LOCTITE HHD 4042 is a dual-cure epoxy/acrylate adhesive designed for electronic component assembly. It initially cures with UV light and achieves maximum performance with a secondary heat cure.
| Property | Value |
|---|---|
| Uncured Properties | |
| Appearance | Light yellow paste |
| Viscosity @ 25°C (Spindle 52, 0.5 rpm) | 125,000 mPa·s (cP) |
| Specific Gravity @ 25°C | 1.63 |
| Pot Life @ 25°C (away from light) | 8 days |
| Curing Performance | |
| UV Wavelength Range | 300-500 nm |
| UV Tack-Free Time | <6 seconds |
| Heat Cure Schedule | 1 hour @ 120°C |
| Cured Properties | |
| Glass Transition Temperature (Tg) | 145°C |
| Coefficient of Thermal Expansion (α1) | 45.38×10⁻⁶ cm/cm/°C |
| Coefficient of Thermal Expansion (α2) | 138.73×10⁻⁶ cm/cm/°C |
| Volume Shrinkage on Cure | 3.1% |
| Mechanical Performance | |
| Lap Shear Strength (Steel) | 21 N/mm² (3,045 psi) |
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