What are the methods to distinguish the top and bottom of screen window?
2017-09-26 11:17:22 COMMENT：0 HITS：
It is very simple to distinguish the top and bottom of the window screen. The following three methods you can refer to:
1, there is no smell, normal PVC material will not appear pungent smell.
2, the top as tight as possible wrapped in profiles, placed in a high temperature conditions for a period of time, to observe the surface of the profile and the top of the contact surface is not stained discoloration, the top of the surface of the dust there is no yellow oil seepage.
3, the general price cheaper top filling agent will be more, the surface will not be very bright, so cheap and appearance is not bright, as far as possible not to choose.
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