Infrastructure- Railroads

HMI is the foam of choice, for rail bed sub grade repair. Rail Bed Stabilization Foam is a heavy duty polyurethane foam specifically designed for jobs where water or moisture is present. This foam was designed to set up in the presence of water and to maintain strength in wet environments.

Rail Bed Stabilization Foam can be used for…

  • Tracks
  • Bridges
  • Crossings
  • Culverts
  • Anywhere there is a weak sub base present

A slower reaction time makes HMI HF402 Hydro insensitive Foam great for Deep Foamjection allowing the material to spread further before curing. As foam reacts it will follow vein fissures and voids. A custom installed solution to make soil stronger.

Deep Foamjection™ is quick, ready to use immediately and long lasting.

When soil settles, the core issue is the inability of the sub-grade to support the slab, or ground above. The job of the sub-grade is to have enough bearing capacity to evenly support the slab. Rail beds are designed to support constant vibration and traffic.
Deep Foamjection is the process of injecting a two part polyurethane foam into those failed soils. Injected as a liquid, the polyurethane foam expands and pushes out on and into the weak soils. This expansion will take the path of least resistance as it travels. This expansion will follow voids, fissures or weak/loose soils. As it travels it takes the shape of a tree root. This volume of expanded foam increases the density and strength of the soils that failed as well as adding a solid custom installed volume of foam.

DCP Test (Dynamic Cone Penetrometer)
This tool allows HMI contractors to test soil compaction both before and after the work is performed. By testing soil conditions before the work is performed the size of the area can be determined as well as the depth, allowing for precise soil stabilization. By testing after the work is completed, installers can quantify the work performed and provide the results to the customer. DCP units can be “hand held” or truck mounted for larger projects

Fast Facts About Rail Bed Stabilization Foam

-Never Changes Shape

-Will Not Absorb Water- Closed Cell Foam

-Environmentally Friendly
(Cured foam is inert, does not leach hazardous chemicals into water)

-90-100 PSI


-Chemically Resistant

-Lasts Forever

-Can only be damaged by sunlight

Deep Foamjection is installing a stronger foundation to support DEMANDS OF RAILROAD traffic & vibration

Reduce Liability

Safety is the number one priority in railroad transportation

Eco Friendly

HMI foam leaves the smallest carbon footprint vs all other poly’s on the market

Overtime all infrastructure needs to be repaired

Unlevel structures are often hazardous and at times require a long shut down. HMI understands the importance of safety and stands behind our Deep Foamjection process to repair and stabilize unlevel concrete and repair failing soils.

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There were approximately 160 feet of rail that needed to be lifted as much as 2”. The concrete lifting contractor used HMI HF402 hydro insensitive foam on this project to raise the track and stabilize the substrate. Besides filling voids and solidifying the loose soil, if there is water present, HF 402 will displace the water and create a stable base for the track to sit on.

During the process, the rails are monitored closely using a rotary laser level. This monitoring assures that “over lift” does not occur. The contractor completed this in one day, saving the railway company thousands and more importantly avoiding a shut down.



When railroad service roads are used, railway work can be performed up to 250’ away from the Polyurethane system causing minimal interruption to rail traffic. When a train has to pass through the work site the equipment can be removed and the track cleared in under 10 minutes.
– When polyurethane systems are in place the work site could be cleared and the systems are mobilized in under 15 minutes.
– HMI Polyurethane systems can be equipped with both laser levels as well as water levels allowing for the monitoring of any movement of the rails.