Vinyl Ester Over Epoxy

In areas that must be able to flex and strain with the fibers without micro fracturing epoxy resins offer much greater capability.

Vinyl ester over epoxy.

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. Epoxy vinyl ester resins ver are an important class of high performance thermoset molding resins. Many high strain repair areas and lightweight parts must flex and strain without micro fracturing. Cured epoxy tends to be very resistant to moisture absorption.

Quality epoxy resins stick to other materials with 2 000 p s i. To cover wood a laminate using epoxy resin and 10 oz cloth will yield a much better job than 10 oz. Specifically proper cure of vinyl ester resins and a 15 year study of the effective use of permeation barriers in marine composites to prevent corrosion and blistering. Before coating a fully cured layer of epoxy with polyester gelcoat prepare the surface properly to remove any amine blush.

Regarding costs vinyl ester resin is more expensive than polyester resin but cheaper than epoxy resin. The two main types of epoxy resins are bisphenol a diglycidyl ether dgeba and epoxy phenol novolac epn. Epoxy adheres to wood much better than polyester does. The hardener catalyst for vinyl ester resin and polyester resins is mekp.

Allow the epoxy to cure to the point where sanding produces a fine powder. Has some great papers on this which i am quoting from. Essentially they comprise a base of polyester resin strengthened with epoxy molecules in the backbone of the molecular chain. They are produced by the addition of α β unsaturated carboxylic acids to epoxy resins.

It is water resistant. Wash away amine blush with water and an abrasive pad such as a 3m 7447 hand pad. It adds excellent strength rigidity adhesion water and chemical resistance. Epoxy resin is an ideal resin for high performance and light weight parts.

Before applying gelcoat over epoxy. Vinylester is essentially a styrene modified epoxy resin. For vinylester resins and even less for polyesters. Vinyl esters also use peroxides e g.