{"id":25207,"date":"2023-06-14T10:06:10","date_gmt":"2023-06-14T10:06:10","guid":{"rendered":"https:\/\/specialcargo.com\/blog\/explanation-of-adr-hazard-classes\/"},"modified":"2025-08-11T14:05:36","modified_gmt":"2025-08-11T14:05:36","slug":"explanation-adr-hazard-classes","status":"publish","type":"post","link":"https:\/\/college.specialcargo.com\/en\/blog\/knowledge-base\/explanation-adr-hazard-classes\/","title":{"rendered":"Explanation of ADR hazard classes"},"content":{"rendered":"
\n

Explanation of ADR hazard classes<\/h2>\n<\/div><\/div><\/div>\n\n
\n

Is there a logic to the structure of the hazard classes?<\/strong><\/p>\n<\/div><\/div><\/div>\n\n

\n

Historically, the transportation of dangerous goods began with the transportation of gunpowder. Therefore, explosive substances and objects are number one.<\/p>\n<\/div><\/div><\/div>\n\n

\n
1<\/th>Explosive substances and objects<\/td><\/tr><\/tbody><\/table><\/figure>\n<\/div><\/div><\/div>\n\n
\n

Classes 2, 3 and 4.1 are distinguished, among other things, by the form of the substances, also called aggregation states, namely “gas,” “liquid” and “solid.<\/p>\n<\/div><\/div><\/div>\n\n

\n
2<\/th>Gases<\/strong><\/td><\/tr>
3<\/th>Flammable liquids<\/strong><\/td><\/tr>
4.1<\/th>– Combustible solids<\/strong><\/td><\/tr>
 <\/th>– Self-depleting substances (liquid\/solid)<\/td><\/tr><\/tbody><\/table><\/figure>\n<\/div><\/div><\/div>\n\n
\n

What Classes 3, 4.1, 4.2 and 4.3 have in common is flammability.<\/p>\n<\/div><\/div><\/div>\n\n

\n

NOTES. Class 4.1 includes 2 types of substances. Self-depleting substances can react violently to heat and in contact with other substances (fire and\/or explosion hazard).<\/p>\n<\/div><\/div><\/div>\n\n

\n

Self-ignition\/self-heating can occur in a reaction with oxygen.<\/p>\n<\/div><\/div><\/div>\n\n

\n

The numbers 1, 2 and 3 after the 4 allow you to relate to classes 1, 2 and 3.<\/p>\n<\/div><\/div><\/div>\n\n

\n
    \n
  • 1= the explosion hazard<\/strong> of self-reactive substances<\/li>\n\n\n\n
  • 2= the reaction with gas<\/strong> (oxygen) of self-igniting substances<\/li>\n\n\n\n
  • 3= the reaction with liquid<\/strong> (water) of substances that develop flammable gases with water<\/li>\n<\/ul>\n<\/div><\/div><\/div>\n\n
    \n
    3<\/th>Flammable liquids<\/td><\/tr>
    4.1<\/th>– Combustible solids<\/td><\/tr>
     <\/th>– Self-depleting substances (liquid\/solid)<\/td><\/tr>
    4.2<\/th>Substances susceptible to self-ignition<\/td><\/tr>
    4.3<\/th>Substances that develop flammable gas with water<\/td><\/tr><\/tbody><\/table><\/figure>\n<\/div><\/div><\/div>\n\n
    \n

    The substances of 5.1 and 5.2 are both oxidizing (oxygenated). They both begin with the letter “O.
    Organic peroxides, in addition to being oxidizing, are flammable (organic) and self-reactive (can break apart violently).<\/p>\n<\/div><\/div><\/div>\n\n

    \n
    5.1<\/th>Oxidizing substances<\/td><\/tr>
    5.2<\/th>Organic peroxides (self-reactive)<\/td><\/tr><\/tbody><\/table><\/figure>\n<\/div><\/div><\/div>\n\n
    \n

    The substances in 6.1 and 6.2 are bad for health when ingested. The inverted 6.1 looks like 9i(ftig).<\/p>\n<\/div><\/div><\/div>\n\n

    \n
    6.1<\/th>Toxic substances<\/td><\/tr>
    6.2<\/th>Infectious substances<\/td><\/tr><\/tbody><\/table><\/figure>\n<\/div><\/div><\/div>\n\n
    \n

    Classes 1 and 7 are separate examinations. They do belong to the general knowledge of hazard classes.<\/p>\n<\/div><\/div><\/div>\n\n

    \n
    7<\/th>Radioactive substances<\/td><\/tr><\/tbody><\/table><\/figure>\n<\/div><\/div><\/div>\n\n
    \n

    The capital letter B(ijtend) resembles the 8 of class 8.<\/p>\n<\/div><\/div><\/div>\n\n

    \n
    8<\/th>Corrosive substances<\/td><\/tr><\/tbody><\/table><\/figure>\n<\/div><\/div><\/div>\n\n
    \n

    Class 9 substances are different from each other: environmentally hazardous, asbestos, heated substances, etc.<\/p>\n<\/div><\/div><\/div>\n\n

    \n
    9<\/th>Miscellaneous hazardous substances and objects<\/td><\/tr><\/tbody><\/table><\/figure>\n<\/div><\/div><\/div>\n\n
    \n

     <\/p>\n<\/div><\/div><\/div>\n\n

    \n

    Danger labels<\/strong><\/p>\n<\/div><\/div><\/div>\n\n

    \n

    The hazard characteristics of the different hazard classes are indicated by the hazard labels below.<\/p>\n<\/div><\/div><\/div>\n\n\n

    \"\"<\/figure>\n\n\n
    \n

    <\/p>\n<\/div><\/div><\/div>","protected":false},"excerpt":{"rendered":"

    Explanation of ADR hazard classes Is there a logic to the structure of the hazard classes? Historically, the transportation of dangerous goods began with the transportation of gunpowder. Therefore, explosive substances and objects are number one. 1 Explosive substances and objects Classes 2, 3 and 4.1 are distinguished, among other things, by the form of […]<\/p>\n","protected":false},"author":2,"featured_media":39080,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[49],"tags":[],"class_list":["post-25207","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-knowledge-base"],"acf":[],"yoast_head":"\nExplanation of ADR hazard classes - Special Cargo College<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/college.specialcargo.com\/en\/blog\/knowledge-base\/explanation-adr-hazard-classes\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Explanation of ADR hazard classes - Special Cargo College\" \/>\n<meta property=\"og:description\" content=\"Explanation of ADR hazard classes Is there a logic to the structure of the hazard classes? 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