Interaction with other construction materials

Where can I find PU foam that works at temperatures of - 25°C?

The winter foams sold in Germany can usually be used up to -10°C. PU foams that work at lower temperatures are sold in other countries that have much longer and colder winters. You should ask the manufacturers. There is a  list of leading manufacturers of PU foam by PDR.

Does PU foam corrode other materials, for instance cable jackets?

No. PU foam does not corrode other materials, for instance cable jackets.

Can plaster be simply applied over PU foam?

It is usually very easy to paint or plaster over PU foam. It is usually compatible with the common pants, lacquers and plasters.

Does PU foam interact with other construction materials?

No, because hardened PU foam is environmentally neutral.

Is PU foam sensitive to moisture?

“Local PU foam usually has closed cells. Water absorption lies below 1 Vol.-%. There are corresponding test certificates (see Annex 1). Local PU foam is resistant to moisture.”

This is stated in an expertise by the ift Rosenheim (page 9). You will find the expertise here:

Expertise by the ift Rosenheim

Can the joints in pumice walls be sealed with PU foam?

In this case we do not recommend using a classic PU foam because pumice absorbs too much moisture and this could prevent the PU foam from hardening.

What can I use to cover/coat PU foam indoors?

PU foam is compatible with all common paints, lacquers and plasters. Simply use a sharp knife to cut away any excess PU foam to create a smooth surface.

On what surfaces does PU foam adhere to, and on which does it not adhere?

Construction foam adheres well to the following materials: concrete, plaster, bricks, fibre cement and wood, if the surface is dry and free of dust. It adheres well to aluminium, pretreated metals and numerous plastics.

PU form does not adhere to the following surfaces:

  • on untreated gypsum and other dusty surfaces
  • on Teflon, silicon, PE and PP plastics, and surfaces with separating agents, e.g. oil
  • On polished, non-absorbent surfaces

Questions and answers about PU foam

Working with PU foam

Ecology and recycling

Special application areas

Questions about the product

Sources of error

Active ingredients and health