Bectron® PT 4601: High-Performance Polyurethane Coating for PCB Protection
Bectron® PT 4601 by Elantas is a solvent-free, one-component polyurethane coating designed for precise application on printed circuit boards (PCBs). Cured through UV irradiation and moisture, this transparent thick film coating offers high viscosity and thixotropic properties for accurate application. The cured product is elastic, with flexibility at low temperatures (-40°C) and excellent adhesion to various substrates. Bectron® PT 4601 provides superior insulation properties, even after exposure to wet storage conditions, and meets ROHS requirements.
Key Features of Bectron® PT 4601:
- Rapid UV curing with moisture shadow-cure
- Temperature resistance from -40°C to +120°C
- Excellent flexibility at low temperatures (-40°C)
- Strong adhesion to most substrates
- Superior dielectric and insulation properties
- Solvent-free, thixotropic rheology
Applications:
Bectron® PT 4601 is a versatile, VOC-free conformal coating designed for electronics like surface mount devices and hybrids. It offers excellent electrical performance and protection against moisture, corrosion, and vibration. Its flow properties allow targeted application without affecting surrounding areas, making it ideal for sensitive electronic components.
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Table 1 – Properties of materials as supplied
| Property | Condition | Value | Unit |
| Colour | Blue | ||
| Viscosity | DIN 53019, D = 20s⁻¹, 23°C | 1700 ± 600 | mPa.s |
| Density | DIN EN ISO 2811-1, 20°C | 1.13 ± 0.05 | g/cm³ |
| Shelf Life | 5°C max | 6 | Months |
Table 2 – Curing Conditions
| Property | Condition | Value | Unit |
| UVA | 3000 ± 500 | mJ/cm² | |
| Curing Time | 5 ± 2 | Sec |
Table 3 – Thermal Properties of cured compound
| Property | Condition | Value | Unit |
| Glass transition temperature Tg | IEC 61006, penetration mode | -17 | °C |
| Linear expansion coefficient | Beck M56, above Tg | 2.0 x 10⁻⁴ | °K⁻¹ |
| Temperature Range | -40 to +120 | °C |
