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What Are The Methods For Distinguishing The Top Or The Top Of Screens?
Apr 10, 2018

It is very simple to discriminate the top or the top of the screen. Here are three ways you can refer to:

1, no smell, normal PVC material will not appear pungent smell.

2, the top as tight as possible wrapped in the profile, under the conditions of high temperature placed for a period of time, to observe the surface and tops of the contact surface has defaced discoloration, the top surface of the dust has no infiltration of oil yellow.

3, generally cheaper than the top filling agent will be more, the surface will not be very bright, so cheap and the appearance of not bright as far as possible not to choose.