![]() ![]() As a rule of thumb, if a decision to make a cast is made despite this clear warning, use no more than two layers of scrim impregnated with plaster, e.g. Making a cast enclosing any part of the body using this material is potentially very dangerous, particularly if the thickness of the cast exceeds a few millimetres. Skin damage can result at much lower temperatures, perhaps as low as 45 degrees centigrade, if contact is prolonged. ![]() Temperatures as high as 60 degrees centigrade can be reached. On contact with water, this material hardens and then slowly becomes hot. The use of warm or hot water will accelerate the chemical hardening process, which may prove hazardous if the materials harden too rapidly while pupils are still handling the plaster slurry or sheets. Plaster impregnated scrim pieces (Mod-Roc) are placed in cold water for seconds to absorb water, before being placed and formed over the armature and the surfaced smoothed, usually by hand.Ĭold water is used to ensure sufficient working times. In powder form, Plaster should always be mixed by adding the powder to cold water, never water onto powder. Plaster of Paris hardens through a chemical reaction initiated through contact with cold water or even dampness in the air. Plaster of Paris is available in two basic forms, as a white powder sold typically in 1, 10 and 25 kilo bags, or as a form of plaster impregnated bandage/scrim, sold in cut sheets, small rolls and multi-roll packs. It should be used within 9 months from the date of manufacture.Plaster of Paris is a versatile material for three-dimensional work. Maximum 20 bags should be stacked on top of each other in a dry place, and the bags should be stored in such a way that they do not come into contact with the ground and are protected from moisture and condensation. The plaster removed from the mold is left to dry for a while at room temperature before assembly. The plaster, which is heated and cooled, leaves itself from the mold after a while. The plaster poured into the mold will begin to heat up after a while. Plaster is poured over the laid fiber or hemp again. After a layer is poured, fiber or hemp is laid on the plaster to increase the flexibility and strength of the mold. The prepared mortar is poured into the mold that has been lubricated beforehand. It is mixed with a hand mixer or trowel until a homogeneous mixture is obtained. It is waited for about 2-3 minutes for the plaster to absorb the water. Care should be taken to avoid drafts.-Application temperature should be between +5 and +40 C.Ħ,5 – 7 liters of water is poured into the container to be mixed, and Karonat Papier-mâché Plaster is added by sprinkling it. The surface of the ceilings should be roughened before applying the plaster or primed with a material that allows the mortar to adhere to the surface. Extremely dry, hot and highly absorbent surfaces should be moistened with water. It must be free from dirty materials such as dust, oil, paint. TSE EN 13279-1.2 (Type C1, Fiber reinforced, building plaster for plaster elements) KARONAT can be used both in plaster molding and plastering paste. ![]() It is a building plaster used in the production of decorative materials such as papier-mâché, core, niche, jamb and sculpture.
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