Mercaptans, liquid, flammable, toxic, n.o.s. or Mercaptan mixtures, liquid, flammable, toxic, n.o.s.
In organic chemistry, a thiol (; from Ancient Greek θεῖον (theion) 'sulfur') or thiol derivative is any organosulfur compound of the form R−SH, where R represents an alkyl or other organic substituent. The −SH functional group itself is referred to as either a thiol group or a sulfhydryl group, or a sulfanyl group. Thiols are the sulfur analogue of alcohols (that is, sulfur takes the place of oxygen in the hydroxyl (−OH) group of an alcohol), and the word is a blend of "thio-" with "alcohol". Many thiols have strong odors resembling that of garlic, cabbage or rotten eggs Wikipedia
Hazardous Materials Table
Source:
49 CFR §172 (15 June 2026)
(3) Hazard class 3
Flammable liquids |
UN 1228 |
II |
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×Note:Special provisions may be very complex. The extracts are taken from 49 CFR §172.102. Please be careful with the information, as necessary, additional conditions may be applied that are not written here. Please check the original source and report bugs. | IB2 | <sub>Authorized IBCs:</sub> Metal (31A, 31B and 31N); Rigid plastics (31H1 and 31H2); Composite (31HZ1).<br><sub>Additional Requirement:</sub> Only liquids with a vapor pressure less than or equal to 110 kPa at 50 °C (1.1 bar at 122 °F), or 130 kPa at 55 °C (1.3 bar at 131 °F) are authorized. Browse special provision IB2 |
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| T11 | <table class="table table-bordered table-condensed ushmr-sp-table"><tr><th>Minimum test pressure (bar)</th><td>6</td></tr><tr><th>Minimum shell thickness</th><td>§ 178.274(d)(2)</td></tr><tr><th>Pressure-relief requirements</th><td>Normal</td></tr><tr><th>Bottom opening requirements</th><td>§ 178.275(d)(3)</td></tr></table> Browse special provision T11 |
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| TP2 | a. The maximum degree of filling must not exceed the degree of filling determined by the following:<br>  <br>Where: <br>t<sub>r</sub> is the maximum mean bulk temperature during transport, <br>t<sub>f</sub> is the temperature in degrees celsius of the liquid during filling, and <br>α is the mean coefficient of cubical expansion of the liquid between the mean temperature of the liquid during filling (t<sub>f</sub>) and the maximum mean bulk temperature during transportation (t<sub>r</sub>) both in degrees celsius. <br>b. For liquids transported under ambient conditions α may be calculated using the formula:<br>  <br>Where: <br>d<sub>15</sub> and d<sub>50</sub> are the densities (in units of mass per unit volume) of the liquid at 15 °C (59 °F) and 50 °C (122 °F), respectively. Browse special provision TP2 |
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| TP27 | A portable tank having a minimum test pressure of 4 bar (400 kPa) may be used provided the calculated test pressure is 4 bar or less based on the MAWP of the hazardous material, as defined in § 178.275 of this subchapter, where the test pressure is 1.5 times the MAWP. Browse special provision TP27 |
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| (9A) Passenger aircraft/rail | Forbidden |
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| (9B) Cargo aircraft only | 60 L |
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| (10A) Location | B Stowage category “B” means - (i) The material may be stowed “on deck” or “under deck” on a cargo vessel and on a passenger vessel carrying a number of passengers limited to not more than the larger of 25 passengers, or one passenger per each 3 m of overall vessel length; and
- (ii) “On deck only” on passenger vessels in which the number of passengers specified in paragraph (k)(2)(i) of this section is exceeded.
