Glass handling, cutting and breakage response

Purpose

To handle, dress and cut glass without being cut by it, and to clear a broken sheet in the right order, by the right route, leaving nothing for a bare hand to find.

When to use it

Three moments, one procedure: carrying or loading a sheet — the contact frame, the UV unit’s glazing, a plate coating bed; cutting or dressing it to size; and the break.

If something has just broken, go to step 12. If it also spilled, the pieces come out here and responding to a spill takes over at step 14.

Before you start

You should already have read the glass section of the contact frame build — which glass, what thickness, and why the course prefers it bought cut — and the preparation order in coating glass dry plates: arris, then clean, because arrising makes glass dust. Read the Cut entry on the first aid quick reference now; you will not read it afterwards.

On the bench: a surface with nothing else on it; cut-resistant gloves, because a nitrile glove is a chemical control and stops nothing sharp; eye protection; a 220-mesh diamond pad or a carborundum stone, under running water; cloth tape; a lidded tin for offcuts; a dustpan and damp paper towels; a dressing within reach.

!One step of this procedure is Level B, and it is step 8

The baseline is Level A. Cutting glass yourself is a declared Level B step under the mixed-level rule; its controls are steps 7 to 11, and a glazier who cuts and polishes to size removes it.

This course quotes no cutting technique, having found no published domestic glass-cutting guidance for the launch market. Step 8 is your glazier’s method or your own; the controls around it are the course’s.

Procedure

Carrying and loading

1. Clear the surface the sheet will land on. A sheet set down on a dropped screw breaks in your hands.
2. Look at the edge before you touch it. Polished or taped: clean cotton or nitrile, so you leave no fingerprint. Raw from a cut: cut-resistant gloves, because a fresh edge goes through nitrile.
3. Lift by the two faces or by two diagonal corners — not by one edge or corner, and not with anything in the other hand.
4. Carry one sheet at a time, in a size you can carry: a sheet too large to handle easily is bought with the breakage included.
5. Sweep both faces before closing a frame on them. One grain of grit is a point load.
6. Close springs or clips by hand pressure alone. If you are pushing hard, stop: something is not flat, and forcing it is how glass breaks under a spring.

Cutting and dressing — the Level B step

7. Gloves and eye protection on, bench cleared and covered, work over a tray so anything dropped breaks somewhere findable.
8. Cut to the dimension you measured, not to the name of the format. For a plate, measure the holder.
9. Arris every cut edge with the pad or stone under running water, before the sheet is lifted by anything but its faces. Dry-abrading glass makes dust.
10. Every offcut straight into the lidded tin. Not the bench, not a bin bag.
11. Tape a frame sheet: Kodak tape the remaining edges of their own home-made frame so that you will not cut yourself, and it stops the chip that becomes a crack. A plate about to be coated is not taped — it is cleaned, dried and sleeved.

When a sheet breaks

12. Say out loud what has broken, leave it where it is, and keep others out.
13. The person first. If anyone is cut: firm pressure with a clean cloth, the hand or arm raised, nothing pulled out of the wound. The NHS reasons to call 999 or go to A&E include bleeding you cannot stop, lost feeling or trouble moving, a bad cut on the palm, and a shard stuck in the cut, which you do not take out. A cut taken with chemistry on the hands is a contamination event too: irrigate as well as dress. The rest is first aid.
14. The liquid second. Lift the large pieces with a dustpan or tongs, then run responding to a spill from its step 6.
15. The pieces third. Dustpan for what you can see, one damp paper towel for what you cannot. Not a brush.
16. Wipe the surrounding half metre, the bench lip and the floor where you stood: glass travels further than the pile you can see, as a spilled solid does.
17. Route it. Glass is a sharps stream — boxed, lidded, labelled — never a bin bag and never a chemical container. What it carried goes first by its own route, silver-bearing or general chemical waste; what may lawfully follow is a local question the disposal page governs.
18. Stop before you bin a plate carrying an image. The Library of Congress support a cracked plate with glass or lignin-free ragboard inside its sleeve, and house a broken one flat between boards in a four-flap enclosure, a conservator consulted where there is one.
19. Room lights on; look again low across the floor rather than down at it. Then gloves off by the removal sequence, hands washed, entry written.

How you know it worked

• Every edge you cut is arrised, every frame sheet taped, and nothing raw was carried.
• The offcut tin has its lid on; the sharps box has a label and a date.
• No glass went into a bin bag, and nothing sharp into a chemical container.
• After a break: the floor was wiped past the visible pile and looked at from a low angle with the lights on, and anyone cut has been dressed or sent for help.

If a step fails

Step 6, the frame will not close without force. Do not close it. Something is not flat — baseboard, back or grit — and the contact frame build says what to check.

Step 8, you cracked the sheet rather than cut it. It is an offcut now: go to step 10, and have the next one cut to size.

Step 9, the pad loads up and the edge stays sharp. The water has stopped. Do not go on dry.

Step 13, there is glass in the wound. Nothing comes out, by you. Press either side of it rather than on it, and get emergency help.

Step 14, the spill is silver nitrate, or a concentrated acid or alkali. The glass still comes out first; the substance governs the rest — silver nitrate, acid, alkali.

Step 17, you have no sharps route. Box it, lid it, label it broken glass with the date, and hold it.

Step 18, the plate is in pieces and you have no enclosure. Keep them flat and in order between two boards, and label the package. Discarding it later is still open.

What to record

The date, what broke or was cut, and where. For a cutting session: the size, the edges dressed, where the offcuts went. For a break: who was hurt and what was done; what the glass was carrying and which route took it; where an image-bearing plate is now.

Finish with the sentence that earns the entry: what put the glass in a position to break. A sheet broken under a spring, one carried one-handed and a plate slipped from a wet glove are three different failures with three fixes.