| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide a pipe having silencing properties. SOLUTION: This silencing pipe comprises a hard outer pipe 1 formed of polyvinyl chloride resin having the degree of polymerization of 600-1,400; and an inner pipe 2 containing a water flow surface formed of soft polyvinyl chloride resin in which 65-220 pts.wt. plasticizer is added to 100 pts.wt. polyvinyl chloride resin having the average degree of polymerization of 1,500-6,500. The inner pipe is formed of soft polyvinyl chloride resin in which 10-220 pts.wt. a barium sulfate is further added.</p> |
