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Square slumper Mould 8035 (20cm x 20.1cm x 1.8cm)

Price £26.64 Inc VAT (£22.20 ex VAT)

4.5 out of 5 stars (2 Customer Reviews)
 Go Back to Square Moulds 

All prices include VAT.

Stock Status: More than 10 in stock
We Also Recommend for Square slumper Mould 8035 (20cm x 20.1cm x 1.8cm):
Product Information
Mould 8035 Square slumper

Want your piece to have a smooth curve but still be stable? Try this versatile mould. It has a small base which provides stability while giving the look of an even curve.

Inner Dimensions: Length: 20 cm, Width: 20.1 cm, Height: 1.8 cm 
Outer Dimensions: Length: 21.2 cm, Width: 21.5 cm, Height: 3.7 cm

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?

For a larger square slumper, try mould 8034.


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 and HotStart Pro, 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.

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


Product Reviews
4.5 out of 5 stars
5 out of 5 stars Monday 21 November, 2016 By Jackie Watkins - See all my reviews
my favourite mould. Practical size for a useable plate Also lovely size as a display piece.
4 out of 5 stars Wednesday 11 January, 2012 By Sue Gill
I this is the one we used in a class at Warm Glass. I love the shape and bought it because it takes exactly 1/4 of a bullseye sheet so there's no waste.

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Registered office: 5 Havyat Park, Wrington, Bristol, BS40 5PA, UK
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