11/22/2011

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Plates Primaplex: Professional Insulation In the harsh Russian climate is good, reliable insulation of the building - an important factor ensuring a comfortable stay in an apartment building, industrial building or in any other room. Today at Russian market has no shortage of such materials. At the same time domestic production is often in no way inferior to foreign analogues. One such material - boards Primaplex, which are manufactured from extruded polystyrene. They are used for thermal insulation of walls, roofs and underground structures. Extruded polystyrene foam structure is a system of tiny isolated cell filled with a fixed carbon dioxide. Such a system makes the board more moisture resistant than any other type of insulation, and provides them with high strength. This is particularly important for structures with extremely high loads - such as underground structures deep foundations, airports, roads, etc. Another advantage of the plates Primaplex - low density (30-35 kg/m3), which makes the material very easy to use - the weight of the standard package does not exceed 10 kg. It is easy to cut, even knife or a saw, does not crumble and is not dusty, in contrast to other known insulating materials. Its easy to lay on any surface, which increases productivity by installing insulation. Allowable temperature range at which you can use the board - from - 50 C to +75 C. If he complied with the operation of facilities, the geometric dimensions of styrofoam remain unchanged for many years. Finally, the plates Primaplex, comprising an effective extinguishing additive flame retardants, are class and not readily flammable material spreading flames. If plates are used in fire safety (for example, insulating basement walls or pavement), it is recommended to use the version without the additives retardants. Thermal insulation of walls is well known that through the exterior walls out...
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Getting To Work On Wood Mechanical properties of wood mechanical strength of wood depends on many factors: species, structure, bulk density, temperature, humidity, etc. The voltage corresponding to the maximum load is tensile strength. The elastic modulus of wood along the grain, regardless of the breed it is taken in determining the deformation of structures that are protected from moisture and heat and are under the influence of constant and temporary loads E = 100 000 kg/cm2. With increased humidity and temperature "under the influence on the design of only a constant load value of the modulus of elasticity is taken as the product of the above values for the following factors: the short-term wetting of wood, with subsequent drying - 0.85, established under the influence of air temperature in the range of 35 to 50 (for example, in manufacturing plants), as well as the impact constant load - 0.80. The heterogeneity of the structure of wood and its relation to the properties of the various factors make it difficult to study its mechanical properties. A significant factor in the mechanical testing of wood is the impact of loading rate. The faster rising load, the greater is the tensile strength. On the other hand, this limit is reduced under long-term loads. At keeping the sample under load there is a gradual increase in strain, which eventually stopped (attenuated) when the load is not (over a certain limit. When the load is removed part of the deformation disappears and the the other is gradually reduced (attenuated). This phenomenon is called the elastic aftereffect, and the load limit, beyond which the phenomenon is not observed, called the limit of long-term strength of wood. Getting Started work on wood Wood - a unique material. It is very easy to process. In addition, it is durable and very lightweight...

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