Source: 49 CFR §172.101(k) |
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| (10B) Other | |
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(3) Hazard class 3
Flammable liquids |
UN 1228 |
III |
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×Note:Special provisions may be very complex. The extracts are taken from 49 CFR §172.102. Please be careful with the information, as necessary, additional conditions may be applied that are not written here. Please check the original source and report bugs. | B1 | If the material has a flash point at or above 38 °C (100 °F) and below 93 °C (200 °F), then the bulk packaging requirements of § 173.241 of this subchapter are applicable. If the material has a flash point of less than 38 °C (100 °F), then the bulk packaging requirements of § 173.242 of this subchapter are applicable. Browse special provision B1 |
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| IB3 | <sub>Authorized IBCs:</sub> Metal (31A, 31B and 31N); Rigid plastics (31H1 and 31H2); Composite (31HZ1 and 31HA2, 31HB2, 31HN2, 31HD2 and 31HH2).<br><sub>Additional Requirement:</sub> Only liquids with a vapor pressure less than or equal to 110 kPa at 50 °C (1.1 bar at 122 °F), or 130 kPa at 55 °C (1.3 bar at 131 °F) are authorized, except for UN2672 (also see special provision IP8 in Table 2 for UN2672). Browse special provision IB3 |
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| T7 | <table class="table table-bordered table-condensed ushmr-sp-table"><tr><th>Minimum test pressure (bar)</th><td>4</td></tr><tr><th>Minimum shell thickness</th><td>§ 178.274(d)(2)</td></tr><tr><th>Pressure-relief requirements</th><td>Normal</td></tr><tr><th>Bottom opening requirements</th><td>§ 178.275(d)(3)</td></tr></table> Browse special provision T7 |
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| TP1 | The maximum degree of filling must not exceed the degree of filling determined by the following:<br>  <br>Where: <br>t<sub>r</sub> is the maximum mean bulk temperature during transport, and t<sub>f</sub> is the temperature in degrees celsius of the liquid during filling. Browse special provision TP1 |
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| TP28 | A portable tank having a minimum test pressure of 2.65 bar (265 kPa) may be used provided the calculated test pressure is 2.65 bar or less based on the MAWP of the hazardous material, as defined in § 178.275 of this subchapter, where the test pressure is 1.5 times the MAWP. Browse special provision TP28 |
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| (9A) Passenger aircraft/rail | 5 L |
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| (9B) Cargo aircraft only | 220 L |
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| (10A) Location | A Stowage category “A” means the material may be stowed “on deck” or “under deck” on a cargo vessel or on a passenger vessel. Source: 49 CFR §172.101(k) |
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| (10B) Other | |
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Packing group comparison
Multiple packing groups apply to this entry. See assignment criteria in 49 CFR §173 Subpart D. Details are in the tabs above; differences are highlighted.
| PG II | PG III |
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| 1 | | |
| 2 | Mercaptans, liquid, flammable, toxic, n.o.s. or Mercaptan mixtures, liquid, flammable, toxic, n.o.s. | Mercaptans, liquid, flammable, toxic, n.o.s. or Mercaptan mixtures, liquid, flammable, toxic, n.o.s. |
| 3 | 3 | 3 |
| 4 | UN 1228 | UN 1228 |
| 5 | II | III |
| 6 | 3, 6.1 | 3, 6.1 |
| 7 | IB2, T11, TP2, TP27 | B1, IB3, T7, TP1, TP28 |
| 8A | 150 | 150 |
| 8B | 202 | 203 |
| 8C | 243 | 242 |
| 9A | Forbidden | 5 L |
| 9B | 60 L | 220 L |
| 10A | B | A |
| 10B | 40, 95, 102 | 40, 95, 102 |
Segregation chart for load, transport, and storage
This chart shows whether loading, transport, or storage with other hazard classes is permitted, prohibited, or restricted. Based on 49 CFR §177.848.
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Must not be loaded, transported, or stored together in the same vehicle or facility. |
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May be loaded, transported, or stored together. |
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May be loaded, transported, or stored together only with restrictions. |
Similar substances
| UN / ID | Proper shipping name | Hazard class |
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| UN 3071 | Mercaptans, liquid, toxic, flammable, n.o.s. or Mercaptan mixtures, liquid, toxic, flammable, n.o.s., flash point not less than 23 degrees C | 6.1 |
| UN 3336 | Mercaptans, liquid, flammable, n.o.s. or Mercaptan mixture, liquid, flammable, n.o.s | 3 |
| UN 1111 | Amyl mercaptan | 3 |
| UN 2347 | Butyl mercaptan | 3 |
| UN 3054 | Cyclohexyl mercaptan | 3 |
| UN 2363 | Ethyl mercaptan | 3 |
| UN 1064 | Methyl mercaptan | 2.3 |
| UN 1670 | Perchloromethyl mercaptan | 6.1 |
| UN 2337 | Phenyl mercaptan | 6.1 |
