Keramicast

Keramicast is a formulated hemihydrate plaster (CaSO4.1/2H2O) produced from naturally occurring high purity gypsum mineral. It is off-white in colour. It is used for the production of fibrous plasterwork and GRG. It is also traditionally used in ceramics for the production of working moulds for both jiggering and slip casting

Benefits

Working properties suitable for both casting of decorative plasterwork and the production of working moulds for ceramics

Produces good strength fibrous plasterwork pieces

Good reproduction of fine detail

Markets

Fibrous and Decorative Plaster

Ceramics

Applications

Fibrous plaster

Tableware

Technical data

Mechanical Properties
Brinell Hardness (MPa)	60
Dry compressive strength (Mpa)	22
Pore Volume (%)	30%

Chemical Properties
Chemical Composition	CaSO₄.1/2H₂O
Chemical Name	Calcium sulphate hemihydrate
Colour	off-white

Physical Properties
Compacted bulk density (kg/m3)	1360
Loose bulk density (kg/m³)	960
Particle Size (% weight retained)	3.5% at 150 µm 13% at 90 µm 23% at 63 µm 40% at 32 µm

Setting Parameters
Final setting time (minutes)	12
Initial setting time (minutes)	8
Linear Expansion (%)	0.28
Vicat Ring Fluidity (cm)	19

Plaster to Water Ratio
Plaster to water mix ratio (by weight)	100/56
Plaster to Water Ratio (by weight)	1.79:1
Water to plaster ratio ( by weight)	56%

Instructions for use

Please use with the recommended plaster water ratio, with a mixing time of approx. 2 to 4 minutes. The precise consistency to use will need to be adjusted to suit the individual application. Changes to plaster to water ratio will influence product performance particularly setting time and strength.

Packaging and shelf life

Bag

Packaging available : 25 kg

Shelf life : 6

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