What is No. 8 finish on stainless steel?
It refers to a surface roughness Ra≤0.01μm, light reflectivity of 90%-93%, and no visible polishing lines, pits, or flaws under normal lighting. It clearly reproduces images and scenery without distortion or haze. It is compatible with mainstream stainless steel grades such as 304, 316L, and 201, without altering the corrosion resistance or mechanical properties of the base material, combining decorative and practical functions.
|
Surface Roughness (Ra) |
≤0.01μm |
|
Light Reflectivity |
90%-93% |
|
Wear Resistance |
Better than ordinary brushed and 6K mirror finishes |
|
Corrosion Resistance |
Consistent with the base material (304/316L characteristics) |
|
Thickness Loss |
0.02-0.05mm/single side |
No. 8 Finish vs. Other Common Finishes
|
Finish Type |
English Name |
Surface Roughness (Ra) |
Visual Features |
Typical Applications |
Price Range |
|
No.4 |
Brushed Finish |
0.1-0.3μm |
Unidirectional brushed texture, matte finish, easy to hide scratches |
Ordinary building exterior walls, kitchen equipment, food processing equipment |
Low |
|
6K |
General Mirror Finish |
0.02-0.03μm |
Shiny, fine scratches/grinder marks visible at close range, blurred imaging |
Ceiling interiors, non-core decorative areas, budget-limited projects |
Medium |
|
No.8 (Core Recommendation) |
No.8 Finish |
≤0.01μm |
Mirror-clear, no texture, distortion-free imaging, high-end texture |
High-end buildings, elevator cabs, luxury displays, precision equipment |
Medium-High (Best Cost-Effectiveness) |
|
10K/12K |
Super Mirror Finish |
≤0.005μm |
Extremely black and shiny, no orange peel texture, mainly hand-polished |
Luxury store decoration, optical instruments, high-end automotive interiors |
Very High |
Production Process of No. 8 Finish Stainless Steel:
Base Material Selection: Prioritize stainless steel coils or plates with no obvious defects, such as 201, 304, and 316L. The base material surface should be free of oxide scale, weld seams, and pits; this is the foundation for a mirror finish.
Rough Grinding: Use coarse abrasive to remove the oxide layer, scratches, and unevenness from the base material surface, initially smoothing the surface.
Fine Grinding and Polishing: Using progressively finer abrasives, repeated grinding eliminates the fine scratches left by coarse grinding, gradually smoothing the surface.
Mirror Polishing: A high-speed cloth wheel with specialized polishing compound performs the final fine polishing, enhancing surface reflectivity and achieving a mirror-like effect.
Cleaning and Protection: Professional cleaning removes polishing dust and residue. Optional anti-fingerprint treatment prevents fingerprints, while also improving corrosion resistance and extending service life.
No. 8 Finish Stainless Steel's 4 Core Advantages
Ultimate Appearance, Enhancing Project Sophistication: The high-reflectivity mirror effect makes spaces brighter and more open, exuding a luxurious feel. Commonly used in shopping malls, hotels, luxury stores, and high-end office buildings for elevators, walls, and ceiling decorations, instantly elevating the overall design quality and making it the "face" of high-end projects.
Easy to clean and highly hygienic: The No.8 finish surface is dense and non-porous, preventing dirt and grime buildup. Daily cleaning requires only water or a neutral detergent. It meets food-grade and medical-grade standards, making it suitable for kitchen and bathroom countertops, medical device housings, food processing equipment, and more.
Stronger corrosion resistance and longer lifespan: The precision polishing process forms a passivation film on the stainless steel surface, effectively enhancing its resistance to rust and salt spray. Compared to ordinary polished surfaces, No.8 finish stainless steel can be used long-term in both indoor and outdoor environments, resisting rust and fading, thus reducing maintenance costs.
High versatility and customizable: We support customization of thicknesses (0.3mm-10mm) and sizes (standard or custom) to meet customer needs. Processing techniques include shearing, bending, stamping, and welding. It is suitable for various applications such as architectural decoration, kitchen and bathroom appliances, automotive interiors, and high-end hardware, meeting the personalized needs of different projects.
Why choose our No.8 finish stainless steel?
Quality Assurance: Strictly adhering to ASTM standards, employing multiple precision processes, each batch of products undergoes rigorous testing, and test reports are available to ensure the elimination of substandard products.
High Cost-Effectiveness: Direct supply from the manufacturer, eliminating middlemen and their markups. Bulk purchases enjoy exclusive discounts, and small-batch customization is also supported.
Customization Capabilities: Supports customization of different materials, thicknesses, sizes, and processing techniques to suit your specific project needs.
Comprehensive Service: Free sample testing is provided, professional customer service offers one-on-one answers to selection questions, full order progress tracking, and guaranteed after-sales service.
