A Voluntary Product Standard published by the department under these procedures shall be assigned an appropriate number for purposes of identification and reference. Public notice shall be given regarding the publication and identification of the standard. A voluntary standard by itself has no mandatory or legally binding effect. Any person may choose to use or not to use such a standard. Appropriate reference in contracts, codes, advertising, invoices, announcements, product labels, and the like may be made to a Voluntary Product Standard published under these procedures. Such reference shall be in accordance with such policies as the Department may establish, but no product may be advertised or represented in any manner which would imply or tend to imply approval or endorsement of that product by the Department or by the Federal Government.