CERAMICS AND PLASTERS
Plaster molds make it possible for you to repeat complicated patterns and create forms not possible to efficiently construct using any other pottery technique. For thousands of years, potters used bisqued clay for molds but the major drawback was that they could not get a lot of detail. With the discovery of plaster in the 17th century, potters immediately saw the advantages and plaster has been the choice for ceramic molds ever since.
Calcium sulphate hemihydrate, particularly indicated for the manufacture of roller moulds in automatic machines and casting.
MIXING
The plaster/ water ratio indicated below is recommended. Less water increases strength, but less time is available for emptying. The plaster is poured into the water (never the other way around), is allowed to moisten and is mixed for approximately one minute, stirring it gently and evenly to prevent the formation of air bubbles. The recipients must be clean.
STORAGE
In dry areas on wooden slats, with spaces between rows and with the wall to ensure free air circulation. The plaster can be stored in these conditions for months without losing its properties.
ANALYSIS
PHYSICAL SPECIFICATIONS
Colour: Peach
Ph: Approx 7
Mixing Rate: 180 – 185 gr plaster / 100 gr water
Water Factor: 55 gr water / 100 gr plaster (water/ plaster ratio used to obtain results of analysis)
Start setting time: 9 -12 minutes
Finish Setting Time: 28 – 30 minutes
Setting Expansion: 2.2 mm / m
Linear Expansion: 0.25% or 0.12 % (Clients needs)
Flexural Strength: 80 kg / cm²
Brinell Hardness: 650 kg / cm²
Calcium sulphate hemihydrate, particularly indicated for the manufacture of ceramic casting moulds. Ideal for casting and roller moulds.
MIXING
The plaster/ water ratio indicated below is recommended. Less water increases strength, but less time is available for emptying. The plaster is poured into the water (never the other way around), is allowed to moisten and is mixed for approximately one minute, stirring it gently and evenly to prevent the formation of air bubbles. The recipients must be clean.
STORAGE
In dry areas on wooden slats, with spaces between rows and with the wall to ensure free air circulation. The plaster can be stored in these conditions for months without losing its properties.
ANALYSIS
PHYSICAL SPECIFICATIONS
Colour: White
Ph: Approx 7
Mixing Rate: 145 – 155 gr plaster / 100 gr water
Water Factor: 65 gr water/ 100 gr plaster (water/ plaster ratio used to obtain results of analysis)
Start setting time: 9 – 11 minutes
Finish Setting Time: 29 – 33 minutes
Setting Expansion: 2.1 mm / m
Flexural Strength: 70 kg / cm²
Compressive Strength: 190 kg / cm²
Brinell Hardness: 320 kg / cm²
The plaster (beta hemihydrate) is obtained from top-grade raw materials and the most modern baking procedures. It is suitable for the building industry.
Dihydrate purity is better than 93%.
MIXING
The plaster/ water ratio indicated below is recommended. Less water increases strength, but less time is available for emptying. The plaster is poured into the
water (never the other way around), is allowed to moisten and is mixed for approximately one minute, stirring it gently and evenly to prevent the formation
of air bubbles. The recipients must be clean.
STORAGE
In dry areas on wooden slats, with spaces between rows and with the wall to ensure free air circulation. The plaster can be stored in these conditions for
months without losing its properties.
ANALYSIS
PHYSICAL SPECIFICATIONS
Mixing Rate: 25-135 gr plaster / 100 gr water
Water Factor: 80 gr water / 100 gr plaster (water/ plaster ratio used to obtain results of analysis)
Start setting time: 9 – 11 minutes
Finish Setting Time: 30 – 35 minutes
Setting Expansion: 1.8 mm / m
Brinell Hardness: 250 kg / cm²
A calcium sulphate derivative indicated for the manufacture of press moulds.
MIXING
For press moulds, it is recommended to begin by trying a plaster water ratio of
2.9:1. The greater the proportion of plaster, the greater the strength but the lesser
the absorption.
The plaster is poured into the water (never the other way around), is allowed to
moisten and is mixed for approximately one minute, stirring it gently and evenly to
prevent the formation of air bubbles. The recipients must be clean.
STORAGE
In dry areas on wooden slats, with spaces between rows and with the wall to
ensure free air circulation. The plaster can be stored in these conditions for months
without losing its properties.
ANALYSIS
PHYSICAL SPECIFICATIONS
Colour White
Ph Approx 7
Mixing Rate 280gr powder for each 100gr water
Start setting time 14 – 1 5 minutes
Finish Setting Time 28 – 30 minutes
Setting Expansion 1.1 mm / m
Brinell Hardness 2.000 kg / cm²