The surface is yakeli get together fat of third acerbity armour the reverse side uses colophony gesso to add fibre glass in order to enhance its hardness.

亚克力表面为聚丙酸甲脂，背面采用树脂石膏加玻璃纤维，以增强其硬度。

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Glass fiber encryption tensile strength increases, the more enhance bubble board with size, surface hardness and easy construction land mark fixed tube.

玻璃纤维加密抗张强度增大，更增强泡沫板硬度，表面带有尺寸标记，易于施工固定地热管。

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The results show that adding glass fibre does not impair the hardness of the grinding wheel.

结果表明，玻璃纤维的加入不影响树脂磨具的硬度。

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This is because glass has the hardness of crystal materials while also having a disordered arrangement of molecules like a liquid.

VOA: special.2009.09.16

The non-scratch touch surface is made of reinforced glass with a hardness of 5.5 Mohs, to ensure it has the durability to withstand use in schools, hospitals, and public access areas.

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