are chiefly dangerous by external contact with the body or by their being taken internally, as in contaminated foods or feeds. The vapors of some of this class of materials are also offensive or dangerous, but to a much less extent than class A poisons. Any poisonous material not described in rule 7.70011 which has a toxicity greater than 22 milligrams per kilo body would fall within this group. 7.70013 CLASS C, TEAR GASES OR IRRITATING SUBSTANCES, TEAR GAS LABEL.— Tear gases are liquid or solid substances which upon contact with fire or when exposed to air give off dangerous or intensely irritating fumes, such as brombenzylcyanide, chloracetophenone, diphenylaminechlorarsine, and diphenylchloarsine, but not including any poisonous article, class A. 7.7077 ARSENICAL COMPOUNDS IN BULK.-Care shall be exercised in the loading and unloading of “arsenical dust,” “arsenic trioxide," and "sodium arsenate” arsenical compounds, such as lead arsenate, ealcium arsenate or arsenical mixtures or dusts, allowable to be loaded into sift-proof, steel hopper-type or dumptype motor-vehicle bodies equipped with water-proof, dust-proof covers well secured in place on all openings to accomplish such loading with the minimum spread of such compounds into the atmosphere by all means that are practicable; and no such loading or unloading shall be done near or adjacent to any place where there are or are likely to be, during the loading or unloading process, lor assemblages of persons other than those engaged in the loading or unloading process, or upon any public highway or in any public place. 7.713 ACCIDENTS.-In the event of an accident involving any motor vehicle transporting any poison which is inflammable, noxious, or toxic, every available means shall be employed to prevent individuals other than those employed in the protection of persons or property or in the removal of hazards or wreckage, from congregating in the vicinity; such means shall also be employed to prevent smoking, to keep flame away, to safeguard against the aggravation of the hazard present, and to warn other users of the highway. Care shall also be taken to prevent any poison, whether inflammable or noninflammable, from contaminating streams or flowing or being spilled into sewers. (See also rule 7.113.) 7.3-S-1.0 SCOPE.-This specification is primarily designed to apply to tank motor vehicles and Type A cargo tanks (including tank containers) to be used for the transportation of inflammable liquids as defined in rule 7.3001 of section 7.3 of these regulations, and, though not mandatory for tanks or for motor vehicles for the transportation of liquids having flash points above eighty degrees Fahrenheit (80° F.), it is recommended that such liquids be transported in tanks and on tank motor vehicles having characteristics equal or superior to the requirements herein set forth. This specification as a whole is divided into several parts thus: Specification 7.3-S-1.1 for tank motor vehicles. Specification 7.3-S-1.2 for Type A cargo tanks constructed of mild (open hearth or blue annealed) steel. Specification 7.3-S-1.3 for Type A cargo tanks constructed of welded aluminum alloy (grade 3S). Specification 7.3-S-1.4 for Type A cargo tanks constructed of welded aluminum alloy (grade 528). Specification 7.3-S-1.5 for Type A cargo tanks constructed of welded ferrous alloy (high-tensile steel). Specification 7.3-S-1.6 for type A B cargo tanks. constructed of welded austenitic stainless steel. REVISED TABLE 7.1-2.-Alphabetical list of explosives and other dangerous articles |