| 摘要 |
The present invention enables formation of a small hole having a diameter of 18 mm or less and a length of 100 mm or greater, the small hole being in excellent condition upon finishing. Where the diameter of a hole 3 is D (mm), where a flexural strength (bending strength) of a mold wash that was heated until resin breakdown and then cooled back down to room temperature is σc (MPa), and where the thickness of the mold wash that is to be coated on a foam mold 2 is 1 mm or greater, the mold wash satisfies the following formula. σc ≥ -0.36 + 140 / D2 |
