Manufactured with surgical-grade 304 and 316L Japanese stainless steel sheets (0.5mm - 0.8mm). Featuring ion plating, micro-etched textures, and resilient spring/screwless hinge assemblies.
Founded on a profound technical legacy dating back to the 1960s, our manufacturing framework was shaped directly at the optical bench. Our founder, Yang Wah Kiang, began by grinding prescription glass lenses by hand in Singapore workshops. That foundational understanding of optical center placement, vertex distance, pantoscopic tilt, and mechanical rim tension still dictates our stainless steel frame engineering today.
Unlike ordinary metal stamping workshops that treat spectacle frames as decorative accessories, our manufacturing philosophy views the frame as an ultra-precise medical apparatus. We coordinate operations through our Singapore International Headquarters, our French creative studio in Douvres-la-Délivrande, an R&D lineage directly affiliated with Japanese precision mechanics, and our massive 5-axis CNC manufacturing campus located in Shenzhen, China.
We source authentic Japanese high-tensile 304 and 316L austenitic stainless steel alloys. These offer superior modulus of elasticity (193 GPa), exceptional corrosion endurance, zero copper inclusions, and guaranteed nickel release compliance under EN 1811:2011 standards.
Eliminate loose hinge screws forever. Our proprietary screwless hinge mechanisms and active spring friction dampers utilize interlocking metal hooks, silicone gaskets, and elastic tension blades that survive over 25,000 cyclical open-close movements without losing resistance.
Our surface finishing cleanrooms employ Physical Vapor Deposition (PVD) titanium sputtering alongside multi-stage IP gold, palladium, and ruthenium treatments. Delivering layer thickness up to 0.5μm, achieving 48-hour artificial sweat resistance without oxidation.
A detailed engineering comparison highlighting why global eyewear chains are actively replacing standard monel, nickel-silver, and generic alloys with sheet stainless steel.
| Material Metric | Medical Stainless Steel (304 / 316L) | Beta-Titanium / Pure Titanium | Traditional Monel / Nickel Silver | Standard Memory TR90 Nylon |
|---|---|---|---|---|
| Elastic Modulus (Stiffness) | 193–200 GPa (Optimal Rigidity) | 105–110 GPa (Extremely Flexible) | 160 GPa (Deforms under stress) | 1.8–2.2 GPa (Ultra-soft polymer) |
| Minimum Sheet Thickness | 0.50 mm (Razor-thin profiling) | 0.60–0.80 mm | 1.20 mm (Bulkier cross section) | 1.80 mm (Thick injected walls) |
| Prescription Lens Retention | Absolute Precision (Tight Groove Lock) | Moderate (Can splay under high minus) | Poor (Prone to screw loosening) | Variable (Sensitive to hot glazing) |
| Nickel Release (EU REACH) | < 0.28 μg/cm²/week (Safe Pass) | Zero Nickel Content | Frequently Fails European Border Checks | Zero Metal Content |
| Tooling & Unit Cost Ratio | Balanced Cost / High Luxury Margin | Very High Tooling & Material Cost | Low Cost / Very Low Perceived Value | Low Unit Cost / High Mold Investment |
| Structural Memory Recovery | 98.5% recovery after 45° bend | 99.9% super-elastic recovery | 60% (Requires manual realigning) | 95% (Risk of thermal warping) |
For ultra-detailed patterns, perforated rims, and dual-surface branding, we combine photolithographic chemical etching with laser cutouts. This yields micro-radius chamfers with zero burrs, reducing manual hand-polishing time by 40% while preserving absolute structural symmetry.
Multi-stage 80-ton to 120-ton hydraulic press dies sculpt 3D dimensional bridge steps, contoured end-pieces, and integrated nose pad arms directly from homogeneous steel sheets. This eliminates brittle soldered joints and creates seamless unibody architectures.
Before entering ion-plating reactors, every stainless frame undergoes 5-stage automated ultrasonic cleansing in deionized water baths. This strips sub-micron oils and particulate debris, ensuring flawless adhesion of PVD titanium nitride coatings with zero peeling or blistering.
How progressive optical retail brands, lab chains, and e-commerce platforms can capitalize on evolving manufacturing technologies, circular supply chains, and ergonomic consumer demands.
Consumer preference has shifted decisively toward featherweight, barely-there minimalist frames. The development of cold-rolled high-tensile 301 and 304 stainless steel allows factories to roll sheets as thin as 0.45mm without risking structural bending during prescription lens mounting.
Traditional silver-welded joints constitute 85% of point-of-sale customer returns due to snapping. Next-generation stainless collections use interlocking friction tabs, cold-pressed rivets, and CNC-bent unibody bridges, maximizing recyclability and eliminating heavy-metal flux brazing.
