What is GRP

GRP production

GRP materials consist of a combination of polyester resin and fibreglass. The resin hardens the product and makes the product resistant to chemicals, weather, UV and marine conditions. The fibreglass creates mechanical strength. Polem uses a range of different resins including:

  • Orthophtalic
  • Isophtalic
  • Vinylester
  • Epoxy-novola

The selection of a specific resin depends on the particular application (product and temperature). Where necessary, ECR glass fibre is used in addition to E-glassfibre in order to create higher chemical resistance.

Polem manufactures using  the spray winding process. Resin and glass fibres are sprayed onto a steel mould. Polem silos and tanks are finished using a coloured or semi-transparent top coat. This top coat is double-stabilised against UV light and provides optimal protection against any kind of weather. The inside of the silos and tanks are smooth and seamless, giving excellent flow characteristics and easy clean ability. The silos and tanks can be supplied in a single piece with a diameter ranging from 800 – 9.000 mm, and with a volume ranging from 1 m3 – 1.500 m3. The production facilities are capable of producing seamless cylindrical components of up to 30 m in length.

Material Properties

In comparison to metal, alloys or rubber lined steel products, Glassfibre reinforced plastic products (GRP) have many advantages. GRP is very light-weight, very strong and can be produced in a wide range of shapes, which has a direct impact in terms of extending the installation’s lifespan and cost savings. In addition, GRP is a durable choice of materials compared to traditional materials, which means that GRP delivers significant benefits in terms of resistance to abrasion, chemical corrosion, rust, as well as resistance to extreme low and extreme high temperatures. This makes it a long lasting solution for clients with low maintenance and lifecycle costs.