Outlines the requirements for a standard ultrasonic welding test sample for thermoplastics and its welding and testing. As used in this specification, the word "shall" denotes a requirement; the word "should" denotes a guideline or recommendation; and the word "may "denotes a choice. This standard was first listed in the April 9, 1999 issue of Standards Action. It is being resubmitted due to substantive changes to the text.