Elev8 Premier Studio Knowledge Base
Glass Terms, Techniques, And Tools
This is built to be the ultimate reference for students, collectors, and working artists.
Search it. Click a term. Jump right to the definition. No fluff. No gatekeeping.
Borosilicate
Lampworking
Kiln And Annealing
Tools
Color Work
Pipes And Percs
How To Use This Page
- Use search to filter the glossary instantly.
- Click any term link to jump directly to it.
- Open the How To sections for step by step technique workflows.
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Elev8 Premier truth:
Great glass is heat control plus clean mechanics plus proper annealing. That is the whole game. Everything else is style.
Kiln And Annealing Essentials
If your work cracks after it looked finished, that is not bad luck. That is stress you trapped.
Fix heat balance. Fix annealing. Suddenly you look like a wizard.
Annealing In Plain English
Annealing is controlled cooling that removes internal stress.
Borosilicate anneals around 1050°F. Soft glass (Moretti) anneals around 960°F.
Thicker glass needs longer soak and slower cool. Rushing thick work is a reliable way to manufacture heartbreak.
Borosilicate Annealing Chart
This is a solid starting point for 33 COE boro. Your mass and form still matter, but this chart gets you into the right neighborhood fast.
| Thickness (Inches) | Hours At Annealing Temp | Notes |
|---|---|---|
| 0.125 | 0.5 | Thin work still needs real annealing. |
| 0.25 | 1 | Common wall thickness range. |
| 0.50 | 2 | Heavier sections need soak time. |
| 0.75 | 3 | Start thinking thick work rules. |
| 1.00 | 4 | Do not shortcut this unless you enjoy callbacks. |
| 2.00 | 8 | Long soak, slow cool. |
| 3.00 | 12 | Plan around the kiln schedule. |
| 4.00 | 16 | Stress hides. Time exposes it. |
| 5.00 | 20 | Sculpture territory. |
| 6.00 | 24 | Patience beats remaking. |
Rule Of Thumb:
Anneal time is commonly estimated as 1 hour for every 0.25 inches of thickness.
Anneal time is commonly estimated as 1 hour for every 0.25 inches of thickness.
How To Guides
How To Set A Basic Borosilicate Annealing Schedule
- Confirm your glass type and COE. Do not mix unknown COE.
- Bring the kiln to annealing temperature (around 1050°F for boro).
- Soak based on thickness. Thin work needs less, thick work needs real time.
- Ramp down slowly to the strain point region, then continue a controlled cool to ambient.
- Do not open the kiln early. Let it finish. Your ego is not heat safe.
If you want a custom schedule for your kiln model and your typical work, bring your thickness and forms to class.
How To Do Wrap And Rake Without Making A Mess
- Heat your base evenly. Hotter base equals better adhesion.
- Spin consistently while feeding stringer off a rod. Faster spin equals thinner lines.
- Warm the wrap lightly and tack it down so it sticks clean.
- Preheat your rake rod and choose the line you want to pull through.
- Run the flame at an angle and pull through the wrap with steady speed.
- Keep heat controlled so you move the pattern, not the whole form.
How To Avoid Devitrification
- Keep heat clean. Dirty, reducing heat can haze surfaces fast.
- Avoid excessive reheats on the same surface area.
- Keep glass moving in the flame and avoid cooking it at the edge forever.
- Use proper kiln schedules so you are not stressing and reheating repeatedly.
Some devit can be fire polished out. Sometimes it cannot. Prevention wins.
How To Fire Polish A Cut Tube Safely
- Score and crack cleanly before you go to the flame.
- Use a controlled flame and rotate constantly.
- Bring the edge to a glossy smooth finish, not a saggy blob.
- Preheat the rest of the section if thermal shock risk is high.
Sharp ends cut people. Fire polish is not optional shop discipline.
Ultimate Glossary
Search above or jump by letter. Every term is linkable. Every link lands on the actual term.
Pro move:
If you are teaching, send students here and make them click the term they keep misusing. Instant upgrade to your studio culture.
If you are teaching, send students here and make them click the term they keep misusing. Instant upgrade to your studio culture.
AmphoraForm
A tall classical jar shape with two handles and a narrow neck. In glass, it refers to a traditional vase silhouette.
Annealer (Kiln)Tool
A kiln used to cool glass slowly to remove internal stress. Cooling too fast creates stress and cracking.
AnnealingKiln Science
Controlled cooling that removes internal stress and increases durability. Borosilicate anneals around 1050°F. Soft glass (Moretti) anneals around 960°F.
