Short answer: Glass fusing is kiln work: pieces of compatible glass are laid out cold and heated in a kiln until they bond. Lampworking is torch work: rod and tube are softened in a flame and shaped by hand while hot. You do not need a torch to fuse, because glass makers sell stringer and frit ready to lay into a kiln project. A torch earns its place in a fusing studio when you want components made to your own design: stringer in the exact color and thickness you need, image cane cut into murrine, and small shaped pieces. Both crafts finish in a kiln, since annealing is a kiln job for both. Whichever path you take, keep every piece of glass inside one tested-compatible system.
If you already know you want to work at the flame, the best beginner glass torch guide is the next read.
Fusing and lampworking: one shared step, two different heat sources
The Corning Museum of Glass defines fusing, in the sense that matters here, as heating pieces of glass in a kiln or furnace until they bond, and kiln forming as fusing or shaping glass, usually in or over a mold, by heating it in a kiln. Its definition of flameworking is forming objects from rods and tubes of glass softened in a flame. The Crucible’s fusing guide describes the same split from the teaching side: compatible sheet glass joined in a kiln.
The practical difference is who controls the heat while the glass is soft. A fuser cuts and stacks cold glass, closes the kiln and lets the controller run the whole firing; nobody touches the glass while it is hot. A lampworker holds the glass in the flame and shapes it hot, minute by minute, and only then puts it in a kiln to cool.
That kiln is the step the two crafts share. Annealing holds finished glass where its internal stress can relax and then cools it under control, and both fusers and lampworkers do it in a kiln. Bullseye’s own recommended anneal soak for its glass is 900 °F, which it lowered from 960 °F in 2009 and applies to everything from simple fused pieces to large castings. A lampworker’s bead gets the same kind of soak at the figure its own glass maker publishes. The kiln is common to both paths; the torch is the tool a fuser can choose to add.
| Fusing (kilnforming) | Lampworking (flameworking) | |
|---|---|---|
| Heat source | Electric kiln | Torch burning fuel with oxygen (or air, on a canister torch) |
| Glass you buy | Sheet, frit and stringer from one fusing system | Rod and tube, plus frit and stringer |
| When the glass is shaped | Cold, before firing; the kiln does the melting | Hot, in the flame, by hand |
| What sets the final temperature | The kiln controller’s program | Your flame and your timing |
| Role of the kiln | Does the work: fuses, slumps, anneals | Garages and anneals what the torch made |
| First big purchase | The kiln | The torch and its oxygen supply |
Can you fuse glass with a torch?
At small scale a torch joins glass to glass all the time; that is most of what lampworking is. What a torch cannot do is replace the kiln for fused work. A flame heats a small zone, and a fused plate or panel needs the whole piece brought up together, held, and cooled under control. Bullseye’s TechNotes 4 frames annealing around exactly that: letting the temperature equalize through the piece and then cooling it under control, with the requirements set by its dimensions, geometry and kiln conditions. A kiln controller does that job in programmed segments. Skutt’s Ramp-Hold documentation defines each one by a ramp rate, a target temperature and a hold time, and a firing is those segments chained together.
So the answer to “can I use my lampworking torch to fuse?” is: not for the flat, layered work most people mean by fusing. The torch builds parts; the kiln fuses and anneals the piece.
Where a torch genuinely enters fused work
Stringer in your own colors and sizes
Fusers draw lines with stringer. You can buy it: Bullseye publishes a Working with Stringer lesson on using its factory-made stringer. Pulling your own at the torch gives you any color and any diameter on demand. The pulling itself is the skill in our stringer control guide: gather size, a consistent wait out of the flame, and pull speed decide the diameter. For fused work, pull from glass of the same fusing system as the sheet it will lie on.
Image cane and murrine
The Corning Museum of Glass describes murrine as the patterned slices revealed when a composed glass cane is cut crosswise. Building and pulling that cane is torch work, covered step by step in murrine and millefiori lampwork. The slices can then be laid into a kiln project like any other component. The rule that catches people: every rod in the cane has to belong to the fusing system it is going into. A chip pulled from a 104 beadmaking palette is not a Bullseye component, however well it is made.
