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Classification and application of glass fiber mesh cloth
- A new type of alkali resistant product after drying with acrylic acid copolymer.s
How often are you supposed to change windshield wiper blades?
- the ice cream truck alarm. Then fat kids will tackle the criminal and he will be accused of pedophilias
What kind of plastic is the bumper of the car made of?
- At present the domestic automobile bumper is generally used (modified) toughened polypropylene (PP) material as raw material injection molding polypropylene (propylene) - Poly (commonly known as PP plastic material), has a high melting point (up to 167 DEG C), heat density (0.90g/cm3), is a kind of general plastic in the light, there is the high corrosion resistance (tensile strength 30MPa), strength, rigidity and the transparency of its products are relatively well characterized, disadvantages are poor low temperature resistance (by impact PP copolymer, Styrene Elastomer and polyolefin rubber modified materials, 3 kinds of blend composition with high rigidity, impact resistance, scratch and coating, injection molding bumper after loading, 8 km/h impact fragmentation, and has restored flexibility, performance and cost is decreased almost PU, 10%~20%).s
What are the construction principles and raw materials of tempered glass?
- Any of the above factors are closely related to the heating and cooling conditions of glass. When the glass is uniformly heated to the tempering temperature, it suddenly cools down. Because of the different cooling rate of the inner and outer layers, the surface layer cools and contracts rapidly, while the inner layer cools and contracts slowly. As a result, the inner layer is subjected to compressive compressive stress and the surface layer is subjected to tensile stress. As the glass continues to cool, the surface has hardened and stopped shrinking, while the inner layer is still cooled and contracted until the room temperature is reached. In this way, the surface layer is compressed by the compression of the inner layer, and the inner layer forms tensile stress and is permanently retained in the tempered glass. Because the glass is strong and weak tensile compressive brittle material, when the glass is broken more than tensile strength, so the size and distribution form of stress is the main factor influencing the strength of glass and crack. In another case, when the glass is cooled in a plastic state, whether it is uneven heating or uneven cooling, as long as there is a temperature difference on the same piece of glass, there will be different shrinkage. At room temperature, the higher the temperature, the greater the cooling, and the greater the shrinkage, the shorter the glass. On the contrary, the lower the temperature is, the less the cooling, the smaller the shrinkage, and the longer the glass. If a piece of glass is short of each piece, the board must be warped. In this way, it is not difficult to understand why glass is deformed and how to prevent deformation.s
can geomembrane reach A-class seepage-proof?
- the seepage-proof effect of project composite geo-membrane is mainly depends on the interlayer, the norms of seepage-proof geomembrane is 100-1500g/square meter, in order to guarantee the good seepage-proof effect, the thickness of geomembrane should be less than 500g/ square meter, outer geotextile should be less than 300g, too thin geotextile will reduce the sand stone resisting effect, increasing geomembrane's thickness and prevent sand stone corrosion will influence the seepage-proof effect of geomembrane, composite geo-membrane's norms is less than 800g/square meter, which can reach the seepage-proof standard.s
How to quickly distinguish tinplate and ordinary substrate iron?
- Tinplate is the substrate, iron tin plating, tin bright, the substrate is dark, the substrate for a few days rust, and the two put together, the difference is great.s
What items and detailed procedures should be inspected for valve size inspection?
- Valve body structure length and flange size, GB size, the implementation of GB/T12221-2005. American Standard. (the American Society of mechanical engineers ASME B 16.10-2000).s
What should I do with the plastic window part of the toy packaging?
- Regular trash unless the type of plastics is clearly labeled.s