Product description
Bectron® PK 4332 is a one-component resin system which cures to form a very soft polyurethane duroplastic. It comprises a liquid polyol system with a dis- persed solid encapsulated polyisocyanate and a pigment combination selected to provide controlled rheology including excellent thixotropic properties. Heating the resin releases the encapsulated polyisocyanate resulting in a polyaddition reaction to give a resistant duroplastic cured material.
In contrast to the usual 2 component resin systems Bectron® PK 4332 is ready to use and distinguished by excellent properties and especially good environ- mental compatibility.
Application of Bectron® PK 4332
- The cured Bectron® PK 4332 is a very soft duroplastic suitable for chemical, shock and vibration protection of delicate components.
- Bectron® PK 4332 is therefore most suited for the partial or selective coating of SMD and other compo- nents groups on printed circuit boards and ceramic substrates. It is also widely used as a casting resin for electronic components and sensors, including ultra- sonic types
Properties of Bectron® PK 4332 in cured condition
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 4332 has excellent chemical resistance to a wide range of aggressive liquids common in automotive applications. Bectron® PK 4332 has good adhesion on 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.
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About Prostech
Prostech offers specialty materials (adhesives, tapes, thermal interface materials, insulating materials, sealants, PCB protection materials, …) along with manufacturing solutions. We proudly serve a wide range of industries and are an authorized distributor for leading global manufacturers of industrial materials and equipment. Our product range is designed to deliver customized solutions that address each customer’s unique needs.
With years of experience and a successful project history, we are confident in our ability to provide comprehensive material solutions. These solutions effectively tackle the challenges manufacturers face. To explore our full product catalog, simply click here. Our dedicated team is ready to assist with:
- Provide quotation, sample, TDS/MSDS, and technical consultation
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- Offering expert advice on suitable equipment and automation processes
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Properties of component as supplied
Property | Condition | Value | Unit |
Viscosity, DIN 53019 | D=15 s-1, 23°C | 5.500 ± 1.000 | mPas |
Density, DIN EN ISO 2811-2 | 23°C | 1,05 ± 0,03 | g/cm³ |
Shelf life | 23°C | 7 | months |
Thermal properties of cured compound
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/mK |
Mechanical properties of cured compound
Property | Condition | Value | Unit |
Glass transition temperature, IEC 61006 | – | -50 | °C |
Shore hardness, ISO 868 | 23°C | 35 ± 10 | Shore A |
Here are BECTRON® PK-Series (1 Component, heat-curing)
| Product Code | Colour | Viscosity [mPas] | Max Temp. [ºC/20,000 h] | Hardness [Shore] | Cure Speed [min] @ +90 ºC | Thermal Conductivity [W/mK] |
| PK 4332 | Black | 5,250 | +125 ºC | 35 A | 60 | 0.2 |
| PK 4340 | Black | 9,500 | +125 ºC | 70 A | 30 | 0.3 |
| PK 4342 | Black | 5,000 | +125 ºC | 70 A | 30 | 0.3 |
| PK 4344 | Black | 2,000 | +125 ºC | 70 A | 30 | 0.3 |
| PK 4351 | Black | 6,250 | +125 ºC | 30 D | 30 | 0.3 |
| PK 4353 | Black | 3,750 | +125 ºC | 30 D | 30 | 0.3 |
| PK 4364B | Blue | 5,000 | +125 ºC | 40 D | 30 | 0.3 |
| PK 5532 | Black | 5,500 | +130 ºC | 35 A | 30 | 0.2 |
| PK 5542 | Black | 5,000 | +130 ºC | 70 A | 30 | 0.4 |
| PK 5553 | Black | 3,500 | +130 ºC | 30 D | 30 | 0.3 |
