Applications

Bectron® PL 4122 E BLF FLZ – Transparent urethane/alkyd coating for PCB protection in harsh electronic environments

Item Name: Bectron® PL 4122 E BLF FLZ
Manufacturer: ELANTAS Beck GmbH
Technologies: Urethane-modified alkyd thin film varnish
Color: Transparent
Cure Type: Room temperature air cure (16 h) or accelerated oven cure (80°C, 0.5 h)
Package Size: Contact to Techniq VN for details.
Shelf Life: 6 months

1. Product Overview

Bectron® PL 4122 E BLF FLZ is a transparent polyurethane varnish based on urethane-modified alkyd chemistry. It offers low pin corrosion, fast curing (at room temperature or oven cure), and is lead-free, solvent-safe (no aromatic compounds), and RoHS compliant. It delivers superior thermal, dielectric, and chemical resistance while maintaining flexibility under thermal shock and PCB bending.

Available in three viscosity/solids grades for different application systems:

  • PL 4122-37 E BLF FLZ

  • PL 4122-40 E BLF FLZ

  • PL 4122-45 E BLF FLZ


2. Applications

  • Protective coating for PCBs in aggressive environments: automotive, marine navigation, industrial, corrosive gas.

  • Suitable for hybrids, SMDs, and discrete components.

  • Designed for safety-critical electronic systems.

  • Maintains dielectric and adhesion performance even under temperature cycling (-40 to +125 °C, >750 cycles).

  • Compatible with robotic and automated coating systems (spray, dip, select coat), as well as manual methods.

3. Typical Properties

Table 1 – As Supplied (Unmixed)

Property Condition Value Unit
Non-volatile content (Solids, ISO 3251) 130°C, 2h 37 ±1 (PL 4122-37) %
40 ±2 (PL 4122-40) %
45 ±1 (PL 4122-45) %
Viscosity (DIN EN ISO 2431) 23°C 40 ±3 s (≈50 mPa·s, PL 4122-37) s / mPa·s
65 ±5 s (≈80 mPa·s, PL 4122-40) s / mPa·s
40 ±3 s (≈240 mPa·s, PL 4122-45, 6 mm cup) s / mPa·s
Density (DIN EN ISO 2811-2) 23°C 0.86 ±0.01 (PL 4122-37) g/cm³
0.87 ±0.01 (PL 4122-40) g/cm³
0.88 ±0.01 (PL 4122-45) g/cm³
Shelf life 23°C 6 months
Curing time (air cure) 23°C Dust dry: 0.25 h; Touch dry: 1 h; Cured: 16 h h
Curing time (oven) 80°C 0.5 h

Table 2 – Thermal Properties (Cured)

Property Condition Value Unit
Temperature resistance (IEC 60216) 134 °C
Flammability (UL 94, File E211569) V0

Table 3 – Mechanical Properties (Cured)

Property Condition Value Unit
Mandrel bend test (IEC 60464-2) 3 mm, 0.06 mm film >180 °
Cross cut test (DIN EN ISO 2409) GT 0–1

Table 4 – Dielectric Properties (Cured)

Property Condition Value Unit
Permittivity (IEC 60250) 23°C, 10 kHz 3.5
Dielectric dissipation factor (IEC 60250) 23°C, 10 kHz 0.023
Dielectric strength (IEC 60464-2) 23°C 112 kV/mm
After 23h water immersion 108 kV/mm
Volume resistivity (IEC 60464-2) 23°C 1 × 10¹⁵ Ω·cm
Tracking resistance (IEC 60112) 600 CTI

Table 5 – Chemical Properties (Cured)

Property Condition Value Unit
Water absorption (ISO 62) 23°C, 24h 1.5 %
100°C, 0.5h 2.5 %

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