Once winter sets in, goggles across the workshop fog up together. A worker walks back from the cold pre-treatment tank to the grinding station and the lens turns white in a single breath. Helmet buckled, face shield tipped up on the forehead, cut-resistant gloves, long-sleeved workwear, safety shoes — the kit is complete. The problem is the lens: the moment it fogs, instinct takes over, the hand comes up, two wipes through a cotton glove, and the job carries on.

That is wrong. The grit and oil on the glove do not wipe away the fog — they wipe away the lens. When vision goes, the head moves forward and the operator drifts closer to the splash source. GB 14866-2023, General technical specification for eye and face protection, has applied since 1 January 2025: eye and face protection is no longer recommended, it is mandatory.

"Anti-fog" is not a national standard requirement

The revision notes to GB 14866-2023 are blunt. Compared with GB/T 32166.1-2016, the standard deletes liquid droplet protection and lens anti-fog requirements; compared with GB 14866-2006, it deletes chemical droplet protection. The mandatory standard in force contains neither an "anti-fog" index nor a "chemical droplet protection" grade.

First implication: anti-fog cannot serve as an acceptance criterion. Write "anti-fog goggles" into a contract and there is no clause to point to; in a dispute there is nothing to rest the claim on. Anti-fog is a bonus feature, not a compliance item.

The second matters more: because the standard no longer lists chemical liquid splash separately, a chemical splash post cannot be covered by grabbing whatever goggles are on the shelf. Which eyewear a post requires — closed cups, or a full facepiece linked to respiratory protection — follows from GB 39800.1-2020, Specification for the provision of personal protective equipment — Part 1: General provisions (mandatory since 1 January 2022): identify the hazard, select the equipment, trace it to source, then reject and replace. Whether a splash can occur is answered by the chemical safety data sheet.

Inside the vent: the 1.5 mm line

The ventilation opening is the only place on a pair of goggles deliberately left open. It lets fog escape — but an opening is also a passage.

The new standard adds a mandatory requirement for exactly this: clause 8.11, puncture resistance of ventilation openings.

The clause is short: on eye and face protection fitted with a ventilation device, the openings shall prevent a rod 1.5 mm in diameter from entering. Annex E tests it by fitting the sample to a headform and probing every opening in turn with a steel rod 60 mm long, 1.5 mm in diameter, smooth hemispherical tip; the rod shall not contact the protection area applicable to the product or its contour line.

It answers a practical question: how small must a vent be to pass — 1.5 millimetres is the hard line.

Three more clauses to read alongside it

7.1 Luminous transmittance: for products without a filtering effect, transmittance at the reference point shall not be less than 85%. A lens gone yellow or dull is the first to fail.

8.6 Materials and surface quality: within a circle of 30 mm radius centred on the reference point, no surface defect capable of impairing vision may be present — scratches, mould spots, cracks. Wiping a lens with a cotton glove manufactures exactly those scratches.

8.3 High-speed particle impact has three grades: low 45 m/s, medium 80 m/s, high 120 m/s. Spectacles can only be rated low; medium speed calls for goggles and face shields; high speed is face shields only.

And do not overlook 5.3, cleaning and disinfection: how the lens is to be wiped is written in the instructions.

Pitfall 1 — wiping the lens with a glove, a shirt hem or a tissue

Back to the worker at the start. The lens fogs, the hand comes up, two wipes through a cotton glove — the most common move in any workshop and the most destructive one for the lens. Grit in cotton is harder than the coating, and repeated wiping builds a layer of fine scratches. Land those inside the 30 mm circle at the lens centre and clause 8.6 is not satisfied.

The correct sequence: step out of the work position, remove helmet, face shield and goggles in that order; rinse loose dust off with clean water, then wipe with the manufacturer's lens cloth or dedicated cleaner exactly as instructed; let it dry, put the kit back on, fasten the chin strap, return the face shield to position, then go back to the post.

Pitfall 2 — sealing the vents with tape

Another home-grown fix: clear tape over the openings. The fog does reduce — and the fix is wrong. Seal the opening and hot air cannot escape, so fogging gets worse, and the ventilation structure the manufacturer designed is destroyed; the clause 5.3 duty to maintain the product as instructed has nothing left to stand on. If dust gets into a vent, clean it — do not tape it over.

Pitfall 3 — ordinary dust goggles on a chemical splash post

The most dangerous moment at the pre-treatment tank is dosing and sampling. Someone finds the facepiece stuffy, takes off the full facepiece and keeps only dust goggles to lean in and read the level — that is wrong. Ordinary dust goggles carry no liquid splash protection whatsoever.

For posts like this, carry out hazard identification under GB 39800.1-2020 and select equipment on the substance's physical and chemical properties and the splash risk: normally closed cups, a liquid-splash face shield, or a full facepiece combined with respiratory protection, plus safety helmet, chemical-resistant gloves, protective clothing and chemical-resistant footwear. Eyewash equipment must be installed and tested — Chapter 7 of GB/T 38144.2-2019 requires the valve to be opened within 1 s of being located and the affected area flushed for at least 15 min; GB/T 38144.1-2019 sets hard figures for flow, at least 1.5 L/min for eyewash units, 11.4 L/min for eye/face wash units and 76 L/min for emergency showers (the flushing fluid temperature range is governed by the text of the standard itself). An eyewash station with weak pressure or a seized valve was never installed.

Pitfall 4 — goggles alone at the grinding station

One gap remains: treating eye and face protection as "a pair of goggles". At grinding, cutting and angle-grinder work, safety helmet, face shield, goggles, cut-resistant gloves, long-sleeved workwear and safety shoes are all required. Goggles stop particles coming straight at the face, the face shield stops fragments arriving at a wide angle, the helmet protects against what falls from above — they do not replace one another; each covers its own segment.

What a company can do now

1. Put a "lens kit" at the workstation: lens cloth, dedicated cleaner and a clean water point beside the grinding position, so the correct action is the easier one to reach for.

2. State three things on the purchase order: standard number (GB 14866-2023), impact grade and size. For products with ventilation, ask the 8.11 question at acceptance — "does the vent stop that 1.5 mm rod?" — and file the instructions in the register.

3. Review chemical splash posts specifically: check eye and face protection selection against the chemical safety data sheet, and physically test the 15-minute flushing capability of the eyewash equipment.

4. Post a prohibited list: cotton gloves on lenses, tape over vents, a lens with scratches inside the central 30 mm still in service, ordinary dust goggles on chemical posts — correct on sight, no authorisation needed.

The bottom line

Fogging is not a defect; it is a signal: the fit is not adjusted, the ventilation needs cleaning, or the lens is due for cleaning as instructed. The order is always the same — leave the work position first, treat the lens as the instructions specify, then put the full kit back on before returning. Not a quick wipe with the back of a hand.

When goggles fog up in your workshop, is the first reaction the hand — or the lens cloth?

CK Tech supplies the matching range: safety goggles CKY-135FW, protective shield CKL-3117 and safety helmet CKT-NTB-2. If you need selection by post, talk to us.

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This article is compiled from GB 14866-2023, GB 39800.1-2020 and the GB/T 38144 series. In practice, the text of the standards and the product marking prevail.