Common industrial practice sets personnel-protection limits at 45–60 °C for metallic surfaces with incidental contact; ASTM C1055 provides the burn-threshold methodology (5-second contact producing first-degree burn ≈ 60 °C for metals), and many corporate specs adopt 45–50 °C for accessible equipment. Inzonex covers are engineered to ≤45 °C surfaces. Note the emissivity twist: a low-emissivity bright metal jacket runs HOTTER to the touch than a fabric surface at identical heat loss — high-emissivity skins make compliance easier at equal thickness.
Compute your own case: free heat-loss calculator · materials library: 12 datasheets · related: What insulation works at 600 °C? · Can insulation touch the hot pipe directly? · What insulation is safe over stainless steel? · How long does industrial insulation last?
