| 摘要 |
<p>PURPOSE:To obtain the superior tear resistance, shock resistance, and the antihumid transmissivity by forming an inner layer from the compound of polyolefine group resin such as ethylene-vinyl acetate and low density polyethylene and forming an outer layer from a laminated body made of polyamide resin, vinyl chloride resin, etc., besides polyolefine group resin. CONSTITUTION:As for the corrosion protective film which is formed by integrally composing at least two kinds of synthetic resin films having different chemical compositions and externally installed on an embedded iron pipe, the inner layer is made of polyolefine group resin, e.g. a compound selected from ethylene vinyl acetate, low density polyethylene, intermediate density polyethylene, linear low density polyethylene, high density polyethylene, and polypropylene. Further, the outer layer consists of the compound selected from a variety of polyolefine group resin, polyamide resin, and vinyl chloride resin. Accordingly, the covering is provided with the superior breakage strength, breakage depth, and humidity transmissivity.</p> |
