Why Are High-Gloss Black Exterior Trim Parts (No-Spray Process) Suddenly So Popular in 2026?

When you visit new car showrooms recently, you will notice a clear change: piano-black exterior trim parts that were once only used on premium models priced above 300,000 RMB are now commonly found on mainstream electric vehicles in the 100,000–150,000 RMB range. Front grilles, A-pillar trims, side mirror housings, and illuminated rear badges are all finished in a uniform, deep high-gloss black. When touched, they show no sharp odor typical of conventional paint, and they are far more resistant to scratches and whitening. This is the no-spray high-gloss black material that had been quiet for nearly a decade but has suddenly seen large-scale adoption in 2026.

1. Past decade: Why has it consistently been “loud in concept but weak in adoption”?

The principle of no-spray high-gloss finishing is quite simple: black high-gloss effect additives are directly blended into plastic resin pellets, and the part achieves a glossy black appearance through one-step injection molding. This eliminates the traditional three-layer coating process—primer, color coat, and clear coat. In theory, it can reduce single-part manufacturing costs by 30%–50% while significantly lowering VOC (volatile organic compound) emissions.

However, it has long been difficult to scale this technology for large automotive exterior components due to two fundamental limitations: 

1. Zero tolerance for surface defects: Pure high-gloss black surfaces are extremely sensitive to even minor imperfections. Injection molding defects such as weld lines and flow marks become highly visible under a glossy finish. Any slight deviation in mold temperature control or gate design can lead to unacceptable visual defects, resulting in immediate part rejection.

2. Insufficient outdoor durability: Early dedicated resin formulations lacked adequate weather resistance and scratch resistance. Prolonged UV exposure could cause yellowing, while everyday impacts such as car washing or road debris could easily leave visible white marks. Since exterior parts are continuously exposed to harsh outdoor environments, OEMs were reluctant to adopt them at scale. Due to these constraints, the process was previously limited to interior high-gloss trim components or small exterior decorative parts. Large-area applications such as front grilles and A-pillar trims were rarely used in mass production vehicles.

2. 2026: A Year of Rapid Market Expansion Driven by Three Key Factors.

2.1 Price wars force cost reductions, making the business case for cost-saving measures compelling.

With competition for 100,000–150,000 RMB new energy vehicle (NEV) models reaching a fever pitch in 2026, OEMs are pushing component cost reductions to the limit. Gloss-black exterior grilles produced via conventional three-step painting processes incur high comprehensive costs due to factors such as material waste, exhaust treatment, and labor. In contrast, using paint-free PMMA/ASA materials—processed via single-step injection molding—cuts unit costs by 30%–50% while reducing environmental maintenance expenses associated with painting lines. This approach simultaneously addresses cost-reduction goals and environmental compliance requirements, prompting OEMs to aggressively drive the adoption of these materials this year.

2.2 Simultaneous technological breakthroughs in materials, molds, and processes (the most critical factor).

Materials: Mass production has been achieved for PMMA/ASA alloys, modified high-gloss ASA, and PC/ASA composites; these materials demonstrate outdoor weather resistance exceeding 1,000 hours of testing, surface scratch hardness reaching the 2H level, and uniform black coloration in finished parts.

• On the mold side, the standard configuration—comprising RHCM (Rapid Heat Cycle Molding) equipment, high-precision high-gloss mold temperature controllers, and sequential valve gates—enables weld lines to be shifted to the vehicle's unseen inner surfaces, thereby eliminating cosmetic defects at the source.

• On the process side, mold-flow simulation software is used to anticipate issues like air entrapment and flow marks, allowing for the pre-optimization of mold temperature profiles; consequently, the yield rate for paint-free finished parts has risen from 60% in the early stages to over 85%, ensuring risks during mass production remain fully under control. It is the simultaneous implementation of these three technologies that has made the mass production of large-scale exterior components a reality.

2.3 The enclosed front-end design of electric vehicles drives demand for high-gloss black finishes.

New energy vehicles have eliminated traditional air intake grilles in favor of enclosed front-end styling, shifting the grille's function toward decoration and serving as a platform for lighting-based interaction. Consequently, vehicle design relies heavily on a combination of high-gloss black finishes, full-width light strips, and illuminated logos. While traditional painting can achieve a black finish, it entails higher costs; in contrast, paint-free solutions deliver a uniform, premium black aesthetic while reducing component expenses, making them the preferred choice for designers.

