Vinyl Ester Vs Polyester Strength

In the case where a part originally manufactured utilizing polyester or vinylester has yielded to strain and cracked a well reinforced epoxy repair will tenaciously hold to the substrate with 2000 psi strength vinylester.

Vinyl ester vs polyester strength.

Choosing the appropriate resin epoxy vs. Epoxy resin should be used. Ortho polyester isothalic polyester and vinylester resins are compatible they all have styrene commonly known as the fiberglass smell and chemically bond to one another. Many high strain repair areas and lightweight parts must flex and strain without micro fracturing.

The styrene in the polyester or vinyl ester resin will melt it. Vinyl ester resins are produced by the reaction esterification between an epoxy resin and an unsaturated monocarboxylic acid. Standard pool failures with polyester resin standard fiberglass pool manufacturers only use vinyl ester resin in one layer of the swimming pool as vinyl ester resin. So does most room temperature epoxy and many vinylesters.

So in tension the glass is only loaded to about 17 of its strength. When using vinyl ester resin be sure to use it quickly after purchasing. Why epoxy is preferable to vinylester and both are preferable to polyester. Vinyl ester has a shelf life of 3 months.

There are many good reasons to use epoxy instead of polyester. Vinyl ester resin is a high performance resin that provides improved strength properties and inhibits water penetration into the laminate a process commonly referred to as osmosis. If strength is part of the reason why you are purchasing this product avoid polyester resins for carbon fiber and kevlar bonding. Vinyl esters also use peroxides e g.

Glass fabric has about 6 stretch to failure. Essentially they comprise a base of polyester resin strengthened with epoxy molecules in the backbone of the molecular chain. When higher strength bond and water resistance is required such as keel rudder repair or out board transom replacement use lbi s 302 isothalic polyester resin. Vinylester the vinylester resins are only about 1 3rd as strong as the epoxy.

While vinyl ester resins are classified as polyester based formulations they are actually an intermediate between a polyester backbone and epoxy terminations on the ends of the molecules. Vinyl ester resins offer increased strength corrosion resistance and durability and are used in a wide variety of applications. Resin has a short shelf life. Polyester stretch to failure is everyone.