Our FlexPost-SM™ product line is composed of high-density polyethylene (HDPE). Polyethylene, (C2H4)n,is one of the most produced plastics in the world. Trash bags, tubes, and bottles are all created using polyethylene. Specifically, high-density polyethylene is used in milk bottles, children’s toys, and cutting boards. HDPE is stiffer and stronger than other types of polyethylene because of its high crystalline structure. The high crystalline structure results from a lack of branches that allow polymer chains to stick closely to one another during the production process.

Similar to other great discoveries, polyethylene was produced on accident in the late 1800’s. However, mass production and true appreciation of polyethylene would be seen many decades later. During World War II, polyethylene was used secretly as an insulating material for military radar. Over the next few years, the secret of polyethylene got out and was produced commercially. Production and demand grew exponentially due to its strength, impact-resistance, and durability.

HDPE No Logo

How it’s made

Polyethylene is produced by cracking naphtha in crude oil. Cracking is simply using heat to break down hydrocarbons.  Ethylene is released through this heating process. The gas is then liquified and pushed through small holes of a plate. While solidifying, the polyethylene is cut into small pieces that will be eventually melted down to be used in various products. The density of polyethylene can be manipulated by applying varying degrees of pressure during the production process. Higher density polyethylene is created by applying lower pressure while lower density polyethylene results from higher pressure.





Solid polyethylene (Photo Source)




FlexPost-SM™ (HDPE)

The rigid nature of HDPE allows our products to remain light weight yet extremely strong and flexible even after repeated collisions with a vehicle. Our products are able to withstand impacts of up to 60 miles per hour due to the strength and durability of polyethylene. The HDPE in our guideposts and delineator paddles is not only impact-resistant but UV-resistant. This allows our products to remain in direct sunlight without becoming brittle or weak.

Follow us on Twitter (@Flexpost_Inc) and like us on Facebook (FlexPost Inc) for more parking industry news and history!

Scroll to Top