What are Polycarbonate Granules

PC 1803 is a high-viscosity transparent polycarbonate material designed for automotive lighting and precision injection molding. It is in the form of granules (polycarbonate granule) and is suitable for the production of thick-walled lampshades, complex light-guiding structures, and mold components with extremely high requirements for heat resistance and dimensional accuracy. It has the following features:

  ・The Vicat softening point is as high as 184°C, which can withstand long-term LED heat source radiation;

  ・Excellent dimensional stability and anti-UV aging ability;

  ・Supports high-precision injection molding and in-mold assembly to meet complex design requirements.

01｜Industry background: Material upgrade turning point in the evolution of automotive lighting

Automotive lamps, especially LED lighting systems, are undergoing a transformation from "appearance aesthetics" to "structural composite functions". Lampshades and light guide components are no longer simple covers, but must take into account:

  ・High optical performance (light transmittance, refraction control)

  ・Structural strength and heat resistance (LED chip heat load)

  ・Surface stability (UV resistance, scratch resistance, long-term transparency)

Under such multiple requirements, traditional general-purpose PC materials (such as low-viscosity grades) are difficult to cope with high temperature, thick wall and precision assembly scenarios. This also promotes high-performance polycarbonate granules such as PC 1803 to become the first choice for engineers in the design and material selection stage.

02｜Performance Details: Three-dimensional Balanced Solution of Heat, Light and Structure

🔸 Thermal Performance: High Temperature Resistance and No Deformation

Vicat Softening Point: 184°C

Adapt to continuous heating under LED light sources without the need for additional reinforcements or air duct structures.

Long-term thermal aging stability

By adding a thermal stabilization system, PC 1803 still maintains good optical properties and mechanical strength after aging continuously at 120°C for 1,000 hours.

🔸 Dimensional control: the core indicator of module assembly

Linear shrinkage: about 0.85%

Compared with standard general PC grades (shrinkage of about 0.9-1.2%), PC 1803 has better control capabilities and is suitable for precision structures such as snap-on positioning and sealing ring matching.

Low hygroscopicity design

Avoids dimensional changes or warping problems caused by water absorption after injection molding.

🔸 Optical stability: Coping with dual aging of UV and thermal oxygen

Embedded UV stabilizer system

Significantly reduces the yellowing index without sacrificing transparency.

High light transmittance + haze control

Applicable to optical-grade components such as fog lamp covers and light guides, while avoiding internal refraction dead angles.

🔸 Polycarbonate granule data sheet

Click here to download TDS for PC 1803

03｜Polycarbonate granule's role advantage in processing technology

As a high-viscosity polycarbonate granule, PC 1803 not only has superior material properties, but also has many advantages in the injection molding process:

🔧 Support thick-walled transparent parts molding

High viscosity: prevent melt sagging or bubbles even in wall thickness molding above 3mm;

Moderate cooling speed: ensure balanced stress release and avoid "halo" phenomenon;

🔧 Controllable demolding of complex structures

Fine flow path molding capability: adapt to multi-level optical structure and micro-rib design;

Optimize demolding behavior: non-stick mold, reduce mold maintenance frequency;

🔧 Strong surface treatment compatibility

Can be sprayed, coated or laser engraved, suitable for differentiated brand customization needs.

04｜Typical application scenarios and structural advantages

These parts generally use injection molding + post-processing process chain, which places high requirements on the dispersibility, stability and repeatability of polycarbonate granules, and PC 1803 meets this industrial-grade stable output demand.

05｜Differentiation positioning from other polycarbonate granule

06｜Juyuan advantages: precision material selection + export guarantee

Juyuan focuses on international polycarbonate granule trade and provides customers with a stable supply of polycarbonate granules, including engineering-grade polycarbonates such as PC 1803. The service advantages are as follows:

✅ Original genuine channels, quality consistency guarantee

✅ UL, RoHS, COA, TDS information can be provided

✅ Customizable packaging to meet export and high-frequency shipment needs

✅ Technical support and application suggestions are followed up simultaneously to improve material selection efficiency

Conclusion｜More heat-resistant and reliable polycarbonate granule solutions

Facing increasingly stringent automotive lighting system design requirements, PC 1803 polycarbonate granule provides design engineers and manufacturers with a material solution that takes into account thermal stability, structural reliability and processing friendliness. It is not only a granular raw material, but also a key carrier to meet the design challenges of a new generation of functional lamps.

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