The clay model
Clay materials come from a wide range of sources to facilitate the low price through the "mud washing" process and "refining process" its texture is more delicate. Clay has a certain degree of adhesive plasticity, which can be modified repeatedly in the process of shaping, and it is convenient to make up. Can also reuse is a kind of ideal model material, but if the moisture in clay lose too much easier to make the clay model appear shrinkage cracking or even fracture phenomenon is not conducive to long-term preservation. In addition, the effect of processing on the surface of the clay model of the method are not many, when the clay model must choose less sediment concentration, before use must be processed repeatedly, the mud and cooked, convenient to use. Commonly used as sculpture, molds with mud. 
Sludge is an artificial material. It is very soft, soft and hard after solidification. The clay is more malleable, more viscous and more ductile than the clay. It is easy to use when shaping, sculpture and dressing can be done at will during the molding process, and it is not easy to dry and crack after forming, and can be used repeatedly. Putty is expensive and easy to carry. It is more suitable to make some small, irregular and curved shapes. Generally, it is very convenient to use sludge for car and boat modeling. Therefore, it is a wise choice to use brown sludge as the outermost layer of sludge. The main ingredients of sludge are talc powder 62%, vaseline 30% and industrial wax 8%.
Gypsum is economical in price, convenient in use and processing, used in ceramics, plastics, model making, etc. Gypsum is fine in texture, easy to repair surface decoration after forming, easy to keep for a long time, suitable for making all kinds of required models, easy to display.
Plastic is a new material commonly used to make models. There are many kinds of plastic, there are more than 50 kinds of main types, and thermoplastic plastic is the most widely used in model making, mainly PVC, polystyrene and ABS engineering plastics
Material, organic glass plate, foam plastic plate, etc. Polyvinyl chloride has low heat resistance and can be formed by pressing, blowing and casting. The melting point of ABS engineering plastics is low. It is easy to soften it when heated by electric ovens and electric ovens. The organic glass has the characteristics of good photocompatibility, light quality, high strength, bright color and convenient processing, and is easy to be preserved after forming.
The wood we use is usually the raw wood and artificial board after secondary processing. Man-made board often has plywood, particleboard, joiner board, medium density fiberboard and so on. Models of furniture are often made of wood.
Use steel material to apply most, if all sorts of specification steel and steel, conduit material, board material, sometimes a few also use a few other metal material such as aluminium alloy. The production of metal model materials is mainly concerned with mechanical properties and cost. The mechanical properties are mainly considered from the aspects of strength, elasticity, hardness, stiffness and anti-impact tensile ability of metal materials. The metal model processing technology mainly includes cutting, welding, casting, forging and so on. Due to the limited processing conditions in the laboratory, there are few metal model process options.
The comprehensive model
The materials used to make the model are not only one kind of material, but also two or two kinds. Produced by the above material, through comprehensive processing, but still a material as main ingredient, the other is the use of the local, make model, integral feeling is good, the adornment of the late processing is convenient. Like a plaster sculpture of the telephone, the screen will use some transparent organic glass window, can be opposite cut and paste some pictures, so that to achieve the effect of realistic, and button, you can choose some organic glass round bar, and then work section cut out is the same size and thickness of buttons, produced good results. There are other materials, such as fiberglass, foam, etc.
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