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ace shell thickness (tfs) and web thickness (tw) shall conform to the requirements prescribed in Table 1. TABLE 1 Minimum Thickness of Face Shells and WebsA Web Thickness (tw) NOTE 5-Web thickness (tw) not conforming to the requirements prescribed in Table 1 may be approved, provided equivalent structural capability has been established when tested in accordance with the applicable provisions of Test Methods E 72, C 1314, E 519, or other applicable tests and the appropriate design criteria developed is in accordance with applicable building codes. 5.4 Solid Units: 5.4.1 nature.com The net cross-sectional area of solid units in every plane parallel to the bearing surface shall be not less than 75 % of the gross cross-sectional area measured in the same plane. 5.5 End Flanges: 5.5.1 For units having end fianges, the thickness of each fiange shall not be less than the minimum face shell thickness. NOTE 6-Flanges beveled at the ends for mortarless head joint appli- cations that will be filled with grout are exempt astm download from this requirement. Flanges which are specially shaped for mortarless head joint applications which have been shown by testing or field experience to provide equivalent performance are exempt from this requirement. 6. Permissible Variations in Dimensions 6.1 Standard Units-For standard units, no overall dimen- sion (width, height, and length) shall differ by more than 61fi8 in. (3.2 mm) from the specified dimensions. 6.2 Particular Feature Units-For particular feature units, dimensions shall be in accordance with the following: 6.2.1 For molded face units, no overall dimension (width, height, and length) shall differ by more than 61fi8 in.
(3.2 mm) from the specified standard dimension. Dimensions of molded features shall be within 61fi16 in. (1.6 mm) of the specified standard dimensions and shall be within 61fi16 in. (1.6 mm) of the specified placement of the molded feature. NOTE 7-Molded features include, but are not limited to: ribs, scores, hex-shapes, and patterns. 6.2.2 For split-faced units, all non-split overall dimensions shall differ by not more than 61fi8 in. (3.2 mm) from the specified standard dimen
