Hard hat colours and what they mean, plus EN 397 markings, date stamps, service life and fit

Common colour schemes: Build UK and an example table

Build UK, the construction industry body, published its Safety Helmet Colours Standard in 2016 and reviewed it in 2023. It uses four colours: white for site managers, competent operatives and vehicle marshals; black for supervisors; orange for slingers and signallers; and blue for everyone on site not doing one of those roles. Vehicle marshals wear a different coloured hi-vis vest so they stand apart from other white helmets. First aiders and fire marshals are identified by green and red helmet stickers rather than by helmet colour, and every helmet must meet BS EN 397, BS EN 12492 or BS EN 14052.

Clients have taken it up as well. Highways England, now National Highways, told its construction and maintenance sites that use a colour code to follow the scheme from 1 January 2017, with blue reserved for inexperienced people and visitors. Network Rail allows only white and blue helmets on its infrastructure. Even within one country, two clients' rules can differ.

The third column below is an example for a site that has no scheme yet, for instance a project outside the UK. It keeps Build UK colours where the roles overlap and uses yellow for general operatives and blue for electricians, a pairing that appears in many supplier colour charts. Count the helmets already in the store by colour before adopting it; a new scheme that clashes with old stock causes confusion in the first week.

Visitors, trainees, safety advisers and electricians: separating roles and writing it down

A colour code only works if everyone reads it the same way. Write it into the site rules as a table, put it on the board at the gate and show it with sample helmets at induction. HSE's first suggestion for making sure head protection is worn is to make it a site rule, and the colour code belongs in the same rule. Highways England went a step further: under its 2016 guidance, the site induction decides, after assessing each person's experience, who gets a blue helmet.

Visitor helmets need their own arrangements. Ten helmets at the gate can pass over dozens of heads in a day. Directive 89/656/EEC, the EU directive on the workplace use of PPE, treats PPE as personal in principle and requires appropriate measures against health and hygiene problems whenever an item has to be shared. Replaceable sweatbands or thin disposable liners approved by the helmet manufacturer are the practical answer. Do not give visitors the engineer's colour: a stranger in a white helmet gets taken for someone in charge.

Giving electricians blue helmets makes the team easy to spot; it does not insulate anyone. For live or near-live work, what counts is the EN 50365 marking on the shell: the double triangle symbol, the voltage and the design type. Such helmets have no conductive parts and no openings that would weaken the insulation. The same logic applies to a safety adviser in green. The colour makes them easy to find in a crowd, it gives them no authority. For trainees and new starters, keeping the team colour and adding a clear, manufacturer-approved label at the back flags them for supervision without adding yet another colour.

One warning: separating subcontractors by helmet colour breaks a role-based scheme quickly. Once colours start to vary by company, nobody can tell whether orange means a signaller or a particular subcontractor. Use vest colour and back printing for the company, and keep helmet colour for the role.

Types of hard hat and their standards: EN 397 Type 1 and Type 2, EN 14052, EN 12492, EN 50365, EN 812

EN 397 is the core standard for industrial helmets. CEN approved the new edition on 14 March 2025, and EN 397:2025 replaced the 2012+A1:2012 edition. Commission Implementing Decision (EU) 2026/1279 of 12 June 2026, published in the Official Journal on 16 June 2026, listed it with its corrigendum as a harmonised standard. Presumption of conformity under the old edition ends on 16 December 2027, so helmets certified to both editions will share sites for a while.

The biggest change is two types. Type 1 is tested like the old EN 397, for crown impacts only: in a 49 J impact the force transmitted to the headform must not exceed 5.0 kN. Type 2 is also tested with a 98 J crown impact and 24.5 J impacts to the front, rear and sides, with a 10.0 kN limit in both tests. Type 2 must have a chin strap that does not release below 500 N. On Type 1 the strap is optional; if fitted, it must be at least 10 mm wide and must not release below 150 N.

The other standards serve different jobs. EN 14052 covers high performance industrial helmets, adding more protection from falling objects, off-crown impact protection, a flat blade penetration test and chin strap strength and effectiveness. EN 12492 is the mountaineering helmet standard, harmonised in its 2025 edition by the same decision, and is favoured where there is a risk of swinging and impacts from any direction, as in rope access. EN 50365:2023 covers electrical insulation only, for live or near-live work on installations up to 17,000 V AC or 1,500 V DC; mechanical protection has to come from a standard such as EN 397. EN 812 covers bump caps, which protect against striking a fixed object and give no protection from falling ones.

