---
title: Polyurethane Foam for Seawall Repair - Technical Details
description: Repair sea walls instead of replacing them.  Stop high flow leaks, fill voids behind seawalls, and bind loose soil with AP Fill 700.  Let's take a look at a few basic technical details...
---

[Alchatek Infrastructure Repair Blog: Polyurethane Leak Seal Injection, Soil Stabilization, Concrete Leveling ](https://info.alchatek.com/blog)

# [Polyurethane Foam for Seawall Repair - Technical Details](https://info.alchatek.com/blog/polyurethane-foam-for-seawall-repair-technical-details)

 Written by [Andy Powell](https://info.alchatek.com/blog/author/andy-powell) | Jul 16, 2018 3:21:19 PM

Repair sea walls instead of replacing them by stopping high flow leaks, filling the voids behind concrete structures and binding loose soil with:

[AP Fill 720](https://alchemy-spetec.com/geotech/soil-stabilization-products/ap-fill-720-water-cut-off-void-fill/) & [AP Fill 700](https://alchemy-spetec.com/geotech/soil-stabilization-products/concrete-filling-resin-ap-fill-700/) — innovative, cost effective, water activated, low viscosity, simple to use closed cell polyurethane injection resins.

## Proven Strength

- Because these foams are impermeable to water once in place, the likelihood of future erosion is vastly diminished versus other commonly used fill materials.
- Originally developed over 30 years ago, and continuously improved since, this technology has one of the longest histories of success in the field among engineering uses of polyurethane foams.

## Environmentally Friendly

- Phthalate free.
- Approved for contact with drinking water.

## Quick Set Time vs Cement Grout

- AP Fill 700 & 720 foams set in 10 minutes or less.
- Cement grout takes hours to days.

## Differences Between 700 and 720

- 720 has a higher expansion ratio and is more flexible when cured.
- 700 has a lower viscosity, so it works better in cooler temperatures.

Want a complete technical breakdown of AP Fill 700 & 720 for seawall repair?

 

[View full post](https://info.alchatek.com/blog/polyurethane-foam-for-seawall-repair-technical-details)

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