Sealed End Clear Cylinder 10 Pack - 90 COE

$37.95 USD
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Item# 103100
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Product Features

  • Create blown glass bulbs with ease - perfect for a quick gift!
  • Eliminate the time consuming method of "pulling points" from glass tubes
  • 1mm wall, 28mm diameter before blowing
  • Includes 12 Silver Plated Caps and Loops for finishing
  • Sold in a pack of 10
  • 90 COE

Product Description

Create Custom Blown Ornaments The Simple Way
Making custom glass ornaments is easy with Glaskolben pre-blown clear glass cylinders with blow pipe ends. Glaskolben may be blown freehand into a ball using a Hot Head torch (item# 7329) and MAPP gas, eliminating the time consuming method of "pulling points" from glass tubes. Roll hot cylinder into frit before blowing to decorate. 

Annealing temperature is 950° F. 1mm wall, 28mm diameter before blowing. 10 cylinder pack, includes instructions and 12 silver plated caps and loops. 90 COE compatible.

For more information, see the User Manual under additional images to download an illustrated step-by-step guide, or watch our quick online video.

Delphi Tips:

  • Rotate the Glaskolben constantly in one direction while heating.
  • Use two hands if needed to stabilize your project in the flame while rotating to prevent wobbling into and out of the flame.
  • The tip of the Glaskolben has more mass and will take longer to heat to a softened state, concentrate heat there and periodically move the center into the flame to heat evenly.
  • Begin by blowing firmly, but be prepared to reduce pressure quickly if needed to prevent over-stretching soft glass.
  • Keep your Glaskolben level to prevent accent glass from gathering only at the tip or from pouring into the pipe.
Safety Note: Do not tip the Glaskolben bulb above the blow pipe end while blowing or handling your hot bulb.

First grouping of ornaments created by artist Tia Collin, remaining ornaments by Val Oswalt-De Waard

Customer Reviews

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3 out of 5 stars
  •   On the fence
By on
Pros : Great concept and convenient for beginners
Cons : Harder than it looks and wasted a good bit of material trying to get the right technique
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4 out of 5 stars
  •   Beautiful and challenging!
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Pros : The Glaskolben tubes are a fantastic way to make the most beautiful ornaments. Results after many failures have been stunning.
Cons : It’s my opinion the directions on use have a lot to be desired. They are incomplete. As it stand now a lot of trial and error is necessary to achieve positive results. We also need detailed information on working with colors, annealing, and additional tips for success. Also trouble shooting tips are needed.
Other Thoughts : More information on recycling is needed. At nearly $5 per “attempt” we need to know what/how failures can be recycled. This also includes using the blow tube. Heads up! You DO need the neodymium glasses for safety and to gauge the temperature of the glass before blowing.
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5 out of 5 stars
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Oct 01, 2011
GLASKOLBEN cylinders are pre-blown clear glass cylinders with blow pipe ends, used for blowing glass balls. Glaskolben cylinders are used throughout Europe for making Christmas tree ornaments. Glaskolben is a German word that translates to glass bulb. WATCHAVIDEOONBLOWINGGLASKOLBENORNAMENTS. SUPPLIES/EQUIPMENT Torch head for Mapp Gas use Gas/oxygen torch Glaskolben™ cylinder 90 COE frits and powders for decoration Ornament cap and loop set (available in gold or silver) COMPATIBILITY Glaskolben is compatible with Uroboros and Bullseye 90 COE glass frit and powders. Do not use any other COE as it may cause stress or fracture. HOWTOBLOWANORNAMENT 1. Light the torch and adjust the flame - a broader flame is better. Select a Sealed End Cylinder Glaskolben™ and introduce it into the back of the flame away from the torch. Rotate it as it is brought into the hotter area of the flame. Continue to rotate until the cylinder is glowing
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