1. Look at the profile. Before we buy, the most important thing is to understand the material of its profile. Generally speaking, we usually use stainless steel materials. When purchasing, we must require that stainless steel pipes must contain a certain amount of nickel and chromium, so as to ensure that stainless steel does not rust. The thicker the pipe is, the better it is. The thicker it is, the stronger it is. If its thickness differs by 0.1mm, its compressive capacity will differ by hundreds of kilograms. Generally speaking, the strength of the anti-theft window with the thickness of 0.6mm-0.8mm in the national standard meets the standard.
2. Look at the material surface. Secondly, we need to see the process of its surface. Generally speaking, the surface color of high-quality products should be ivory white or bluish white, clean in appearance, smooth and flat in touch, free of large areas of scratches and bruises, and its welding joints are free of openings and fractures. If its color is too white or yellow, it indicates that the stability of the profile is not good, and aging and deterioration are likely to occur after a long time of use. If you find that there are white spots, black spots, cracks, burrs, peeling and other obvious defects on the surface of the aluminum alloy window, even if the price is favorable, you are not recommended to buy it.
3. Look at the hardware accessories. Generally speaking, such products with good quality use hardware fittings with good quality, so we can install them conveniently. The anti-theft window with good quality shall be equipped with complete hardware accessories, correct location, firm installation, flexible use and free opening and closing. The anti-theft windows with poor quality mostly use hardware of poor workmanship, which will lead to increased difficulty in installing anti-theft windows, poor sealing, and difficulty in opening and closing.
4. See relevant certificates. In addition, we can check whether the business has relevant sales qualifications, whether the quality of the products it sells meets the standards, whether there are corresponding production licenses and quality inspection certificates, etc. Generally speaking, anti-theft windows need to pass the double inspection of quality inspection and public security, so as to obtain the relevant "product quality inspection certificate" and "technical defense product sales license". In addition, we also need to know about the after-sales service provided by the manufacturer, that is, the warranty period, maintenance period and other service contents.