Always be concerned about metallurgical compatibility. Incompatibility can cause rapid galvanic corrosion and void material warranties. S-5! aluminum clamps are completely compatible with painted or unpainted G-90 galvanized steel, bare or painted Aluminized , Galvalume, Zincalume, ZincalumePlus, Acrylume Galvalume Plus, Galfan and Galvanneal steel. Of course, they are also compatible with aluminum (painted, bare or anodized). They are also compatible with titanium-zinc (VM & Rheinzink). They are also compatible with stainless steel. The brass clamp is compatible with everything the aluminum clamp isn’t.
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