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Slumping Moulds by Creative Ceramics

On the Product Page of every Slumping Mould you will find a recommended firing chart.

The Creative Ceramics moulds are designed as durable slumping & sagging moulds for glass. The specially formulated raw materials guarantee the durability even when fired several times per day!

The smooth surface accepts kilnwash uniformly and ensures the glass glides smoothly during the slumping process.

Mould Sizes

The moulds are largely made by hand. Small differences in size may be possible. We strongly recommend cutting the glass to the size measured from the actual mould rather than relying solely on the dimensions shown in the catalogue or the product sheet.

Mould Preparation: Large Moulds

Pre-firing is recommended for moulds larger than 30 cm. This process, carried out on the new mould, strengthens the inner structure and makes the mould less susceptible to thermal shock.

Segment Rate °C/h °C Hold min.
I 50 800 --

Cool the mould down to room temperature in the closed kiln.

Mould Preparation: All Moulds

Brush or spray on 4 or 5 coats of kilnwash and let dry. If you kiln-dry the mould use the following firing schedule:

Segment Rate °C/h °C Hold min.
I 350 200 20

As long as your slump firings do not exceed 720°C, there is no need to re-kilnwash the mould. If you fire at temperatures above 720°C, replace kilnwash every 3rd to 4th firing or when necessary. Gently buff of the old primer with a dry scrub pad and apply new kilnwash as above.

Firing

Place the mould on kiln post for the slumping process and make sure that the vent-holes in the mould are open. Distance to the heating elements no less than 2-3 cm. The moulds are susceptible to thermal shock (similar to glass) and should not be heated or cooled too fast (special attention is required in side-firing kilns). See below a typical slump firing cycle (Bullseye glass, size approx. 30 cm, thickness 6 mm):

Segment Rate °C/h °C Hold min.
I 200 in top firing kiln
300 in side firing kiln
500 25
II 9999 650 25
III 9999 510 50
IV 100 300 --

Variations of slumping temperatures

The tighter and deeper the profile, the more heat is required to make the glass conform to the mould.

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