Automotive Plastic Interior Trim Parts Wholesale

Automotive Plastic Interior Trim Parts

-- Steady & Reliable Manufacturer --

Yuyao Hongli Optoelectronics Co., Ltd. is a trusted OEM/ODM manufacturer of Automotive Plastic Interior Trim Parts, producing lightweight, aesthetic, and high-durability interior components for passenger cars, commercial vehicles, and electric vehicle (EV) platforms. Situated in the Yangming Science and Technology Industrial Park of Yuyao, Zhejiang, our modern 5,000-square-meter facility features high-precision servo injection molding machines, automated spray painting lines, and cleanroom assembly bays. We process premium engineering plastics including ABS, PC/ABS blends, PP, and POM into dash trim panels, air vent grilles, door handle bezels, and center console covers. Adhering strictly to automotive VOC, odor, and flammability standards (FMVSS 302 / UL94), Yuyao Hongli delivers flawless surface aesthetics, precise snap-fit dimensions, and direct-factory manufacturing pricing.

MANUFACTURING CAPABILITIES

Equipment and process capabilities

From mold design to batch stamping, we cover production needs of different tonnages and precision levels.

  • 01

    Precision Servo Plastic Injection Molding

    Utilizing high-precision servo injection molding machines from 120T to 380T, we produce intricate interior plastic trim parts with zero sink marks, clean parting lines, and tight dimensional tolerances within ±0.05mm.

  • 02

    Automated Dust-Free Surface Coating & Painting

    Our enclosed dust-free coating line applies UV-curable clear coats, soft-touch matte paints, and metallic finishes to interior plastic trim surfaces, enhancing scratch resistance and tactile feel.

  • 03

    In-Mold Decoration (IMD / IML) & Laser Etching

    We integrate advanced IMD/IML technology and precision laser etching to create stylish interior textures, metallic accent patterns, and crisp back-lit icon graphics on control panels.

  • 04

    Ultrasonic Plastic Welding & Sub-Assembly

    Utilizing multi-head ultrasonic welding workstations, we join multi-piece interior trim assemblies, mounting clips, and light guide plates with high structural bond strength and zero thermal distortion.

SPEC · Overview of Key Equipment Parameters

Equipment TypeTonnage / SpecificationMachinable MaterialTypical Processing Thickness
Servo Plastic Injection Molding Unit120T - 380T High-Precision ClampABS, PC/ABS Alloy, PP, POM, PA661.2mm - 4.0mm Molded Wall Thickness
Dust-Free Automated Painting Line10,000-Class Cleanroom ReciprocatorAutomotive Interior Grade PlasticsCoating Thickness 15 - 30 microns
Ultrasonic Plastic Welding Machine15kHz - 20kHz High-Power WelderThermoplastic Interior Trim AssembliesPrecision Joint Welding
Precision CNC Mold Machining Center24,000 RPM High-Speed CNC RouterP20, NAK80, 718H Mold SteelHigh-Gloss & Textured Mold Tooling
QUALITY CONTROL

Full-process quality control system

From incoming material inspection to full outgoing inspection, key processes are equipped with inspection points to ensure batch consistency.

Automotive VOC & Low-Odor Standard Testing

Ensuring interior plastic components meet strict cabin air quality and health regulations.

  • Total Volatile Organic Compound (VOC) thermal desorption analysis per ISO 16000.
  • Subjective cabin material odor level testing per VDA 270 standard (rating ≤3.0).
  • Formaldehyde emission testing inside environmental test chambers.

Environmental Aging & UV Weathering Inspection

Verifying color stability and crack resistance under long-term sunlight exposure.

  • Accelerated xenon arc weathering testing (SAE J2527) to check color fading (Delta E < 1.0).
  • Thermal shock cycling (-40°C to +85°C) to verify snap-fit retention and material ductility.
  • FLTM/GM scratch and mar resistance testing on painted and textured plastic surfaces.

Flammability & Snap-Fit Force Validation

Guaranteeing occupant safety and secure assembly inside vehicle cabins.

  • Horizontal flammability testing per FMVSS 302 / ISO 3795 (burn rate < 100mm/min).
  • Push-in / pull-out clip retention force testing on mounting clips.
  • 3D CMM and optical vision measurement for gap and flushness compliance.
SURFACE FINISHING

Surface treatment process

Depending on the usage environment and appearance requirements of the parts, we offer anti-corrosion, wear-resistant, or decorative surface treatment solutions.

Finishing ProcessApplicable MaterialPrimary FunctionTypical Application
Soft-Touch Paint CoatingABS / PC Alloy PartsProvides luxurious velvet-like tactile feel with low-glare surfaceCenter console side trims, armrest bezels, glovebox latches
High-Gloss Piano Black CoatingPC/ABS Blend PlasticsSleek mirror-like deep black decorative finish for modern EV cabinsInfotainment display borders, HVAC control bezels
Electroplating (Satin Chrome)ABS / PC-ABS Trim RingsDelivers premium metallic satin look with superior scratch resistanceAir vent adjustment trim rings, door speaker grilles
Laser Etching & Backlight EngravingCoated Translucent ABS/PCCreates sharp, illuminated button icons and interior ambient trim graphicsSteering wheel switch bezels, window lift button trim
Note: The above is a standard process list. Specific film thickness, color, and salt spray resistance rating can be customized according to customer drawings.
APPLICATIONS

Main application areas

Our products are widely used in industries that require high structural strength and precision consistency.

