ASTM C903-08

The properties of refractory castables can be affected by their method of installation. This practice attempts to minimize the variables encountered during installation by pneumatic gunning.

This practice provides parameters to produce gunned specimens for use in other ASTM test methods.

This practice may be used to produce specimens for acceptance testing, service evaluation, manufacturing control, and research and development.

Differences between various kinds of equipment and the differences in procedures and operator techniques may result in significant variations in the physical properties of the gunned specimens. It is recommended that the same operator use the same equipment to produce specimens for referee testing agreed to by the involved testing parties. The specific operating parameters should be shown in the report.

Although this practice is specifically designed for refractory castables containing calcium aluminate cement, it may be used with minor modifications for gun mixes containing other bond systems.

1.1 This practice covers a procedure for preparing refractory castable specimens usually containing calcium aluminate cement with or without metal fibers by cold nozzle-mix gunning. Specimens prepared in accordance with this practice are intended for use in standard ASTM test methods required for evaluating gunned materials.

1.2 The values stated in inch-pound units are to be regarded as the standard. The values given in parentheses are provided for information only.

1.3 This 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 and health practices and determine the applicability of regulatory limitations prior to use.