Newcast 71

Newcast 71 is a formulated hemihydrate plaster used in the ceramic industry to produce working moulds for the slip casting of tableware and sanitaryware when an excellent surface aspect and a good absorption capability are needed. It can also be used to produce working moulds for jiggering in tableware.This product can be used with both conventional batch mixing systems as well as automatic continuous plaster blending machines

Benefits

Fine particle size, Excellent surface smoothness

Good balance between absorption, consistent mould life

Markets

Ceramics

Applications

Sanitaryware

Tableware

Technical data

Mechanical Properties
Brinell Hardness (MPa)	28
Dry compressive strength (Mpa)	15
Pore Volume (%)	40%
Wet Compressive strength (Mpa)	7

Physical Properties
Bulk density (compacted) kg / m³	1100
Loose bulk density (kg/m³)	700
Particle Size (% weight retained)	2% at 90 µm 5% at 63 µm 25% at 32 µm

Chemical Properties
Chemical Composition	CaSO₄.1/2H₂O
Colour	white

Setting Parameters
Final setting time (minutes)	11
Initial setting time (minutes)	8
Linear Expansion (%)	0,23
Vicat Ring Fluidity (cm)	19

Plaster to Water Ratio
Plaster to Water Ratio (by weight)	1.52:1
Water to plaster ratio ( by weight)	66%

Instructions for use

The recommended mixing time is approx. 2 to 4 minutes, depending on batch size.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, strength and permeability.Depending on quality and preparation, the clay has a varying tendency to stick to the mould. Therefore the pwr may be adjusted within the above ranges. Depending on the quantity, the tendency to stick increases as the pwr increases. When inserting on the press, the lowest ratio should be tested first, followed by increasing increments to determine the optimum ratio.

Packaging and shelf life

Bag

Packaging available : 25 kg

Shelf life : 6 months

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