Traditionally, haul truck steps have steel internals with some chain or bar inside. Therefore, when they get knocked by vehicles they don’t necessarily return to their original shape.
One Era Polymers client has used hot castable polyurethane to manufacture strong haul truck steps. The verticals were produced using Erapol E83A, as this is a flexible polyurethane. Because of this, they will be able to withstand impacts.
The rungs required less flex but needed to be strong to take the weight of the drivers. They were made from Erapol E95A polyurethane.
The mounting points are steel bushed and represent the only other material used in this job.