FOR UPPTAGNING AV DIFFUNDERBARA EMNEN LEMPLIGA HALKROPPAR, SPECIELLT BEHALLARE, BESTAENDE AV MED LACKHARTSER OVERDRAGEN PLAST, SPECIELLT POLYOLEFINPLAST, SOM ER SVAR ATT YTBELEGGA, FORFARANDE FOR FRAMSTELLNING DERAV SAM

摘要

The invention comprises a hollow body, suitable for receiving diffusible substances and made of plastics material coated with varnish resins, the external surface of which has a roughness, measured in profile according to DIN 4768, Part I, of Rz=from 2 to 150 mu m and Rmax=from 5 to 250 mu m on which a coating, positively linked with that surface to provide a seal against diffusion of liquids and gases present in the body, consisting of a chemically crosslinked polyurethane resin is located in a layer thickness of from 10 to 800 mu m.