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。
2
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。
3
The results show that adding glass fibre does not impair the hardness of the grinding wheel.