ã€China Aluminum Industry Network】 1. Thickness: There are 70 series and 90 series aluminum alloy sliding doors. The aluminum alloy sliding door inside the house can be used with 70 series. The series number indicates the thickness of the door frame thickness in millimeters. Aluminum alloy sliding window has 55 series, 60 series, 70 series, 90 series four. The series selection should be based on the size of the window hole and the local wind pressure value. Aluminum sliding windows used as closed balconies should not be smaller than the 70 series.
2. Strength: Tensile strength shall be 157 Newtons per square meter and the yield strength shall be 108 Newtons per square millimeter. When you buy, you can use your hands to bend the profile moderately, and you should be able to recover after loosening your hands.
3. Color: The same aluminum alloy color should be the same, such as the color difference is obvious, that is not suitable for purchase.
4. Flatness: Check the surface of aluminum alloy profile, there should be no depression or bulging.
5. Gloss: aluminum alloy doors and windows to avoid the purchase of surface bubbles (white spots) and ash (black spots), as well as cracks, burrs, peeling and other obvious defects in the profile.
6. Degree of oxidation: The thickness of the oxide film should reach 10 microns. When you purchase, you can lightly stroke the surface of the profile to see if the oxide film on the surface can be wiped off.
Stainless Steel Washer Metal Washer are short spacers, usually round in shape, either drilled through or with a threaded hole. Some washers are produced with features that inhibit spinning/loosening, such as split washers, or toothed washers, and others are made of bent or beveled material that act as springs. Washers can be used to provide spacing between parts, allow a wider contact area when fastening with screws, provide thermal or electrical isolation, inhibit loosening, or provide a small degree of spring pressure.
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