---
title: Lifting Foam Density and Expansion
description: The most common slab lifting foams we sell are AP Lift 430, AP Lift 440, and AP Lift 475. Each foam has a different density and load bearing capacity. They also have different expansion properties. The higher the density of foam, the lower the amount of expansion (yield). Read more...
---

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

# [Lifting Foam Density and Expansion](https://info.alchatek.com/blog/lifting-foam-density-and-expansion)

 Written by [Andy Powell](https://info.alchatek.com/blog/author/andy-powell) | Apr 12, 2019 5:16:58 PM

 

Today I'd like to discuss a little "foam 101" info that addresses some commonly asked questions I get from slab lifting customers:

## Density and Expansion

The most common slab lifting foams we sell are [AP Lift 430](https://alchemy-spetec.com/home/concrete-slab-jacking-foam-ap-lift-430/), [AP Lift 440](https://alchemy-spetec.com/home/slab-foundation-lifting-ap-lift-440/), and [AP Lift 475](https://alchemy-spetec.com/home/high-density-polyurethane-foam-ap-lift-475/). Each foam has a different density and load-bearing capacity. They also have different expansion properties. The higher the density of foam, the lower the amount of expansion (yield). All of the properties on the [datasheets](https://alchemy-spetec.com/downloads/) are based on lab conditions and free rise foam compression and density testing.  Free rise means foam that is allowed to expand in an unconfined state. When foam expands in a confined space, the densities and strengths increase rapidly.

## Technical Data for Each AP Lift Foam

**AP Lift 430 **

Expansion = 24x

Yield = 3.2 cubic ft / gallon

Density = 3 lb per cubic ft

Bearing capacity = 7000 psf

[NSF ANSI 61 Approved (Safe for potable water contact.)](https://info.alchatek.com/blog/nsf-certification-spells-peace-of-mind-for-stakeholders)

*Applications:* Void fill, Residential Slabs, Light Commercial, some DOT

 

**AP Lift 440** 

Expansion = 17.5x

Yield = 2.4 cubic ft / gallon

Density = 4 lb per cubic ft

Bearing capacity = 11000 psf

*Applications:* Commercial / Industrial Slabs, Bridge Approaches, DOT

 

**AP Lift 475** 

Expansion = 14-15x

Yield = 2.0 cubic ft / gallon

Density = 4.75 lb per cubic ft

Bearing capacity = 14000 psf

[NSF ANSI 61 Approved (Safe for potable water contact.)](https://info.alchatek.com/blog/nsf-certification-spells-peace-of-mind-for-stakeholders)

*Applications:* Industrial, Airport, Rail, DOT, Sinkhole Remediation, Infrastructure Sealing

### Want more info on Alchemy-Spetec slab lifting products & services?

[View full post](https://info.alchatek.com/blog/lifting-foam-density-and-expansion)

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