| 摘要 |
PROBLEM TO BE SOLVED: To provide washing pieces capable of be properly used for a car wash brush, and surely washing a car body without scratching the same by applying a polyolefin resin as a main material of the washing pieces forming a car wash brush, and controlling physical property values such as hardness, an open cell rate and tensile strength of the obtained foam. SOLUTION: This washing pieces is composed of polyolefin resin foam the tensile strength of the polyolefin foam is determined within the rang of 0.5-1.2 MPa, its open cell rate is determined to be 10% or less, and its 25% compressive hardness is determined to be 0.2 MPa or less.
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