Slumping Mould 8136 Spherical bowl (20.5cm diameter)
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EasyCut Glass Circle Cutter

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Spherical Bowl Mould 8136 (19.3cm diameter x 2.3cm)

86% of 100
£27.70 £23.08
More than 10 in stock
Spherical Bowl Mould  

Create beautifully rounded bowls (without a flat base) using this mould.

Want to make an appealing, perfectly rounded bowl without the fuss of cutting circles? Try slumping a pre-cut 20cm circle into this beautifully simple mould.

While as a decorative piece movement can be a positive attribute, for more stability you could add bumper stops or rubber pads to the base of your finished bowl, or secure with Museum Gel.

Inner Dimensions: Diameter: 19.3 cm, Height: 2.3 cm 
Outer Dimensions: Diameter: 19.9 cm, Height: 3 cm 
This mould fits in the HotStart Pro kiln.

Bullseye Code: 8736

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.

Will this mould fit in my glass kiln?

We stock a range of 20cm transparent and opalescent pre-cut circles measured to fit this mould.  


Firing Schedule:

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. 

Segment Rate (C/hr) Temp. Hold
1 167C 657C :05
2 999 482C 1:00
3 56C 371C :00


  • Small kilns may require the process temperature reducing. In the Hobbyfuser and HotStart Pro, reduce the top temperature from 657C to 634C. In the Firebox 14, reduce the top temperature from 657C to 614C. All kilns vary, as does glass viscosity. Testing is necessary.

  • Remove the shelf when slumping in small kilns.

  • 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.

All our moulds are designed for multiple use and with care should last for many firings.

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