| Nr. | Informations-beschreibung | Link |
| 1. | Planungshandbuch für Industriekunststoffe, Georg Fischer GmbH | http://www.gfps.com/content/gfps/country_DE/de/support_and_services/planning_assistance/planning_fundamentals/planning_fundamentals_industrial.html |
| 2. | Produktinformationen Polypropylen, Georg Fischer GmbH | http://www.gfps.com/content/gfps/country_US/en_US/products/piping/polypro-sys/progefstd.html |