Main characteristics HDPE is a highly crystalline, non-polar thermoplastic resin. HDPE in its raw state has a milky white appearance with a degree of translucency in micro-thin sections. Certain types of chemicals are chemically corrosive, such as corrosive oxidizers (concentrated nitric acid), aromatic hydrocarbons (xylene) and halogenated hydrocarbons (carbon tetrachloride). The polymer is non-hygroscopic and has good water vapor resistance for packaging applications. HDPE has very good electrical properties, particularly high dielectric strength, making it well suited for wire and cable applications. Medium to high molecular weight grades are impact resistant, at room temperature and even at temperatures as low as -40F. The properties of the various grades of HDPE are an appropriate combination of four basic variables: density, molecular weight, molecular weight distribution, and additives. Different catalysts are used to produce customized special performance polymers. These variables are combined to produce HDPE grades for different applications; a balance in performance is achieved. Product properties HDPE is, tasteless, odorless white granules with a melting point of about 130°C and a relative density of 0.941 to 0.960. It has good heat and cold resistance, good chemical stability, also has high rigidity and toughness, and good mechanical strength. Dielectric properties, resistance to environmental stress cracking is also good.
PE pipe characteristics: PE water supply pipe characteristics.
1、Long service life: under normal conditions, less life up to 50 years.
2、Good hygiene: PE pipe, no heavy metal additives, no scaling, no bacteria, very to solve the problem of secondary pollution of drinking water. In line with the provisions of GB/T17219 safety evaluation standards and the relevant health and safety evaluation provisions of the State Ministry of Health.
3、Can resist the corrosion of a variety of chemical media: no electrochemical corrosion.
4、Smooth inner wall, very low coefficient of friction, the medium's ability to pass through the corresponding increase and has excellent wear resistance.
5、Good flexibility, high impact strength, resistant to strong shock, distortion.
6、Light weight, convenient transportation and installation.
7、Electrofusion connection and hot melt butt joint, hot melt socket connection technology makes the interface strength high with the body of the pipe, to ensure the safety and reliability of the interface.
8、The welding process is simple, convenient construction, and the comprehensive project cost is low.
9、PE environmental health water supply pipe dn20 ~ dn90 for blue, dn110 or above for blue or black with blue line, other colors need to be customized, the color of accessories and pipe color corresponds.
10、Low water flow resistance: HDPE pipe has smooth inner surface, its Manning coefficient is 0.009. Smooth performance and non-adhesive characteristics ensure HDPE pipe has higher conveying capacity than traditional pipe, and also reduces the pressure loss of pipeline and energy consumption of water transmission.
HDPE water pipeline in the application of matters that should be noted
1, Outdoor open-air laying, with sunlight, it is recommended to do shading measures.
2, Buried HDPE water pipeline, DN ≤ 110 pipeline installation in the summer can be slightly snake laying, DN ≥ 110 pipeline because there is sufficient soil resistance, can resist thermal stress, no need to set aside pipe length; winter, are not required to set aside pipe length.
3, HDPE pipeline installation, if the operating space is too small (such as: pipe wells, ceiling construction, etc.), should use electrofusion type connection.
4, Hot fusion socket connection, the heating temperature can not be too high, too long, the temperature is best controlled at 210 ± 10 ℃, otherwise it will cause too much extruded molten slurry within the fittings, reducing the internal diameter of the water; socket fittings or pipe interface should be clean and clean, otherwise it will cause the socket off leakage; at the same time, pay attention to control the angle and direction of the fittings to avoid causing rework.
5, Hot melt butt connection, the voltage required between 200 and 220V, if the voltage is too high, it will cause the heating plate temperature is too high, the voltage is too low, the butt machine can not work properly; butt should keep the interface alignment, otherwise it will cause the butt area is not enough requirements, the strength of the weld is not enough, as well as the rolled edge is not into; heating plate heating pipe interface is not handled clean, or heating plate has oil, mud and other impurities, will cause the interface off leakage; heating time to control, heating time is short, the pipe does not absorb enough time, will cause the weld edge rolled edge is too small, heating time is too long, will cause the weld edge rolled edge Too large, there is a risk