Start With the Hazard, Not the Catalogue

Walk into almost any industrial site and you will see a patchwork of high-visibility vests, coveralls, gloves and aprons. What looks like a uniform is really a series of engineering decisions — each garment chosen, hopefully, against a specific hazard that a risk assessment has already identified. The trouble is that protective clothing is often bought on price or habit rather than on evidence. Understanding a handful of common test methods makes it far easier to specify garments that genuinely match the risks on your shop floor, and to explain those choices to the people wearing them.

Flame, Heat and Molten Metal Hazards

For anyone working near furnaces, welding arcs or hot processes, EN ISO 11612 is the cornerstone. It tests garments for limited flame spread and then adds performance codes for specific heat types: A1 and A2 for limited flame spread under edge and surface ignition, B for convective heat, C for radiant heat, D and E for molten aluminium and iron splash, and F for contact heat. A foundry worker facing molten metal needs D or E performance; someone working alongside a hot pipe run may only need C.

Welding has its own standard, EN ISO 11611, which covers both the garment and the risks of spatter and short-circuit arcs. Where there is a chance of an electrical arc flash, look for EN 61482-2 and its arc rating, expressed as ATPV or ELIM in cal/cm². For lower-risk situations, EN ISO 14116 grades limited flame spread from index 1 to 3, and index 1 garments must always be worn over another layer rather than next to the skin.

One practical point: flame-resistant clothing only works if it is worn and kept as intended. Contamination with oil, grease or solvent can compromise performance, and repairs must use the correct thread and materials.

Chemical Splash, Spray and Vapour

Chemical protective clothing is classified by "Type", a useful shorthand for the level of containment.

• Type 6 (EN 13034) — limited protection against small splashes of liquid chemicals.
• Type 5 (EN ISO 13982-1) — protection against airborne solid particulates, such as powders and fibres.
• Type 4 (EN 14605) — spray-tight suits for liquid aerosols.
• Type 3 (EN 14605) — liquid-tight suits for strong directional jets.
• Type 1 and 2 (EN 943-1) — gas-tight or non-gas-tight suits for vapours and gases.

Type alone is not enough. Permeation testing to EN 16523-1 measures how long a chemical takes to break through the fabric, with results graded from level 1 (over ten minutes) to level 6 (over eight hours). A suit that resists a caustic solution brilliantly might offer almost no protection against an organic solvent, so the material must be matched to the specific substance in use — and to its concentration and temperature.

Mechanical, Cut and Visibility Risks

Gloves carry the familiar EN 388 marking: four digits for abrasion, cut, tear and puncture resistance, plus a letter A to F for the ISO 13997 cut test. That letter matters, because the older Coupe method can give misleading results on materials such as glass fibre and high-performance polyethylene. An T after the cut letter indicates impact protection, useful for handling heavy components.

For site visibility, EN ISO 20471 sets classes 1 to 3 based on the area of fluorescent and retro-reflective material. Class 3 is normally required for higher-speed roads and poor light. Footwear usually follows EN ISO 20345, with codes covering toe caps, penetration resistance and electrical properties.

Layering, Care and Compatibility

Real workplaces rarely present a single hazard. A chemical operator may also work near hot pipework; a maintenance engineer may need cut resistance and arc protection at the same time. Layering is normal, but the order matters. Many chemical suits are not flame retardant, so they should not be worn directly over bare skin in an area with ignition risk — a flame-resistant base layer underneath is usually the sensible arrangement. Anti-static properties, covered by EN 1149-5, also deserve attention where dust or solvent vapour is present.

Standards assume the garment is maintained. Follow the manufacturer's laundering instructions, inspect for damage before each use, and retire items whose retro-reflective tape, coating or seams have deteriorated. A standard printed on a label is a promise about a new garment, not a guarantee about a tired one.

Specifying With Confidence

Start with a written risk assessment. Identify each hazard, note whether it is splash, spray, vapour, radiant heat, cut or impact, then match the standard and performance level to it. Ask suppliers for test reports rather than marketing claims, check that garments carry the correct UKCA or CE marking with the notified body number, and insist on user instructions in English that the wearer can actually follow. Do that, and your protective clothing will quietly do the job it was bought to do — which is exactly what good textile engineering should feel like.