Core Technical Features
Multi-layer Anti-corrosion Barrier: Dacromet adopts zinc-aluminum flake inorganic composite protection; Ruspert features a zinc-passivated base plus ceramic polymer topcoat, delivering physical barrier, sacrificial protection and self-healing properties.
Zero Hydrogen Embrittlement: Non-electrolytic coating process eliminates acid pickling and hydrogen absorption, fully safe for Grade 8.8, 10.9 and 12.9 high-strength structural fasteners.
Superior Climate & Acid Resistance: Delivers 500–1500 hours ASTM B117/ISO 9227 salt spray resistance and 10–20 cycles DIN 50018 SO₂ acid corrosion resistance, ideal for coastal, humid and industrial polluted environments.
Mixed-Material Compatibility: Prevents galvanic corrosion when fastened to aluminum profiles, zinc-coated steel and ACQ/CA-B pressure-treated timber, maintaining long-term structural joint stability.
Stable Mechanical Performance: Flexible coating resists cracking and peeling during high-torque installation and thread forming. Controlled friction coefficient (0.12–0.18) ensures consistent clamping load for structural connections.
Ultra-Thin Precision Coating: 5–18μm thin coating preserves standard thread tolerances, avoiding thread damage and over-tapping issues common with hot-dip galvanized fasteners.
Clear Technical Parameter Table
Parameter / Metric | Dacromet Fastener System | Ruspert Coated Screw System | Testing Standard |
|---|---|---|---|
Coating Architecture | Zinc-aluminum flake inorganic matrix | 3-layer ceramic & organic polymer composite | ISO 10683 / ISO 12944 |
Coating Thickness | 5–12 μm | 10–20 μm | ISO 2178 |
NSS Salt Spray Resistance | 500–1200h (No Red Rust) | 1000–1500+h (No Red Rust) | ASTM B117 / ISO 9227 |
DIN 50018 Kesternich Test | 10–12 cycles | 15–20 cycles | DIN 50018 SFW 2.0S |
Hydrogen Embrittlement Risk | Zero risk | Zero risk | ISO 15330 / ASTM F1941 |
Friction Coefficient | 0.12–0.15 | 0.14–0.18 (customizable) | ISO 16047 |
Continuous Temp Resistance | Up to 300°C | Up to 200°C | ASTM E1354 |
Color Options | Silver / Grey Metallic | Silver, Grey, Black, Bronze, Custom RAL | ISO 11664 |
Product & Coating Performance Comparison
Performance Metric | Electro Zinc (EG) | HDG | Dacromet | Ruspert |
|---|---|---|---|---|
Coating Thickness | 3–8 μm | 45–85 μm | 6–10 μm | 12–18 μm |
ASTM B117 Salt Spray | 24–96h | 300–500h | 500–1200h | 1000–1500+h |
DIN 50018 Acid Test | <2 cycles (fail) | 3–5 cycles | 10–12 cycles | 15–20 cycles |
Hydrogen Embrittlement Risk | High | Moderate | Zero | Zero |
Thread Tolerance | Excellent | Poor (over-tapping needed) | Excellent | Excellent |
Galvanic Isolation | Poor | Moderate | Good | Superior |
Cost Performance | Low cost, short lifespan | High cost, heavy thread loss | Mid cost, high performance | Best lifecycle ROI |
Global Construction Application Scenarios
Dacromet and Ruspert are high-grade multi-layer anti-corrosion coating systems engineered for long-lasting structural fastener performance, widely adopted in global modular construction, coastal projects, industrial facilities and solar mounting systems.
CFS & Light Steel Framing: Ruspert-coated self-drilling screws cleanly penetrate 0.75–3.0mm light gauge steel without coating peeling, eliminating hidden corrosion gaps for residential and commercial cold-formed steel framing systems.
Modular & Prefab Construction: Anti-corrosion structural fasteners withstand transportation vibration and long-term outdoor exposure, lowering maintenance costs for off-site prefabricated and container buildings.
Coastal Marine Environments: Suitable for ISO 12944 C4/C5 high-corrosion marine zones, protecting exterior cladding, curtain walls and roofing systems from sea salt spray and humid fog corrosion.
Industrial & Polluted Zones: Multi-layer barrier structure resists SO₂ acid erosion, perfect for chemical plants, agricultural bases and high-pollution urban construction scenarios.
Solar & Exterior Roofing Systems: Effectively isolates bimetallic corrosion between steel and aluminum components, resisting UV aging and thermal fatigue for long-term solar mounting and exterior metal roofing projects.
E-E-A-T Factory & Quality Advantages
EC Fastener is a professional anti-corrosion fastener manufacturer located in the Nantong Yangtze River Delta industrial hub, with 25 years of cold forging and precision coating experience, delivering E-E-A-T verified fastener solutions for global engineering and retail clients.
Precision Automated Production: Equipped with fully automated dip-spin coating lines, precision cold-heading equipment and computerized heat treatment systems to ensure stable coating thickness, consistent friction performance and batch repeatability.
In-House Full-Spec Lab Testing: Every production batch undergoes strict ASTM B117 salt spray, DIN 50018 Kesternich acid corrosion, XRF coating thickness and ISO 16047 torque-friction tests to guarantee standardized mechanical and anti-corrosion performance.
Complete Traceability & Certification: Supports full material heat number tracking, supplied with EN 10204 3.1 MTC factory certificates and batch-specific test reports. Fully compliant with ISO 9001, ISO 14001, CE, REACH and RoHS standards.
Global Qualified Supplier: Long-term certified supplier for international construction contractors and global retail chains, passing rigorous third-party factory audits, quality verification and technical qualification reviews.