Simple steps for greater safety
In any laboratory, broken glassware is never a minor issue: it exposes staff to cuts, increases the risk of contamination, disrupts ongoing procedures, and generates additional costs associated with urgent replacements.
Beyond the simple loss of equipment, these incidents often result in delays in experiments and disruption to team operations.
The purpose of this guidance sheet is to suggest simple, reproducible steps that you can implement today to extend the lifespan of your glassware and ensure safe daily handling.
It is intended for all users of standard laboratory glassware, whether borosilicate or soda-lime glass, and aims to provide concrete guidelines for storage, handling, cleaning, and drying.
The scope of this guide is intentionally limited to general-purpose glassware used in most teaching, research, or testing laboratories.
Very specific cases (sealed ampoules, advanced vacuum glassware, custom-blown devices, etc.) require additional recommendations and are not covered here.
Objective and Scope
Objective: Fewer accidents, fewer work stoppages, and fewer urgent restocks, thanks to simple steps that can be implemented today.
Scope: General glassware (borosilicate or soda-lime glass), excluding specific cases such as sealed ampoules or advanced vacuum glassware, ...
Why does glassware break? The main causes
- Thermal shock: Hot-to-cold or cold-to-hot transition.
- Invisible microcracks After a minor impact (edge of a workbench, sink, basket, cart).
- Mechanical stress: Clamp too tight, pressure on an edge, twisting, misaligned assembly.
- Improper internal handling and transport: Carrying by hand, stacking without support.
- Improper washing, drying, and storage Impacts in the sink, unstable drying, friction, direct stacking.
10-minute breakage prevention checklist
1. Receiving & inspection
- Systematically inspect each piece: chipped edges, star-shaped cracks, deep scratches, cracks.
- Discard any questionable glassware: a microcrack often means imminent breakage (especially during heating or washing).
- Designate a dedicated "glassware quarantine" area ( a labeled bin) for items to be checked.
2. Handling on the lab bench
- Place the glassware on a stable surface (mat, stand, tray), avoiding table edges.
- Never carry a beaker or Erlenmeyer flask by the neck if it is full: always support it by the base.
- Avoid prying with a stuck glassware item: unblock it with warm water, a compatible lubricant, and/or gentle rotation.
3. Heating & cooling
- Avoid sudden temperature changes:
- Hot → never place directly under cold water or on cold metal;
- Cold → do not place directly on a very hot hotplate.
- Allow for a gradual increase in temperature.
- Use appropriate supports (tripod, rack, water bath) rather than harsh direct contact.
4. Clamping, clamps, and setups
- Do not over-tighten: glassware often breaks due to stress, not because of inherent weakness.
- Use pliers or rings with protective features (sheathed or coated jaws).
- Align the assembly to avoid any forced twisting intended to correct misalignment.
5. Internal transport
- Avoid transporting items loose by hand.
- Use trays, bins, baskets, or carts with raised edges.
- Use dividers or supports for tall items (test tubes, burettes, cylinders).
A simple rule: if it can roll, it will eventually fall.
6. Washing, drying, storage
- In the sink: avoid "shock baths" and collisions between parts.
- Use brushes or swabs suited to the diameter, without applying excessive force.
- Use a stable drying rack or stand for drying rather than just paper towels.
- During storage: avoid stacking glass items directly on top of each other; separate them by size and use; and designate a "fragile glassware" area for burettes, pipettes, and long items.
The 10 classic mistakes to avoid
- Do not place hot glassware on a cold or metal lab bench.
- Rinse a still-hot container with cold water.
- Stack beakers like cups.
- Carry multiple items in your arms.
- Over-tighten a clamp on a flask or Erlenmeyer flask.
- Forcing a bottle brush that is too large.
- Allowing glassware to clatter in the sink.
- Storing long items without support (risk of tipping over).
- Using glassware with a chipped rim and hoping "it'll be fine".
- Picking up broken glass without the proper tools.
What to do in case of broken glass?
Priority: safety.
- Secure the area: warn people in the vicinity and set up barriers if necessary.
- Put on appropriate PPE (protective gloves, safety glasses).
- Pick up glass only with tools (small broom and dustpan, tongs), never with bare hands.
- Dispose of the fragments in the designated container, taking into account the level of contamination if applicable.
- Document the incident (what, where, probable cause) to implement preventive measures.
30-Day Mini-Plan
A simple plan to structure your approach to reducing breakage over the course of a month.
- Week 1: inspection and sorting, removal of questionable parts.
- Week 2: Set up transport equipment (trays, bins, carts).
- Week 3: Installation or optimization of drying racks and rules for sink use.
- Week 4: Standardization of clamps and fasteners; reminder about the risks of thermal shock.
Easy KPI: Track the number of breakages per week and their probable cause.
Take it a step further
- Apply an internal label reading “Fragile / Long / Transport in Bin” to the relevant glassware.
- Incorporate a short 15-minute training session for new arrivals, based on this checklist.
- Display a “proper storage / improper storage” photo in your lab to reinforce best practices.