in Harsh Environments
Parylene remains stable across a wide temperature range (-200°C to +150°C), resists UV degradation, and provides dielectric strength for sensitive circuits.
This durability makes it the coating of choice in:
- Aerospace & defence – avionics, satellites, radar systems
- Automotive – EV batteries, ADAS sensors
- Telecoms & IoT – outdoor and remote installations
When downtime isn’t an option, Parylene ensures electronics last.
When to Choose Parylene vs. Other Coatings
While Parylene is the best option for many high-reliability applications, it isn’t always the most economical for low-cost consumer products. Other coatings may suffice when:
- High chemical resistance isn’t needed
- Miniaturisation isn’t an issue
- Repairability is important
However, when failure isn’t an option, Parylene is the safe choice.
Conclusion: The Benchmark for Reliability
From medical implants to aerospace electronics, Parylene has earned its reputation as the gold standard in conformal coating. Its unique deposition process delivers uniform, durable, and biocompatible protection that liquid coatings simply can’t match.
SCH Ltd is your one-stop partner for Parylene, delivering coating services, deposition equipment, dimers, consumables, spares, consultancy, and training.
From our UK base, we provide scalable, cost-effective solutions trusted across electronics, aerospace, automotive, and medical industries.
