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KO Dual-Nanoceramic Coating withstands 135 thermal cycles without discoloration and protects cookware for long periods at 400–800°C.
Stainless steel is highly prized for its durability and distinctive style. However, even the highest-quality stainless steel products can suffer from one major flaw that could ruin your cookware or your day: discoloration and degradation in scratch resistance caused by extreme heat. Regular coatings deteriorate over time with heating, cleaning agents, and thermal shock, leading to stained, discolored pans and peeling coatings.
Why Stainless Steel Cookware Turns Yellow: The Science Behind Discoloration
High-Temperature Oxidation
When the surface of stainless steel is exposed to extremely high temperatures (over 400°C), it reacts with oxygen. This leads to the formation of chromium oxide layers, which appear on the surface as a yellowish or brown hue. Over time, these oxides grow thicker, resulting in permanent staining.
Microstructural Changes
Repeated heating and cooling cause the metal’s lattice structure to stretch and shrink, a process known as thermal fatigue. This weakens the material and accelerates surface erosion.
Chemical Interactions
Salt residues, acidic cleaning agents, and detergents seep into fine pores or weak spots in the coatings, causing electrochemical corrosion. Even stainless steel isn’t immune to this process.
Limitations of Conventional Coatings
Many commercial coatings are based on organic polymers or silicones. These compounds decompose quickly under thermal stress, releasing toxic fumes at high temperatures. The adhesive properties of such coatings degrade over time, leading to frequent recoating and customer dissatisfaction.
Dual-Nanoceramic Protection: How It Works
The dual-nanoceramic coating system features two powerful layers that provide an impenetrable barrier against heat, chemicals, scratching, and abrasion:
Layer 1: High-Temperature Anti-Oxidation Primer
This inorganic, water-based primer serves as the base coat for thermal barrier coatings.
Key Features:
- Heat Stability: Withstands temperatures from 400–800°C without deforming.
- Hardness: ≥5H pencil hardness for scratch resistance.
- Ultra-Thin Coverage: Approximately 1μm in thickness, so it doesn’t affect performance.
- Fast Drying: Dries to the touch in 1-3 minutes at room temperature or 60–80°C for 1 minute.
The nanostructured silica matrix of the primer chemically reacts with the metal surface, creating a barrier that limits oxidation at the atomic level.
Layer 2: High-Temperature Anti-Yellowing Nanoceramic Topcoat
The second layer protects the surface from UV exposure, abrasion, and chemical attack.
Key Features:
- Nanoceramic Formula: Creates an ultra-dense hydrophobic barrier with water-soluble ceramic nanoparticles.
- 9H Pencil Hardness: Provides extreme scratch protection, surpassing steel and other tough materials.
- Thermal Shock Endurance: Can withstand sudden temperature changes, from 400°C dry burning to ice water quenching.
- Non-stick Feature: Makes cleaning easier by reducing sticking of food.
Synergy of Dual Layers: The combination of the two layers forms an ultra-thin (less than 11 μm) shield that provides oxidic resistance and mechanical durability. The primer prevents subsurface deterioration, while the topcoat resists heat and wear, maintaining the stainless steel’s shiny, like-new appearance.
Performance Validation: Lab & Real-World Testing
Thermal Shock Resistance
- Test: 135 cycles of 400°C dry burning followed by cold water quenching.
- Outcome: No visible change to color, and the shiny finish remains intact.
- Importance: This shows resistance to sudden temperature changes during cooking or cleaning.
Résistance aux hautes températures
- Test: Exposure for 30 minutes at 1100°C (well above normal cooking temperatures).
- Results: No chalking, peeling, or structural failure. Slight graying observed, but adhesion remained strong.
- Application Insight: This makes it perfect for induction stovetops and searing food at very high heat.
Durability Metrics of Dual-Nanoceramic Coating
- Salt Spray Test: 500 hours tested, no corrosion observed, exceeding industry standards.
- Abrasion Resistance: 2,134 cycles on the 3M 7447 dust pad with a weight loss of only 10 mg.
- Chemical Resistance: Withstood 12 hours of deep drying in 5% salt water and 8 hours of detergent testing.
- Non-stick Durability: Successfully complete five egg-cooking cycles at temperatures between 170–190°C
- FDA Certification: According to company testing, extractables are ≤18 mg/in², which is more than 100 times lower than the regulatory limit.
Technical Specifications & Application Guide
Material Compatibility
- Metals: Stainless steel, carbon steel, aluminum, titanium alloy.
- Substrates: Cookware bodies, lids, handles, and heat-affected parts.
Application Process
- Surface Preparation: Clean and degrease the substrates completely. Wear gloves to prevent contamination.
- Primer Application: Disperse through a 0.35mm nozzle at 2–4 bar pressure, ensuring an even 1 μm thickness.
- Topcoat Application: Mix components A and B (screened through 400+ mesh), spray with a 0.8–1.0 mm nozzle for coverage of ≤10 microns.
- Curing: Bake at 230–250°C for 20–30 minutes. Allow to cool to room temperature before use.
Storage & Handling
- Shelf Life: 3 months at 5–25°C storage temperature.
- Application Tip: Use separate tools for each layer to avoid cross-contamination.
Why Dual Nano Ceramic Coating Protection is Better Than Competitors
| Fonctionnalité | Dual-Nanoceramic | Conventional Coating |
| Thermal Stability | 400–800°C | Max 300°C |
| Respect de l'environnement | Zero VOCs, water-based | Solvent-based (toxic fumes) |
| FDA Compliance | Yes (21 CFR 175.300) | Often non-compliant |
| Abrasion Resistance | 2,134+ cycles | <500 cycles |
| Thermal Shock Testing | 135 cycles, no failure | 10–20 cycles, failure |
Findings
The dual-nanoceramic coating is the latest innovation in metallic non-stick technology. Extensive product testing and development have shown that it completely solves the long-standing problems of yellowing, peeling, and toxic vapor emissions. It integrates molecular-level oxidation prevention with surface-level thermal and chemical resistance.
Advantages for Producers and Sellers
- Durability & Longevity: Pots can last for decades, even with heavy use in both professional and home kitchens.
- Compliance: Meets FDA food-contact regulations.
- Customer Satisfaction: Retains its perfect look for longer, even when exposed to outdoor elements like the sun, without cracking or fading.
Ready to be the next wave in your product line? Partner with us to bring dual-nanoceramic coatings to your product line. Contact us to learn how your brand can become a leader in high-quality, long-lasting cookware.
About us
Purecook est un fabricant professionnel d'ustensiles de cuisine, we provide ustensiles de cuisine en gros services and custom cookware solutions to global brands and retailers. Every piece of Purecook cookware contains exquisite craftsmanship and 30 years of silent innovation.
From customized OEM and ODM solutions to factory direct sales services, Purecook is the first choice for global cookware wholesalers, retailers and cooking brands.
We are not just a cookware manufacturer, but also a solid partner behind the global kitchen. Our cookware is sold all over the world, connecting the deliciousness and temperature of the world through our cookware.
