Plastic steel doors and windows are a new generation of door and window materials, which have the advantages of high wind pressure resistance, airtight water tightness, small air and water penetration, low heat transfer coefficient, heat preservation and energy saving, sound insulation and heat insulation, and are not easy to aging. Experts remind consumers to pay attention to: First, do not buy cheap plastic steel doors and windows. It is understood that good plastic steel doors and windows can last for more than 10 years, while the price of cheap plastic steel doors and windows is only two or three years. Second, attach importance to surface quality doors and windows. The surface of the plastic steel profile is white or ivory white, clean, smooth, smooth, no scratches on the large surface, bumps, no welding and breaking of the welded joints, and the surface of the plastic steel doors and windows with good quality should have a protective film. Third, attach importance to glass and hardware. The glass should be flat, water-free, glass and plastic steel profiles are not in direct contact, there is a sealing bead to close the gap, the hardware is complete, the position is correct, the installation is firm, and the use is flexible. fiber optic lights,led series light price,led point light,bright source downlights HSONG LIGHTING CO,. LTD , https://www.wallwasherlighting.com