GBM Mold Technology Co., Ltd.
GBM Mold Technology Co., Ltd.

Polycarbonate Injection Molding Services for Custom PC Parts

China-based polycarbonate injection molding supplier for custom PC housings, transparent covers, PC/ABS enclosures, optical-grade parts and impact-resistant components. GBM supports DFM review, PC mold tooling, T1 sample validation, CMM inspection and export-ready production for overseas OEM projects.

  • Custom PC injection mold tooling for prototypes, low-volume and production projects
  • DFM support for PC flow, gate design, wall thickness, internal stress and warpage control
  • PC, PC/ABS, transparent PC, optical-grade PC and PC + TPU molding support
  • T1 samples, mold trial videos, CMM reports and sample QC reports available
  • Export-ready mold delivery with drawings, spare parts list, packing photos and maintenance notes
Send Drawings on WhatsApp
PC Injection Molding Workshop

Quick Facts

Material: Polycarbonate / PC
Best for: impact-resistant, transparent, heat-resistant and dimensionally stable parts
Services: PC mold tooling, injection molding, T1 trial, QC reports
Related materials: PC/ABS, PMMA, ABS, PBT, TPU, TPE
Quote data needed: drawings, material grade, annual quantity, surface finish, tolerance

Polycarbonate Injection Molding Services

Comprehensive custom polycarbonate injection molding solutions tailored to your production scale and requirements.

Service Type Best For GBM Support
Prototype PC Injection Molding Design validation, fit test, transparent sample check DFM, single-cavity mold, T1 sample review
Low-Volume PC Molding Pilot run, market testing, small batch parts Aluminum/steel tooling option, QC report
Production PC Molding Stable repeated parts and assembly components Multi-cavity mold, process validation, packaging
PC Mold Tooling + Parts Production Buyers needing one supplier from mold to molded parts Mold design, machining, injection trial, shipment
Export PC Mold Tooling Only Overseas factories needing mold delivery Drawings, spare parts, trial video, packing photos

Need PC mold tooling instead of molded parts production?

For buyers who only need export-ready PC injection molds, please visit our Polycarbonate Injection Mold Tooling page for mold steel, surface finish, mold life and tooling standard options.

PC Injection Molding at a Glance

PC Resin

What It Is

Polycarbonate injection molding uses PC resin and precision molds to produce strong, durable, and dimensionally stable plastic parts.

PC Mold

Why Buyers Use PC

PC is selected for impact resistance, heat resistance, transparency, electrical insulation, and dimensional stability.

PC Parts

What GBM Provides

GBM provides PC mold tooling, injection molding, DFM review, T1 samples, CMM inspection, and export mold support.

Process Overview

What Is Polycarbonate (PC) Injection Molding?

Polycarbonate injection molding is a manufacturing process that melts PC resin and injects it into a precision mold to produce strong, transparent, impact-resistant, and dimensionally stable plastic parts. PC is often used for housings, covers, transparent components, electronic enclosures, automotive parts, and industrial components.

PC Part Detail
Precision PC Molding

Compared with common plastics, PC requires more careful control of resin drying, mold temperature, gate design, wall thickness, cooling, and internal stress. Poor mold design or processing may lead to flow marks, bubbles, sink marks, warpage, or cracking.

GBM supports PC injection molding projects with DFM review, PC mold tooling, T1 mold trial, CMM inspection, sample QC reports, and export-ready mold delivery.

Send your 2D/3D drawings, material grade, quantity, and tolerance requirements for evaluation.

PC Material Grade Selection for Injection Molded Parts

Selecting the right polycarbonate grade is critical for part performance and moldability.

General-Purpose PC

Suitable Parts:

Housings, covers, protective parts

Design Concern:

Gate size, drying, stress control

Transparent PC

Suitable Parts:

Clear covers, guards, display windows

Design Concern:

Flow marks, bubbles, black spots

Optical-Grade PC

Suitable Parts:

Lenses, light guides, optical covers

Design Concern:

Polishing, venting, low stress molding

Flame-Retardant PC

Suitable Parts:

Electrical housings, device enclosures

Design Concern:

UL grade, wall thickness, flow length

PC/ABS

Suitable Parts:

Electronics enclosures, automotive interiors

Design Concern:

Better processability, lower stress risk

Glass-Filled PC

Suitable Parts:

Structural parts, brackets

Design Concern:

Fiber orientation, warpage, tool wear

PC Molding Processing Parameters & Temperature Control

Precise temperature and pressure control is mandatory to avoid internal stress and visual defects in polycarbonate parts.

