DSEAR paint mixing: a listing is not a zone mark

You are at a mixing bench with solvent paint or a two-pack tin, and the agitator page says the pneumatic design is particularly suitable for flammable and explosive industrial environments. That sentence is the explosive-atmosphere evidence on the Generic IBC air agitator, ASIN B0HLXKCNZ7, listed at £245.99 on amazon.co.uk. DSEAR paint mixing is the workplace question under that sentence: who must assess the area, what the Health and Safety Executive treats as a Zone 1 example, and which marks are absent from the file.

Peter F. set that amazon.co.uk listing file against HSE’s public pages on ATEX, electricity in explosive atmospheres, operational circular OC 803/71, guidance sheet MR1 and HSG261. There was no lab test and no bodyshop inspection. A qualifying purchase through our links can earn a commission at no extra cost to you. The top pick in the agitator comparison is the SZXMDKH ball pack for water-based hobby bottles, about £5.11. It is the wrong scale for this duty.

In short

DSEAR requires employers to eliminate or control the risks from explosive atmospheres at work. HSE’s vehicle-repair circular treats paint mixing as a Zone 1 example and, as good-practice guidance, says to keep ignition sources 2 metres from the mixing point. An air motor is not automatically suitable for that zone, and the B0HLXKCNZ7 file contains no certificate number.

Who DSEAR paint mixing duties fall on

DSEAR is the Dangerous Substances and Explosive Atmospheres Regulations. HSE’s ATEX pages say they put the workplace side of the European ATEX directive into effect in Great Britain: England, Scotland and Wales. The duty sits with the employer. You eliminate or control risks from dangerous substances and, where an explosive atmosphere may occur, classify zones, keep ignition sources out, mark entries where required, and have explosion safety confirmed before a zoned workplace is first used.

HSE’s definition is a mixture of a dangerous substance with air, under atmospheric conditions, as gas, vapour, mist or dust, in which combustion spreads. Those conditions are described as ambient temperature and pressure, commonly about −20°C to 40°C and about 0.8 to 1.1 bar. Circular OC 803/71, for employers and the self-employed in motor vehicle repair, puts paints and solvents in that group. A desk of water-based craft paint sits outside that employment picture. A self-employed sprayer mixing solvent paint sits inside it, including in a garage at home. With five or more employees, record the significant findings. HSE’s electricity page says new equipment for these atmospheres on the Great Britain market must be UKCA or CE marked, with a declaration of conformity and English instructions. Northern Ireland’s goods rules differ. This listing shows none of those marks as a certificate number.

What HSE says about Zone 1 paint mixing

OC 803/71 says classification on a motor-vehicle site is not simple. Zone 0 or 20 is present continuously or for long periods, with the inside of a petrol tank as the example, and it needs Category 1 equipment. Zone 1 or 21 is likely in normal operation but only occasionally: a spray booth, and paint mixing, needing Category 1 or 2. Zone 2 or 22 is unlikely in normal operation, or brief, with a vehicle inspection pit as the example. The 20-series zones are the dust equivalents. Equipment already in use before July 2003 may stay where a risk assessment finds it safe.

Appendix 1, under paint mixing, says these good-practice notes are not mandatory. Exclude ignition sources within 2 metres of the mixing point, and use EPS equipment on installations new or modified after June 2003. The same note asks for extraction where possible, lids on containers, and a fire-resistant room away from other work. HSG261 gives more than five air changes an hour as the ventilation example and says electrical equipment around the mixer should be Ex-rated. MR1, the COSHH sheet for two-pack isocyanate including prepolymer, says to run ventilation whenever somebody is present, send extract outside, and keep indoor stocks of flammable liquid to 50 litres or below. Those figures are HSE’s. This page did not measure a workshop.

What an explosive atmosphere paint mixer listing omits

The file we can audit is amazon.co.uk ASIN B0HLXKCNZ7, a generic clamp-on pneumatic agitator, at £245.99, with no star line. Bullets describe a folding propeller and a clamp, and three machines at once: 50-, 100- and 250-gallon variants, speeds of 0–1,300, 0–1,900 and 0–2,500 rpm, and motors of 1/2 hp, 3/4 hp and 1 hp. The ASIN does not say which one ships, and air flow is absent.

The same bullets say the design is particularly suitable for flammable and explosive industrial environments. The file has no certificate number, no Ex category, no temperature class and no declaration of conformity. HSE’s electricity page says equipment for these atmospheres should carry the Ex mark and the conformity mark. Seller copy is not that mark. The buying guide is where the missing motor identity shows up before any zone question: 1/2 hp and 1 hp are not the same tool.

An air motor is not an Ex rated mixer

Air drive takes the mains motor off the vessel. HSE’s electricity page says electricity can make hot surfaces or sparks, and tells you to control static with bonding and anti-static clothing. That is a reason to look hard at a mains motor at the mix point. It is not a certificate for every air tool. An air motor can still run hot, and a poor clamp can leave the vessel isolated. This listing prints no category. The pneumatic versus electric page compares drive type for ordinary liquids. Category 1 or 2 is what the circular attaches to Zone 1 paint mixing.

Hobby acrylic sits outside this duty

A bottle of water-based model acrylic is a different job: tens of millilitres, a water-borne binder, and a ball or a small shaker. HSE’s explosive-atmosphere examples are workplace releases of flammable gas, mist, vapour or dust. Some model paints are solvent-borne, and those follow the ventilation and ignition lines on their own label. MR1 says isocyanate two-pack, including prepolymer, can cause asthma and dermatitis. If the safety data sheet says flammable, follow it. Shaking separated water-based colour is storage. Mixing a flammable coating for a paying repair is DSEAR and COSHH.

Checks before you mix solvent paint

Start with the safety data sheet. OC 803/71 puts substitution first where reasonably practicable. Where the risk remains, keep quantities down, keep lids on, and keep ignition away. Use a fire-resisting room, with extraction running when people are present. For a Zone 1 reading, ask for Category 1 or 2, the Ex mark, a conformity mark valid where you place the goods on the market, a declaration, English instructions, and one configuration: horsepower, vessel, air use and certificate number. “Particularly suitable” is still seller copy. A competent person confirms a zoned workplace before first use. This page can show the public guidance and the gap on one amazon.co.uk file. It cannot classify your room.