e. Glass, including fused silica, phosphate glass, fluorophosphate glass, zirconium fluoride (ZrF4) and hafnium fluoride (HfF4), having all of the following:
e. 具备全部下列特性的玻璃，包括熔凝氧化硅、磷酸盐玻璃、荧光磷酸盐玻璃、氟化锆（ZrF4）以及氟化铪（HfF4）：