Medium Drop Out Ring
Make different depth bowls and vases using this fantastically versatile mould. Experiment with different glass designs to discover the beautiful patterns which can be created by the dropping glass.
Size: 23cm outer diameter x 13cm inner diameter. Fits in Skutt HotStart Pro kiln or bigger.
Bullseye Code: 8623
Examples of work using drop out rings, from one of our Amanda Simmons Masterclass courses
Also available in small and large circular sizes, as well as in a square format.
Please Read: This firing recommendation has been calculated using Bullseye Glass with a thickness of 6 mm in a Paragon GL24 kiln, and is courtesy of Bullseye Glass Co.
*A visual check of the kiln should be made during this point. As soon as the drop out has lowered to the desired point, crash cool the kiln to approximately 600°C and continue the schedule as per segment 2 above.
- Small kilns may require the process temperature reducing. In the Hobbyfuser and HotStart Pro, reduce the top temperature from 677C to 654C. In the Firebox 14, reduce the top temperature from 677C to 634C. All kilns vary, as does glass viscosity. Testing is necessary.
- Side firing kilns may require more time in the first ramp than top firing kilns.
- Bubbles in slumping are caused by firing too high or holding too long at process temperature.
- Cracked moulds or cracked glass is caused by firing too fast in the first ramp or cooling too fast.
- Devitrification on the outside of a slumped piece is caused by firing too high or holding too long at process temperature.
- The blank should cover the outside edge of the mould but not hang over the edge
- For drops under 10cm the optimum thickness of the blank is 6mm to 9mm
- For drops over 10cm the optimum thickness of the blank is 9mm to 12mm
- Fire the blank on a basic full fuse and anneal correctly for the thickness of the glass
- Use Bullseye shelf primer on the dropout mould and also 1mm fibre, cut 3mm back from the mould edge
- The optimum top temperature is 650C to 700C depending on your kiln, glass thickness and how much you want to drop
- In plugin kilns remove the shelf for longer drops but remember to protect the base of the kiln with fibre paper
Please note that all our moulds are hand-made and therefore the dimensions may vary slightly from those shown. Mould manufacturers allow a tolerance of up to 2cm. We strongly recommend cutting the glass to the size measured from the actual mould rather than relying solely on the dimensions shown.
All our moulds are designed for multiple use and with care should last for many firings.