Flame Retardant Workwear: The Complete UK Buying Guide

Flame retardant workwear is not a niche category - it covers everyone from welders and gas engineers to electricians working near arc flash risk, oil and gas workers, and utility contractors. The range of environments requiring FR clothing is broad, and the standards governing what counts as compliant protection vary significantly depending on the specific hazard. This guide explains what the standards actually mean, what the different types of FR garment cover, and how to match the right protection to the actual risk.

Standard workwear fabrics, including most polyester and polycotton blends, will melt, burn, and continue burning if exposed to ignition sources. For workers in environments with flash fire risk, welding spatter, molten metal splash, or arc flash, a garment that continues to burn after the ignition source is removed is a serious secondary hazard - it extends the burn duration and severity beyond the initial incident.

Flame retardant workwear is designed to do two things: resist ignition in the first place, and self-extinguish quickly if it does ignite. The garment does not make the wearer fireproof, but it significantly reduces the severity of burns in incidents that would otherwise cause catastrophic injury from continued burning fabric.

This is why FR workwear is classified as PPE under UK regulations and must be appropriate to the specific risk being controlled. The employer carries the responsibility under the Personal Protective Equipment at Work Regulations 2022 to provide PPE matched to the assessed hazard - and for many environments involving ignition sources, standard workwear is simply not compliant.

The principal standard for protective clothing against heat and flame hazards. EN ISO 11612 covers protection against convective heat, radiant heat, molten metal splash (both aluminium and iron), and contact heat. Garments certified to this standard will carry a code indicating which specific performance tests they have passed:

• A1/A2: Limited flame spread (the foundational test - the garment must self-extinguish)
• B: Convective heat
• C: Radiant heat
• D: Molten aluminium splash
• E: Molten iron splash
• F: Contact heat

For welding applications, EN ISO 11612 with the A, B, and D/E ratings is typically the baseline requirement. For oil and gas environments, A, B, and C ratings are standard.

A lower-tier standard than EN ISO 11612, covering garments that provide limited flame spread protection without the full thermal performance requirements. Index 1, 2, and 3 classifications indicate increasing levels of protection. EN ISO 14116 Index 3 is suitable for environments where incidental flame exposure is a risk but sustained thermal hazard is not the primary concern - some utilities work, hot work supervision, and environments adjacent to flame risk rather than directly in it.

Arc flash is a distinct hazard from general heat and flame. An electrical arc releases enormous energy in milliseconds - the incident energy can cause severe burns through standard FR workwear that would otherwise handle welding environments adequately. Arc flash protection is measured in calories per square centimetre (cal/cm²), and garments must be rated to a specific arc thermal performance value (ATPV) that exceeds the potential incident energy at the work location.

Arc flash rated garments will specify their ATPV rating and the arc flash Class (1 or 2 under EN 61482-2). Class 2 provides higher protection than Class 1. For electrical maintenance and switchgear work, the arc flash risk assessment determines the required ATPV - this is not something to estimate from a general standard.

DSEAR is not a product standard but a UK regulatory framework that governs workplaces with flammable substances and explosive atmospheres. In DSEAR-controlled environments (fuel depots, chemical processing, certain pharmaceutical sites), the FR specification required for clothing is typically defined by the site's own risk assessment, which will reference one or more of the EN standards above.

This distinction matters for long-term performance and is worth understanding before buying.

Treated FR fabrics are standard synthetic or cotton fabrics that have been treated with a chemical flame retardant finish during manufacturing. The treatment provides the FR properties. The limitation is that the treatment can be degraded over time by repeated washing at high temperatures, certain detergents, and fabric softeners. Treated FR garments typically carry a care label specifying maximum wash temperature and prohibiting fabric softener use for this reason. Their FR performance is not permanent.

Inherent FR fabrics are made from fibres that are flame retardant by their molecular structure - the protection is built into the material itself and cannot be washed out or chemically degraded. Fabrics like Modaflame, Nomex, Proban-treated cotton (where the treatment is part of the fibre rather than a surface finish), and similar technical fabrics fall into this category. Inherent FR garments typically retain their FR properties for the working life of the garment.

