Overview
Solar lighting fixtures spend their entire service life exposed to sunlight, moisture, and atmospheric pollutants. Our UV & Corrosion Resistance testing program accelerates years of environmental exposure into months, ensuring that materials, coatings, and components maintain their integrity and appearance over the product’s 10+ year lifespan.
UV Accelerated Weathering Test
Equipment: QUV Accelerated Weathering Tester
| Parameter | Test Condition |
|---|---|
| Lamps | UVA-340 (simulates sunlight 295-365nm) |
| Irradiance | 0.89 W/m² at 340nm |
| Cycle | 8h UV at 60°C → 4h condensation at 50°C |
| Duration | 3,000 hours (≈5 years Florida equivalent) |
Evaluation Criteria
- Color change: ΔE < 3.0 (measured by spectrophotometer)
- Gloss retention: >60% of original value
- Chalking: Rating ≥ 8 (ASTM D4214 scale)
- Cracking: No visible cracks at 10x magnification
- Impact strength: >80% of original (for plastic components)
Salt Spray Corrosion Test
Equipment: Salt Spray Chamber (per ASTM B117)
| Parameter | Test Condition |
|---|---|
| Solution | 5% NaCl, pH 6.5-7.2 |
| Temperature | 35°C ± 2°C |
| Duration | 1,000 hours (for coastal deployments) |
| Humidity | 95-100% RH |
Evaluation After Salt Spray
- No red rust on steel components after 500 hours
- No white rust on zinc-plated parts after 1,000 hours
- No pitting or crevice corrosion on aluminum
- Bolt threads remain functional and free of seizure
- Gaskets and seals maintain elasticity and waterproofing
Material Selection for Corrosion Resistance
- Fasteners: SUS316 stainless steel (marine grade)
- Pole: Hot-dip galvanized steel + powder coating (dual protection)
- Enclosure: Die-cast aluminum (ADC12) with chromate conversion coating
- Seals: EPDM rubber (UV and ozone resistant)
- Cables: XLPE insulation (UV resistant, -40°C to +125°C)
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