ASTM C673-97(R2018) pdf free download
ASTM C673-97(R2018) pdf free download.Standard Classi fication of Fireclay and High-Alumina Plastic Refractories and Ramming Mixes
1. Scope
1.1 This classification covers fireclay and high-alumina plastic refractories and ramming mixes that can be pounded or rammed into place to form a monolithic structure. The terms “plastic”and “ramming mix” are generally intended to de- scribe the workability of the material. In this regard, plastics are considered to be materials having a workability index of more than 15 % in accordance with Test Method C181, while ramming mixes generally have less than 15 % workability by the same procedure. 1.2 This international standard was developed in accor- dance with internationally recognized principles on standard- ization established in the Decision on Principles for the Development of International Standards, Guides and Recom- mendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.N OTE 1—Chemical analysis of refractory products is determined by a combination of X-ray fluorscence (XRF) and inductively coupled plasma (ICP) using standard reference materials (SRM), including various types of minerals and refractory materials which are available from the National Institute of Standards and Technology and other appropriate sources.
3. Significance and Use
3.1 This classification defines a group of classes for use by those producing or purchasing fireclay and high-alumina plas- tic refractories and ramming mixes. Each class is limited by PCE or alumina content, or both. This classification is fre- quently used as a specification when the properties shown in Table 1 are the only items specified.
4. Classifications
4.1 Fireclay plastic refractories and ramming mixes are divided into two different classifications: (I) super duty, and (2) high duty. . 4.2 High-alumina plastic refractories and ramming aremixes divided into eight different classifications: ( 1) 60 % alumina，(2) 65 % alumina, (3) 70 % alumina, (4) 80 % alumina, (5) 85 % alumina, (6) 90 % alumina, (7) 95% alumina, and (8) 100 % alumina.
5. Basis of Classification
5.1 The properties required for compliance with a particular classification are shown in Table 1.
6. Test Methods
6.1 The determination of aluminum oxide (Al2O3) on an ignition-free basis, as required by this classification, as deter- mined by XRF and ICP. 6.2 The determination of the pyrometric cone equivalent (PCE), as required by this classification, shall be in accordance with Test Method C24.
7. Retests
7.1 Because of possible variables that may result from sampling or an unsatisfactory reproducibility of tests by different laboratories, the material may be resampled and retested at the request of either the purchaser or the manufac- turer. This could apply where the first test results may not conform to the requirements prescribed in this classification. Therefore, the final results to be used shall be the average of at least two series of tests, each of which has been obtained by following the specified testing procedures in detail.
