EN 1670 Grade 5 Corrosion Resistance: 480-Hour Neutral Salt Spray Testing
Engineering Overview: Engineering guide on EN 1670 Grade 5 corrosion testing for architectural door lock cylinders in severe marine and coastal environments.
Technical & Engineering Specifications
| Standard | EN 1670:2007 (Corrosion Resistance of Building Hardware) |
|---|---|
| Application | Coastal Facades, Marine Environments, Offshore Facilities |
| Rating Grade | Grade 5 (Exceptionally High Resistance) |
| Salt Spray Exposure | 480 Hours Neutral Salt Spray (NSS) |
Marine Environment Corrosion Testing
EN 1670 evaluates the corrosion resistance of building hardware through accelerated Neutral Salt Spray (NSS) chamber testing across Grades 1 through 5.
Grade 5 Highest Corrosion Benchmark
- Exposure Duration: Continuous 480 hours (20 days) in a 5% NaCl salt spray chamber at 35°C.
- Acceptance Criteria: Zero red rust, pitting, or blistering on functional surfaces; operational turning torque must remain $<1.5 ext{ N}\cdot ext{m}$.
- Recommended Finishing: Solid brass substrates with multi-layer PVD coating or heavy hard chrome plating.
Frequently Asked Engineering & Selection Questions
Q1: What is EN 1670 Grade 5 corrosion resistance?
It is the highest corrosion rating, requiring hardware to survive 480 hours in continuous salt spray without corrosion or functional degradation.