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Square Slumper Mould 8034 (25.5cm x 25.5cm)

£44.65 £37.21
8 in stock
Square Slumper Mould  

Looking to make something stylish and simplistic? This mould is ideal for creating a decorative dish. It has a small base which provides stability while giving the look of an even curve.

Size: 25.5 x 25.5 x 2cm

Bullseye Code: 8634

Please note this mould does not fit in the HotStart Pro if using the shelf provided with the kiln. Ideal for firing in the Skutt Firebox 14.

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/hr) Temp. Hold
1 167C 638C :05
2 999 482C 1:00
3 56C 371C :00


  • Small kilns may require the process temperature reducing. In the Hobbyfuser reduce the top temperature from 638C to 615C. In the Firebox 14, reduce the top temperature from 638C to 595C. 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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