Division 5.2.5 F1 United Kingdom Original text. Later amendments are not shown. The Permeability Factor is the difference between HC 20W and HC 3W in g/24 h with 3 digits. Annotations Textual amendments F1 Substituted by Commission Regulation (EU) 2017/1221 of 22 June 2017 amending Regulation (EC) No 692/2008 as regards the methodology for the determination of evaporative emissions (Type 4 test) (Text with EEA relevance). ← Division 5.2.4 Division 5.2.5 Division 5.2.6 →