Light Weight Concrete Masonry Units manufactured by Chicopee Mason Supplies, Inc / R. Ducharme, Inc, Chicopee, MA shall comply with requirements of the current issue of the following standards and with other requirements specified herein.
1. Hollow & Solid Loadbearing Units: Shall comply with all provisions as ASTM C90-96a, Type I, Class I, Moisture Controlled Units.
2. Compressive strengths: All units shall have a minimum compressive strength on the net area of 1900 PSI when tested in accordance with ASTM C-140
3. Light Weight Concrete Masonry Units: Shall be manufactured using expanded shale aggregate conforming to ASTM C-331 specifications for "Lightweight aggregate for concrete masonry units".