3M™ High-Temperature Masking Liquid 2538UV is a UV fluorescing olefin hybrid adhesive that is specially formulated to offer excellent high-temperature resistance and low slump during processing. This specially formulated UV hot melt adhesive provides a clearly detectable means for product location and removes cleanly from various electronic substrates by peeling (even after 10 min @ 260°C (500°F)). The non-silicone formulation reduces the potential for silicone contamination which can interfere with subsequent bonding or conformal coating processes. This high-temperature resistance adhesive also possesses excellent chemical resistance and should be considered for demanding chemical masking applications.
FEATURES:
- Excellent conformability upon dispensing
- High-temperature slump resistance
- Good wet out on various substrates such as FR4, metals and glass
- Good chemical resistance to conformal coatings, acids and bases ingression
- Fast process time
- Clean removal
- Stable dielectric properties
- Silicone free
- UV detectable
APPLICATIONS:
- Protection of sensitive areas and component on printed circuit boards during conformal coating processes
- Masking and sealing of electronic components
| Adhesive | Olefin Hybrid |
| Color | Translucent |
| Viscosity at 150°C | 240 Pa·s |
| Excitation Wavelength | ~380 nm |
| Hardness (Shore A) | 20 |
| Tensile Elongation | >700% |
| Glass Transition Temperature | -51°C |
| Surface Resistivity | 1.6E14 ohm/sq |
| Volume Resistivity | >1.0E16 ohm-cm |
| Dielectric Constant (9 – 25 GHz) | 2.3 |
| Breakdown Voltage | 38 KV/mm |
