2011年12月19日星期一

In comparison to the traditional moncler coat men

Plastering is still very much in use today even if it is an ancient art. Plaster is a natural product, hydrated gypsum, with a the chemical formula of CaSO4.2H2O. This dries up to be the fine white powder which may be mixed with additional water and shaped. It has traditionally been used for interior walls, and to create ornate trims. Fresco, a painting technique is based on this where images are painted while the plaster is still wet.

The plaster was often stabilized by the addition of materials such as animal hair, or a base such as fabric. Exterior walls may be plastered with powdered limestone (stucco).A pre-formed plaster board also known as drywall or sheet rock is used to make many modern interior walls. In comparison to the traditional techniques these are easily installed by nailing to studs or joists, and having the joints and nail heads hidden by plastered tape. The entire surface may be covered with a thin coat of plaster, called veneering alternatively.

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