Versatile phenolic resin boards


The properties of phenolic resin allow a variety of connectivity with other materials. Together with binders and fillers, it can be ideally processed to insulating panels made of hard foam. However, building regulations must be adhered to in the manufacture and use of the contained toxins.

Many fillers and supplements possible

The versatile processing capability and combination with other materials can result in a highly effective insulation board. Typical fillers and supplements are:

  • cellulose
  • cotton
  • Grated rock
  • Sawdust and wood flour
  • magnesia
  • fabrics woven
  • tissue networks
  • paper
  • cardboard

The production of phenolic foam is a combination of "mixing" and pressing. In general, the fillers and supplements are soaked and post-pressed. This produces foam boards with very good insulation values.

Foams and laminations

The addition of foaming aggregates produces different consistencies and plate properties. Typical blowing agents in phenolic resin boards are:

  • pentane
  • chloropropane
  • isobutane

In order to achieve additional functional effects, the phenolic resin panels are built up by lamination into composite insulation materials. Depending on the place of use and the purpose of use, "typical" insulating additives such as mineral, stone and glass wool can also be integrated.

Good insulation values ​​even with low material thickness

Phenolic resin boards are cured by appropriate manufacturing processes and after setting, all Ausdünstungswerte by the toxic ingredients below structural limits. When installing indoors, the phenolic resin panels must be approved by the manufacturer for the type of use.

One of the great advantages of phenolic resin boards is the high insulation effect even at relatively low material thickness. Therefore, they are particularly suitable for limited space or as subsequently applied insulation. When processing, however, it should be noted that when sawing, cutting and smoothing harmful dust and toxic dirt particles arise.

Common types of installation and use

The classic locations for phenolic resin panels are found in ventilated parts of buildings. In non-permanently inhabited interiors, approved and suitable panels can also be used as ceiling insulation.

  • Insulation on rafters
  • Insulation under rafters
  • Flat roof insulation
  • Facade insulation outside
  • Basement ceiling insulation

As Zwischenparens insulation are phenolic resin plates less suitable than, for example, the same type of panels made of polyurethane. In this application, the brittleness of the phenolic resin proves to be more expensive.

In combination with other insulating materials, phenolic resin panels are often used as cut-to-size mounting hardware for windows, doors, roller shutter boxes and other structural parts to prevent any formation of heat or cold bridges.

Safety and fire resistance

Phenolic resin panels comply with all fire regulations for building insulations and are classified in the European building material class E. If a fire occurs, the phenolic foam is flame retardant. Even if it should develop flames in a long-lasting and persistent fire, the material drips fire-prevent and develops little smoke.

The brittle phenolic sheets are provided with a medium compressive strength which increases or decreases according to the composites. If the insulation board or the hard foam is not subjected to pressure and is protected from the effects of the weather, phenolic foam has a virtually unlimited service life.

Tips & Tricks

Phenolic resin boards are not entirely uncontroversial, since the escape of harmful substances can not be ruled out even in dry and set conditions. To be on the safe side, use the insulation only outdoors.


Video Board: Production of Phenolic Resins (Phenol Formaldehyde Resin, Resin Production)