In the US, ANSI/ISEA Z89.1 sorts helmets differently: Type I for top impacts, Type II for top and lateral impacts, and Classes G, E and C for electrical performance. Class G is proof-tested at 2,200 V, Class E at 20,000 V, and Class C offers no electrical protection. None of these is shown by colour either.

EN 397 markings: what is moulded inside the shell?

Markings are moulded or impressed into the shell. Under EN 397:2012+A1:2012, every helmet carries the standard number, the manufacturer's name or identification mark, the year and quarter of manufacture, the model designation, the size range in centimetres and the abbreviation for the shell material. Model and size appear on both the shell and the harness. The CE mark comes from the PPE Regulation.

Optional markings show conditions the manufacturer has had the helmet tested for. No marking means no test. On a winter site where temperatures drop to -25 °C, look for the -30 °C mark; a helmet marked only -20 °C has not been tested that cold.

The 2025 edition changed the list. The lateral deformation (LD) test and the 440 V a.c. option were removed, and any electrical insulation claim now refers to clause 4.3 of EN 50365:2023. New optional requirements cover electrostatic properties, enhanced visibility and resistance to off-crown penetration. For low temperature, manufacturers can declare a value in 10 °C steps, so marks such as -40 °C may appear on new helmets. The edition and type a helmet is certified to are shown by the standard reference on the shell, the user instructions and the EU declaration of conformity.

Where is the date stamp on a hard hat, and how do you read it?

The date of manufacture is a small dial moulded into the plastic inside the shell, not a sticker. It is often under the peak; on other models it sits on an inside side wall or on the rim. The number in the centre is the year, usually its last two digits, so 25 means 2025. If the numbers 1 to 12 run round the edge, the arrow points to the month. On a four-part mark, an arrow or a raised dot shows the quarter instead.

Example: the centre reads 25, the arrow points at 3 and the numbers 1 to 12 run round the edge. The helmet was made in March 2025. On a four-part mark with the third part marked, it would date from the third quarter of 2025, July to September. If the mark is unclear, check the instructions; the manufacturer has to explain every marking there.

This is not an expiry date. Regulation (EU) 2016/425 says that where ageing is known to affect the performance of PPE significantly, each item must be indelibly marked with its month and year of manufacture and/or, if possible, the month and year of obsolescence. Hard hats usually carry only the manufacture date, and the service life is in the instructions.

The harness is a separate part and may not have been made in the same month as the shell. When fitting a replacement harness, check that its model and size range match those on the shell. Do not mix shells and harnesses from different manufacturers; the Canadian Centre for Occupational Health and Safety (CCOHS) lists this among the things not to do.

Service life and expiry: when does a hard hat need replacing?

There is no single legal lifespan. Annex II of Regulation (EU) 2016/425 requires the manufacturer's instructions to give, where applicable, the month and year or period of obsolescence of the PPE or its components. Neither OSHA's head protection rules nor HSE's construction PPE guidance set a number of years. On the employer's side, Directive 89/656/EEC requires PPE to be kept in good working order through the necessary maintenance, repair and replacement. The manual sets the limit; keeping track of it is the employer's job.

Manufacturers' figures vary widely. In three EN 397 helmet manuals we checked, the limits were 7 years from manufacture; 5 years in use or 10 years from manufacture, whichever comes first; and up to 5 years in the original carton, in the dark and between 0 and 30 °C, followed by up to 5 years of use counted from the day the helmet is issued. Two helmets made in the same month can therefore be due for replacement years apart, depending on the model and the time spent in storage.

Some conditions end a helmet's life early. The standard warning in EN 397 user information explains that the shell and harness absorb the energy of a blow by being partly destroyed or damaged, and that this damage is not always visible; a helmet that has taken a severe impact is replaced. Sunlight, heat and chemicals age the plastic: CCOHS describes a dull colour, a chalky surface and a pattern of tiny cracks. Heat and UV make the shell brittle, so helmets should not ride behind a car's rear window. Solvents, thinners and paint can attack the shell. Manufacturers recommend warm soapy water and a soft cloth for cleaning, and a helmet that will not come clean that way is replaced.