For environments requiring sustained, reliable FR protection - oil and gas, arc flash environments, DSEAR sites - inherent FR fabrics are the appropriate specification. For lower-frequency FR requirements, well-maintained treated FR garments are adequate provided the care instructions are followed.

The Portwest Modaflame range uses inherent FR fabric; the Portwest Bizweld range uses treated cotton. Both are legitimate FR garments for their respective applications.

The most straightforward FR garment - a single-piece garment providing full-body coverage from neck to wrist and ankle. FR coveralls are standard in welding, oil and gas, and chemical environments where the simplicity of a single garment is preferred over coordinating separate FR top and trousers.

The Portwest Bizweld range dominates the welding coverall market - the BIZ1 welder's coverall is one of the most widely used FR garments in UK workshops. The Portwest FR21 provides inherent fabric construction for higher-specification requirements. The FR53 heavyweight insulated coverall covers cold-weather FR environments.

The flame retardant coveralls range covers the main options.

Separate FR trousers allow the FR protection to be combined with different upper garments and are practical for environments where partial FR protection is required or where layering flexibility is needed. FR trousers typically meet EN ISO 11612 A1/A2 and are specified to match the upper FR garment's performance.

The Portwest FR36 Bizflame Pro Trousers and Beeswift Proban FR trousers cover the main options at different price points.

FR jackets and coats for environments where the FR protection needs to be in the outer layer. The Portwest FR34 lightweight FR coat covers warehouse and light industrial environments. For hi-vis combined with FR protection, the Portwest S773 Bizflame waterproof bomber jacket provides FRAS (Flame Retardant Anti-Static) specification in a waterproof outer layer.

For highway, rail, and utility environments where both EN ISO 20471 hi-vis compliance and FR protection are required simultaneously. Standard hi-vis garments are not FR rated; standard FR garments may not be hi-vis rated. Combined hi-vis FR garments must meet both standards and will be certified to both.

The Portwest S780 Bizflame hi-vis FR bib trouser (RIS 3279 compliant for rail environments) and MV28 arc flash coverall with hi-vis are examples of combined specification garments for these environments.

The hi-vis flame retardant workwear range covers combined FR and hi-vis options.

In arc flash environments and some oil and gas applications, the FR requirement extends to the base layer. A standard cotton or synthetic base layer under an FR outer garment can still ignite and cause severe burns if the outer garment is breached. FR base layers - FR long johns, FR t-shirts, FR long-sleeve tops - provide protection throughout the layering system.

The Portwest FR11 inherent FR long-sleeve t-shirt and FR14 FR antistatic base layer leggings cover the main base layer requirements.

This is the part that most generic FR workwear content gets wrong: the correct FR specification depends entirely on the actual hazard, not on a general "get FR workwear" instruction.

Primary hazards: welding spatter, spark exposure, UV radiation from arc. Required standard: EN ISO 11612 with A1/A2 (flame spread) and D/E (molten metal splash) ratings. The Portwest Bizweld range is specifically designed for welding environments and widely used across UK fabrication shops. Leather welding gloves from the welding gloves range complete the hand protection requirement.

Cotton and leather are the traditional materials for welding FR workwear - they resist melting under spatter in a way synthetic fabrics do not.

Primary hazards: flash fire risk from gas ignition, spark exposure. Required standard: EN ISO 11612 A1/A2/B/C for environments with flash fire risk. For gas engineers working on gas mains and distribution, the specific network operator requirements may specify garment type and standard - check the relevant network's PPE requirements.

Primary hazard: arc flash incident energy. Required standard: EN 61482-2 arc flash protection to a specific ATPV rating determined by arc flash risk assessment. The rating required varies by the electrical system voltage and configuration - a low-voltage distribution board has a different incident energy profile than a high-voltage substation.

