To assist in selecting Nil-Cor valve materials, Nil-Cor publishes a detailed corrosion guide. Information in the guide is compiled from several sources -

Nil-Cor Immersion Testing Resin Tests by Dow (Derakane® Vinyl Ester) and Phillips (Ryton® PPS) Nil-Cor Application Database

CORROSION GUIDE SUPPLIMENT FOR NEW AND IMPROVED 500XP AND 610XP SERIES

Corrosion information is presented by concentration and allowable maximum temperature. For immediate assistance, view our Quick Reference Corrosion Guide on-line. Other variables can affect the suitability of a particular resin for a particular service, such as the presence of solids or extreme velocity. We recommend consulting with a Nil-Cor factory sales engineer for application assistance before making your final selection.

External Corrosion:

Hostile external environments can destroy a valve just as surely as a corrosive media. Metal valves often fail due to corrosion of the stem at the packing box, resulting in freezing of the valve. Other modes of failure include body, bolting or handle rust-through. The following photos illustrate the advantages of Nil-Cor's composite body and Hastelloy packing gland, which are virtually invincible to corrosive environments. (P.S.: We're so sure of this that if any Nil-Cor valve ever fails from external corrosion, we'll replace it free of charge, regardless of its age!)

Metal Valves: Destroyed by the environment
	Nil-Cor Valve: Untouched by corrosion

Ultra Violet Exposure:

Nil-Cor thermoset and thermoplastic composites are virtually unaffected by exposure to sun light and UV radiation. This is in marked contrast to PVC and other plastic valves that degrade and fail after relatively short exposures. So for the long term, Nil-Cor valves are frequently less expensive to own and operate than plastic "throwaway" valves.