Coal Combustion and Gasification Products is an international, peer-reviewed on-line journal that provides free access to full-text papers, research communications and supplementary data. Submission details and contact information are available at the web site. © 2011 The University of Kentucky Center for Applied Energy Research and the American Coal Ash Association Web: www.coalcgp-journal.org ISSN# 1946-0198 Volume# 3 (2011) Editor-in-chief: Dr. Jim Hower, University of Kentucky Center for Applied Energy Research CCGP Journal is collaboratively published by the University of Kentucky Center for Applied Energy Research (UK CAER) and the American Coal Ash Association (ACAA). All rights reserved. The electronic PDF version of this paper is the official archival record for the CCGP journal. The PDF version of the paper may be printed, photocopied, and/or archived for educational, personal, and/or non-commercial use. Any attempt to circumvent the PDF security is prohibited. Written prior consent must be obtained to use any portion of the paper’s content in other publications, databases, websites, online archives, or similar uses. Suggested Citation format for this article: Ilyushechkin, A., Roberts, D., Harris, D., 2011, Compositional Variations in Pilot Gasifier and Laboratory- Produced Slags and their Impacts on Slag Viscosity and Coal Assessment. Coal Combustion and Gasification Products 3, 22-27, doi: 10.4177/CCGP-D-10-00009.1