3M High-Temperature Masking Liquid 2538UV

Product code: 2538UV

Manufacturer: 3M

Package size: 1 kg

Shelf Life: 24 months

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.


  • 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


  • 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

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