Portwest FR451 PW3 Modaflame Work HVO Class 1 FR Trousers

Portwest FR451 PW3 Modaflame Work HVO Class 1 FR Trousers

The Portwest FR451 PW3 Modaflame HVO Trousers deliver reliable multi-norm flame resistant protection, combined with modern workwear flexibility and comfort. Constructed using inherent Modaflame stretch fabric and reinforced at key wear zones, these Class 1 hi-vis FR trousers offer certified protection against heat, flame, arc flash, and chemical splash — ideal for energy, rail, utilities, and ATEX-risk environments.

Designed for movement and durability, the FR451 features triple-stitched seams, top-loading kneepad pockets, and innovative stretch panelling. With 8 functional pockets including an easy-access multiway thigh pocket, these trousers provide maximum utility, comfort, and compliance in demanding environments.

Key Features

• Multi-norm flame resistant hi-vis trousers – Class 1 visibility and CE-CAT III certified

• Inherent Modaflame stretch fabric – arc rated and built to move

• Triple-stitched durability with reinforced panels in high-abrasion zones

• Segmented reflective tape and reflective piping for enhanced visibility

• Top-loading kneepad pockets – compatible with standard inserts

• 8 functional pockets – cargo, rule, back patch, and phone/tool

• Extendable leg length (31" to 33") – size flexibility built in

• Side elastic waist – tailored comfort and flexibility

• Non-metallic – safe for use in ATEX and non-magnetic zones

• 40+ UPF rated fabric – blocks 98% of harmful UV rays

Fabric Composition

• Shell: 60% Modacrylic / 39% Cotton / 1% Carbon Fibre – 280gsm

• Reinforcement: Modaflame Work HVO – 61% Modacrylic / 18% Viscose / 15% Polyester / 5% Aramid / 1% Carbon Fibre

• Stretch Panelling: 60% Modacrylic / 35% Cotton / 4% Elastane / 1% Carbon Fibre – 280gsm

Certified To

• EN ISO 11612 A1+A2, B1, C1, F1 – Flame and heat protection

• EN ISO 11611 Class 1 A1+A2 – Welding and allied processes

• EN 1149-5 – Anti-static

• IEC 61482-2 (Arc Flash)
   • IEC 61482-1-1: ELIM 6.4 CAL/CM², EBT 6.8 CAL/CM²
   • IEC 61482-1-2: APC 1

• EN ISO 20471 Class 1 – Hi-vis

• EN 13034 Type 6 – Chemical splash protection