• Item Name: LOCTITE® STYCAST UV 7996
• Manufacturer: Henkel
• Technologies: Urethane acrylate
• Color: Clear liquid
• Cure Type: UV and moisture cure
• Package Size: Contact to Techniq VN for details.
• Shelf Life: 12 months
1. Product Overview
LOCTITE STYCAST UV 7996 is a clear, single-component urethane acrylate conformal coating with positive fluorescence under UV light. It is solvent-free and designed to provide rugged protection against moisture and harsh chemicals. The product rapidly gels under UV exposure and completes curing via ambient moisture, ensuring reliable coverage even in shadowed areas. It complies with IPC-CC-830 requirements.
2. Applications
The coating is intended for printed circuit board (PCB) protection, offering excellent adhesion to solder masks, metallizations, components, and substrates. Its dual-cure mechanism makes it ideal for assemblies requiring robust insulation and chemical resistance in challenging environments.
3. Typical Properties
| Property | Uncured | Cured |
|---|---|---|
| Appearance | Clear liquid | Transparent protective coating |
| Fluorescence | Positive under UV light | — |
| Viscosity @ 25°C, mPa·s | 70 | — |
| Specific Gravity @ 25°C | 1.04 | — |
| Shelf life @ 25°C | 365 days | — |
| Cure mechanism | UV + moisture | Fully crosslinked |
| Recommended UVC cure | >75 mJ/cm², >3 sec @ >25 mW/cm² | — |
| Recommended UVA cure | >500 mJ/cm², >5 sec @ >100 mW/cm² | — |
| Moisture cure (shadowed areas) | — | 96–168 h @ 25°C depending on humidity |
| Hardness | — | 54 Shore D |
| Modulus | — | 426 N/mm² (61,770 psi) |
| Volume resistivity | — | 5.88 × 10¹⁴ ohm·cm |
| Dielectric strength | — | 27.9 kV/mm |
| Dielectric constant | — | 3.20 |
| Dissipation factor | — | 0.05 |
| Tensile strength | — | 14.7 N/mm² (2,132 psi) |
With its fast UV gelling, secondary moisture cure, and strong electrical and chemical resistance, LOCTITE STYCAST UV 7996 is a reliable conformal coating for advanced electronic assemblies.
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