Specimen Molds—Molds for making test specimens
shall be 2-in. (50.8 mm) split cube molds made of noncorrodible
material and shall be sufficiently rigid to prevent spreading
during molding. The molds shall have not more than three cube
compartments and shall be separable into not more than two
parts. When assembled, the parts of the molds shall be held
firmly together, and dimensions shall conform to the following
requirements: Interior faces shall be plane surfaces with a
maximum variation of 0.001 in. (0.03 mm) for new molds and
0.002 in. (0.05 mm) for old molds; distance between opposite
faces, and height of the molds, measured separately for each
cube compartment, shall be 2 6 0.005 in. (50.8 6 0.13 mm)
for new molds or 2 6 0.020 in. (50.8 6 0.51 mm) for old
molds, angle between adjacent interior faces and between
interior faces and top and bottom planes of the mold shall be 90
6 0.5°, measured at points slightly removed from the intersection
of the faces.