Home » Products » Bectron® PK 4340 – Polyurethane resin coating for vibration protection of delicate PCB and SMD components

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Bectron® PK 4340 – Polyurethane resin coating for vibration protection of delicate PCB and SMD components

• Item Name: Bectron® PK 4340
• Manufacturer: ELANTAS Beck GmbH
• Technologies: One-component polyurethane resin system (thermal cure, thixotropic properties)
• Color: Not specified
• Cure Type: Thermal cure (80°C for 60 min, 90°C for 30 min, <1 min with IR)
• Package Size: Contact to Techniq VN for details.
• Shelf Life: 6 months

1. Product Overview

Bectron® PK 4340 is a one-component polyurethane resin system designed for electronic protection. It cures into a soft, elastic duroplastic with excellent thixotropic behavior, vibration resistance, and environmental compatibility. Unlike conventional two-component resins, it is ready-to-use, provides strong adhesion to various electronic substrates, and is RoHS compliant.

2. Applications

Vibration protection for delicate electronic components.
Partial or selective coating of SMDs, PCB assemblies, and ceramic substrates.
Dam-and-fill applications: can be used as a dam for higher-viscosity barriers around areas later filled with lower-viscosity resins (e.g., PK 4342).
Particularly useful in automotive electronics due to strong chemical and thermal resistance.

3. Typical Properties

Table 1 – As Supplied (Unmixed)

Property	Condition	Value	Unit
Viscosity (DIN 53019)	D=15 s⁻¹, 23°C	9,500 ± 1,500	mPa·s
Density (DIN EN ISO 2811-2)	23°C	1.23 ± 0.02	g/cm³
Shelf life	23°C	6	months

Table 2 – Processing & Cure

Property	Condition	Value	Unit
Gel-time	80°C	5 ± 2	min
Curing time	80°C	65 ± 5	min
Curing time	90°C	30 ± 5	min

Table 3 – Thermal Properties (Cured)

Property	Condition	Value	Unit
Coefficient of thermal expansion (Beck Test M 56)	-20°C to +90°C	200 × 10⁻⁶	K⁻¹
Thermal conductivity (DIN 52616)	23°C	0.18 ± 0.02	W/m·K

Table 4 – Mechanical Properties (Cured)

Property	Condition	Value	Unit
Glass transition temperature (IEC 61006)	–	-50	°C
Shore hardness (ISO 868)	23°C	70 ± 10	Shore A

Table 5 – Dielectric Properties (Cured)

Property	Condition	Value	Unit
Volume resistivity (IEC 60455-2)	Initial	10¹³	Ω·cm
Volume resistivity (IEC 60455-2)	After 7 days water immersion	10¹¹	Ω·cm
Dielectric strength (IEC 60455-2)	23°C	22	kV/mm
Tracking resistance (IEC 60112, Solution B)	CTI	600	–

Table 6 – Chemical Properties (Cured)

Property	Condition	Value	Unit
Water absorption (ISO 62, Method 1)	24h / 23°C	131	mg

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