What Is HumiSeal UV80LED Dual Cure Conformal Coating?
HumiSeal UV80LED Dual Cure Conformal Coating is a high solids, UV curable, urethane acrylate conformal coating from HumiSeal (Chase Corporation). It is a dual cure material: exposed areas cure under 395nm LED UV light, while a secondary moisture cure finishes any shadowed areas over approximately 7 days at ambient conditions.
What Are the Key Features of HumiSeal UV80LED?
- Low viscosity formulation, applied without pre-heating
- Fluoresces under UV light, making coverage easy to inspect
- Tack-free cure under a 395nm LED lamp system
- Secondary moisture cure completes curing in shadowed areas
- Fungus resistant
- Excellent adhesion and moisture resistance
- Minimum solids content of 98% by weight
- Compliant with IPC-CC-830, RoHS, China RoHS 2 and UL 94V-0
What Is HumiSeal UV80LED Used For?
- Conformal coating of electronic assemblies
- Application via selective coating equipment
- Application via conventional hand spray
- Brushing, for rework or touch-up only
How Does the Dual Cure Process Work?
This coating cures in two stages. A 395nm LED lamp system delivers a minimum dose of 3 J/cm² to give a tack-free surface on exposed areas, while a secondary moisture cure mechanism completes curing in shadowed areas that UV light cannot reach. The coating reaches its optimum properties around 7 days after UV cure, and relative humidity above 50% supports this secondary cure stage.
Technical Specifications (Liquid Properties)
| Attribute | Detail |
|---|---|
| Composition | Urethane acrylate |
| Minimum solids content | 98% by weight |
| Viscosity at 25°C | 50 to 100 cP |
| Cure method | 395nm LED UV, minimum dose 3 J/cm² |
| Shelf life | 12 months at room temperature (from date of manufacture) |
Technical Specifications (Cured Coating Properties)
| Attribute | Detail |
|---|---|
| Recommended thickness | 30 to 130 microns |
| IPC guideline thickness | 25 to 125 microns |
| Time to optimum properties | 7 days after UV cure |
| Operating temperature | -65°C to 150°C |
| Thermal shock range (IPC-TM-650 2.6.7.1, Class 3) | -65°C to 125°C |
| Glass transition temperature (DSC) | 45°C |
| CTE below Tg (TMA) | 66.41 ppm/°C |
| CTE above Tg (TMA) | 192.65 ppm/°C |
| Modulus at 25°C (DMA) | 54.42 MPa |
| Dielectric withstand voltage (MIL-I-46058C) | Greater than 1500 V |
| Dielectric strength | 60 kV/mm |
| Volume resistivity | 1 x 10^14 ohms/cm |
| Surface insulation resistance (IPC J-STD-004 mod.) | 10.5 log ohms |
| Moisture insulation resistance (IPC CC830 Rev C) | Pass |
| Flammability (UL-94) | V-0 |
Why Choose HumiSeal UV80LED for Conformal Coating?
This coating suits production environments needing fast, tack-free cure without pre-heating, while its secondary moisture cure ensures shadowed areas under components still fully cure over time. Its UV fluorescence makes coating coverage easy to verify during inspection, and its compliance with IPC-CC-830, RoHS and UL 94V-0 supports use across demanding electronic assembly applications.
Application and Storage Conditions
| Attribute | Detail |
|---|---|
| Minimum application temperature | 16°C |
| Minimum application humidity | 50% relative humidity |
| Storage temperature | 5°C to 30°C |
| Recommended cleanup solvents | HumiSeal Thinner 521, Thinner 521EU or Thinner 73 |