Passenger Car Dashboards & Center Consoles

Aesthetic, low-glare interior plastic trim bezels and panel covers for modern passenger vehicle cockpits.

  • Air conditioner vent louvers and adjustment trim rings
  • Center console shift lever surround bezels
  • Instrument panel decorative trim strips

Door Panels & Interior Cabin Hardware

Durable, scratch-resistant plastic trim covers and handles engineered for daily cabin interaction.

  • Interior door handle bezels and armrest trim plates
  • Door speaker cover grilles and window switch panels
  • Glovebox door handles and storage compartment latches

New Energy Vehicle (EV) Lightweight Cabin Trim

Specialized lightweight, low-VOC interior trim components designed for modern electric vehicle cabin designs.

  • EV ambient light guide pipes and translucent decorative trim
  • EV dashboard piano-black display frames
  • Lightweight seat rail covers and column trim shrouds
PRODUCTION / FACTORY ADVANTAGES

Factory production advantages

With its own factory and equipment, the company ensures stable delivery times and controllable costs.

20+ Years of Precision Molding & Appliance Heritage

Yuyao Hongli combines two decades of specialized plastic injection molding, tooling design, and assembly in Yuyao, Zhejiang.

Dust-Free Coating & Sub-Assembly Capabilities

Our integrated plant handles injection molding, dust-free spray painting, ultrasonic welding, and clip assembly under one roof.

Low-VOC & Automotive Safety Compliance Readiness

We process low-odor, flame-retardant automotive engineering resins fully compliant with global automotive interior safety standards.

CUSTOM MANUFACTURING PROCESS

Customized production process

From receiving drawings to batch delivery, standardized processes ensure traceability at every stage.

  • 1. Interior CAD & Mold Tooling DFM Evaluation

    Client submits 2D/3D interior CAD drawings (STEP/IGES) for mold flow analysis, parting line placement, and snap-fit optimization.

  • 2. High-Precision Injection Mold Fabrication

    We machine high-grade steel injection molds using CNC high-speed milling and EDM, incorporating custom texture graining (Mold-Tech standards).

  • 3. Mold Tryout, CMM Inspection & VOC Testing

    Sample parts are molded, CMM measured, tested for VOC/odor and flammability compliance, and sent for client visual approval.

  • 4. Cleanroom Injection, Coating & Ultrasonic Assembly

    Automated molding feeds into dust-free spray coating, laser etching, and ultrasonic assembly with 100% cosmetic inspection.

  • 5. Protective Packaging & Export Shipping

    Trim parts are packed individually in anti-static protective bags, boxed in custom dividers, and shipped to automotive assembly lines.

FAQ

Frequently Asked Questions

Here are some questions that clients often ask before cooperating with us.

What plastic resins do you use for automotive interior trim parts?

We process low-VOC automotive-grade resins including ABS, PC/ABS alloys, Polypropylene (PP), POM, PA66, and translucent PC for light-guide applications.

How do you ensure interior plastic parts meet automotive low-odor and VOC standards?

We use certified low-emission raw materials and bake molded parts in temperature-controlled curing ovens, followed by VDA 270 odor testing and thermal desorption VOC analysis.

Can you match custom OEM interior paint colors and surface textures?

Yes. We offer custom color matching (pantone/RAL/OEM master samples) and apply standardized surface textures such as Mold-Tech leather grain, geometric patterns, or high-gloss piano black finishes.

What is your typical production lead time for new interior trim mold tooling?

Mold design and tool fabrication typically take 25 to 35 days. Initial T1 sample inspection parts are delivered immediately following tool tryout.

About Us
Yuyao Hongli Optoelectronics Co., Ltd.
Yuyao Hongli Optoelectronics Co., Ltd.
Yuyao Hongli Optoelectronics Co., Ltd. is a comprehensive enterprise with over 20 years of experience in the manufacturing industry. Located in the Yangming Science and Technology Industrial Park of Yuyao, Zhejiang Province, it enjoys convenient transportation and a solid industrial foundation. As a famous China Automotive Plastic Interior Trim Parts Suppliers and Automotive Plastic Interior Trim Parts Factory, founded in 2000, formerly known as Yuyao Hongli Optoelectronics Educational Instruments Co., Ltd., the company is wholly owned by a natural person, with Xie Gang as the legal representative. Its registered capital of 500,000 yuan has been fully paid up, and it has maintained its continued development through stable operations.
Relying on a 5,000-square-meter modern factory and multiple stamping workshops, the company has built a diversified product system. Its core businesses cover the manufacturing, processing and wholesale and retail of educational instruments, optical instruments, household electric heaters, small household appliances, auto parts, hardware and plastic products, etc. At the same time, it operates and acts as an agent for the import and export trade of goods and technologies, and its products are sold at home and abroad.
The company brings together industry management elites and senior engineers to form a mature R&D and management team. Adhering to the business philosophy of "integrity and pragmatism," it is committed to providing customers with high-quality products and comprehensive after-sales service. Leveraging its diversified portfolio, certification guarantees, and import/export advantages, the company actively expands cooperation both domestically and internationally, and is willing to establish long-term and stable trade partnerships with partners from all sectors, continuously striving forward in the wave of intelligent and high-end development in the manufacturing industry.
GET IN TOUCH

Send Us a Message​

X Facebook
Products News