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The electric breakdown strengths of thin, unsupported vinyl chloride‐acetate films in the thickness range of 1200 to 50 000 A have been measured. No dependence of breakdown strength on thickness is found in this region. Composite films composed of alternate layers of plastic film and thin conducting layers of silver show essentially the same breakdown strength as do single films. Five and six layer laminates which do not contain metal layers show a breakdown strength greater by a factor of 2 than that of single films of the same total thickness.