Standard Practice for Pressing and Drying Refractory Plastic and Ramming Mix Specimens

Abstract

3.1 This practice is useful for producing uniform specimens of refractory plastics and ramming mixes for use in standard ASTM tests. Samples thus formed may be used for referee testing when setting specifications between producer and user. Establish by mutual agreement and specify in the report the forming parameters such as sample size, workability, and forming pressure when referee testing. 3.2 This practice is applicable for preparing test specimens of various sizes. Note that 9 in. by 41/2 in. by 21/2 in. (228 mm by 114 mm by 64 mm) samples, because of their large cross section, have a greater tendency to form flaws during pressing, handling, and drying than smaller cross-sectional samples. 3.3 The purpose of this practice is to minimize flaws in pressed specimens. It is not intended to duplicate all field installation conditions. 3.4 Variations in workability as determined by Test Method C181 can significantly affect the number of flaws contained in a specimen. Establish by mutual agreement the workability level when comparing tests between two laboratories. 3.5 This practice is not intended for preparing specimens of basic ramming mixes, anhydrous tap-hole mixes, nor resin-bonded mixes.