NetComposites
Thermwood

Resin Comparison

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