Suzhou, China – The same medical monitor or industrial controller conveys a completely different impression to end users depending on whether it wears a matte leather-grain housing or a high-gloss mirror-finish housing. The former feels professional, understated, and dirt-resistant; the latter feels refined, technological, and eye-catching. Both "expressions" can be achieved through the same process – Vacuum Forming.
Suzhou-based SWELLDER, with nearly two decades of expertise in vacuum thermoforming and heavy-gauge thermoforming, has integrated mold-engraved texturing and mirror-polishing techniques into its forming workflow. ABS equipment housings can now directly achieve fine leather-grain or high-gloss mirror finishes – without secondary painting. This "form-and-finish-in-one" capability is attracting growing attention from product managers and industrial designers in medical devices, industrial instruments, and commercial seating.
Leather-Grain vs. High-Gloss: How Surface Finish Defines Product Positioning
In industrial design, surface gloss is one of the key parameters that defines a product's "character."
Leather-Grain (matte, gloss ≤30°): After the mold surface is finely engraved, the formed housing presents a uniform leather texture. The microscopically rough surface diffuses light, delivering a visual impression that is steady, restrained, non-reflective, and glare-free. The textured surface also offers a hidden advantage: minor scratches from daily use are naturally absorbed by the grain, keeping the housing looking clean over time. This makes leather-grain housings particularly suitable for ICU monitors, laboratory instruments, and industrial control panels – scenarios that require prolonged viewing and frequent wiping.
High-Gloss (gloss ≥85°): The mold surface is precision-polished to a mirror grade (Ra≤0.05μm). After forming, the housing delivers a piano-like high-gloss visual effect with clear light reflection – refined, bright, and impactful. The glossy surface, combined with good light transmission, can also enable design features like hidden indicators and ambient light halos. High-gloss housings are better suited for high-end consumer electronics, smart home panels, beauty devices, and commercial seating – applications that need to attract attention and convey a sense of technology.
Through precise control of mold polish, forming temperature curves, and sheet material selection, SWELLDER can switch between leather-grain and high-gloss finishes on the same production line. Clients don't need to change their process path – only adjust mold surface treatment and forming parameters.
Same Process, Two Finishes: How Vacuum Thermoforming Handles Both Textures
Whether leather-grain or high-gloss, SWELLDER's vacuum thermoforming process follows the same technical logic – heating a thermoplastic sheet to its forming temperature and using vacuum pressure to pull it against a single-surface mold. When sheet thickness exceeds 1.5mm, the industry refers to it as heavy-gauge thermoforming, capable of producing large parts exceeding 2 meters in length with wall thicknesses up to 8mm or more.
Achieving Leather-Grain: The mold surface is textured via electrical discharge machining or fine engraving. The texture is transferred directly to the housing surface during forming, with uniform depth and direction, offering a warm tactile feel and a visual effect close to genuine leather. The texture library includes lychee grain, classic leather, horizontal lines, geometric patterns, and more.
Achieving High-Gloss: The mold surface is precision-polished to a mirror grade, combined with high-gloss ABS sheet and optimized forming temperature curves. The formed housing achieves a gloss level exceeding 85 degrees without secondary painting. A hard coating (pencil hardness ≥2H) can be applied to resist daily wiping and minor scratches.
Shared advantages of both finishes include:
Color is the material's natural color, not paint – color won't peel from scratches, and the base won't show through after long-term use
Functional features formed simultaneously – reinforcing ribs, mounting bosses, clip slots, and ventilation grilles can be integrated
Tooling cost only 1/10–1/20 of injection molding – particularly suitable for small-to-medium volume projects
Short lead time – mountable samples available in 5–7 days
Application Scenarios: Who Chooses Leather-Grain, Who Chooses High-Gloss
Leather-Grain Housing is typically chosen by medical device, industrial instrument, and communication cabinet manufacturers. One East China medical device company developing a next-generation ICU monitor selected SWELLDER's black ABS leather-grain housing. The mold surface received fine-texture EDM treatment, delivering a uniform matte finish with no reflective interference under light. Screw bosses and cable slots were integrally molded on the back, improving assembly efficiency by 30%. Medical-grade ABS resists alcohol and disinfectant wipes. After launch, multiple top-tier hospitals reported: "It looks exactly like what a professional device should look like."
High-Gloss Housing is typically chosen by smart home, beauty device, and commercial seating manufacturers. A smart home brand launching a premium control panel required an appearance "as refined as a smartphone." SWELLDER provided a high-gloss black thermoforming solution: mold mirror-polished to Ra≤0.05μm, achieving 88-degree gloss without painting. Unit cost dropped 40% compared to the original injection molding plus painting solution, and production lead time was cut by 50%. The brand's product director commented: "The quality of thermoformed high-gloss black exceeded our expectations."
High-Gloss Backrests represent another product line extension – SWELLDER applies high-gloss mirror finishing to ABS seat backrests, achieving over 85-degree gloss with an optional hard coating. The curved surface follows ergonomic principles, contouring to the natural curve of the human spine, with reinforcing rib grids and mounting clip slots integrally molded on the back. Suitable for medical examination chairs, office chairs, public transport seating, and commercial lounge seating.
Beyond Black: More Possibilities in Color and Texture
Beyond classic matte leather-grain black and high-gloss black, SWELLDER's vacuum thermoforming process also supports:
Custom colors: High-gloss white, silver gray, champagne gold, deep space blue – RAL/Pantone matched
Dual-finish: Matte and high-gloss areas on the same housing, achieved through mold texture zoning
Pearlescent effects: Pearlescent horizontal grain and fine sand textures for flowing light reflection
Multiple textures: Leather grain, lychee grain, horizontal lines, geometric patterns – enhancing grip feel and visual depth
Industry Trends: Vacuum Thermoforming Market Continues to Expand
According to market research, the global plastic vacuum forming machine revenue reached approximately RMB 5.78 billion in 2025 and is expected to approach RMB 9.04 billion by 2032, with a CAGR of 5.6%. Another report estimates the vacuum thermoforming machine market at USD 714 million in 2025, projected to reach USD 1.58 billion by 2032, at a CAGR of 12.04%. Growth is driven by expanding demand for customized, high-quality plastic components in medical devices, industrial protection, automotive interiors, and consumer electronics.
Vacuum thermoforming's adaptability in small-batch, customized markets is gaining favor, particularly in medical devices and industrial protection. Clients are demanding more personalized solutions in product styling, structural support, and assembly methods, requiring manufacturers to have flexible mold-adjustment capabilities. SWELLDER's fast tooling and flexible production capabilities directly address this trend.
From Drawing to Housing: SWELLDER's One-Stop Service
SWELLDER provides full-service support – from DFM (Design for Manufacturability) analysis and mold development to sample production and volume manufacturing. The factory is located in Suzhou, adjacent to Shanghai Port, offering convenient export logistics. Capable of producing parts up to 8mm in thickness and exceeding 2,000mm in length, with a material portfolio covering ABS, PC, HDPE, PP, PMMA, PETG, and other mainstream engineering plastics.
For product managers and industrial designers debating what their equipment should "wear," SWELLDER's advice is straightforward: Send us a drawing. In one week, you'll see the actual part – leather-grain or high-gloss – your choice.
About SWELLDER:
SWELLDER has specialized in Vacuum Forming and Heavy-Gauge Thermoforming for nearly two decades, providing custom non-standard plastic housings and components – from drawing to mass production – for medical devices, industrial automation, smart home, commercial equipment, and other industries. Fast tooling, flexible manufacturing, and reliable delivery are our core strengths.