Check the helmet before every use. OSHA's 2009 interpretation letter lists what to look for: dents, cracks and penetration, and damage caused by impact, rough treatment or wear. In practice, go through it in this order:

• Shell: cracks, dents, holes or deep scratches
• Surface: dullness, chalking, a web of fine cracks
• Holes drilled later, paint, marker pen or labels the manufacturer has not approved
• Harness: torn or frayed straps, broken clips, cracked adjustment slots
• Close the rear adjuster and let go: the ratchet or strap should hold its setting
• Chin strap: cuts, wear, whether the buckle locks
• The standard, size and date markings should still be legible

How to wear and adjust a hard hat

Set the harness first, then put the helmet on. Open the rear adjuster fully and seat the helmet with the peak forward and the shell level, neither tipped onto the forehead nor sliding back onto the neck. The height positions on the harness straps decide how high the shell sits above the head. The gap the harness keeps between head and shell is where the impact is absorbed.

Then close the rear adjuster until the helmet sits firmly without pinching. Nod and turn your head from side to side: if the helmet does not shift, leaves no mark on the forehead and causes no headache after a few minutes, the fit is right. EN 397:2025 requires size adjustment that is continuous or in steps of no more than 5 mm, and an ergonomic test in which the helmet has to stay in place while the test subject moves.

A chin strap is mandatory on Type 2 and optional on Type 1. Run it under the chin and close the buckle; it should be snug but should not bother you when you talk or swallow. On helmets certified to the 2012 edition, the strap anchorage is tested to release between 150 and 250 N, mainly to reduce the risk of strangulation if the helmet snags. Where the helmet has to stay on during a fall, choose Type 2 or an EN 12492 helmet, whose straps are built to hold.

Wear the peak forward. Reversing the helmet is acceptable only if the manufacturer says so and the harness is turned so the nape strap stays at the back of the head. In the US, OSHA accepts a reversed hard hat when the manufacturer certifies that use, and ANSI Z89.1-2009 contains provisions for testing it. Fit ear defenders or a face shield only if the manufacturer lists them as compatible with that helmet. Under EN 397:2025, a helmet submitted for testing with such items must pass with and without them, and the manufacturer has to list the accessories that do not affect conformity.

Logos, name labels and what to specify when ordering

EN 397 user information carries a second standard warning, this one about paint, solvents, adhesives and self-adhesive labels: none should be applied unless the helmet manufacturer's instructions allow it. The decision therefore sits with the manufacturer. Which label, where on the shell and with which adhesive should be in the instructions or in written approval. OSHA's interpretation letter of 27 October 2009 draws a similar line in the US: paint and stickers are acceptable if the manufacturer authorises them or the employer can show the helmet's reliability is unaffected, and they must not hide damage during inspection. The letter gives see-through stickers as the example.

A company logo is best printed by the helmet manufacturer, with inks suited to the shell material, so approval is settled from the start. If name or role labels will be added later, ask the manufacturer which label type and position it accepts. For identification at a distance, CCOHS suggests making numbers or symbols with reflective tape instead of painting the shell, and checking any tape or sticker with the manufacturer first; on night shifts the same tape adds visibility. Buy from a reputable supplier too: HSE warns that fake hard hats are on the market.

When you ask Formasan for a hard hat quote, list colours by role, for example 8 white, 4 black, 2 orange, 60 yellow, 10 blue, 2 green and 15 visitor helmets that rotate at the gate. With the details below, the right model and accessories can be matched in one go:

• Standard and type: EN 397:2025 Type 1 or Type 2; EN 50365 class if there is electrical work
• Optional requirements: low or high temperature, molten metal (MM)
• Colour and quantity per role
• Size range and adjuster type: ratchet wheel or stepped strap
• Chin straps, spare sweatbands and replacement harnesses
• Ear defenders and face shields to be fitted to the helmet
• Logo and name labels: position, size, quantity
• User instructions in the language of the country of use and the EU declaration of conformity