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How about the beautiful qzbw25s-9 type front filter 50? The front filter is a filter installed in the water meter to face the whole house water, which can intercept large particles such as sediment and rust.1. imported from Germany, the filtration accuracy is 40 microns, and the filtration accuracy in the same industry is the highest.2. the laminated filter screen is 2.5 times the filter area of similar products.3. long service life, 30-50 years.4. siphon backwashing and Flushing are more thorough.5. manual cleaning is required regularly without electricity and water. The power supply and water are automatically required. it is easy to use. The Flushing time is set and will be automatically washed at the specified time. Solid workmanship, full of materials. The net weight reaches 2 kilograms of terror! The product is used for primary filtration of domestic water and drinking water. Effectively protect water pipes and water equipment to avoid faults and corrosion damage caused by impurities such as rust p
What is the electret material? 50 -.The common dielectric polarization occurs under the action of the external electric field. when the electric field is removed, the polarization of the dielectric disappears.The electret is a dielectric with a long-term charge. its charge can be a polarized charge that is 'frozen' due to polarization, or it can be a positive and negative charge that is trapped on the surface or in the body.Similar to the permanent magnet with residual magnetism after the steel rod is magnetized, people also call the dielectric with long-term reserved charge Yongdian, which is used to be called electret.In 1919, the Japanese naval University, Taro Kawaguchi, made the electret for the first time.At that time, the Brazilian palm wax was mixed with the same amount of pine, and some beeswax was added to melt to 130 degrees Celsius, plus the electric field of 15 kV per centimeter. after cooling and solidification, the electric field was removed and the electret was made.This
