Bollards are selected because of their capacity to work safely under conditions of low maintenance.
In the table below is shown a comparison between three types of bollard materials. As it can be observed, the grey cast iron is not a recommended material due its poor behavior in several aspects.
|Requirements||Ductile iron casting||Cast steel||Grey cast iron|
|Load capacity||Very good||Excellent||Good|
|Holding power||Very good||Excellent||Good|
|Low temperature rating||Fragile||Fair||Fragile|
|Long service life||Good||Excellent||Poor|