On specimens made of fiberglass with a thickness of 2.2, 5.4, and 11.0 mm, obtained by autoclave molding, studies were carried out to assess the regularities of changes in the values of the microhardness of the matrix along the thickness of the specimens. The studies have established that the value of the microhardness of fiberglass samples along their thickness from the front surface of the sample to the back surface changes according to a parabolic law with maximum values in the core, and that, with an increase in the thickness of the sample, the value of the microhardness of the matrix also increases. An assessment of the stability of the values of the microhardness of the matrix in different places of a fiberglass sheet with a length of 3 m, as well as sheets of the same thickness, molded individually and in a five-layer package, is given. It was found that the methods of forming sheets of fiberglass within the framework of the experiment did not affect the values of the microhardness of the matrix.
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