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High-Precision Automotive Injection Molding

Offering complete solutions compliant with the IATF 16949 standard, we are your injection molding partner committed to optimizing the performance and cost of your automotive plastic components.

Get Automotive Parts Solution

An NDA can be signed if needed before the quotation.

Injection Molded Components for Every Zone of the Vehicle

Automotive injection molded parts are usually split into three main groups according to their location and functional needs: interior, exterior, and functional/structural components. Each category demands certain material properties, surface finishes, and adherence to rigorous performance standards.

Interior Components

Focus on visual finish, tactile feel, and assembly integrity. Solutions for matte, scratch-resistant, and long-lasting interior parts.

Door Handle Base

Ignition Button Cover

Ambient Light Bracket

Sunroof Rail Cover

Exterior Trims

Designed to meet stringent standards for weather resistance, UV stability, and detailed surface finishing. Guarantees color match and long-lasting durability.

Anti-Collision Housing

Car Emblem

Taillight Cover

Rear Fog Light Reflector

Functional & Structural Parts

Focus on compliant material performance, dimensional stability, and structural strength in tough environments (thermal cycling, vibration, chemical exposure).

Car Airbag

Automatic Door Gearbox

Busbar Backplate

Engine Upper Connector

Core Technologies in Automotive Injection Molding Part Manufacturing

Automotive Mold Making

Controlled Car Parts Molding

Spray Coating

Electroplating

Screen Printing

Matte Finishing

Specialized Surface Treatment

Craft Perfection with a Click

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Engineering Materials for Automotive Plastics

Engineering plastics constitute approximately 10% of a modern vehicle‘s weight, a key factor in lightweighting. The market is dominated by a few versatile families: PP leads with 29.9% share, followed by PUR, PA and PE.

Proportion of Automotive Plastics by Type

PP: 29.9%

PU: 15.5%

PVC: 5.4%

PE: 9.2%

ABS: 7.6%

PA: 11.8%

PC: 4.1%

ASA: 1.1%

POM: 2.3%

PBT: 3.6%

PET: 3.4%

PMMA: 1.8%

Others: 4.3%

Automotive Plastics

We have been working with all these automotive materials for over a decade and possess comprehensive knowledge of them. First Mold also has extensive experience with modified materials, reinforced materials, and specialty materials.

We recommend that when selecting automotive plastics, you should prioritize the material’s rigidity, heat resistance, freeze resistance, and heat aging resistance.

On this basis, you also need to consider whether the material possesses the following characteristics: light weight, good processability, excellent comprehensive physical and chemical properties, superior decorative effects, energy efficiency, and environmental friendliness.

Examples:

Requirements for Headlight Materials:

Withstand the impact of road debris (e.g., kicked-up stones) during driving.
Fulfill the primary function of illumination.
Resist deformation, aging, and other forms of degradation in harsh environments (e.g., wind, sun exposure, rain).
Maintain structural integrity without deforming under prolonged exposure to heat from the light source.
Meet the requirements of the injection molding process.
Facilitate the design of injection molds.

Recommended Materials: Modified PC, PMMA.

Requirements for Grille Materials:

Be suitable for subsequent electroplating processes.
Resist deformation and aging under high-temperature exposure and sunlight.
Maintain dimensional stability during long-term operation.
Meet the requirements of the injection molding process.
Facilitate the design of injection molds.

Recommended Materials: ABS, ABS/PC.

Explore our material database, including technical data sheets and IMDS compliance information for over 100 engineering plastics.
➔ Visit Our Injection Molding Materials Center

Our All-In-One Quality And Compliance Program

IATF 16949

Core of Quality Management in the Automotive Industry

Foundation

ISO 9001

Establishes automotive quality management foundation and builds standardized quality control system

Core Process

PPAP

Ensures automotive production part approval processes to guarantee product consistency and compliance

Material Compliance

IMDS

Manages global material data reporting and compliance to meet environmental and industry requirements

Your Automotive Parts Injection Molding Project Workflow

Upload 3D Files

You: Upload 3D data of automotive parts (e.g., STEP, IGES) and technical requirements (material specifications, surface treatments, etc.).

DFM Analysis

Factory: Analyze your vehicle part’s design to ensure it can be produced efficiently. Check factors like wall thickness, draft angles, etc.

Proposal and Quotation

You: This is your decision point. You can request the factory’s quotation with sufficient details based on your requirements.

The following processes for automotive rapid molds and production molds are largely identical. Their differences are in manufacturing lead time, precision, and trial runs.

Mold Manufacturing

Factory: Based on your selected option, our mold workshop builds the dedicated injection mold for your automotive part.

First Sample Delivery

You: You receive functional samples to test design, fit, or market readiness. Confirm the samples meet your standards.

Production

Factory: We carry out injection molding and conducts random or full inspection based on specific circumstances.

Start Your Auto Parts Project

Cost Structure for Automotive Injection Molding

FAQ for Automotive Injection Molded Parts

How detailed do the 3D files need to be to get started? What if we only have a concept or sketches?

We suggest you send us 3D files in STEP, IGS, or STP formats. You also need to let us know the material you want and how many products you need to make. If you only have a rough idea or drawings of the product, we suggest you finish the 3D file first — we can’t give you a price quote otherwise. First Mold can give tips for mold design and production, but we don’t do professional product design.

Who owns the mold? How is the mold handled if the project ends?

The mold definately belongs to you (the client). If your mold is used here for injection molding, we’ll keep it stored for some time even when the project ends.

During high-volume production, how can we monitor production progress and quality?

Usually, clients doing large-scale production send people to check in now and then, or have someone stay here full-time to keep track of how the project’s going. If that’s not easy for you, our project manager can send you photos/videos of key progress points regularly, or do online video calls to go over how things are going.

If an Engineering Change Notice (ECN) is required during mass production, what are the typical procedures, timelines, and cost implications?

When we start the formal ECN review process, we’ll give you a change plan, how it’ll affect timelines, and a cost quote — we’ll only move forward after you approve it.

What are the standard payment terms? (e.g., upfront percentage for mold cost, payment terms for production orders)

For automotive molded parts: Pay 50% when you place the order, then pay the other 50% when production’s done (before we send the goods).

What is the MOQ for mass production? Are there special policies for new product trials?

Technically, we don’t have a strict MOQ (Minimum Order Quantity). But we suggest making at least 50 pieces of your product. Please note: fewer pieces will make each one more expensive.

How do you ensure the confidentiality of our design files and project information? Can we sign an NDA?

Of course. We can sign an NDA even before you send us the 3D files. We keep your info safe using encrypted data and a tiered access system. Everyone working on your project will also sign privacy contracts.

If we’ve experienced quality issues with previous suppliers, what specific measures do you have in place to prevent similar problems?

Tell us about working with your last supplier. From the problems you had, our engineers will hold special meetings to fix those exact issues. Also, we can make things more precise to match what your product needs exactly — these are standard steps under the IATF 16949 system.

If our project demand is expected to grow rapidly over the next 12–24 months, do you have sufficient reserved capacity or a rapid scale-up plan to support this growth?

Sure. We have extra production space saved, plus ways to quickly scale up. We also make backup production plans for key clients to help them grow.

What are the main advantages of injection molding over other processes (e.g., blow molding, compression molding) in automotive manufacturing?

It lets us make complex, precise, lightweight automotive parts quickly — so the vehicle parts are strong but not expensive, which works really well for large-scale car production.

How does automotive part design impact the final quality and cost of injection-molded components?

Design decides how complex the mold is, how much material we use, and how fast we can make automotive parts. Good design is key to getting high quality, low cost, and fast mass production.