abstract |
A lubricant sheet suitable for use in a process of making a hole in a printed circuit board, which sheet comprises a water-soluble polymer layer, which has a thickness of 0.02 to 3.0 mm, and a metal foil having a thickness of 0.05 to 0.5 mm, nsaid water-soluble polymer layer being formed on one surface of said metal foil, wherein said water-soluble polymer layer is formed of a mixture of at least one water-soluble polymer and an organic filler (V). |