Slope Block Products:   TEL .(805) 376 9924 FAX .(805) 499 0864 280 ASTA AVE. NEWBURY PARK CALIFORNIA 91320 U.S.A. E-MAIL slopeblock@aol.com Natural Gravity Walls   For additional technical information refer to the International Conference of Building Officials, Report No. ER-5863. Materials used in manufacturing Slope Block shall conform to the following: Concrete shall have a minimum compressive strength of 4,000 psi in accordance with the ASTM C-140 testing procedures.   Cement - ASTM C-150 (Portland Cement). Aggregates - ASTM C-33 (Washed, graded sand, and rock).   contact - products - projects - features - home   SLOPE BLOCK TEL .(805) 376 9924 FAX .(805) 499 0864 Home Page ..www.slopeblock.com  280 ASTA AVE. NEWBURY PARK CALIFORNIA 91320 e-mail slopeblock@aol.com Copyright © 1999 & 2000. Slope Block, Inc.. All rights reserved.