Frit, which mostly needs no torch at all
Frit is crushed glass graded by size, and Bullseye sells its own in named grades from powder up to coarse (the frit application guide gives its published size ranges). Making frit from your own scrap is mostly cold work with a hammer or crusher, plus a community quench method; the scrap glass guide covers the methods and the impact-rated eye protection they need. Frit alone is not a reason to buy a torch. Frit stringer is a different story: rolling a gather through frit and pulling it into a drawing line is torch work.
Small shaped pieces, and the extra heat they carry
Dots, pulled points and small solid shapes made at the torch can also go into a kiln layup. One caution comes from Bullseye directly: its What to Expect guidance explains that its factory testing covers defined conditions, and it names torchworking as a process that can put more heat into the glass than its standard kiln tests represent. Test the combination through the whole process you intend to use, torch and kiln together, before committing a large piece to it. Our glass compatibility guide explains how to set up that kind of sample and record it.
COE: why fusers and lampworkers both care
COE, the coefficient of thermal expansion, is the number glass is sold by in both crafts, and both care for the same reason: glasses that do not fit put stress into the piece as it cools. They meet the problem at different moments. A fuser fires every element of a piece together, so one wrong chip of glass is fired into the whole plate. A lampworker joins rods hot, encases one color in another and attaches parts, so the fit is tested at every seam.
The families do not mix. Most soft glass sold for beadmaking belongs to the 104 family (Effetre, Creation is Messy, Lauscha and others, covered in soft glass brands explained). There are 96 and 90 families on the fusing side, and borosilicate sits at 33. Bullseye adds a useful precision in its own FAQ: it describes its compatibility as a tested product system rather than a “COE 90” rating, and it distinguishes products intended for fusing from products that are not. For a fuser who wants torch-made parts, that means torching glass from the fusing system itself (its maker can say which products suit torchwork), not a beadmaking palette that happens to look right.
A matching number is still not a guarantee. Two glasses with the same nominal COE can fail to fit, and the reasons (viscosity, heat history, the actual pair of glasses) are the subject of the compatibility guide linked above. Annealing figures also belong to their own glass. Bullseye’s 900 °F soak is for Bullseye; Effetre lists an annealing temperature of 470 °C (about 878 °F) for its own rods. Use the figure the maker of your glass publishes, and see annealing schedules for glass for the soak and cool-down logic.
What torch and what kiln each path needs
| Your path | Torch | Kiln |
|---|---|---|
| Fusing only | None | A fusing kiln whose maximum temperature and element layout suit the glass maker’s published firing schedule |
| Fusing, plus your own stringer and murrine | A small torch for the fusing system’s soft glass | The fusing kiln you already need |
| Lampworking (beads, small sculpture) | A bench torch with an oxygen supply | An annealing kiln with a bead door for garaging |
| Both | Pick the torch for the glass you will actually torch | Check the kiln’s maximum and its door against both jobs |
The torch. For occasional stringer in soft glass, a canister-fed Hot Head needs no oxygen, regulators or hoses. It is slow and loud and works soft glass only in practice, a limit that matters less if soft glass is all you plan to torch. If you will pull cane every week, or want the reactive colors that lampworkers report a canister flame will not fully strike, an entry surface-mix bench burner such as the Nortel Minor, GTT Cricket or Carlisle Mini CC is the usual next step, and the bench vs hand torch guide explains why a bench mount, not a hand torch, is the beginner’s choice. Adding any torch adds a fuel system, and a bench burner adds oxygen: plan the ventilation, the eyewear for the glass you work, and the flashback protection your torch and gas supply call for, all covered in the glass torch safety setup guide.
