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Resin Comparison

  • Thursday, 24th January 2019
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  • Reading time: less than a minute

The polyesters, vinylesters and epoxies discussed here probably account for some 90% of all thermosetting resin systems used in structural composites. In summary the main advantages and disadvantages of each of these types are:

Polyesters

Advantages:

  • Easy to use 
  • Lowest cost of resins available (£1-2/kg)

Disadvantages

  • Only moderate mechanical properties 
  • High styrene emissions in open moulds 
  • High cure shrinkage Limited range of working times

Vinylesters

Advantages:

  • Very high chemical/environmental resistance 
  • Higher mechanical properties than polyesters

Disadvantages

  • Postcure generally required for high properties 
  • High styrene content 
  • Higher cost than polyesters (£2-4/kg) 
  • High cure shrinkage

Epoxies

Advantages

  • High mechanical and thermal properties 
  • High water resistance 
  • Long working times available 
  • Temperature resistance can be up to 140°C wet / 220°C dry 
  • Low cure shrinkage

Disadvantages:

  • More expensive than vinylesters (£3-15/kg) 
  • Critical mixing 
  • Corrosive handling

Published courtesy of David Cripps, Gurit

http://www.gurit.com


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