Click Here for Table B BOND STRENGTH/DELAMINATION SAMPLES (Section 26-27, UL 796) - Make certain the conductor pattern that you use to build the samples reflects your rating requirements (desired Recognition). These include: - minimum external copper thickness - minimum conductor midboard and edge widths - maximum unpierced diameter - minimum thickness of laminate / B-Stage (prepreg) sheets - minimum build-up thickness - maximum internal copper thickness (if required) - plated through-holes* - plated contact fingers* * - Optional but MUST be on samples if acceptance of this type of construction is desired