This standard applies to two classes of core-spun thread made of continuous multifilament polyester yarns covered with cotton or with polyester, soft or glazed finish, intended for use in hand and machine sewing.

The testing and evaluation of a product against this standard may require the use of materials and/or equipment that could be hazardous. This document does not purport to address all the safety aspects associated with its use. Anyone using this standard has the responsibility to consult the appropriate authorities and to establish appropriate health and safety practices in conjunction with any existing applicable regulatory requirements prior to its use.