Plastic steel doors and windows are a new generation of doors and windows materials. Because of their advantages of high wind pressure resistance, good airtight watertightness, low air and rain penetration, low heat transfer coefficient, heat preservation, energy saving, sound insulation, and aging resistance, they are rapidly replacing Steel windows, aluminum windows.
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1, the structure of steel doors and windows. Plastic steel doors and windows are mainly made of hard PVC (PVC) plastic profiles, plus off-duty hardware. The profile is a porous cavity, and the main cavity has inner lining steel made of cold-rolled steel plates to increase the strength of the steel doors and windows. Profile wall thickness should be 2.5 mm or more.
2, the manufacture of plastic doors and windows. Plastic-steel doors and windows are generally manufactured at the factory using special steel cutting and welding equipment. They are semi-automated and automated. The quality can be guaranteed.
3, buy plastic doors and windows notice.
(1) Do not buy cheap steel doors and windows. Good plastic doors and windows have higher plastic quality, inner lining steel quality and hardware quality, and their service life can reach more than ten years. The use of low-cost steel doors and windows profiles, calcium carbonate content of more than 50%, additives containing lead salts, poor stability, and affect human health. The inner lining steel is a hot bar plate, the thickness is not enough, some even do not have inner lining steel, glass, hardware also have bad products. The service life is only two or three years.
(2) Pay attention to surface quality. The color of plastic profiles on the surface of doors and windows is blue-white or ivory white, clean, smooth and smooth. There are no scratches or bumps on the large surface, and there is no welding or fracture at the welding joint. The surface of the good quality steel doors and windows should have a protective film, and the user should tear off the protective film before use.
(3) Pay attention to glass and hardware. The glass should be smooth and dry. The glass and plastic profiles are not in direct contact and there is a sealing bead that closes the gap. The hardware is complete, the position is correct, the installation is firm, and the use is flexible.
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A pH meter is a scientific instrument that measures the hydrogen-ion activity in water-based solutions, indicating its acidity or alkalinity expressed as pH.
The pH meter measures the difference in electrical potential between a pH electrode and a reference electrode, and so the pH meter is sometimes referred to as a "potentiometric pH meter". The difference in electrical potential relates to the acidity or pH of the solution. The pH meter is used in many applications ranging from laboratory experimentation to quality control.
Soil pH is a measure of the acidity or basicity (alkalinity) of a soil. pH is defined as the negative logarithm (base 10) of the activity of hydronium ions (H⺠or, more precisely, H₃Oâºaq) in a solution. In soils, it is measured in a slurry of soil mixed with water (or a salt solution, such as 0.01 M CaClâ‚‚), and normally falls between 3 and 10, with 7 being neutral. Acid soils have a pH below 7 and alkaline soils have a pH above 7. Ultra-acidic soils (pH < 3.5) and very strongly alkaline soils (pH > 9) are rare.
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