Since the beginning of 1980s,the aluminum doors and windows came out in our country.And because of its light-weight,corrosion resistance,it is become popular and  replace the one made in steel. The aluminum alloy is made of every metals,and is possessed with the irreplaceable advantages.It has the light weight,high strength,thus,it can be extruded into a variety of new complex cross-section materials used in various periods.The new patented color stainless steel anti-theft window can overcome the poor anti-theft performance of the existing window in the market,which is very easy to be rust and in the dull color.Not only color diversity and never being rusty,the internal use of the steel through standard parts assembly,in addition to  enhance the performance of anti-theft more decorative.The grade of products will be improved obviously.But in the past two years,the plastic steel doors and window is developed very fast,which has caused the obvious impact on the window and door hardware accessories.

In some opinion,the thermal conductivity of the aluminum frame is very high,thus,it is not good for heat insulation.But the plastic is with thermal insulation,thus,it can save the energy.In response to this statement,the experts think that the heat insulation is mainly affected by the glass,not about the materials of the frame.
1. Sound insulation
According to the information,the sound insulation of the plastic steel door and window is better than the aluminum door and windows’.For example,for the building that meets the  same noise requirements,the distance between the door hardware accessories must be 50 meters away from the main road,and if the windows and doors are made of plastic steel,the distance can be reduced to less than 16 meters.
2. Heat insulation
According to the search,as a normal room with the air conditioner turned on,it is stated that the room installed with the plastic steel door and window save 5 kw/h per day than those with aluminum door and window.
3. Corrosion resistance
The acid and alkali resistance and corrosion resistance of plastic steel door and window can  protect the doors and windows from the erosion of the city environment pollution,acid and souring rain.But the aluminum will be surface oxidation easily after corrosion,and its service life will be shortened.
4. The service life of the doors and windows
The weight of the plastic door and window is lighter than the aluminum door and window.Thus,it is easy to be shaped,and be installed.And for the service life,the service life of the plastic steel door and window is 30 to 50 years,which is lower than the aluminum door and window.