Bectron® PK 4344 is a one-component resin system which cures to form a soft polyurethane duroplastic. It comprises a liquid polyol system with a dispersed solid encapsulated polyisocyanate and a pigment combination selected to provide controlled rheology including excellent thixotropic properties. Heating the resin releases the encapsulated polyiso- cyanate resulting in a polyaddition reaction to give a resistant duroplastic cured material.
In contrast to the usual 2 component resin systems Bectron® PK 4344 is ready to use and distinguished by excellent properties and especially good environ- mental compatibility.
FEATURES
- The cured material displays high elasticity and strength producing excellent temperature cycling behaviour within the range of -60°C to +125°C as well as resistance to vibrations. This ensures minimal crazing even in thick layered applications.
- Bectron® PK 4344 has excellent chemical resistance to a wide range of aggressive liquids common in automotive applications.
- Furthermore Bectron® PK 4344 has good adhesion to almost all materials used in the field of electronics. Even after several temperature cycles there is no loss of adhesion mechanical and electrical properties
- Satisfies ROHS Directive
Properties of component as supplied
Property | Condition | Value | Unit |
Viscosity, DIN 53019 | D=15 s-1, 23°C | 2.000 ± 500 | mPas |
Density, DIN 51757 | 23°C | 1,28 ± 0,01 | g/cm³ |
Shelf life | 23°C | 7 | months |
Pot-life, gel-time, curing conditions
Property | Value | Value | Unit |
Temperature | 80 | 90 | °C |
Gel-time | 5 ± 2 |
| min |
Curing | 65 ± 10 | 30 ± 5 | min |
Thermal properties in cured condition
Property | Condition | Value | Unit |
Coefficient of thermal expansion | -20°C to + 90°C | 200·10–6 | K-1 |
Thermal conductivity, DIN 52616 | 23°C | 0,18 ± 0,02 | W/mK |
Glow-wire test, DIN IEC 695, part 21 | 30 s | 850 | °C |