Glass Fiber Reinforced PC

Glass Fiber Reinforced PC is a polycarbonate compound containing short glass fibers to increase stiffness, tensile and flexural modulus, heat resistance, and dimensional stability. Compared with unreinforced PC, reinforced grades generally have lower molding shrinkage and better resistance to deformation under load. As fiber content increases, impact performance and flow behavior can change, so the appropriate grade depends on the required balance of rigidity, toughness, heat resistance, and processing performance.

Nianjing is a plastic raw material supplier and trading company in China, based in China Plastics City, Yuyao. The company sources virgin polycarbonate grades from producers including SABIC LEXAN™, Teijin, Samyang, and domestic manufacturers such as Shanghai Yuebei. Available options include 10%, 20%, and 30% glass-fiber grades, flame-retardant reinforced grades, and selected carbon-fiber reinforced PC grades, subject to current producer and supply conditions.

Reinforcement Levels and Material Options

Glass-fiber content is one of the main factors affecting the balance between rigidity, toughness, flow, and dimensional stability.

These percentages represent commonly sourced options rather than universal formulations. Mechanical, thermal, flow, and shrinkage properties vary by producer and grade.

Reference Properties Across Selected Grades

The figures below provide general comparison data for selected reinforced polycarbonate grades. They are not guaranteed specifications for every 10%, 20%, or 30% formulation.

Actual values should be confirmed against the current TDS for the specific material being sourced.

How Reinforcement Changes PC Performance

The main purpose of glass-fiber reinforcement is to increase rigidity and dimensional performance. It does not improve every property at the same time.

For precision-molded parts, these trade-offs should be considered together rather than selecting the highest fiber content simply for maximum stiffness.

Available Grades and Producers

Nianjing can check specified producers and grades according to material requirements, quantity, destination, and current availability.

The descriptions are provided for sourcing reference. Current mechanical properties, flame classifications, processing conditions, and availability should be verified against the applicable manufacturer's documentation.

Applications

Automotive Components

Reinforced PC can be considered for brackets, housings, lamp-related components, electrical parts, and other non-structural automotive components where rigidity, heat resistance, and dimensional stability are required.

Electrical and Electronic Parts

Switch housings, relay enclosures, connectors, and electrical housings may use reinforced grades. Where fire performance is required, a specific flame-retardant grade should be selected and its UL 94 classification verified at the applicable thickness.

Industrial Components

Machine housings, equipment components, camera bodies, brackets, and other molded parts can benefit from increased rigidity and reduced molding shrinkage.

New Energy Components

Selected reinforced and flame-retardant grades can be considered for electrical and structural components in EV and energy-storage systems. The appropriate material depends on temperature, mechanical loading, flammability, electrical, and application-specific requirements.

Processing Tips

Glass fiber reinforced PC is mainly processed by injection molding. Polycarbonate is sensitive to moisture and should be properly dried before processing. Glass fibers can also affect melt flow and create fiber orientation, which may influence shrinkage, warpage, and dimensional stability.

Common Processing Conditions

These figures are general starting references rather than universal processing specifications. The processing guide for the selected producer and grade should take priority.

Factors Affecting Part Quality

Glass fibers tend to align with the melt flow direction during injection molding. This can create differences in shrinkage and mechanical properties between the flow and transverse directions. Gate location, flow length, wall thickness, packing pressure, and cooling conditions can therefore influence dimensional stability and part warpage.

Proper drying is also important for reinforced PC materials. Insufficient drying may lead to silver streaks, bubbles, hydrolytic degradation, and reduced mechanical performance. Excessive melt temperature or prolonged residence time may affect color, surface appearance, and material properties.

Selecting the Appropriate Grade

For customers sourcing Glass Fiber Reinforced PC, fiber percentage is only one part of the selection process.

Rigidity and dimensional stability: Higher glass-fiber loading generally increases modulus and reduces molding shrinkage, making higher-loading grades suitable for rigid or precision-molded components.

Impact performance: If the part experiences impact or repeated mechanical loading, a lower fiber loading or specifically toughened grade may provide a better balance.

Temperature resistance: HDT, Vicat softening temperature, and actual operating temperature should be compared with the selected grade's specification.

Flame performance: Electrical and electronic applications may require a defined UL 94 classification at a specified test thickness.

Surface requirements: Fiber orientation can affect surface appearance, especially at higher reinforcement levels.

Documentation and Supply

Nianjing sources material according to the confirmed manufacturer, grade, specification, quantity, and destination. Producer documentation such as a TDS or batch COA can be requested where applicable.

For procurement, customers can provide:

If the exact grade has not been selected, the application, required stiffness, operating temperature, impact requirement, wall thickness, and molding process can be used to identify suitable sourcing options.

FAQ

What does glass fiber do to polycarbonate?

It mainly increases stiffness, modulus, heat deflection performance, and dimensional stability while reducing molding shrinkage. Higher fiber loading can also reduce impact toughness and affect flow and surface appearance.

Is 30% glass fiber always better than 10%?

No. Higher loading can provide greater rigidity and dimensional stability, but it may reduce toughness and make processing more demanding. The appropriate level depends on the part requirements.

Does glass fiber affect molding shrinkage?

Yes. Reinforcement generally reduces molding shrinkage, but fiber orientation can create directional differences. Mold design and processing conditions therefore affect the final dimensions.

Can reinforced PC be used for electrical housings?

Yes, selected grades are used for electrical and electronic housings. If a flame classification is required, the UL 94 result and test thickness of the exact grade should be confirmed.

What is the difference between glass-fiber and carbon-fiber reinforced PC?

Glass fiber is widely used to increase stiffness and dimensional stability. Carbon fiber can provide high stiffness-to-weight performance and may be selected when weight reduction or specific mechanical properties are important.

Can Nianjing source a specific reinforced PC grade?

Yes. Customers can provide the manufacturer, grade, fiber content, required properties, quantity, and destination. Nianjing can check the corresponding sourcing and supply conditions.

Related PC Materials

General-Purpose PC

Flame Retardant PC

Optical PC

PC/ABS