BatchMaterials
Raw materials melted into glass. Melting batch is time-consuming. Getting bubble-free glass can take many hours, and borosilicate can take days depending on furnace and chemistry.
Bead ReleaseMaterials
Mud-like coating applied to mandrels so beads can be removed after forming. It must dry hard before glass is layered on top.
Bender BackTechnique
A wig wag technique used to make tighter, cleaner wig wag motion in patterned tubing.
BillowBehavior
When tubing shrinks or condenses inward during heatwork.
BlebCleanup
That small leftover bit of glass on a tube end after splitting or closing. Remove it or it creates uneven wall thickness and unwanted gathering.
Blow HoseTool
Hose connected to tubing so the artist can blow air into glass to pop a hole, keep shape, or expand forms while heated.
Blow Hose AssemblyTool
Blow hose, swivel, and mouthpiece assembled as a unit. It performs better together than as separate parts.
BlankTerm
Used as a placeholder term in some shop glossaries. In practice, artists also call a “blank” a base form before decoration.
CFL Glass (Fluorescent Light Transitional Glass)Color
Glass that shifts color under fluorescent light. Often labeled “CFL” in industry terms.
Color BarMaterials
Common in soft glass. Manufacturers add oxides and colorants to molten glass and form it into bars for use.
Devitrification (Devit)Problem
Crystallization that makes glass look dull, wrinkled, or hazy. Sometimes it can be fire polished out. Sometimes it becomes a sandblast day.
Encasement WindowTechnique
When a piece of glass is placed inside another piece to create a window effect. This can be a switch ball, bubble trap, or any internal feature. Often requires switching the axis.
Fire PolishTechnique
Heating a cut or cracked edge until it becomes smooth and shiny. It removes razor-sharp ends that can cut you.
Flame AnnealingTechnique
Reheating a finished small piece in a bushy, cooler flame to relax stress temporarily. Usually a stopgap before proper kiln annealing.
Flame CuttingTechnique
Any technique where the flame is used to burn apart rod or tubing. Controlled heat, clean separation.
Flame TypeTorch
Three core flame types: neutral, oxidizing, and reduction (reducing). Flame chemistry changes color response, surface quality, and how certain metals behave.
Flameworking (Lampworking)Process
Heating and shaping rods and tubes with a torch flame. Also called lampworking or lamp-blowing.
FlaringTechnique
Heating the end of a tube and opening it using tools or centrifugal force to widen the mouth.
Flip Disc (Flips) Or DrawingTechnique
Similar to a filigree approach, but the artist draws an image, then flips it inside out so it becomes protected and dimensional. Used in rigs, pendants, and functional art.
Frit Disc DiffuserPerc
Diffuser made from fused frit that creates countless micro-perc paths. Extremely smooth, also prone to clogging due to tiny pathways.
Gas Mask PercPerc
Percolator styled like a gas mask. Built for aggressive diffusion and visual impact.
Honeycomb DiffuserPerc
Disc with many tiny holes. Creates lots of small bubbles, increasing smoke-water interaction. Durable and popular.
InlinePerc
Inline percolation layout that helped launch modern diffusion styles. A classic that still works.
Interceptor PercPerc
Uses plates and structure to break bubbles up further for high diffusion.
KilnTool
Heated chamber used for annealing, slumping, fusing, and controlled thermal processes. For functional work, annealing is the non-negotiable use.
MariahTechnique
Heating a tube and pushing it together to create a ridge or narrow band, forming a ring around the tube.
Marble TongsTool
Tool designed to grip round marbles securely where standard tweezers might slip. Often shaped like large tweezers with a ring grab.
MarblingTechnique
Mixing layered colors into a base so it appears marbled. Glass does not “wet” like paint, so the effect is engineered through layering and controlled blending.
Marver (Paddle)Tool
A shaping surface or tool, often polished steel, brass, or graphite. Used for forming and smoothing gathers and surfaces.
MasherTool
Tool used to mash glass into shapes, often flattening a round gather into a disc. Many variants exist.
Melting PointScience
The temperature region below which glass behaves as a solid and above which it can be shaped and formed.
Millefiori (Millie)Technique
“Thousand flowers.” Pattern canes sliced into chips to reveal images and designs. Extremely time-consuming and skill-heavy.
Mini TubeFunctional
Small water pipe often used for dabbing. Commonly considered around 6 inches or less, depending on shop terminology.
Neutral FlameTorch
Balanced fuel and oxygen flame. Often the default working flame for clean heatwork and predictable results.
Oxidizing FlameTorch
Flame with higher oxygen. Often used to keep certain colors clean and avoid unwanted reduction effects.
Pi DividerTool
Mechanical measuring tool used to determine post size for picking up and laying out multiple canes.
