What Von Duprin 98/99 device finish is preferred for harsh caustic chemical damage in exterior conditions?

What Von Duprin 98/99 device finish is preferred for harsh caustic chemical damage in exterior conditions?  We recommend any of our "powder coat" finishes for these conditions (US28, 313, and 315).  We also offer several available powdercoat colors from Tiger Drylac powder company.  

See the Von Duprin price book for special finish options.

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