![[Header] PHMSA - U.S. Department of Transportation - Pipeline and Hazardous materials Safety Adminis](/staticfiles/PHMSA/SiteHeaders/Images/PHMSASiteHeader.gif)
| HM-110 | Repair and Maintenance of Vehicles; Highway | Aug 27, 1973 |
| HM-111 | Miscellaneous Amendments - RAM | Oct 25, 1973 |
| HM-112 | Consolidation of HM | Jan 24, 1974 |
| HM-113 | MC330/331 Cargo Tank Stress Corrosion Cracking | Jan 4, 1974 |
| HM-114 | Rail Cars used to transport Class A Explosives | Feb 6, 1974 |
| HM-115 | Cryogenic Liquids | Mar 8, 1979 |
| HM-116 | Classification of New Explosives and Shipment of Samples of explosives | Apr 4, 1974 |
| HM-117 | Specification IM Glass Carboy in Polystyrene Packaging and cancellation of certain obsolete specification packagings | Jun 14, 1974 |
| HM-118 | Expandable Polystyrene Resin and the definition of a flammable solid | Aug 9, 1974 |
| HM-119 | Polyethylene Drum | Jul 31, 1974 |
| HM-120 | Switching of Freight Cars | Aug 14, 1974 |
| HM-121 | I-Bars on Steel Drums | Oct 22, 1974 |
| HM-122 | Applicability of Regulations to Private & Contract Carriers by Motor Vehicle | Dec 4, 1974 |
| HM-123 | Shippers - Rail Freight | Dec 12, 1974 |
| HM-124 | Bottom Outlets - MC 312 Cargo Tanks | Mar 26, 1975 |
| HM-125 | Prohibit Construction of 112A/114A Tank Cars | Mar 26, 1975 |
| HM-126A | Identification Numbers Correction | Jun 7, 1979 |
| HM-126B | Improved Descriptions of HM for Emergency Response | Nov 8, 1979 |
| HM-126C | Emergency Response Communication Standards | Mar 16, 1984 |
| HM-126D | Odorization of LPG/ Miscellaneous Proposals | Sep 27, 1984 |
| HM-126E | Odorization of LPG | Sep 27, 1984 |
| HM-126F | Training for HM Transportation | Jul 26, 1989 |
| HM-126G | Emergency Response Communication-Excepts | Jul 26, 1989 |
| HM-128 | Carriage of HM aboard Aircraft | Oct 1, 1975 |
| HM-129 | Portable Tank Marking | Nov 7, 1975 |
| HM-130 | Portable Tank - Gross Weight | Jun 9, 1975 |
| HM-131 | Inspection & Monitoring RAM | Dec 11, 1975 |
| HM-132 | Asphalts in Cargo Tanks | Dec 29, 1975 |
| HM-133 | Definition of Flammable & Combustible Liquids | Dec 31, 1975 |
| HM-134 | HM Reissuance | Jan 13, 1977 |
| HM-135 | Certification of Cargo Tanks and Placarding of Motor Vehicles | Apr 28, 1976 |
| HM-136 | Location of Manholes & Certification Plate - Cargo Tanks | Apr 30, 1976 |
| HM-137 | Gallium Metal | Sep 2, 1976 |
| HM-138 | Preemption & Enforcement Procedures | Sep 9, 1976 |
| HM-138A | Enforcement Procedures | Sep 24, 1981 |
| HM-138B | Settlements & Compromises of Civil Penalty & Comp. Orders | May 30, 1989 |
| HM-139 | Conversion of Exemptions | Sep 13, 1976 |
| HM-139A | Conversion of Exemptions | Dec 18, 1978 |
| HM-139B | Conversion of Exemptions | Jun 25, 1979 |
| HM-139C | Conversion of Exemptions | Mar 24, 1980 |
| HM-139D | Conversion of Exemptions | Jun 4, 1981 |
| HM-139E | Conversion of Exemptions | Jul 1, 1982 |
| HM-139F | Conversion of Exemptions | Aug 8, 1983 |
| HM-139G | Conversion of Exemptions | Aug 28, 1984 |
| HM-139H | Air Bag Inflators & Modules for Passive Restraint Systems | Feb 26, 1990 |