The kiln. A fusing kiln and a lampworking annealer are built for different jobs. Paragon describes its Fusion 10 fusing kiln as having top elements in a firebrick lid plus a sidewall element, which it says gives uniform heat for thicker work. A lampworker’s annealer is built around access while you work, with a bead door that takes a mandrel or a punty without opening the main door (the lampworking kiln guide compares door styles and chamber sizes). Do not assume one kiln covers both. Jen-Ken’s Chilipepper, a popular bead annealer, has an 1100 °F maximum, which makes it an annealer rather than a fusing kiln. Before buying a kiln for both crafts, read its maximum temperature against your glass maker’s fusing schedule, and check whether it has a door you can feed hot work through mid-session.
What to buy first
If fused plates, panels or jewelry are the goal, buy the kiln first, and choose glass from one fusing system. Use the maker’s stringer and frit while you learn what the kiln does. The Crucible runs fusing and slumping and flameworking as separate departments, so a fusing class teaches the firing side without a torch.
If beads or small sculpture are the goal, you are a lampworker, and the torch is the decision that shapes everything else. It is the tool you will work for years, and you cannot really know how one behaves until you have worked on it, so it deserves the most care: start with the beginner torch guide, then add an annealer before the pieces matter, as the kiln guide explains.
If you fuse and want torch-made parts, add the torch after the kiln, in the fusing system’s glass, starting small. A Hot Head tells you cheaply whether you enjoy pulling your own stringer; a bench burner and an oxygen supply make sense once you know you do.
Editor’s note: annealing and maximum-temperature figures on this page are each attributed to the maker that publishes them (Bullseye for its glass, Effetre for its rods, Jen-Ken for the Chilipepper) and are not interchangeable between glasses or kilns. We quote no fusing temperatures: they vary by glass, project size and thickness, so take the firing schedule from the maker of your glass and the operating limits from your kiln’s manual, which take precedence over this guide.
Related guides
- Best beginner glass torch
- Hot Head torch guide
- Bench torch vs hand torch
- Lampworking kiln guide
- Annealing schedules for glass
- Glass compatibility beyond COE
- Lampworking vs flameworking vs glassblowing
Sources
- Corning Museum of Glass, Glass Dictionary, “Fusing”: https://allaboutglass.cmog.org/definition/fusing
- Corning Museum of Glass, Glass Dictionary, “Kiln forming”: https://allaboutglass.cmog.org/definition/kiln-forming
- Corning Museum of Glass, Glass Dictionary, “Flameworking”: https://allaboutglass.cmog.org/definition/flameworking
- Corning Museum of Glass, LibGuides, “Murrine”: https://libguides.cmog.org/murrine
- The Crucible, “Glass Fusing Guide”: https://www.thecrucible.org/guides/glass-fusing-3/
- The Crucible, “Glass Fusing & Slumping” department: https://www.thecrucible.org/departments/glass-fusing-slumping/
- The Crucible, “Glass Flameworking” department: https://www.thecrucible.org/departments/glass-flameworking/
- Bullseye Glass, FAQ (tested system, fusible designations, frit grades): https://www.bullseyeglass.com/faq/
- Bullseye Glass, “What to Expect from Bullseye Glass” (test conditions and torchworking heatwork): https://www.bullseyeglass.com/what-to-expect-from-bullseye-glass/
- Bullseye Glass, TechNotes 4: Heat & Glass: https://www.bullseyeglass.com/wp-content/uploads/2023/02/technotes_04.pdf
- Bullseye Glass, “Recommended Annealing Cycle for Bullseye Glass”: https://videos.bullseyeglass.com/videos/recommended-annealing-cycle-for-bullseye-glass/
- Bullseye Glass, “Working with Stringer”: https://videos.bullseyeglass.com/videos/working-with-stringer/
- Effetre Murano, “Glass Rods”: https://www.effetremurano.com/en/prodotti/glass-rods/
- Skutt, Ramp-Hold mode documentation: https://www.skutt.com/pdf/glass_kilns/RampHoldMode.pdf
- Paragon Kilns, Fusion 10 glass fusing kiln: https://paragonkilns.com/products/fusion10-glass-fusing-kiln
- Jen-Ken Kilns, Chilipepper bead annealer: https://www.jenkenkilns.com/products/chilipepper