Parameter Typical Reference Range Why It Matters
Resin Drying 120°C, about 3–4 hours, final setting by resin datasheet Reduces moisture marks, bubbles and material degradation
Melt Temperature 280–320°C Supports filling, surface finish and material flow
Mold Temperature 80–120°C Helps reduce internal stress and improves surface quality
Gate & Runner Temp Based on hot runner/cold runner design Prevents flow hesitation, cold slug and visible gate marks
Packing Pressure / Time Based on wall thickness and gate freeze time Controls sink marks, voids and dimensions
Cooling Balance Based on part thickness and mold layout Reduces warpage and cycle instability
Note: Typical reference range only. Final parameters depend on resin grade, part thickness, gate design, mold temperature control and T1 trial results.

Design Guidelines for Polycarbonate Injection Molded Parts

Best practices for designing parts specifically for polycarbonate injection molding to ensure strength and cosmetics.

Design Item Recommendation Reason
Wall Thickness Keep wall thickness as uniform as possible Reduces sink marks, stress and warpage
Ribs & Bosses Avoid overly thick ribs and sharp transitions Reduces voids and cracking risk
Gate Location Place gate away from visible optical surfaces when possible Reduces flow marks and gate stress
Venting Add venting near flow ends and trapped-air areas Reduces burn marks, bubbles and short shots
Draft Angle Add enough draft for textured or polished surfaces Prevents scratches and sticking
Radii Use smooth transitions around corners Reduces stress concentration
Transparent PC Review weld lines, polishing, drying and flow path carefully Improves clarity and cosmetic acceptance
PC/ABS Alternative Consider PC/ABS when full PC is too difficult or too costly Improves processability and reduces stress risk

Why Polycarbonate Is Used for Injection Molded Parts

Comprehensive tooling and molding solutions tailored to your specific polycarbonate material needs.

High Impact Resistance

High Impact Resistance

PC is suitable for protective housings, covers, and structural plastic components that require toughness.

Transparency

Transparency

PC can be used for transparent covers, windows, guards, and light guide components.

Heat Resistance

Heat Resistance

PC is suitable for applications requiring better heat resistance than many commodity plastics.

Dimensional Stability

Dimensional Stability

PC can maintain stable dimensions when mold temperature, cooling, and shrinkage are properly controlled.

Electrical Insulation

Electrical Insulation

PC and PC/ABS are commonly used for electrical housings, connector parts, and electronic enclosures.

Surface Finish

Surface Finish

PC can achieve good cosmetic surfaces, but gate design, polishing, drying, and process control are important.

Typical Applications of PC Injection Molded Parts

Electronics

Electronics & Electrical

Automotive

Automotive

Medical

Medical Devices

Industrial

Industrial Equip

Transparent

Transparent Parts

Start Your Project Evaluation

Send your 2D/3D drawings, material grade, quantity, and tolerance requirements for evaluation.

Get a Free Evaluation
Annie@gbminjection.com
+86 13632611848

Common PC Injection Molding Defects and Remedies

Polycarbonate is notoriously difficult to mold due to its high viscosity and tendency for internal stress. Here is how we solve common defects.

Defect Common Cause GBM Review Point
Silver Streaks Moisture, material overheating, air trap Resin drying, barrel temperature, venting
Bubbles / Voids Moisture, thick walls, poor packing Drying, wall thickness, packing pressure
Flow Marks Low mold temperature, poor gate position, long flow path Gate design, mold temperature, flow length
Burn Marks Trapped air or high shear Venting, injection speed, gate size
Sink Marks Thick ribs, bosses or uneven walls Rib/boss redesign, packing, cooling
Warpage Uneven wall, unbalanced cooling, fiber orientation Cooling layout, gate location, DFM correction
Cracking After Assembly Internal stress or sharp corners Mold temperature, radii, packing, stress review
Black Spots / Yellowing Degradation, poor purging, overheating Barrel temperature, residence time, material handling
Gate Blush Gate shear or wrong gate size Gate geometry, speed, temperature
Weld Lines Multiple flow fronts, poor venting Gate layout, venting, flow simulation if needed

Why Choose GBM for PC Injection Molding

DFM Before Mold Cutting

We review wall thickness, draft angle, gate location, ribs, bosses, undercuts, and possible stress areas before mold manufacturing.

PC Mold Tooling Experience

GBM supports PC molds for housings, covers, transparent parts, PC/ABS enclosures, and precision components.

T1 Samples & Mold Trial Support

We provide T1 samples, mold trial pictures, trial videos, and engineering feedback before mold approval.

CMM-Based Quality Control

CMM reports, sample QC reports, FAI, and CPK reports are available based on project requirements.

Export-Ready Mold Delivery

We can provide mold drawings, spare parts lists, maintenance notes, packing photos, and secure export packaging.