3. Three mainstream pathways for paint-free substrate materials (simplified classification)

1.  PMMA/ASA alloy: Offers a high-gloss finish and superior weather resistance, though toughness is relatively low. The industry commonly employs a dual-layer, dual-color injection molding process (a 0.8–1.2 mm thick PMMA outer layer for aesthetics and an ASA inner layer for structural support). It is widely used for grilles, A-pillar covers, and illuminated emblems on mid-to-high-end vehicle models, though costs are relatively high.

2. High-gloss modified ASA: Offers superior toughness and outdoor weather resistance that meets exterior trim standards; while its high-gloss finish is slightly inferior to alloy materials, it allows for single-layer, one-piece injection molding at a lower cost. It is commonly used for rearview mirror housings and lower body trim strips, making it suitable for mass-market vehicles in the 100,000 RMB price range.

3. PC/ASA composite materials: Offer a balance of toughness and weather resistance, enabling the creation of integrated exterior components with complex curved surfaces; however, their high raw material cost limits their use to a small number of high-end integrated front-end designs.

4. Industry-standard selection logic: Mid-to-high-end models utilize PMMA/ASA dual-shot molding to ensure premium aesthetics, whereas mass-market models opt for single-layer high-gloss ASA to minimize costs.

4. Three types of players are reaping the benefits of this high-growth market segment:

• Material manufacturers: Domestic modified plastics companies—such as Wanhua, Kingfa, and Pret—have launched compliant, automotive-grade, paint-free black raw materials; the volume of PMMA/ASA alloys used for automotive exterior components is projected to double year-over-year by 2026.

• Mold and Injection Molding Manufacturers: Factories capable of RHCM (Rapid Heat Cycle Molding) and sequential gating processes are operating at full capacity, as standard injection molding workshops lack the capability to handle this type of work; the industry barrier lies in mold temperature control and upfront mold-flow analysis rather than basic injection molding equipment.

• Automotive OEMs: The rollout of all-new vehicle lineups for 2026 by Changan, Geely, BYD, and GAC Aion—specifically the large-scale adoption of paint-free processes for glossy black front-end exterior components in the 100,000–200,000 RMB price range—is the primary driver behind this surge in market volume.

5. Not a disruptive technology, but a source of guaranteed dividends

As the technology moves toward large-scale implementation, two major industry challenges have emerged: the difficulty of controlling color consistency across production batches. Even slight fluctuations in raw materials or mold temperatures between batches can result in visible differences in blackness. OEMs currently demand a color difference value (ΔE) of less than 0.3—a standard even stricter than that for interior components—placing extremely high demands on material stability and mold precision.

There is currently no mature solution for recycling these materials. While "paint-free" components lack a paint layer and are theoretically recyclable, incorporating recycled content directly compromises the finished product's blackness and outdoor weather resistance. The industry is still exploring safe blending ratios; suppliers who are the first to establish a closed-loop recycling system will secure a competitive edge in the next wave of cost reduction.

It is not a disruptive technology, yet it perfectly capitalized on emerging market trends. The market surge anticipated for 2026—which may appear sudden—is actually the result of a decade of technological accumulation across four key areas: materials, molds, vehicle design, and cost control. Paint-free high-gloss black plastic may not qualify as a revolutionary "black technology," but it precisely aligns with three critical market demands: the need for specific exterior designs in electric vehicles, the imperative for extreme cost control, and the drive for environmental sustainability and emission reduction. Opportunities where such multiple favorable factors converge are rare in the automotive interior and exterior sectors, and this segment is poised for sustained structural growth over the next three years.

The division of labor across the entire industry chain has been restructured. The traditional workflow involved material supply, followed by injection molding, and finally painting by the automaker. The new process chain, however, involves material suppliers providing specialized raw materials and mold-flow solutions; mold manufacturers producing custom high-gloss, temperature-controlled molds; and injection molders delivering the finished part in a single molding step. Companies at all stages of this value chain—both upstream and downstream—warrant renewed strategic attention.