Spontaneous combustion Class

Pyrophoric and other spontaneously combustible substances will generally be identified as such on their product literature, material safety data sheets (MSDSs), or International Chemical Safety Cards (ICSCs). If transported, these substances should be identified as DOT/UN Hazard Class 4.2 materials for shipping purposes and labeled as spontaneously combustible. For pyrophoric substances, the NFPA 704 diamond for container or vessel labeling has a red (top) quadrant with a rating of 4, indicating the highest severity of flammability hazard (NFPA 704, 2001). Note that pyrophoric materials often exhibit one or more other reactivity hazards as well, such as water reactivity. 

Is any substance identified as spontaneously combustible YES Sodium hydrosulfite is DOT/UN Hazard Class 4.2, Spontaneously Combustible Material finely divided aluminum powder is pyrophoric without oxide coating... 

Class 4 Flammable Solid Spontaneously combustible material and Dangerous when wet material... 

Hazard Class 4 - Division 4.2. Spontaneously Combustible Materials (These include pyrophoric materials and self-heating materials) ... 

Class 4 Inflammable solids, substances liable to spontaneous combustion, substances which on contact with water, emit inflammable gases. 

DOT CLASSIFICATION 4.3 Label Dangerous When Wet (UN 2950) DOT Class 4.1 Label Flammable Solid (UN 1869) DOT Class 4.3 Label Danger When Wet, Spontaneously Combustible SAFETY PROFILE Inhalation of dust and fumes can cause metal fume fever. The powdered metal ignites readily on the skin causing burns. Particles embedded in the skin can produce gaseous blebs that heal slowly. 

DOT CLASSIFICATION 4.2 Label Spontaneously Combustible (UN 1382) DOT Class 8 Label Corrosive (UN 1847) SAFETY PROFILE Poison by ingestion and inhalation. Emits H2S in contact with acids steam. A flammable solid. Unstable may explode on percussion or rapid heating. Ignites on contact with nitrogen oxide. Reacts with H2O to form KOH and KSH. When heated to decomposition it emits very... 

DOT CLASSIFICATION 8 Label Corrosive, Poison (NA 2922) DOT Class 4.2 Label Spontaneously Combustible (UN 2318) DOT Class 8 Label Corrosive (UN 2949) SAFETY PROFILE Poison by intraperitoneal and subcutaneous routes. Mutation data reported. A corrosive irritant to skin, eyes, and mucous membranes. Flammable when exposed to heat or flame. Spontaneous combustion. Reacts violently with dia2onium salts. Readily yields H2S. 

DOT CLASSIFICATION 4.2 Label Spontaneously Combustible, Corrosive (UN 1431) DOT Class 3 Label Flammable Liquid (UN 1289)... 

DOT CLASSIFICATION 4.3 Label Dangerous When Wet, Spontaneously Combustible DOT Class 4.3 Label Dangerous When Wet (UN 1435)... 

NOTE 2 The criteria are based on the self-ignition temperature of charcoal, which is 50°C for a sample cube of 27 rrf. Substances and mixtures with a temperature of spontaneous combustion higher than 50°C for a volume of 27 m should not be assigned to this hazard class. Substances and mixtures with a spontaneous ignition temperature higher than 50°C for a volume of 450 litres should not be assigned to hazard Category 1 of this hazard class. 

For the purpose of the DOT regulation, Flammable solid is any solid material, other than one classed as an explosive, which under conditions normally incident to transportation is liable to cause fires through friction, retained heat from manufacturing or processing, or which can be ignited readily and persistently as to create a serious transportation hazard. Included in this class are spontaneously combustible and water-reactive materials. (49CFR 173.150)... 

REGULATORY INFORMATION Al CAL DOT hazard class/division (4.2)(UN2545) labels (spontaneously combustible) DOT hazard class/division (4.1)(UN1326) labels (flammable solid). 

REGULATORY INFORMATION Al DOT hazard class/division (7) labels (radioactive, spontaneously combustible). 

Hazard Class 4 is composed of flammable solids. Additionally, some pyrophoric and water-reactive liquids are included under the 4.2 Spontaneously Combustible and... 

The DOT divides the flammable solid hazard class into three divisions 4.1 Flammable Solids, 4.2 Spontaneous Combustibles, and 4.3 Dangerous When Wet... 

Class 4.2 Spontaneously Combustible contains which types of materials ... 

Pyrophoric substances, which are substances, including mixtures and solutions (liquid or solid) which even in small quantities ignite on contact with air within five minutes. These Class 4.2 substances are the most liable to spontaneous combustion. 

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