1.1该分类仅限于满足以下要求的硅砖:氧化铝（Al2O3）含量低于1.50%。二氧化钛（TiO2）含量低于0.20%。氧化铁（FeO3）含量低于2.50%。氧化钙（CaO）含量低于4.00%。平均断裂模量不低于500 psi（3.45 MPa）。 1.2本标准可能涉及危险材料、操作和设备。本标准并非旨在解决与其使用相关的所有安全问题。本标准的用户有责任在使用前制定适当的安全和健康实践，并确定监管限制的适用性。

1.1 This classification is limited to silica brick meeting the following requirements: Alumina (Al2O3) content of less than 1.50%. Titania (TiO2) content of less than 0.20%. Iron oxide (FeO3) content of less than 2.50%. Calcium oxide (CaO) content of less than 4.00%. Average modulus of rupture of not less than 500 psi (3.45 MPa). 1.2 This standard may involve hazardous materials, operations, and equipment. This standard does not purport to address all of the safety problems associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.