DFM Engineering CMM Inspection T1 Samples Export Mold

PC vs ABS vs PC/ABS vs PMMA

Material Main Strength Best For
PC Impact resistance, heat resistance, transparency Durable parts, transparent covers, protective housings
ABS Easy molding, lower cost, good appearance General housings and consumer parts
PC/ABS Balance of toughness and processability Electronics enclosures, automotive interior parts
PMMA Excellent optical clarity Transparent covers, lenses, display parts
PC Material ABS Material PC/ABS Material PMMA Material

If you are not sure whether PC, PC/ABS, ABS, or PMMA is better for your part, GBM can review your drawings, application, and quality requirements before quotation.

How to Choose a Polycarbonate Injection Molding Supplier

Selecting the right manufacturing partner ensures high-quality parts, reduced defect rates, and a smoother production process.

Buyer Checkpoint Why It Matters for PC Parts What GBM Provides
PC Material Experience PC has high viscosity and stress risk PC, PC/ABS, transparent PC, optical-grade PC review
DFM Before Tooling PC defects often start from wall, gate and flow design DFM review before mold cutting
Mold Temperature Control PC needs stable mold temperature for stress and surface Cooling and temperature review during mold design
T1 Trial Feedback PC issues need trial correction T1 samples, photos, videos, engineering feedback
QC Documentation OEM buyers need dimensional and visual proof CMM, sample QC, FAI/CPK on request
Export Communication Overseas buyers need remote confirmation Drawings, packing photos, WhatsApp/email support

Send your PC part drawing for DFM review before choosing a molding supplier.

Quality Control for PC Injection Molded Parts

Rigorous Inspection Process

  • Incoming material and steel checking
  • Mold component inspection during machining
  • Mold assembly and water testing
  • T1 sample inspection
  • CMM dimension inspection
  • Final fit / form / function review

Reports Available

Sample QC report Full CMM dimension report Mold trial report Mold trial pictures/videos FAI / CPK reports (on request) Packing photos
CMM Machine Hardness Tester
Injection Machine Trial

T1 Mold Trial for PC Projects

For PC injection molding, T1 trial helps verify flow marks, bubbles, sink marks, warpage, gate marks, stress risk, dimensions, and assembly performance before mold approval.

GBM Checks

  • • Filling status & Flow marks
  • • Bubbles, voids, and Sink marks
  • • Warpage & Gate marks
  • • Dimensions & Appearance
  • • Assembly fit

Buyer Receives

  • • Physical T1 samples
  • • Trial pictures & video
  • • Sample QC report
  • • CMM report (if required)
  • • Engineering feedback

Export-Ready PC Injection Mold Packaging

Final mold cleaning Anti-rust protection Water line check Ejection check Wooden case packing Spare parts list Maintenance notes
Anti-rust Mold Wooden Case Spare Parts

Need an export-ready PC mold?

Send us your machine data and mold standard requirements for a precise evaluation.

Related PC Molding Solutions

PC/ABS Injection Molding
Optical-Grade PC Molds
Transparent PC Molding
Impact-Resistant Housings
Electronics Enclosures
PC Two-Shot Molding
PC Molding Defects Guide
PC Temperature Guide

