Safety Is the Foundation of Good Glassblowing
Glassblowing is a craft that demands respect for its materials and environment. You are working with glass at temperatures exceeding 2,000°F (1,093°C), operating large gas-fed furnaces, and moving through a shared workspace where a moment of inattention can cause serious injury — to yourself or to someone else. Experienced glassblowers don't treat safety as a constraint on creativity; they treat it as the foundation that makes creativity possible. Here are ten practices every person in a hot shop must know.
1. Always Announce "Hot Glass"
This is the most universal rule in any hot shop. Whenever you are moving with a hot blowpipe, punty, or piece of glass, you announce it verbally — loudly and clearly. "Hot glass coming through" is the phrase. It doesn't matter if you think you're the only one in the room. This habit must become automatic.
2. Wear the Right Clothing — Every Time
As covered in our beginner's guide, natural fiber clothing is non-negotiable. Cotton, wool, and denim are your friends. Synthetic fabrics (polyester, nylon, rayon) melt at much lower temperatures than molten glass and can fuse to skin. Closed-toe leather or sturdy canvas shoes, long pants, and fitted sleeves are required for every session at the furnace.
3. Use Proper Eye Protection
Glass furnaces and glory holes emit intense infrared (IR) radiation. Extended exposure without proper eye protection can cause infrared cataracts — a serious, cumulative eye condition historically common among glassblowers and metalworkers. Standard sunglasses are not sufficient. You need specialty didymium or AUR-92 filter lenses rated for glassblowing, which block the specific wavelengths emitted by hot glass. Invest in proper eyewear before spending significant time at a furnace.
4. Never Set Hot Glass Down Unannounced
Hot glass looks exactly like cold glass. A piece left on a bench, table, or floor without a clear marker is an accident waiting to happen. Always place hot glass in designated areas, and if you must put something down temporarily, mark it with a visible indicator and verbally alert anyone nearby. Many studios use a "hot" label or a specific placement convention.
5. Maintain Clear Pathways
Hot shops have defined movement zones for a reason. Blowpipe users swing long, heavy, extremely hot tools. Pathways must remain clear of equipment, bags, chairs, and bystanders. Never cut through someone's work zone while they are at the bench or furnace. Learn the traffic patterns of your specific studio and follow them consistently.
6. Keep Your Bench Organized
A cluttered bench leads to accidents. Tools left in unexpected positions can be reached for blindly — with dangerous results when your attention is on a piece of hot glass. Keep your tools in their designated positions, blades facing away from you, and clear your bench of anything you're not actively using.
7. Hydrate and Take Breaks
Heat exhaustion is a real risk in a hot shop, especially during long sessions or in summer months. Drink water consistently throughout every session — don't wait until you feel thirsty. Watch yourself and your fellow glassblowers for signs of heat exhaustion: dizziness, nausea, pale or clammy skin, confusion. Step into a cool area the moment you feel overheated.
8. Handle Glass Cullet and Shards With Care
Broken or cold glass is every bit as dangerous as hot glass, just in a different way. Glass shards are extraordinarily sharp. Always sweep — never use bare hands to collect broken glass. Use a dedicated glass waste bin (often a sealed metal container), not the regular trash. Wear cut-resistant gloves when handling large cullet pieces.
9. Know Your Furnace and Equipment
Before working in any studio, familiarize yourself with the specific equipment in that space. Know where the gas shutoffs are. Know the emergency procedures. Know how to identify an abnormal sound or flame from the furnace. Gas leaks, furnace malfunctions, and unexpected pressure changes are rare but serious. A basic understanding of the equipment you're working around can save lives.
10. Never Work Alone as a Beginner
Beginners should always work with at least one other experienced person present. Even experienced glassblowers often choose not to work entirely alone in a hot shop. In the event of an injury or equipment malfunction, having another person present is critical. Many studios have explicit rules against solo working — know your studio's policy and follow it.
Building a Safety Culture
Beyond individual practices, the safest studios are those with a genuine culture of mutual awareness and accountability. Experienced glassblowers speak up when they see unsafe behavior — not to embarrass, but because everyone in the room shares responsibility for everyone else's safety. Embrace that culture from day one, and you'll be a valued presence in any hot shop you work in.