Anti-corrosion grades and insulation performance?

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Short answer Standard containers carry C4 industrial-grade corrosion resistance, with C5 marine-grade available as an option. Inner walls are lined with high-density polyurethane foam, giving both flame retardancy and strong thermal insulation. C4 corrosion grade standard C5 marine grade optional High-density polyurethane insulation Flame-retardant lining Corrosion and insulation specification PropertyStandardOption Corrosion resistanceC4 industrial gradeC5 marine grade Wall insulationHigh-density polyurethane foam lining— Fire performanceFlame-retardant lining— Why these two specs matter outdoors Container shells and insulation live in the weather all year. C4 covers industrial atmospheres. The standard grade is specified for industrial exposure. C5 for coastal and marine sites. Choose the higher grade where salt-laden air is a factor. Polyurethane does double duty. It insulates the interior thermally and is flame retardant. Long-term outdoor exposure is the design case. Coastal or inland — the grade is chosen per site. Pick the grade by site, not by habit C4 is the standard for a reason — but not for every site. Coastal, offshore-adjacent and heavy-industry locations should be specified as C5 marine grade at ordering. Related questions Custom branding and CSC shipping certification? How does the SR40 V3 perform in extreme ambient temperatures? How to prevent interference and simplify maintenance? Matching the enclosure spec to your site? Talk to a CoolSpace engineer

Anti-corrosion grades and insulation performance?

Short answer

Corrosion and insulation specification

Why these two specs matter outdoors

Pick the grade by site, not by habit

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Property	Standard	Option
Corrosion resistance	C4 industrial grade	C5 marine grade
Wall insulation	High-density polyurethane foam lining	—
Fire performance	Flame-retardant lining	—