MATERIAL FOR PROCESSING AND MOLDING MEMBER USING MATERIAL FOR PROCESSING

Provided are a material for processing which is significantly improved in vibration damping performance, sound insulation performance and sound absorption performance and is capable of reducing the weight of, and improving the mechanical strength of, a product, and a molded member using such a material for processing. With a metal cover 1a, a thin metal plate 6 for forming a material 24 for processing has many through-holes 22. Thus, the material 24 for processing has the through-holes 22 in itself. When the material 24 for processing vibrates and air passes the through-holes 22, the energy is attenuated by the friction of an end face 32 which is a part of each of through-holes 22 of the material 22 for processing and the air. Therefore, the energy of sound wave, which is vibration of air, is converted into thermal energy, and so the sound absorption performance is provided. The frequency band in which the sound absorption performance is provided is determined based on the size and shape such as equivalent hole diameter D1 of the through-holes 22, the numerical aperture, the thickness of the plate and the like.