Mould 8036 Square slumper (11.5 x 11.5 x 1cm)

Square Slumper Mould 8036 (11cm x 11cm x 1.5cm)

Mould 8029 Round Slumper (30cm Diameter x 3cm)

Round Slumper Mould 8029 (29cm Diameter x 3cm)

Spherical Bowl Mould 8134 (28cm diameter x 7cm)

100% of 100
£55.25 £46.04
8 in stock
Spherical mould

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

Finding it hard to cut big circles? Try our 28cm clear pre-cut circle to fit this mould.

Diameter 28cm x 7cm - fits in Hotstart kiln

Bullseye Code: 8734

Will this mould fit in my glass kiln?


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/hour) Temperature Hold
1 167C 649C :20
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 649C to 626C. In the Firebox 14, reduce the top temperature from 649C to 606C. 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.

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.

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