{"operation":"document","citation":"49 CFR 179.220-4","title":"-4 Insulation.","source_type":"regulation","agency":"Pipeline and Hazardous Materials Safety Administration","status":"current","official":true,"published_on":null,"effective_on":"2026-08-18","summary":"The annular space between the inner container and the outer shell must contain an approved insulation material.\n\n[Amdt. 179-9, 36 FR 21340, Nov. 6, 1971]","machine_formats":{"json":"https://regulus.evalyn.ai/document/49-cfr-179-220-4.json","markdown":"https://regulus.evalyn.ai/document/49-cfr-179-220-4.md"},"app_url":"https://regulus.evalyn.ai/document/49-cfr-179-220-4","source_url":"https://www.ecfr.gov/on/2026-08-18/title-49/section-179.220-4","body":"The annular space between the inner container and the outer shell must contain an approved insulation material.\n\n[Amdt. 179-9, 36 FR 21340, Nov. 6, 1971]","truncated":false,"body_characters":153}