• Item Name: LOCTITE® STYCAST UV 7993
• Manufacturer: Henkel
• Technologies: Urethane
• Color: Translucent yellow
• Cure Type: Ultraviolet (UV) / Moisture cure
• Package Size: Contact to Techniq VN for details.
• Shelf Life: 12 months
1. Product Overview
LOCTITE STYCAST UV 7993 is a translucent yellow, single-component urethane conformal coating. It is UV-curable with a secondary room-temperature moisture cure for shadowed areas. This solvent-free material provides excellent moisture and chemical resistance, ensuring long-term protection of electronic assemblies under harsh operating conditions.
2. Applications
The product is designed for printed circuit board (PCB) protection. It is compatible with standard solder masks, no-clean fluxes, metallizations, substrates, and components, making it suitable for high-reliability electronics exposed to moisture and chemicals.
3. Typical Properties
| Property | Uncured | Cured |
|---|---|---|
| Appearance | Translucent yellow | Tough protective coating |
| Viscosity (Brookfield), mPa·s | 120 | — |
| Specific Gravity | 1.04 | — |
| Shelf life @ 25°C | 365 days | — |
| Cure mechanism | UV + moisture | Fully crosslinked |
| Recommended UVC cure (tack-free) | >300 mJ/cm², 5–10 sec @ >60 mW/cm² | — |
| Recommended UVA cure | >1,500 mJ/cm², 10–20 sec @ 150–300 mW/cm² | — |
| Moisture cure (shadowed areas) | — | 50–100 h @ 25°C depending on humidity |
| Hardness | — | 80 Shore A; 60 Shore D |
| Modulus | — | 1,150 N/mm² (166,650 psi) |
| Volume resistivity | — | 2.2 × 10¹⁶ ohm·cm |
| Dielectric strength | — | 50 kV/mm |
| Dielectric constant | — | 3.34 |
| Dissipation factor | — | 0.0131 |
| Tensile strength | — | 35 N/mm² (5,005 psi) |
With fast UV curing, strong secondary moisture curing, and superior electrical insulation, LOCTITE STYCAST UV 7993 is well suited for conformal coating in advanced electronics.
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