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GRP - glass fiber reinforced polyester

and our expertise

from 60 years of experience

As one of the first companies in Europe, WOLFA has been producing, processing and handling glass fiber reinforced polyester since 1955.
The particular characteristics of this plastic material, our 60 years of experience and our expertise in producing and processing GRP guarantee unique and unmatched products for a great variety of applications. 

Material and characteristics

WOLFA products are made from glass fiber reinforced polyester (GRP) and compression-molded (SMC) into the final product.

  • SMC is a thermosetting plastic material, i.e. no plastomer such as polypropylene (PP) or PVC.
  • It is permanently resistant to weather and heat-proof up to 100° C, short-term even up to 200° C; the material is inherently stable and can be used under hot asphalt. SMC is resistant to cold and does not become brittle; it is UV-proof and resistant to wear and tear.
  • Another major advantage is its resistance to petrol, liquid manure and many chemicals.

Thanks to its excellent material characteristics, SMC today also plays an important part in the automobile and aerospace industry.


We produce the material and manufacture our building elements in our own shop - from one source, under one roof.

Thermosetting plastic SMC (Sheet Molding Compound) is a mix of unsaturated polyester resins (UP), textile glass fibers, filling material and various additives.
The raw material (prepreg) is also produced by WOLFA.
Our sophisticated formulas, state-of-the-art process technologies and techniques guarantee unmatched raw material quality.
Produced as continuous webs and left to set for several days, it is then processed as needed for each individual window well type and molded into the finished product.

Our toolshop

The up to 30-ton compression molds are designed, developed and produced in the WOLFA toolshop. Technological state-of-the-art production techniques, official certificates and approvals, and decades of practical experience and know-how gained from millions of WOLFA products add life to each new mold.

The result

The result is a vast portfolio that provides the perfect solution for every building project and situation.


WOLFA - MADE IN GERMANY - Kunststoff-Bauelemente
The great advantage compared to conventional window wells: the large-sized glass fibers and high amount of SMC material warrant maximum stability which, in turn, enables the production of larger than usual window wells
Der große Vorteil gegenüber herkömmlichen Lichtschächten aus Polypropylen:
Glass fiber integration into the raw material
Große Glasfasern und der hohe Anteil im SMC-Material stehen für höchste Stabilität und ermöglichen somit auch die Herstellung von Großlichtschächten.
SMC raw material (also called prepreg) production line
Einbringung der Glasfasern in das Rohmaterial.
WOLFA production lines for pressed GRP components
WOLFA-Fertigungslinien für GFK-Pressteile.
Compression mold for large window wells
Presse für Großlichtschächte.
The tools are designed and built by qualified expert personnel in our own toolshop
Die Werkzeuge werden im eigenen Werkzeugbau durch qualifiziertes Fachpersonal selbst gebaut.