Hydra-Zorb Cushion Clamps are available in electro galvanized mild steel, yellow trivalent plated mild steel, 304 & 316 stainless steel, and aluminum.
Klo-Shure 7-Series is sized to fit with elastomeric insulation, and 9-Series is sized for fiberglass insulation.
Yes, Klo-Shure Insulation Couplings are rated under UL Standard 2043, 2nd Edition: “Fire Test for Heat and Visible Smoke Release for Discrete Products and Their Accessories Installed in Air-Handling Spaces.”