Metal Finishing Guide Book


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finishing industry because of their low absorption, high chemical resistance, and outstanding resistance to impact. They do not possess the rigidity and flexural capabilities of PVC or PP and, consequently, the fabrications are significantly smaller. A new generation of PE is making significant inroads into the finishing industry. Crosslinkable, high-density PE for rotational molding is being used for tanks of 5-10,000-gal capacity. These new resins exhibit excellent physical properties and good resistance to weathering. Applications for the most part have been indoor and outdoor storage tanks and portable receiver tanks. Fiberglass-reinforced plastics have been successfully used for a multitude of applications for many years. The earliest fabrications utilized furan and phenolic resin binder systems. The more popular resin binder systems in use today are polyester, epoxy, and vinyl ester. The success of FRP structures is substantially predicated on the proper choice of resin and hardener system most inert to the environment to which the fabrication will be subjected. It is not enough to request an FRP tank, any more than it is to request a flake-glass-reinforced polyester tank. It is important to either provide the fabricator with all chemical, thermal, and physical information pertinent to the process in order that the proper resin and hardener system might be selected, or to have in-house technical competency capable of making the proper selection of the resin-hardener system from which the manufacturer can fabricate the desired equipment. There are numerous polyester resins available; however, for aggressive corrosion environments, such as high concentrations of alkalies and a broad range of acids, the bisphenol-A fumarate resin is the best recommendation. Vinyl esters are epoxy-resin-based, thermosetting resins that provide chemical resistance similar to that of bisphenol A polyesters. They are considered to be slightly better in high concentrations of alkaline hypochlorites than New Life for Old Tanks the bisphenol A polyester. Vinyl Long Life for New Tanks esters exhibit outstanding physical properties, i.e., tensile, flexural, and CHOOSE FLEXI-LINER TM elongation that are normally associSince ated with epoxies. • The original flexible tank liner 1953 • Installed worldwide The chemical resistance and • Custom fabricated to ensure fit physical properties of epoxy res• Advanced & proven material formulations ins are functions of the resins, but • Resistant to a wide range of chemicals equally important, they are very • Always responsive to emergencies much functions of the curing sysFlexible • Corrosion-resistant tems employed. Easy to install Aliphatic and aromatic amine curing systems impart better Call today chemical resistance to epoxy resins 800-423-4909 than do polyamide curing agents. Polyamides, however, impart better "Trusted by Fortune 500 and owner-operators alike" impact resistance to epoxies than do aliphatic or aromatic curing sys3198 Factory Drive FLEXI-LINER Pomona, CA 91768 tems. 800-356-4648 The intention of these three Email: examples of the resin systems utilized for constructing [ ] 767

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