Electronics Coatings, Assembly Adhesives, and Conformal Coating Masking Materials

Dual-Cure 9771 Conformal Coating for PCBs

Feature Article by Dymax
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Dual-Cure 9771 Conformal Coating by Dymax offers superior PCB protection with low outgassing and ionic content.

Developed to meet the strike requirements of the aerospace and defense market, Dual-Cure 9771 conformal coating by leading UV/LED light-curable materials manufacturer Dymax, is ideal for protecting printed circuit boards in missiles, satellites and other space devices where exposure to extreme conditions are an obstacle.

Dual-Cure 9771 conformal coating cures with UV/Visible light and features a secondary moisture-cure function to ensure complete cure of coating that flows into shadow areas.

9771 NASA low outgassing conformal coating meets ASTM E595 TML and CVCM, UL 94 V0, UL 746E, MIL-I-46058C listed (pending), IPC-CC-830-B approved (pending) and in full compliance with the RoHS2 Directives 2015/863/EU.

Features & Benefits

  • ASTM B117 Salt Fog ResistanceMeets ASTM E595 low outgassing
  • Low iconic content compliance with Mil-Std 883 Method 5011
  • UL 746-E and UL94V-0 flammability
  • UV/Visible light cue with secondary moisture cure for shadow areas
  • Excellent corrosion resistance
  • Temperature and humidity resistance
  • Fluoresces bright blue for easy inspection

This UV conformal coating provides a cleaner PCB during extreme conditions due to its low outgassing and ionic content. It can be used to protect critical electronic devices commonly found within military and aerospace systems and meets MIL-STD 883 Method 5011 standards for missiles, satellite, and space applications that are exposed to extreme conditions. It is also NASA MAPTIS Listed (Material Code 09841).

The 9771 also features a highly visible bright blue fluorescent tracer for simple quality inspection under black light. It is a Dual-Cure conformal coating, able to cure with both UV/Visible light and moisture to reach shadow areas. It’s a 100% solids alternative to solvated coatings providing a thin, protective coating without excessive weight to the PCB.

9771 Performance & Testing

Mil-Std 883 Junction Coating Type II
9771 passed the following Mil-Std 883 Method 5011.7 tests:

  • Thermal stability and filler content via thermogravimetric analysis
  • Specific ion content
  • Totally ionic content
  • Hydrogen ion content (pH)
  • Volume resistivity

ASTM E595 Outgassing

ASTM E959 Outgassing

ASTM B117 Salt Fog Resistance

Testing: Coating thickness of 0.005″ (127 exposed to 35°C, 5% salt solution for 500 hr.

Results: No disruptive change by flash over, spark over or break-down in house voltage transient test (based on UL-746E) as well as no corrosion present on boards.

Heat & Humidity 85°C/85% R.H.Heat & Humidity 85°C/85% R.H.


Dymax manufacture light-curable adhesives, coating, and maskants as well as compatible dispensing and curing equipment. They focus on creating solvent-free materials that cure clean, green, and fast, helping engineering teams accomplish more in less time and with less negative impact on the environment.
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