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Core – is a cardboard or plastic spool for winding ribbon rolls, tags, labels, etc. onto it. Core size – is the internal diameter of the spool. Usually it is indicated in millimeters or inches.
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CSA (Canadian Standard Association).
ASTM D 2671 – Standard Test Methods for Heat Shrink Tubing for Electrical Use.
ASTM D 412 – Standard Test Methods for Evaluating the Tensile Properties of Vulcanized Rubbers and Thermoplastic Elastomers.
ASTM D 570 is the standard test method for determining water absorption of plastics.