The profile quality of window of window of model steel: Should observe the profile appearance, the color should be green and white, rather than the white that usually people think, pay attention to the profile color of the frame and fan of upvc frames for windows is consistent, the appearance is uniform, the distribution of cavity is reasonable.  

Window of model steel door profiles formula is usually to add calcium carbonate as padding material, and some manufacturers for cost reduction, such as too many addition amount, became the calcification of plastic, the plastic doors and Windows no surface luster, slightly rough, hard and brittle, looks kind of like a stone rugged feeling, the normal window of model steel door, surface luster, usually very resilient.