A hard fortnight at the melt
On 20 October, an explosion tore through the casting bay of an aluminium plant in northwestern Türkiye, followed by a fire that firefighters had to bring under control. Two workers were hurt, one of them seriously, and the cause remains under investigation. In the same fortnight, at a steel re-rolling mill near Dhaka, a suspected furnace leak sent molten iron spilling out of the furnace, triggering a blast that left four workers with burns ranging from ten to seventy per cent of body area. Authorities in both cases are still piecing together what happened.
Different countries, different metals, one shared feature: workers standing where metal pours, and a narrow line between a contained leak and a burn ward. For buyers of hand and foot protection, the foundry floor has its own logic, and it is not the logic of chemical splash.
Splash is tested on its own
A droplet of molten aluminium at around 700 degrees behaves differently from radiant heat or flame. If it wets the surface and adheres, it keeps transferring heat into one spot until it burns through fabric, glove or boot shaft. Protection therefore has to shed metal, not merely resist it.
Standards recognise this. EN ISO 11612 carries a separate code for molten aluminium splash and another for molten iron splash, both tested with the actual metal. A garment certified for one code may say nothing about the other, so the certificate must name the metal on your floor. For gloves, the relevant clauses cover contact heat and molten drops; a generic heat rating without a splash test is not a splash rating.
Moisture is the multiplier. Sweat inside a glove or dampness in a boot liner turns one droplet into a steam burn, and a leak reaching a wet floor becomes an explosion, which is one line of inquiry near Dhaka, where molten iron reportedly fell onto the ground below. Clean, dry equipment is part of the specification, not housekeeping.
The layering runs backwards
Chemical work puts coat cuffs outside gloves and tucks trousers into boots. Foundry work inverts it. Trousers must fall over the boot shaft so falling metal rolls off instead of pouring inside; gauntlets sit over the sleeve; nothing on the front of the leg creates a pocket. Laces, metal eyelets and heavy seams are trap points where a droplet sticks. Pull-on foundry boots with a smooth shaft and a heat-resistant outsole exist for exactly this reason.
Boot buyers should also ask what happens after contact: a shaft that has taken molten metal adhesion is finished, and the replacement pair must be on the wall that shift, not next month.
What to demand from suppliers
- Certificates that name the metal, with the aluminium and iron splash codes tested separately and at the level your process needs
- A complete ensemble trial, because the gap between glove, sleeve and cuff is where the burn lands
- Pull-on boots, heat-resistant outsoles, no laces, and spares sized across the whole crew
- Inspection and retirement rules: gear that has taken a splash is replaced, not re-worn
- Drying and storage discipline, so sweat and damp never ride into the melt area
The two incidents will take months to explain. The specification does not have to wait: match the certificate to the metal, close the gaps, and keep the kit dry.