To produce high-quality tents, use high-strength fabrics – nylon and polyester. Until recently most people believed that the tent made of polyester has better performance characteristics, but thanks to modern technologies for the treatment of tissue the situation has changed. For example, the view was that nylon polyester inferior in resistance to ultraviolet rays. K Also characteristic of nylon stretch under the influence of moisture and shrink when it evaporates, but the nylon fabric is softer, which gives it strength with significant physical exertion. Having said that, despite the recent treatment of the fabric, nylon price category lower than that of polyester. Now, people are constructing the tent claim that nylon, having a special treatment is not inferior to polyester, and by some measures, and surpasses it. Now the industry to improve the operational capabilities of products using several types of treatment and impregnation of tissue. These coatings to improve the strength properties of the material – significantly increases the resistance to water, tear, UV radiation, which leads to longer service tents.
Coatings for fabrics: – PU coating for internal surfaces of fabrics. To improve the water resistance of tissue to its internal surface applied to PU – polyurethane coating. Thanks to 3000 mm awning fabric can protect even against heavy rain, the effect is achieved by applying the double impregnation polioritanom, there is still a figure of 5000 mm, which uses a triple impregnation. With each new layer of impregnated fabric is heavier and more expensive. Paul Price is often mentioned in discussions such as these. The applied in factory conditions PU – coverage does not fall off, does not crack and is a long time. PU has a number of impregnation advantages: a large range of opposing water, refers to a low-cost, durable has (she gives 2L laminate), is compatible with antipozharnymi treatments can be carried out sizing and sealing with with tape. The drawbacks of this coating can be attributed weak UV protection.
The main advantages of metal structures in comparison with the design of other materials are: reliability, lightness, impermeability, industrial, and ease of modernization, repair and reconstruction. Reliability of metal structures provided a close match characteristics of steel to our ideas about the ideal elastic or elastic-plastic isotropic material for which strictly formulated and proved the basic provisions of the strength of materials, elasticity and structural mechanics. Go to 
How often should I change the water filter all water filters are divided into several types: 1st gross mechanical purification. The diameter of the holes of 50 microns and above. In general, they mesh and do not require replacement. They need to be just cleaned or washed in an acid solution. 2nd fine mechanical purification. Filtration of 5mkm. They are made of polystyrene or wound fibers. 
It originated in the historical development of man under the influence of labor. "At first, labor – Engels wrote, – and then with him articulate speech were the two most important stimuli under the influence of which the brain gradually evolved apes in the human brain … "With the emergence and development of speech originated and evolved human capacity for abstraction and generalization. "Every word (speech) is generalization ", – wrote Lenin. The word 'tree' summarizes all trees, regardless of the specific differences in their essential characteristics. The word "person" summarizes all people, regardless of their nationality, sex, age, etc. 
But the hydrophobic effect is not the only interesting property of water. In what follows we will find others. And why is water a chemical so privileged? The answer, of course, lies in the molecule and its interactions with the environment. Filed under: 
All human beings have positive and negative qualities that giving away our existence in this world, the positive qualities make us “better people” and thus transcend all those around us in a positive way, adding attitude and being model or example worthy of imitation, but unfortunately not as positive those qualities that we also make all those with whom we share part of our existence. Usually all those attitudes that do not like the others, ourselves, are those that try to hide, thinking that this is one of the reasons why we criticize, reject or possibly even take advantage of us , causing us to come to feel undervalued, poorly understood and even sometimes not respected. The feeling in this way obliges us by all means we have available to us, seeking to present a different picture, which we now assume we are going to be accepted, respected, valued and not to feel loved. It would be worth reflecting, if not since childhood was where we learned to make use of these masks, which present a different image of ourselves, or perhaps at our stage of maturity where to feel empty, lonely or sad, motivates us to use the mask of “everything good, “where we hide our feelings, because that to others pretend that everything runs smoothly. Perhaps check out 
High degree of impregnation of sodium silicate indicates that at lower concentrations moisture in the solution (due to dilution) in a gel form and covers the surface of the surrounding sand, creating a sealer, and a solid shell. Fine-grained, including refractory material in model compositions, such as fireclay powder, Marshall, zirconia well suited for creating a sealing layer and at the same time antiburning. A mixture of powders of different grain angularity and enhances these effects. In the foundry used dozens of compositions of water antiburning coatings, some of which are supplied to TU in the form of a concentrate (powder / paste in bags / drums) for dilution with water. They contain refractory filler and binder (bentonite often), and in one way or another suitable for introduction into the model, then building coverage – impregnated layer forms. 