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Qingdao Construction Material Research Institute Co., Ltd. -- Polyethylene double wall corrugated pipe inspection
Date:2017-12-06 10:01:00 Source: Browsing times:
Inspection items: appearance, minimum mean inner diameter, minimum lamination wall thickness, minimum inner wall thickness, ring stiffness, ring flexibility and oven test are all evaluated according to GB/T19472.1-2004 standard. All items above are qualified.
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