A Routine Transfer, a Broken Bottle
In early September 2026, three technical staff at a university chemistry faculty in Tarragona, Spain, were decanting concentrated nitric acid from a five-litre container into one-litre glass bottles before the new academic year. The work was done inside a fume hood, with a pump, and with protective equipment on. Then a bottle hit the floor and broke, and a deflagration followed almost at once. It deformed the hood and pushed pressure and liquid out through its working opening, scattering glass and reagent. Two of the three were admitted in a serious condition, one needing surgery; a third was treated as a less urgent case. All three reached the emergency showers themselves. No structural damage was recorded.
For buyers of hand and foot protection, the sequence matters more than the verdict. This was a compliant task that still produced injuries.
The Hood Contains the Event, Not the Operator
A fume hood moves air across an aperture so that vapours are captured. It is not a physical barrier: when a reaction releases energy at bench height, the pressure wave and the spray travel out through the same opening the operator works at. The hood kept the event inside one room, but it could not keep people out of its path, so the final layer of protection sat on the workers.
That changes how a glove choice should be argued. Chemical gloves are selected from permeation data for a named substance at a stated concentration, which remains the right starting point. But nitric acid is an oxidiser as well as a strong acid. It reacts with organic material, releasing heat and gas rather than diluting away, so residue on a bench, in a container or on protective equipment becomes part of the hazard. Bench work is repetitive, so swelling, hardening and loss of grip often retire a glove before any breakthrough figure would.
Splash, Shrapnel, and Two Sets of Ratings
The incident produced cuts from broken glass alongside chemical burns, a combination that is easy to miss because chemical gloves and cut-resistant gloves are usually bought on different logic. Chemical performance in Europe sits in the EN ISO 374 family, with declared permeation against listed substances; mechanical performance sits in EN 388, where cut resistance is graded by a separate blade test. A glove carrying both tends to be heavier and coated, with less feel for fine work; a thin unsupported disposable gives dexterity but snags and tears. Asking for both ratings on one datasheet, for the concentrations actually used, is a reasonable minimum.
Two details decide whether the protection is real: the cuff must overlap the sleeve so a splash runs down the glove rather than into it, and doffing must be rehearsed, because the outside of the glove is the contaminated surface.
Wet Floors, Runoff and the Spec Sheet
Emergency showers do not make an acid disappear; they send it, diluted, across the floor, where it stays until it is contained. Anyone walking through that film needs footwear that resists the chemical and still grips a wet, possibly polished surface. Where bulk containers are decanted, or a spill kit has to be deployed in a hurry, closed-toe shoes are a cultural habit rather than a control. Chemical-resistant footwear or overboots also carry residue out of the room, so a change point at the threshold belongs in the plan.
For the next specification review: name the substance, its concentration and the task; ask for degradation behaviour as well as breakthrough time; require mechanical protection on the same glove; confirm cuff length and the doffing method; and state whether the item stays in service after a decontamination wash.