02 July 2004
02 July 2004
RL Industries are using Vipel corrosion-resistant resin technology and service from AOC to support the growing worldwide demand for personal computers.
RL Industries’ connection to the computer industry includes their expertise in special dual-laminate tank construction. For a recent expansion, a major U.S. semiconductor manufacturer needed seven dual-laminate tanks. Two tanks are for storing high purity sulfuric acid, which is used in a variety of semiconductor manufacturing processes. Five are used to process a semiconductor industry waste stream containing concentrated heavy metals and hydrofluoric acid.
The sulfuric acid storage tanks are 10 feet high by 5 feet in diameter and have a capacity of 1,500 gallons. These tanks are fabricated with a 3 mm liner of fabric-backed polyvinylidene fluoride (PVDF), a thermoplastic fluoropolymer engineered to resist highly acidic environments. The five tanks for storing the heavy metal-hydrofluoric acid solution are lined with polypropylene.
For all vessels, the structural laminate that supports the liner is made of E-glass fibres in a resin matrix of Vipel F010 bisphenol A epoxy vinyl ester. RL Industries’ craftsmen use spray-up to produce the tank shell and hand lay-up to produce the tank tops, bottoms and nozzle flanges.
“In addition to providing the required physical properties, the Vipel resin processes well in both the spray-up and hand lay-up processes,” comments Brian Linnemann, Engineering Manager, RL Industries. “The resin has good wetting characteristics for all the laminate reinforcements as well as a carbon veil that backs the thermoplastic to meet requirements for high-voltage spark testing.” The E-glass reinforcements for the applications are 458 and 229 gram chopped strand mat, woven roving and gun roving.