The occurrence of premature leaks in vitreous enamel coated steel rank
s was investigated. Microscopic examination of the failed coatings sho
wed that they contained large pores and holidays. Following a plant vi
sit, it was suspected that inadequate firing of the enamel coating was
the cause of these pores. Laboratory reheating trials confirmed this
suspicion. Copyright (C) 1996 Elsevier Science Ltd.