Pipe (Smoking)Functional
Basic tool used to smoke cannabis. Comes in many styles including spoon, sherlock, and one-hitter formats.
Pipe CoolerTool
Sprays water onto hot pipes and punties to cool them. Keep the pipe turning to avoid warping.
Pistol Grip Glass CutterTool
Cutter used for sheets of glass, including dichroic. Often includes a self-lubricating wheel and is designed for use with cutting oil.
PointProcess
Tube pulled down from a larger tube, forming a handle or starting point for later shaping. Common start for many builds.
PowderMaterials
Finely ground glass used for color application and surface effects.
PreheatingProcess
Heating glass from room temperature to reduce thermal shock before introducing it to a working flame. Done in a kiln or backwash.
Pre Mix BurnerTorch
Burner that mixes gases inside the body before ignition.
Propane TankFuel
Fuel storage tank. Sizes range from small portable tanks to large bulk setups.
Propane RegulatorFuel
Device used to reduce and stabilize pressure for consistent flame operation.
PuntyTool
Temporary glass handle used to hold and manipulate a piece while working it.
Quartz GlassMaterials
Often refers to fused quartz. Very high temperature performance and different working characteristics than standard boro.
RackStudio
Storage tool for parts, tools, prototypes, and samples. Uses vertical space efficiently.
RatachelloPattern
Pattern of many crossing lines. The more line density, the harder it is to execute cleanly.
RazorTool
Used to create thin lines in molten glass and refine certain surface effects. Also yes, it is a razor.
Reducing FlameTorch
Low oxygen flame, often with yellowish appearance. Used for reduction effects and certain metal reactions. Can haze surfaces if abused.
Shower Head PercPerc
Percolator designed to resemble a shower head and diffuse through multiple outlets.
SophietaTool
Tool used to inflate a vessel after removal from the blow tube. Often used with the piece on a punty while pressure is introduced through the nozzle.
StrikingColor
Colors that change based on heat history. Some are copper-based ruby strikes, others involve silver crystal growth and nuclei behavior. Time and temperature control the final look.
StringerMaterials
Thin pulled rods used for line work, detail, and pattern building. Often used in linework tubing and inside-out work.
Stump SuckerTool
Graphite tool that uses suction to help encase objects in clear glass. The artist becomes the vacuum pump through a hose and mouthpiece.
Switch Axis (Switch Ball)Technique
Switching the axis of patterned tubing to create the wig wag effect and produce two terminations. Often begins with striped tubing, sleeved, pulled down, then worked through the switching process.
TerminationTechnique
Where a tube is closed and the colors converge into a tight point. Clean terminations look sharp. Bad terminations look fuzzy and boiled.
Thermal Coefficient Of Expansion (COE)Science
How much a material expands per degree when heated. Matching COE is how you avoid stress fractures when combining different glass types.
Thermal ShockProblem
Strain created by abrupt heating or cooling. It cracks glass fast.
Wood BlockTool
Tool used to hold and shape glass. You can drill it to fit your needs. The weight matters. Burning it a little smells great, but do not get carried away.
Working RangeScience
Temperature range where glass is soft enough to shape and manipulate effectively.
Wrap And RakeTechnique
Wrap stringer lines around a warm base, then rake through those lines to create scalloped, dragged motion patterns.
Ball PercPerc
Ball with slits and internal weld work to break up airflow and improve diffusion.
Beaker PercPerc
Percolator shaped like a beaker bottom with cut slits, then welded into the piece.
Downstem PercPerc
Diffused downstem with many small holes. Creates many small bubbles and increased surface interaction.
Fountain PercPerc
Perc that may sit above the main body. Often stacked. Many slits for fine diffusion.
Want This Even Bigger?
This is structured to scale. If you want me to add the next 100 terms, I will expand it without breaking layout or links.
This is structured to scale. If you want me to add the next 100 terms, I will expand it without breaking layout or links.
FAQ
What Is Annealing?
Annealing is controlled cooling that removes internal stress and makes glass less likely to crack. Thickness and form decide how long you soak and how slow you cool.
Why Did My Piece Crack After It Looked Finished?
Stress was trapped. Temperature imbalance during construction or an insufficient anneal cycle is the usual cause.
What Is Devit?
Devitrification is crystallization that dulls the surface. Prevention is cleaner heatwork, fewer abusive reheats, and proper kiln schedules.
Do You Teach These Techniques At Elev8 Premier?
Yes. We teach real technique, tool control, and kiln discipline so your work stops failing.
If you want the fastest improvement: book a class, bring your hardest problem, and we fix it in person.