Portwest FR404 Trousers: Stretch Engineering and Certified Arc Flash Protection

The FR404 trousers represent an evolution in flame-resistant protective clothing by integrating elastic properties into a high-strength fabric. Made with Bizflame Plus Stretch technology, this garment offers certified protection against heat and flame, complying with NFPA® 70E standards. Their design is aimed at professionals operating in electrical and industrial maintenance environments where agility is as critical as safety, allowing unprecedented freedom of movement for garments in their category.

Why is this gear vital for operations?

• Dynamic Mobility (4-Way Stretch): Unlike traditional rigid flame-resistant trousers, the FR404 uses elastic fibers that allow the operator to bend, climb, and move in confined spaces without restriction, reducing physical fatigue and the risk of tears due to tension.
• NFPA® 70E Certified Protection: This garment has been rigorously tested to provide a barrier against arc flash and sudden fire, ensuring that the fabric does not continue to burn after exposure, which provides vital seconds for worker safety.
• Durability and Comfort Management: The high-quality cotton blend ensures superior breathability and softness to the touch, while reinforcements at high-stress points ensure the garment withstands the demands of rough industrial use outdoors and indoors.

Regulatory Compliance Analysis

This product complies with international standards EN ISO 11612, ASTM F1959, and has an arc rating (ATPV) that ensures its effectiveness in classified areas. Its pocket configuration is designed not to interfere with safety harnesses or tool belts, maintaining operational functionality at all times.

• Material: Bizflame Plus Stretch (99% Cotton, 1% Elastane) with flame-resistant finish.
• Ergonomics: Side elasticated waistband and pre-formed knees for a superior ergonomic fit.
• Technical Storage: 8 functional pockets, including top-loading kneepad pockets and a rule pocket.
• Sun Protection: UPF 40+ factor that blocks 98% of UV radiation.