What is Ultradur B4300G6

With the trend towards lighter weight and high reliability in electrical connectors, automotive components, and home appliance structures, material selection is no longer just a technical issue of R&D, but also a matter of factory stability and market competitiveness. If you are looking for a glass-fibre-reinforced PBT material that is thermally stable, has excellent strength, and is highly efficient to process, Ultradur B4300G6 (PBT B4300G6) will be the choice you should pay attention to.

As a professional PBT raw material supplier, we not only provide stock delivery, technical support, and original data, but also assist you in dealing with core issues such as international certification, product selection, and long-term cost optimisation.

01 | Faced with five design challenges, how does Ultradur B4300G6 deal with them?

Difficulty in controlling deformation of complex structural parts?

Most precision housings and functional brackets often suffer from dimensional deviation due to thermal deformation and stress concentration during the injection moulding process. Ultradur B4300G6 adopts a 30% glass fibre reinforcement system, which maintains light weight while providing a flexural modulus of up to 6,800 MPa, and achieves an extremely low shrinkage rate of only 0.3–0.7%, making it easy to cope with the demands of high-precision moulding.

Electrical safety risk due to long-term exposure to electricity?

Materials used in high-voltage or sensitive control systems must have excellent insulating properties. With a volume resistance of 1E16 Ω·cm and an insulation strength of 100 kV/mm, the material works stably even in hot and humid environments, helping customers meet strict UL and IEC standards.

Structural strength and flexibility?

Ultradur B4300G6 breaks through the traditional ‘brittle’ impression of glass-fibre-reinforced plastics with a cantilever beam impact strength of 5.1 kJ/m², combining rigidity and impact toughness. Even when subjected to dynamic loads or snap-on designs, it can withstand repeated stresses without cracking.

High temperature loads and poor deformation control?

Under a load of 1.8 MPa, the heat distortion temperature of Ultradur B4300G6 is as high as 215°C, and the Vicat softening point reaches 220°C, which can effectively avoid structural deformation or instability at high temperatures. Whether it's LED modules, motor end caps, or PCB brackets close to heat sources, its thermal stability ensures dimensional and structural reliability for long-term use.

Difficulty in thin-wall moulding? Poor dimensional consistency?

With a melt index of 14 g/10 min, Ultradur B4300G6 has good fluidity and is suitable for injection moulding designs with long processes, fine structures, and complex geometries. Its low shrinkage rate of 0.3–0.7% helps to shorten the mould trial time and reduce the deformation error, providing reliable support for efficient mass production and multi-cavity mould applications.

02 | Application Scenarios: What practical problems is B4300G6 solving?

Automotive industry: Used for sensor shells, plug bases, and engine compartment internal structural parts, which can still maintain small deformation and stable structure in the face of high temperature and oil environments.

Electrical and electronic: For power module shells, printed circuit board brackets, high-voltage relay frames, and other occasions requiring high insulation.

Household appliances: Such as iron bases, socket support boards, hot air gun components, etc., in high-temperature and high-humidity environments, without affecting safety performance.

Industrial equipment: Precision machinery shells, control unit modules, electrical distribution boxes, and other occasions, taking into account dimensional accuracy and processing efficiency.

03 | Ultradur B4300G6 Material Properties at a Glance

04 | Why choose PBT B4300G6 instead of PA66 or other PBT materials?

Higher moulding efficiency: Melt index 14, suitable for rapid prototyping of thin-walled complex parts.

More stable dimensions: Low water absorption and low coefficient of thermal expansion, more durable and stable product geometry.

Better electrical performance: Suitable for components that are extremely sensitive to dielectric strength and leakage current.

05 | Why choose us? More than materials, more than solutions

We don't just supply materials, we understand the application logic behind them. Ultradur B4300G6's traceability, original certifications, and batch stability are key factors in guaranteeing the long-term reliability of your products. As a long-term supplier to many end-user factories, we offer:

   ✔ Original factory shipment, stable and traceable quality

   ✔ Multi-location warehousing, flexible and fast lead time

   ✔ Free samples + technical selection support

   ✔ Assistance in connecting with mould makers/foundries for process adaptation

06 | Get in touch with us

Looking for a material that can replace PA66, improve thermal stability and electrical safety?

Contact us for the PBT B4300G6 datasheet and samples.

Let us help you take your products to the next level, before they leave the factory.

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