FAQ About Polycarbonate Injection Molding

What is polycarbonate injection molding?
Polycarbonate (PC) injection molding is a highly precise manufacturing process that injects molten polycarbonate resin into a custom-machined steel mold. It is widely used to produce durable, impact-resistant, and dimensionally accurate plastic parts. Due to its exceptional strength and transparency, it is an ideal choice for demanding applications in electronics, automotive, and medical industries.
What is PC molding used for?
PC molding is extensively used for manufacturing parts that require high impact resistance, optical clarity, and heat resistance. Typical applications include electronic enclosures, protective housings, automotive interior and exterior components, transparent covers, medical device housings, and lighting fixtures. Its versatility makes it a top choice for both functional and cosmetic components.
What temperature is used for polycarbonate injection molding?
The typical melt temperature for polycarbonate injection molding ranges from 280°C to 320°C, depending on the specific resin grade and part design. Mold temperatures are usually kept between 80°C and 120°C to help reduce internal stress, improve surface finish, and ensure proper flow. Precise temperature control is critical to avoid defects.
Does polycarbonate need drying before injection molding?
Yes, polycarbonate is a hygroscopic material, meaning it absorbs moisture from the air. It must be thoroughly dried before injection molding, typically at 120°C for 3 to 4 hours, to achieve a moisture content below 0.02%. Failure to dry PC properly can lead to severe defects like silver streaks, bubbles, and loss of mechanical properties.
What are the common defects in PC injection molding?
Common defects in PC injection molding include flow marks, bubbles (voids), sink marks, warpage, and silver streaks. These issues often arise due to the material's high viscosity, improper drying, or poor mold temperature control. Addressing these defects requires careful Design for Manufacturability (DFM) review, optimized gate design, and strict processing parameter control.
How can flow marks and bubbles be reduced in transparent PC parts?
To reduce flow marks and bubbles in transparent PC parts, it is essential to optimize the gate size and location, ensuring a smooth and continuous flow path. Additionally, increasing mold and melt temperatures, improving venting, and ensuring the resin is completely dried can significantly enhance clarity and eliminate trapped air or moisture-related defects.
How do you reduce internal stress in polycarbonate molded parts?
Reducing internal stress in polycarbonate molded parts involves maintaining uniform wall thickness during the design phase and optimizing gate locations. During processing, elevating the mold temperature (80°C–120°C), controlling packing pressure and time, and ensuring a balanced cooling layout are crucial steps to prevent stress-induced cracking during assembly or end-use.
Is PC better than ABS for injection molded parts?
PC is better than ABS when the application demands superior impact resistance, higher heat deflection temperatures, or optical transparency. However, ABS is easier to process, more cost-effective, and sufficient for general consumer goods. The choice depends on your specific product requirements, and sometimes a PC/ABS blend offers the best of both worlds.
What is the difference between PC and PC/ABS injection molding?
PC provides exceptional toughness, transparency, and heat resistance, but can be challenging to mold due to high viscosity. PC/ABS is a polymer blend that combines the impact strength and heat resistance of PC with the excellent processability and lower cost of ABS. PC/ABS is commonly used for automotive interiors and electronics enclosures.
Is polycarbonate better than PMMA for transparent molded parts?
Polycarbonate (PC) is significantly tougher and more impact-resistant than PMMA (Acrylic), making it better for protective covers, safety goggles, and heavy-duty transparent parts. PMMA, however, offers superior optical clarity, UV resistance, and scratch resistance, making it ideal for lenses and outdoor displays. Your choice depends on whether strength or pure optical quality is the priority.
Can you produce optical-grade polycarbonate parts?
Yes, GBM is fully equipped to produce optical-grade polycarbonate parts such as lenses, light guides, and display covers. We utilize high-polish mold finishes (like SPI A-1 or A-2), specialized optical-grade PC resins, and strict process controls to minimize internal stress, birefringence, and cosmetic defects, ensuring pristine optical clarity.
Can you support flame-retardant PC or glass-filled PC parts?
Absolutely. We have extensive experience molding flame-retardant (FR) PC for electrical housings and devices requiring UL94 V-0 compliance. We also process glass-filled PC for structural components that demand enhanced rigidity, dimensional stability, and strength. We optimize mold tooling to handle the specific flow characteristics and tool wear associated with these grades.
What should I provide for a PC injection molding quote?
To receive an accurate PC injection molding quote, please provide your 2D and 3D CAD drawings (STEP, IGES, or SolidWorks formats), the specific PC material grade or property requirements, the expected annual production quantity, surface finish specifications, and any critical dimensional tolerances. This allows our engineering team to perform a thorough evaluation.
Do you support low-volume polycarbonate injection molding?
Yes, we support low-volume polycarbonate injection molding for pilot runs, market testing, and specialized equipment production. We can design cost-effective aluminum or soft steel tooling options tailored to smaller batch sizes, allowing you to validate your design and material choice without the high upfront cost of a multi-cavity hardened steel production mold.
Are you a polycarbonate injection moulding supplier for US and European buyers?
Yes, GBM is a trusted China-based polycarbonate injection moulding supplier serving OEM buyers across the US, Europe, and globally. We offer seamless communication, comprehensive DFM reviews, CMM inspection reports, and export-ready packaging, ensuring that our international clients receive high-quality custom PC parts and mold tooling strictly meeting their local standards.
Can GBM provide both PC mold tooling and molded part production?
Yes, GBM provides comprehensive end-to-end services. We can design and manufacture the PC mold tooling, conduct T1 trials, and handle the mass production of the molded parts under one roof. Alternatively, if you only need the mold, we can build and ship export-ready PC molds directly to your facility, complete with spare parts and documentation.

Get a Polycarbonate (PC) Injection Molding Quote with DFM Review

Send your 2D/3D drawings, resin grade, annual quantity, surface finish, and tolerance requirements. GBM engineers will review your PC part design and recommend a suitable molding solution.

Email Us

Annie@gbminjection.com

WhatsApp / Call

+86 13632611848

Factory Address

Room 101, Jiumo Technology Park, Gangsheng Road, Yabian Village, Shajing Street, Baoan District, Shenzhen City

Submit Your Project Details

Supported formats: PDF, JPG, PNG, STEP, IGES, STL, DWG (Max 20MB)

Choose Files
No file chosen

Supported formats: PDF, JPG, PNG, STEP, IGES, STL, DWG (Max 20MB)

WhatsApp