(i) If any one or more tests specified in these regulations fail, two further tests of the same kind may be made on two other tubes of the same batch.  If any of these tests fails, the batch of the tubes represented may be given a further heat treatment and entire set of test shall be repeated.

(ii)  If the repeat tests are satisfactory the tubes shall be accepted.  If any failure in the tests should occur, the entire batch of the tubes shall be rejected.