HumiSeal AR10 Low Outgas Acrylic Conformal Coating

HumiSeal® AR10 is a proven solution for engineers seeking long-term protection of electronic assemblies in demanding environments. This acrylic conformal coating offers a unique combination of ease of use, excellent electrical insulation, and low outgassing—making it an industry favorite for protecting PCBs in sectors such as aerospace

Key Features at a Glance

• ✔ Tack-free in 15-20 minutes at room temperature
• ✔ Compatible with “no-clean” flux residues
• ✔ Low outgassing NASA ASTM E595

Application methods

Whether you’re using spraying, dipping, or brushing, AR10 offers flexibility in manufacturing workflows. It can be diluted with HumiSeal® Thinner 501 to fine-tune application characteristics based on part geometry and production scale. The coating cures at room temperature in 24 hours, allowing integration into both batch and inline processes.

Application Methods:

• Spray: Dilute with HumiSeal® Thinner 501 (Recommended ratio 1:1)
• Dip: 5–15 cm/min withdrawal rate
• Brush: For touch-up applications

Cure the coating at room temperature (24 hrs) for convenience, or accelerate with thermal curing to match fast-paced production cycles.

Application Tip:
Coverage on the components will depend on the application method. With single layer for a board with tall components we would expect the thickness on the edges to be low. In this case, multi layer application will improve the coverage.

Alternatively an approach called "Dry Spray" may help. “Dry Spray” means to apply coating under high atomisation and low flow rate in multiple passes with spray coating method. Drying in between layers is quite quick.

Application Compatibility

It integrates well with lead-free processes, supports standard cleaning practices, and offers strong performance even on flux-contaminated surfaces.

Compatible With:

• ✔ Compatible with “no-clean” flux residues
• ✔ Common PCB finishes including ENIG, HASL, and OSP
• ✔ High-reliability applications requiring low ionic content
• ✔ Lead-free and RoHS-compliant manufacturing environments
• ✔ Cures at room temperature (24 hrs)

Additionally, its UV fluorescence ensures easy inspection, and the coating is reworkable using standard HumiSeal strippers—ideal for repairable designs and serviceable assemblies.

Low Outgassing 🧪

HumiSeal® AR10 is engineered for mission-critical electronic assemblies where low outgassing performance is essential. Qualified to NASA ASTM E595 requirements, it provides reliable environmental protection for printed circuit boards operating in space, vacuum, and other highly sensitive environments. 

Fluorescent for Inspection 💡

To simplify quality assurance, HumiSeal® AR10 fluoresces under UV light, making it easy to confirm proper coating coverage during post-application inspection—an essential feature for high-reliability electronics manufacturers.

Repairable and Reworkable 🔁

Unlike many conformal coatings, HumiSeal® AR10 is easily repairable. Should rework or component replacement be required, the coating can be selectively removed using HumiSeal® Stripper 1080/1080EU, making it ideal for prototyping, low-volume builds, or field serviceability.

Reliable Across Environments 🌍

With a wide thermal shock range of –65°C to +125°C and resistance to fungus (ASTM G21) and moisture, AR10 ensures consistent performance across varied environmental conditions. It’s particularly well-suited for mission-critical systems exposed to humidity, mechanical stress, or temperature cycling.