Vinyl Ester Over Polyester

Epoxy can be applied over polyester and vinyl ester resin for repairs etc but not vice versa vinyl ester resin.

Vinyl ester over polyester.

Vinyl esters are more tolerant of stretching than polyesters. Vinyl ester has fewer open sites in its molecular chain. Vinyl ester resin is considered a hybrid of polyester and epoxy meaning its handling characteristics properties and price generally fall just between the other two. It has a longer molecular chain than polyester.

For primary bonds the wet on wet bonding is strongest between chemically compatible resins so if you re finishing with gelcoat you have to use polyester resin or. This makes it much more resistant to water penetration hydrolysis which can cause osmotic blistering. Structural polyester resin with fiberglass layer 4. Vinyl ester can be used as the final coat after polyester resin to create a better water barrier.

For this reason epoxy resins can be applied over polyester vinyl ester resins to achieve a chemical bond but polyester vinyl ester resins can not be applied over epoxy resin. Iso polyester gelcoats 27 35 288 87. Pigment paste concentrates 9 90 51 90. Vinyl ester resins can be formulated to perform in a variety of applications requiring increased strength over polyester resins and in many.

I have always wondered why kelsall with his kss flat panel construction prefers polyester to epoxy in the face of all the evidence against polyester. Vinyl ester resin is more resistant to solvents and water degradation. It s great having someone so knowledgeable just one phone call email or. 555 vinylester glass flake barrier coat 38 50 425 00.

One of the key layers that has been introduced into fiberglass construction over the last 20 years has been the use of a corrosive resistant vinyl ester layer. Polyester resin finishing layer. Vinyl esters shrink less on curing which means that pre release of a laminate from a mold is less significant. 945 vinylester bonding compound 20 90 205 50.

It is typically used in gas tanks boat hulls and other items that will be exposed to water or chemicals for extended periods of time. It is important to note that of the three vinyl ester resin will provide the highest corrosion resistance temperature resistance and elongation toughness. For this reason vinyl ester resins and vinyl ester blended with polyester are also used extensively in the marine industry to produce an effective water resistant barrier for boat hulls and other parts. Especially when the kss panels are being bent around one way or the other.

Vinyl ester resin falls between the polyester and epoxy resin when it comes to different characteristics and cost.