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179.220-4 Insulation. RegSenseGeneral Packaging Requirements - HazmatPipeline and Hazardous Materials Safety Administration (PHMSA), DOTCFR RegulationsHazmat SafetyFocus AreaCFR SectionGeneral Packaging Requirements - HazmatEnglishTransportationUSA
The annular space between the inner container and the outer shell must contain an approved insulation material.[Amdt. 179–9, 36 FR 21340, Nov. 6, 1971]['General Packaging Requirements - Hazmat']['General Packaging Requirements - Hazmat']