Encore's Time Tested Tie Plugging Compound with Gauge Holding Power
Our EnduraPlug™ Tie Plugging Compound was developed in labs and tested in the field to ensure the highest quality and greatest value for our customers.
Proud Reader’s Choice Award Recipient!

We are so thankful for our peers and colleagues who comprise the Progressive Railroading audience. This recognition underscores our mission to provide the most cost-effecitve and dependable compound in the market.

Spike holes filled with EndurraPlug
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EnduraPlug Benefits

We’ve made a habit of introducing revolutionary equipment and compounds that are engineered to extend the life of your crossties. Features include:

  • 1 to 1 ratio expanding polyurethane foam.
  • Formulated to match hard wood tie density. Provides superior holding strength.
  • Easily dispensed and sets up quickly to meet production needs.
  • Can be applied in low temperatures.
  • Maintains superior spike retention and track. gauge. Proven in independent field testing.
  • Packaging can be customized to meet your specific needs.
200ml manual applicator
200ml cartridge
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How It's Dispensed

EnduraPlug is a 2 part, 1:1 mix by volume methylene di-phenyl di-isocyanate, MDI, based expanding polyurethane rigid product. It is supplied in liquid form as two separate components. A pressurized dispensing system mixes it as it is dispensed. It’s designed to fill holes and voids in wooden and composite railroad crossties so that they can be respiked or re-lagged without damaging the surrounding wood, in accordance with AREMA chapter 30 requirements.


Cure time is temperature dependent, typically reacting in 60 seconds and full cure in 5 minutes. Typical expansion is approximately 40%.

Walk-behing tie plugger
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EnduraPlug Packaging & Yield

Available in liquid form in 1500ml, 600ml and 200ml Cartridges, 5 gallon pails, 250 gallon plastic intermediate bulk containers (IBC’s). Chemicals are shipped in containers with a blanket of nitrogen gas as a protective shield from moisture. Components are sold separately in pails and totes: “A” refers to (red) isocyanate “B” refers to (blue) polyol.


Approximate Yields
200ml: 12 spike holes, 600ml: 35 spike holes, 1500ml: 85 spike holes, Combined Gallon: 430 spike holes

Encore Delivers Value
That’s why Class 1 Railroads, Shortlines, Transits and Contractors trust our compounds, equipment and service for thier crosstie life extension products.
Encore Rail Systems, Inc.
2300 West Midway Boulevard, Broomfield, CO 80020

Find more at encorers.com

Information Courtesy of Encore Rail Systems, Inc.