Optical brands are blending stainless steel front profiles with biocompatible Mazzucchelli acetate Windsor rims, ultra-flexible TR90 inner eye-wires, or carbon fiber temple accents. This creates stunning multi-dimensional textures while retaining rigid stainless steel lens eyewires.
B2B buyers are abandoning massive inventory stockpiling in favor of rapid agile replenishment. By combining modular laser cutting tooling with on-demand PVD color scheduling, modern factories can accept flexible initial trial runs of 300 units across multi-color skus.
We streamline the journey from initial industrial design rendering to mass-production delivery with clear technical stage-gates:
As the powerhouse behind five internationally recognized eyewear labels, we provide our wholesale and OEM partners with authentic design pedigrees validated by the world's most demanding design juries.
Engineered children's and youth eyewear utilizing flexible titanium and surgical stainless steel front combinations. Features patented nylon-string soft-lock temple connections that withstand repeated bending, twists, and classroom impacts.
Avant-garde women's architectural eyewear uniting crystal translucent composites with razor-thin stainless steel wire cores. Bold geometric cuts, cat-eye profiles, and double-color vacuum ion plating.
Urban minimalist eyewear born from our French design studio. Featuring our world-famous screwless hinge architecture, RX-Sport 2.0 active performance lines, and featherweight daily executive frames.
Ergonomically tuned near-vision eyewear designed specifically for mature presbyopes. Crafted with balanced center of gravity, non-slip silicone nose pads, and ultra-durable stainless steel temples.
Between 2006 and 2024, our proprietary frame concepts achieved 14 international design awards, 6 nominations, and 1 invited recognition across prestigious programs including:
When you partner with our factory, you don't simply purchase metal frames—you tap into an award-winning design laboratory capable of elevating your brand above generic market copycats.
Clear, technically documented answers regarding minimum order quantities, manufacturing tolerances, regulatory certifications, and custom tooling.
We strictly utilize certified Japanese and European-standard SUS304 and medical-grade SUS316L austenitic stainless steel. SUS316L contains 2–3% molybdenum, offering superior resistance to pitting corrosion from human sweat and harsh atmospheric humidity. We provide complete mill test certificates (MTC) with chemical composition and tensile strength analysis for every production batch.
Our standard MOQ for fully customized OEM frame designs is 300 pieces per model, which can be split across up to 3 colorways (e.g., 100 pcs Matte Black, 100 pcs Brushed Gunmetal, 100 pcs Rose Gold). For ready-to-ship models from our active warehouse inventory, we can accommodate low-volume initial trial orders starting at 50 pieces per SKU.
We test every production lot in accordance with EN 1811:2011+A1:2015 (reference test method for release of nickel from all post assemblies). The regulatory threshold is 0.5 μg/cm²/week for skin contact and 0.28 μg/cm²/week for prolonged direct contact. Our PVD coated 304/316L frames consistently test well below 0.1 μg/cm²/week, ensuring 100% compliance with EU REACH Annex XVII.
Yes. Although our sheet profiles are razor-thin (0.6mm–0.8mm), we engineer our eyewires with reinforced 120° V-grooves and calibrated rim-lock locking lugs. In addition, we manufacture windsor-rim hybrids and stepped eye-wire profiles that conceal thick prescription lens edges while preventing frame splaying or lens pop-out.
Custom 3D CAD drawings and optical schematics are generated within 3–5 working days. Physical hand-crafted functional prototypes take 10–14 days. Tooling and progressive stamping die fabrication require 25–30 days. Full mass manufacturing and multi-stage PVD plating cycle is completed in 45–60 days upon final sample approval.
Our manufacturing and assembly facilities operate under ISO 9001:2015 and ISO 13485:2016 quality management systems. All optical frames comply with ISO 12870 (Spectacle frames - Requirements and test methods), CE Medical Device Regulation (EU) 2017/745 (MDR) Class I, and US FDA 21 CFR 801.410 drop ball impact resistance regulations.
Standard screw-based spring hinges suffer from thread back-out, stripped heads, and internal spring degradation over time. Our screwless hinge systems utilize interlocking geometric cuts and elastic steel tension clips. They require zero screws, do not loosen with prolonged wear, and provide a self-lubricating, fluid opening experience rated for over 25,000 cycles.
Yes, we provide complete turnkey private label solutions. We execute ultra-sharp fiber laser engraving on inner and outer temples, pad printing, customized silicone and titanium nose pads with your emblem, acetate temple tip color matching, and custom branded hard cases, microfiber cloths, and outer retail gift boxes.
Connect directly with our engineering and procurement team in Singapore, France, or Shenzhen. Request our latest B2B wholesale product catalogue, review material compliance dossiers, or schedule custom OEM sampling for your next optical line.
