AS/NZS 4399:2017
Working outdoors exposes professionals to more than heat and weather — ultraviolet (UV) radiation is a constant hazard. Overexposure increases the risk of skin damage, burns, and long-term health issues such as skin cancer. The AS/NZS 4399:2017 standard sets out how protective clothing should be tested, rated, and labeled to safeguard workers from harmful UV rays.
This standard applies to garments specifically designed to reduce UV radiation transmission through fabric, giving workers a measurable level of protection.
Scope of AS/NZS 4399:2017
AS/NZS 4399 covers:
- Clothing fabrics designed to block UV radiation
- Requirements for labeling and classification
- Test methods for UV protection
It does not cover:
- Sunscreen products (regulated separately)
- Eye or face protection (covered under other standards)
- Heat stress or infrared radiation hazards
Understanding UPF Ratings
Clothing tested under AS/NZS 4399 receives an Ultraviolet Protection Factor (UPF) rating. This indicates how much UV radiation penetrates the fabric. For example, UPF 50 means that only 1/50th of UV radiation passes through.
Comparison Table: UPF Ratings
| UPF Rating | UV Radiation Blocked | Protection Category |
|---|---|---|
| UPF 15–24 | 93.3%–95.9% | Good protection |
| UPF 25–39 | 96.0%–97.4% | Very good protection |
| UPF 40–50+ | 97.5%–98%+ | Excellent protection |
UPF 50+ is the highest rating and represents the best protection available under the standard.
Labeling Requirements
Garments compliant with AS/NZS 4399 must display:
- The UPF rating (e.g., UPF 50+)
- Coverage information (which body parts the garment protects)
- Fabric composition and care instructions
This ensures that users know the exact level of UV protection offered.
Importance of AS/NZS 4399
UV exposure is not just a leisure hazard — it is a major occupational risk.
- Maritime & Offshore: crews working long hours on deck under direct sunlight.
- Petrochemical: outdoor maintenance and inspections in sun-exposed areas.
- Construction: workers exposed to full-day UV radiation on open worksites.
Clothing certified under AS/NZS 4399 provides measurable protection, reducing the risks associated with long-term UV exposure.