Those problems put the quality of case molds at risk. That's where Lafarge Prestia wants to help !
Lafarge Prestia solves many technical problems,
such as...
inconsistency of plaster setting time (too short :
workers lack time to cast properly; too long : lower molds output/shift) brings lower productivity and inconsistent quality of case-molds; therefore casting performance will be inconsistent
Some problems with resins
used in Case-mold application
Resins are not environment friendly and in some cases are
harmful for workers.
Benefits with Lafarge Prestia case-mold plasters
- Perfectly consistent setting time and strength, through formulation know-how, specific high tech process and on-line process parameters control, high frequency quality testing and ISO 9002 warranty
- Lafarge Prestia Case-mold plaster is designed to offer good bending strength, so as to yield a very strong surface to case molds and shock resistance
- Our plasters have no harmful impurities (iron, hard particles) because they are made with the purest gypsum, perfectly cleaned and we have more than 60 magnetic separators on our production lines
- Our packaging is specially designed to prevent water to get in contact with plaster powder and form hard lumps in bags
- As a water-based product, our case-mold plaster is environment friendly
- The quality/cost ratio we offer is unrivalled on the market
Lafarge Prestia Case characteristics
Lafarge Prestia Case enjoys a high popularity throughout moldshops and mold-design shops
all around Asia, as a very consistent plaster with remarkable performances and –in particular- very high mechanical strength. We will be glad to send you data sheets upon request. Please
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 Any other question ? Please Storage Temperature Contamination
Setting time and viscosity (fluidity) Strength Mixing equipment 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 Mixing ratio variations can definitely affect the performances of the moulds, especially their wear resistance and absorption.
Sprinkling and soaking Mixing With appropriate mixing equipment, speed should be between 300 and 500 rpm (and never exceed 800 rpm except for small mixers). Soaping
An up-to-date stock inventory should be done to ensure a good rotation of moulds.
Putting the moulds into service Influence of the different parameters on the final performances
Thanks to their formulation, Prestia plasters are less sensitive to working conditions than ordinary plasters. However, it is recommended to follow rigorous working procedures in
order to maintain a constant level of performance. Here is a summary of the influence of the main parameters on setting time, fluidity and mechanical strength :
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Bags must be kept dry in a closed room and must be stored so as to avoid direct contact with the ground, protected from moisture and condensation.
Notes About Mould 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.
The mixing water temperature significantly impacts on porometry and therefore absorption characteristics of the moulds. To maintain consistent performances, we recommend working at constant temperature.
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.
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.
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 equipments should be in stainless-steel, in good shape and clean before use.
The necessary quantities of plaster and water must be carefully weighed on a regularly calibrated scale.
This step is important, as it allows the powder to wet slowly and releases entrapped air. This improves the final 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.
Apply suitable mold-releasing agent.
Mould storage
Moulds should be stored in dry conditions and away from moisture, dust and heat, in order to avoid any fungal growth and to limit their ageing.
The moulds should be cleaned and soaped properly before the first usage to ensure the success of the first casts.
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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
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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…
Australia |
12 to 15 days |
Bombay |
10 to 15 days |
Jakarta |
7 to 9 days |
Kuala Lumpur (by truck) |
3 days |
Manila |
9 to 14 days |
New Dehli |
18 to 20 days |
Seoul (Inch'on) |
11 or 12 days |
Shanghai, Guangzhou |
7 to 12 days |
Singapore |
3 or 4 days |
Sri Lanka |
10 to 15 days |
Taiwan |
7 to 9 days |
Tianjin |
7 to 12 days |
Tokyo, Nagoya, Osaka |
10 to 12 days |
Viet Nam |
3 to 4 days |
Purchasing conditions
Standard packaging is 25kg bags, specially designed to preserve the plaster the longest and resist even tough handling. We supply the bags on strong pallets. Prestia Case will be shipped to you in combination with
your order of other plasters as we prefer to ship 21 tons per container (except in Korea where maximum container load is 17 tons and Tokyo harbor where maximum load is 20 tons) in order to save you transportation costs.
Purchasing conditionsSome technical tipsInfluence of the different parameters on the final performances
For any information or reclamation about this Website kindly contact our webmaster@lafargeprestia.com .