Applications

Bectron® PT 4842 – Low-viscosity moisture-cure polyurethane for PCB protection, sealing, and mechanical stability

Item Name: Bectron® PT 4842
Manufacturer: ELANTAS Europe
• Technologies: 1-component moisture-cure polyurethane, thixotropic, flexible, low solvent content
Color: Clear transparent
Cure Type: Ambient moisture cure
Package Size: Contact to Techniq VN for details.
Shelf Life: 16 weeks

1. Product Overview

Bectron® PT 4842 is a one-component, low-viscosity polyurethane designed for thick film coating applications. It cures rapidly through atmospheric moisture to form a soft, flexible protective layer. The product offers strong adhesion, low shrinkage, solvent resistance, and excellent dielectric properties, even after water immersion. It is RoHS-compliant and UV-detectable for inspection.


2. Applications

  • Protective coating for PCBs against moisture and contamination

  • Securing large components against mechanical shock and vibration

  • Thick film coating on large PCB areas or selective components/contacts

  • Sealing open PCB connections

  • Suitable for low-temperature environments (down to –40 °C)

3. Typical Properties

As Supplied (Uncured)

Property Condition Value Unit
Colour Clear transparent
Viscosity DIN 53019, 23°C, D=22.4 s⁻¹ 3700 ± 900 mPa·s
Specific Gravity DIN EN ISO 2811-1, 23°C 1.12 ± 0.05 g/cm³
Shelf Life 5–10°C 16 weeks

Cured – Thermal Properties

Property Condition Value Unit
Temperature Range –40 to +120 °C

Cured – Mechanical Properties

Property Condition Value Unit
Specific Gravity DIN 16945, 23°C 1.12 ± 0.05 g/cm³
Hardness ISO 868, 23°C 45 ± 10 Shore A
Elongation at Break DIN 53455, 23°C 270 %

Cured – Dielectric Properties

Property Condition Value Unit
Volume Resistivity IEC 60464-2, 23°C 1.3 × 10¹³ Ω·cm
Volume Resistivity (after water immersion, 7d) 23°C 3.5 × 10¹² Ω·cm
Surface Resistivity VDE 0303-3, 23°C 5 × 10¹² Ω
Surface Resistivity (after water immersion, 7d) 23°C 1 × 10¹² Ω
Relative Permittivity IEC 60250, 23°C 3.5
Dielectric Loss Factor (tan δ) IEC 60250, 23°C 0.03
Dielectric Strength IEC 60464-2, 23°C 20 kV/mm
Tracking Resistance IEC 60112 600 CTI

Cured – Chemical Properties

Property Condition Value Unit
Water Absorption ISO 62, 24h at 23°C 0.2 %

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