(a) Standards available on loan. Duplicates of the United States Standards provided by the Department for classifying and grading rosin in commerce, shall remain the property of the Department, and may be loaned, but not sold, to such interested persons as may be approved by the Administrator. Any interested person desiring the loan of duplicates of the United States Standards for rosin shall submit to the Administrator a form application, properly signed, which will show his interest in naval stores and his eligibility to receive and use such duplicates, in accordance with the provisions in this part. Standards so loaned shall be returned promptly on request.

(b) Standards available for purchase. Duplicate cubes for rosin standard grades XA, XB, and XC are not available from the Department but may be obtained commercially.