A note from the manufacturer:
Glen-Gery molded bricks are typically manufactured to conform to the requirements of American Society for Testing and Materials (ASTM) Standard Specification C 216, Grade SW, Type FBS and all grades of ASTM C 62. These products also conform to the requirements of ASTM C 216, Grade MW. Certain products meet the requirements of ASTM C 216, Type FBA, ASTM C 902, or ASTM C 32. Inquiries should be made for specific applications or conformance to standards other than ASTM C 216 or C 62.
Glen-Gery molded bricks are manufactured to provide specific dimensional tolerances. The dimensional tolerances of the product are intended to be within the requirements of ASTM C 216, Type FBS for general use. The product ordered will generally contain a number of units which are over or under the specified dimensions. The dimensional variations are related to the raw materials, forming, drying and firing processes, and the desired finish and color. Thus, for some products, all the units may be slightly over or slightly under the specified dimensions. Inquiries should be made regarding the dimensional variations which might be expected if project detailing requires precise coursing. Specialty products or gauged products may be desirable for such applications.
Glen-Gery molded bricks are often referred to as ‘sand struck’ meaning that sand is used as a lubricant to release the clay from the molds and as a way to provide different colors. These “sand-struck” brick are produced with varying degrees of sand on all surfaces except one bedding surface.