The surface composition of the tempered sight glass and the surface structure are closely linked, the two are causal, in general, the chemical composition of the decision structure, but also can not ignore the impact of structure on the composition.

(1) the chemical composition of the tempered sight  glass surface chemical composition of the glass surface and the glass body (the whole) of the chemical composition of a certain difference, that is, along the glass cross-section (depth) of the composition of the content is not constant, its composition changes with depth.


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