3.1 This practice is provided in the interest of facilitating the transition of dimensional practice for standard refractory brick and shapes from inch-pound units to metric (SI) units.

3.2 The standard dimensions are based on a 38-mm module (taken as the equivalent to 1.5 in.) and are developed with the aim of preserving a modular relationship between the dimensions of the principal rectangular refractory shapes.

1.1 This practice covers dimensions in millimetres for standard series refractory brick and shapes of all compositions.

1.2 A standard method for converting all other dimensions of shaped refractory articles from inch-pound to SI units is included.

1.3 The values stated in SI units are to be regarded as standard. The values given in parentheses are for information only.