Gypsum-based plasters

Poly (2-hydroxyethyl, Et) ether Ethyl hydroxyethyl cellulose. Etulos. EMEC [9004-58-4] Useful in solvent coating applications, inks, paints and as an additive to cement and gypsum based plasters and mortars Laxative. 

Gypsum-based plaster >- Cement- or gypsum-based vermiculite >- Mineral or glass fibre > Ceramic-based products... 

Plaster of Paris is the common name for gypsum-based plaster, made by calcining gypsum q.v CaS04.2H20) at temperatures... 

Improved workability and open time of dispersion-based systems such as tape joint compounds and aqueous coatings, as well as mineral-bound building systems such as cement-based mortars and gypsum-based plasters... 

In this chapter the terms plaster and plaster material refer to the existing wall preparation regardless of its analyzed composition. We assume that the original plaster material in the tomb of Nefertari was predominantly gypsum based, not only because this material would have the desired binding properties, but also because the formation of calcium sulfate dihydrate is kinetically favored under the conditions of formation just described (38). 

Construction Soil stabilization water absorber water retention aids in cements, grouts, and tiles improvement of mechanical properties of cement and gypsum plasters and water based paints... 

Gypsum-treated muds have proved useful for drilling anhydride and gypsum, especially where these formations are interbedded with salt and shale. The treatment consists of conditioning the base mud with plaster (commercial calcium sulfate) before the anhydride or gypsum formation is penetrated. By... 

All salts are composed of two parts, of an acid and of a base. To assure myself that the acid of gypsum was that of vitriol, as I naturally presumed it to be, I placed in a small crucible some calcined pierre specu-laire along with some powdered charcoal. As soon as the material became red, the cover of the crucible became surrounded by a small blue flame. When the lid was removed, the surface of the material was seen to be covered with the same flame, and a slight odor of the volatile sul-furous acid could be detected. When the mixture so calcined had cooled, I added some acid to it. Immediately there was disengaged the odor of rotten eggs so that it was easy to identify the presence of liver of sulphur. I remade the same mixture of plaster and of charcoal in adding to it some fixed alkali, there resulted a true liver of sulphur. 

Heating limestone, CaC03, produces quicklime, CaO, which can then be treated with water to form slaked lime, Ca(OH)2, an inexpensive base for which industry finds many uses. When slaked lime is mixed with sand and exposed to the CO2 of the air, it hardens to form mortar. Heating gypsum, CaSO - 2H2O, produces plaster of Paris, 2CaS04... 

At first glance, the isotopic data, as shown in Fig. 4, would favor a straightforward interpretation based on the reduction process from two sources the first should be the gypsum bed from Mt. Mesly (or plaster imbedded in recent infillings), the second from an unknown source of sulfate with low and contents, which could be fertilizer sulfate or sulfate coming... 

Cement is a binder that sets and hardens by itself or binds other materials together. The most widely known application of cements is in construction a second one is the area of bone cements. Cements used in construction are characterized as hydraulic or nonhydraulic and mostly for the production of mortars and concrete. Hydraulic cements set and harden after combining with water. Most construction cements are hydraulic and based on Portland cement, which consists of calcium silicates (at least 2/3 by weight). Nonhydraulic cements include the use of nonhydraulic materials such as lime and gypsum plasters. Bone cements and bone cement composites refer to compounds that have a polymer matrix with a dispersed phase of particles. For instance, polymethylmethacrylate (PMMA) is reinforced with barium sulphate crystals (for radio-opacity) or with hydroxyapatite... 

Until the late 1800s, most internal plasters were predominantly lime-based. Thereafter, mixes using cement and gypsum (actually de-hydrated gypsum)... 

Gypsum plaster- Gypsum formulated to be used with the addition of sand and water for base-coat... 

Lath- A building material of narrow wood, metal, gypsum, or insulating board that is fastened to the frame of a building to act as a base for plaster, shingles, or tiles. 

---