 Supraduro is a formulated hemihydrate plaster
(CaSO4.1/2H2O) produced from naturally occurring gypsum mineral. It is white in colour.
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 It is used in the ceramics industry to produce working moulds for the slip casting of tableware and sanitaryware.
It can also be used for the production of working moulds for the automatic forming of clay.
Used for general casting of decorative plasterwork and modelling applications.
Used as an ingredient in proprietary formulations.
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The technical data outlined represents typical figures only.
| Vicat ring spread @ pwr, by weight,
of 1.61:1, 100/62
| 17 to 22 cm
| Knife setting time @ pwr of 1.61:1
| 10 to 15 mins
| Data at pwr of 1.61:1
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| Compressive strength, dry
| 15.0 MN/m2
| Flexural strength, dry
| 6.1 MN/m
2
| Brinell hardness, dry
| 25.0 MN/m
2
| Linear expansion,
2hrs after setting
| 0.24 %
| Pore volume
| 43.0 %
Sieve Analysis
| Sieve
| % weight retained
| + 200 microns
| max. 0.04 %
| + 90 microns
| max. 4.0 %
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 This plaster can be modified to suit the specific requirements of the customer.
Unless otherwise stated, Formula’s standard test methods apply. To obtain a copy of the test methods used, please contact Formula directly.
The plaster to water ratios quoted are those used in Formula’s standard test methods and are not necessarily those used in practice. 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.
The recommended plaster to water ratio is between 1.49:1 and 1.61:1, with a mixing time of approx. 2 to 4 minutes, depending on batch size.
Plaster based products are not recommended for conditions where they are likely to be located externally or in any way subjected to weathering or excessive dampness.
When stored under dry conditions, this product will have a shelf life of six months from the date of manufacture that is displayed on each sack.
Absorption of moisture can result in changes to physical properties including a reduction in the set strength of plasters and also a lengthening of setting time. To help protect the product during use, open or part used bags should be carefully folded and closed.
Each bag is date stamped and stocks should be rotated so that the oldest material is used first.
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