1.1This classification is limited to silica brick meeting the following requirements:

1.1.1Alumina (Al₂O₃) content of less than 1.50 %.

1.1.2Titania (TiO₂) content of less than 0.20 %.

1.1.3Iron oxide (FeO₃) content of less than 2.50 %.

1.1.4Calcium oxide (CaO) content of less than 4.00 %.

1.1.5Average modulus of rupture of not less than 500 psi (3.45 MPa).

1.2This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety, health, and environmental practices and determine the applicability of regulatory limitations prior to use.

1.3This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.