NewKem Vinyl Ester resin


Vinyl ester resins are essentially comprise a base of polyester resin strengthened with epoxy molecules in the backbone of the molecular chain.

Vinyl ester resins also use  MEKP  (Polyester Resin Catalyst) for hardening.

Vinyl ester resins can be 'thinned' by reaction with chemicals such as styrene.

These chemical differences between the resins result in several differences in physical properties.

ADVANTAGES compared to Polyester Resins

  • On a broad scale of viscosity, vinyl esters are midway between polyesters and epoxy resins, before adding styrene. Thinning affects workability and strength - 'thinning' reduced strength but makes it easier to brush or spray.
  • Vinyl esters are more tolerant of stretching than polyesters. This makes them more able to absorb impact without damage. They are also less likely to show stress cracking.
  • Vinyl ester has fewer open sites in its molecular chain. This makes it much more resistant to water penetration 
  • Vinyl esters shrink less on curing, which means that 'pre-release' of a laminate from a mold is less significant.
  • The cross bonding of vinyl esters is superior to that of polyesters. This means that vinyl esters bond to core materials much more effectively than polyesters and delamination is less of an issue.
  • Vinyl esters are less sensitive to ambient conditions (temperature and humidity) than are polyesters

Made in Australia 

Size: 1L and 4L

Catalyst to use is the NewKem MKEP Hardener

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