Cylinder test specimens must have flat and level end surfaces perpendicular to the cylinder body to assure compression test accuracy. The cylinder ends may be either ground or capped to achieve conformity with ASTM C 617.

The DGSI Vertical Capping Set provides all the needed items for capping 6 x 12 inch (15.2 x 30.5 cm) concrete cylinders

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Vertical Capping Set, 110 V, 60 Hz
Set Includes
C-2756 x 12 in Vertical Capping Fixture
GO-2304 qt. Warming Pot, 100 V, 60 Hz
G-29105Capping Ladle, stainless steel, 8 oz.
C-246Carrier for 6 x 12 inch cylinders
G-153Dual Scale Thermometer
Related Items
C-280Capping Compound (powder), 50 lb. (23 kg) bucket
C-281Capping Compound (ingot), 50 lb. (23 kg) box
C-282Hi-Strength Capping Compound (chips), 50 lb. (23 kg) bag
G-530Hi-Temp Cotton Gloves

ASTM C 31, C 192, C 617 AASHTO T-23, T-126.