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The most useful safety fact in a hot shop is also the least intuitive: hot metal looks exactly like cold metal. You will not be warned by the appearance of a tool, a pipe or a bench. You will be warned by knowing where things have been. Almost every burn in a glass studio comes from a tool, not from the glass, and almost all of them were avoidable by habit rather than by equipment.
Hazard one: heat, and specifically the tools
Glass is obvious. You know the gather is hot because you just took it out of the furnace. The danger is everything the gather touched on the way to the bench: the jacks, the paddle, the shears, the pipe head, the edge of the marver, the spot on the bench where a hot piece was set down.
- If you see something falling, do not grab it. Let it land. This single rule prevents more serious hand injuries than any other.
- Assume every tool in the working area is hot. Treat the whole bench as a hot zone, not just the furnace.
- Announce when you are moving hot glass, and listen when someone else does. Most collisions in a shop are two people who did not know where the other was.
- Keep the working area clear. A hot piece set down on a cluttered bench is a fire.
- Never reach across a working piece. Walk around.
Hazard two: why gloves are usually the wrong answer
Beginners assume gloves are protective. In a hot shop they frequently are not, and this is the point most often misunderstood by people who have not worked hot glass.
Glass conducts heat far less than metal. A pipe handle that is 60 cm from the gather stays cool enough to hold for a whole session, no matter how long you work. A glove removes the ability to feel what the glass is doing — and feeling the glass is how you know when it is centred, when it is stiffening, and when a tool is about to tear it.
Worse, a glove that does get hot gives you no warning. It insulates the surface long enough for the heat to build underneath, and a synthetic glove in that situation can melt and cling to skin, which turns a minor burn into a serious one.
“Most glassblowers don't wear gloves — you need to feel what's happening in the glass.”
There are exceptions. Some processes need a heat-resistant glove on the non-dominant hand for a specific grip, and kiln work at high temperature is different from bench work. The point is that a glove is a decision made for a reason, not a default.
Hazard three: fumes, dust and ventilation
The hazards you cannot see are the ones that accumulate. Two matter most: combustion products and metal fume from the torch or furnace, and silica dust from coldworking.
| Hazard | Where it comes from | What controls it |
|---|---|---|
| Carbon monoxide | Any flame. A gas furnace or torch running rich produces it continuously. | Adequate make-up air and an extraction path. A CO monitor in an enclosed space. |
| Metal fume | Vaporised metal from oxides, coloured glass and metal leaf. | Local extraction at the torch, and a respirator rated for metal fume. |
| Silica dust | Grinding, sawing and polishing glass with a grinder. | Wet grinding wherever possible, plus local extraction and a P2/P95 respirator. |
| Fine colour powder | Sieving or rolling powdered colour onto hot glass. | Extraction at the bench, and a respirator while handling powder. |
| Heat and dehydration | Working beside a furnace all day. | Water, breaks, and not working alone. |
Silica dust is a long-latency hazard: the damage is cumulative and does not announce itself. Wet grinding, local extraction and a properly fitted respirator are the controls that matter, and they matter every time, not only on the big jobs.
Hazard four: eyes, clothing and the things people forget
Eye protection in a hot shop is not sunglasses. It needs side shields, and the tint has to suit the work.
- Sodium flare from soda-lime glass is intense yellow-orange and washes out detail. Didymium or equivalent lenses filter it without darkening everything else.
- For high-intensity work, an ANSI shade rating applies. Choose it for the process, not for the look.
- Side shields matter more than the front lens. Glass and fragments come from the side.
- Wear natural-fibre clothing — cotton or wool. Synthetic fabric melts and sticks to skin.
- Closed-toe shoes, always. No sandals, no canvas, no exceptions.
- Tie back long hair and avoid loose sleeves near a flame or a rotating pipe.
- Nothing flammable in a pocket. A lighter in a chest pocket is a burn waiting for a spark.
The habits that prevent most incidents
Set up the workspace before the first gather
Water bucket, tools in the same place every time, clear bench, nothing on the floor. You will be moving quickly later and will not be looking.
Establish a hot zone and never put anything in it
The area around the furnace, the glory hole and the bench is hot. Everything else goes elsewhere.
Know where the annealer door is and keep it clear
You will be walking to it with a hot piece in your hands and no ability to catch yourself.
Work with someone, or do not work
Burns and cuts in a shop are worse when nobody is there. This is a craft that assumes a second person.
Check the flame and the extraction at the start of every session
A blocked extraction or a rich flame is invisible until it is not.
Stop when tired
Most shop injuries happen at the end of a long day, when the rotation slows and the tools get set down in the wrong place.
Know your local requirements
Gas installations, ventilation and fire requirements vary by jurisdiction and are not optional.
First aid that actually applies
Burns are the common injury. Cool running water for twenty minutes, not ice, not butter, not a cream. Do not break blisters. Cover with a clean non-adherent dressing. Seek medical attention for anything larger than a palm, anything on the face or hands, or anything that looks white or charred.
For eye exposure or a foreign body, do not rub. Flush and get medical help. For a cut from broken glass, treat glass as contaminated — a clean glass cut still needs proper cleaning and, often, closure.
