Lafarge Prestia solves many technical problems,           
such as...

• details of the model not reproduced: molds made out of low strength plasters can not keep all the details of the model for a long time; after a few cycles, some details disappear.
• too brittle product: low strength plasters yield a too brittle surface, which will easily break during handling and transportation.
• surface problems: hard particles or color particles in the plaster will destroy the surface of your product.
• inconsistency: inconsistency of plaster setting time (too short : workers lack time to cast properly; too long : lower products output/shift) brings lower productivity and inconsistent quality of products.
• not white plaster: not white color plaster will make the work difficult when white color dolls or objects have to be produced
• too hot plaster slurry: some plasters slurry release a  too high temperature that can even burn your hand sometimes. 
• set plaster lumps: plaster badly protected from moisture will have lumps that will destroy surface of clayware.

Those problems put the quality of figurines, statues or dolls at risk. They also cost a lot of money in waste, loss of productivity, complaints from customers, etc… That's where Lafarge Prestia wants to help !

Benefits with Lafarge Prestia plasters

• Our plaster delivers very high strength, thanks to a specific process and the use of special chemical agents. Therefore, our plaster will reproduce every details of your design and the quality of the surface will be perfect.
   
• Furthermore, the high strength of our plaster will make your products resistant to handling and transportation tough conditions.
   
• Thanks to the whiteness of its raw material (gypsum), Lafarge Prestia can produce the whitest plaster. Furthermore, our high tech process enables us to separate the foreign particles and other impurities from the plaster.
   
• Our plaster has a progressive hydration mechanism, which does not release as much heat as in the case of plasters made with older generation processes. Therefore, plaster slurry temperature will not reach a high level and the slurry will not be too hot to handle.
   
• Our plaster contains no harmful impurities (iron, hard particles) because it is made with the purest gypsum, perfectly cleaned, and because we have installed more than 60 magnetic separators on our production lines.
   
• Our plaster has a perfectly consistent setting time, through formulation know-how, specific high tech process and on-line process parameters control, high frequency quality testing and ISO 9002 system.
   
• Our packaging is specially designed to prevent water to get in contact with plaster powder and form hard lumps in bags.

Lafarge Prestia product range

Lafarge Prestia Modell TH

Prestia Modell TH is specially designed for producers of plaster figurines, dolls, statues, etc... It will reproduce the finest details of the silicone mold. Its purity and whiteness are unrivalled on the market. Prestia Modell TH offers a very high strength and shock resistance.
As a water-based product, it is environment friendly, whereas the competitors' products based on polyester resin are a nuisance to our planet. Further more, Prestia Modell TH is inflammable, unlike its resin-based competitors.

We will be glad to send you data sheets upon request. Please contact us now.

Our standard payment terms are Telegraphic Transfer before delivery or irrevocable Letter of Credit. We are currently preparing the possibility for customers who find it more efficient to pay through internet with credit card.

We will be glad to give you a price quotation. Please contact us.

Meet our team on our Customer Assistance page

Any other question ? Please contact us.

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Some technical tips

• The most important and most simple : Use correct plaster/water mixing ratio !
• Sprinkle plaster into water slowly and allow it to soak for one minute.
• Mix the plaster-water slurry 2 to 4 minutes maximum by hand or mixer.
• Blade type (size and shape) stirring time and speed, water purity and plaster/water ratio have an influence on working time, mechanical strength and porosity of hydrated plaster.

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Notes about objects Casting

To obtain the best from Prestia plasters, rigorous and precise mixing conditions are essential.  Any variation can modify plaster setting mechanisms and affects the porosity and mechanical strength of the moulds.

Temperature
The mixing water temperature significantly impacts on setting time.  To maintain consistent performances, we recommend working at constant temperature.

Contamination
It is preferable to use a water as clean as possible in order to limit the introduction of soluble salts which could be prejudicial to the moulds quality.  It is recommended to work with drinkable water.

Setting time and viscosity (fluidity)


As well as consistency, the Prestia range of plasters offers a wide choice of setting times and fluidities.  The control of the setting time (short or long) is essential to meet the needs and requirements of the mold shop.
 

Strength
The homogeneous and compact structures of Prestia plasters allow a high mechanical strength development and will commonly give 50% superior shelf life, as compared to that of ordinary plasters.  Moreover, the use of Alpha plaster gives the possibility to increase the mixing ratio and to contribute to a better mould strength.

Mixing equipment
Mixing equipments should be in stainless-steel, in good shape and clean before use.
Use preferable a propeller with axial flow (boat propeller type) or with 4 blades at 45 to pull down the mixed plaster slurry without turbulence.
The motor power should be strong enough to provide a constant rotation speed.  
Ideally, the motor should be equipped with a speed variator in order to adjust the propeller speed to the slurry viscosity and completely mix it (no stagnant area on the surface).

Mixing ratio
The necessary quantities of plaster and water must be carefully weighed on a regularly calibrated scale.

Mixing ratio variations can definitely affect the performances of the moulds, especially their wear resistance and absorption.

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Sprinkling and soaking
This step is important, as it allows the powder to wet slowly and releases entrapped air.  This improves the final mixing.

Mixing
Mixing conditions must be controlled in order to avoid any variations in the mould quality.  They are adjusted (speed and duration) to obtain a good and complete circulation of the slurry.  The uniform dispersion of the plaster grains will give a homogeneous mix with no lumps.
With appropriate mixing equipment, speed should be between 300 and 500 rpm (and never exceed 800 rpm except for small mixers).

Casting
To avoid any air entrapment, the mixed slurry should be cast slowly at constant speed.  The pouring lip should be close to the case mould and the slurry should be poured on one side of the case mould.

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Our logistic know-how, our flexibility in production and our location very close to Bangkok harbor (Laem Chabang) enable us to offer short delivery time to Asian countries. Examples of shipping time between Laem Chabang and…

Weight and volume in relation with the mixing ratio

Purchasing conditions

• Standard packaging is 40 kg bags, specially designed to preserve the plaster the longest and resist even tough handling.
• We supply the bags on strong pallets.

For export markets, we prefer to ship 21 tons per containers (except in Korea where maximum container load is 17 tons and Tokyo harbor where maximum load is 20 tons).

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Purchasing conditions

Technical tips

Notes About objects Casting

Weight and volume in relation with the mixing ratio

More tips

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The data presented in this document are in accordance with the present state of our knowledge, but do not absolve the user from carefully checking all supplies immediately on receipt. We reserve the right to alter product constants within the scope of technical progress or new developments.

The recommendations made here should be checked by preliminary trials, because of conditions during processing over which we have no control, especially where other companies' raw materials are also being used.

Prestia is a registered trademark of Lafarge Prestia

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