Do not assume standard FR workwear is adequate for arc flash environments. A welding coverall meeting EN ISO 11612 may not meet the arc flash energy rating required. The Portwest MV28 arc flash coverall (tested to 12 cal/cm² and above) is an example of a dedicated arc flash garment.

Primary hazards: flash fire, DSEAR-controlled atmospheres. Required standard: inherent FR fabric meeting EN ISO 11612 across A, B, and C ratings. Combined anti-static properties (FRAS - Flame Retardant Anti-Static) are typically required in explosive atmosphere environments where static discharge is a secondary ignition risk. The Portwest FR21 and FR53 coveralls and the Tranemo and Pulsar ranges stocked cover these specifications.

For utility workers combining hi-vis requirements with FR environments - overhead line work, rail trackside work with traction power - combined EN ISO 20471 and EN ISO 11612 or arc flash garments are required. The hi-vis FR range covers these combined specifications.

FR garment care is not optional maintenance - it directly affects the protection the garment provides.

• Washing temperature: Most treated FR garments have a maximum wash temperature, typically 40-60°C. Exceeding this temperature degrades the FR treatment. Check the care label and follow it.
• Detergents: Optical brightening agents (OBAs) in standard laundry detergents can significantly reduce the FR performance of treated garments. Use a detergent specifically approved for FR workwear, or a detergent without OBAs.
• Fabric softener: Never use fabric softener on FR workwear. It coats the fibres and significantly reduces FR performance. This applies to both liquid fabric softener and dryer sheet products.
• Repairs: Damaged FR garments - tears, holes, worn areas - reduce protection at the point of damage. FR garments should be repaired using FR fabric patches and FR-rated thread, or replaced. A non-FR patch on an FR garment creates a vulnerability exactly where the garment has been damaged.
• Service life: FR garments have a finite service life. Most manufacturers specify a maximum number of wash cycles or a time limit after which the garment should be replaced regardless of visible condition. Follow the manufacturer's guidance - this is particularly important for treated FR garments where the FR treatment degrades with each wash.
• Inspection: Before each use, FR garments should be inspected for contamination, damage, and condition. Contamination with flammable substances (oil, solvent, fuel) on an FR garment removes its protection at the contaminated area and creates additional fire risk. A contaminated FR garment must be washed before use or removed from service.

No. FR workwear is designed to resist ignition and self-extinguish, limiting the duration and severity of burn injuries in an incident. It does not provide complete protection from fire exposure, particularly sustained or high-intensity flame.

Yes, provided you follow the care label precisely - the correct wash temperature, no fabric softener, and an approved or OBA-free detergent. Industrial laundering services that specialise in FR workwear are available for organisations with large FR workwear fleets and provide consistent compliance with care requirements.

No. Polycotton workwear may seem less flammable than pure synthetic fabrics, but it will still ignite and continue burning once ignited. The self-extinguishing property of FR workwear is the critical safety feature - it is what limits burn severity after initial exposure. Untreated polycotton does not self-extinguish.

For inherent FR fabrics, protection is maintained for the garment's working life unless the garment is physically damaged or contaminated. For treated FR fabrics, protection degrades with washing. The manufacturer's stated wash cycle limit provides guidance. If the garment is within its service life, has been cared for correctly, and is free from damage and contamination, it should be providing the specified protection.

Potentially yes. A welding coverall meeting EN ISO 11612 for molten metal splash may not meet the arc flash energy rating required for electrical switchgear work. If your workers face multiple FR hazards, each hazard requires assessment against the appropriate standard.

The full flame retardant workwear range covers over 400 garments across brands including Portwest, Pulsar, Tranemo, Blaklader, and Beeswift. For specific product types, the FR clothing range covers standard FR garments, the hi-vis flame retardant range covers combined hi-vis and FR options, and the flame retardant coveralls range covers full-body FR one-piece garments. For welding hand protection to complete your FR setup, the welding gloves range covers the hand protection requirement.