The most common fiberglass resins that are used in the pultrusion manufacturing process of FRP profiles are special duroplastic resins, which contain adequate catalysts, uv-stabilizers and pigments to get a matrix, which meets the required mechanical and chemical properties.
The unsaturated Polyester resins have become the most popular resins for FRP applications during the last years. They are colorless to light yellow solutions of UP in a reactive solvent, in general styrene, which are cured under heat treatment. The reaction of UP is exothemic.[one_half]

Unsaturated polyester is resistant to:

  • aromatic hydrocarbons
  • aliphatic hydrocarbons
  • oil and petrol
  • acids
  • saline solutions
  • alcohols

Properties

Optical: opaque
Viscosity: low
Service temperature: -30 to 130°C
Vinyl ester

Vinyl ester resins are produced by conversion of epoxy with methacrylic acid. The use of vinyl ester resins for FRP profiles and gratings provides a high resistance to chemical attacks.

Vinyl ester resins are resistant to

  • aromatic hydrocarbons
  • aliphatic hydrocarbons
  • acids
  • lyes
  • alcohols
  • grease
  • oil and petrol

Vinyl ester Properties

Optical:yellow
Viscosity:low
Service temperature: -30 to 150°C
Epoxy resins are compunds, which have one or more reactive epoxy or hydroxyl groups. As a rule they originate from bisphenol A ans epichlorhydrine by a combination of polyaddition and polycondensation with a followed curing process. Epoxy resins are resistant to

  • aliphatic hydrocarbons
  • organic solvents
  • oil and petrol
  • alcohols
  • saline solutions
  • acids
  • lye

Acrylic resin

Acrylic resins are produced by ploymerisation of acrylic acid, methylic acid and the pertinent esters.
Acrylic resins are used in areas in which a high resistant to fire and a low smoke emission is requested.
and they are not so commonly used in the pultrusion process.