Class IA Liquid

Class IA liquids with flashpoints below 73°F and boiling points below 100°F. An example of a Class 1A flammable liquid is n-pentane (NFPA Diamond 4). 

Flammable and combustible liquids can be designated as Class IA, IB, IC, II, IIIA, or IIIB by the classification system of NFPA 30, Flammable and Combustible Liquids Code. Class IA liquids are considered the most hazardous and Class IIIB the least hazardous. This classification system is based upon the closed-cup flash point temperature and with Class IA and Class IB liquids also the boiling point temperature of the liquid. Liquids are considered flammable if their flash points are below 100°F (37.8°C) and combustible if their flash points are at or above 100°F (37.8°C). 

When subjected to high temperature, some Class IV oxidizers (NFPA 430) can decompose and deflagrate. Additionally, compressed or liquefied flammable gases and flammable liquid vapors, especially Class IA liquids, can also produce an explosive atmosphere if released within a building or room. Chapter 2 provides additional details regarding the deflagration potential of various commodities. 

Flammability 4 Class IA flammable liquids, best to stop flow of material and allow fire to bum itself out. 

Specific codes or regulations for vehicular storage and dispensing systems for alcohol fuels do not exist. Alcohols are flammable liquids which are covered in NFPA 30, Flammable and Combustible Liquids Code [5.2], Gasoline is included under NFPA 30 as a Class IA flammable liquid, while diesel fuel is included as a combustible liquid. When alcohols are used as fuel for vehicles, they almost always have some gasoline or high vapor pressure hydrocarbons in them which... 

CFR 1910.106, Class IA flammable liquids must be limited to a maximum of... 

Glass or plastic containers up to one gallon in size may be used for Class IA or IB liquids if either (1) the liquid would be rendered unfit for its intended use by eontaet with metal, (2) the liquid would corrode a metal container so as to create a leakage hazard, (3) the process would require more than the allowed quantities of liquid of a single assay lot to be used at one time, or (4) the proeess would require the maintenance of an analytical standard liquid of a quality which is not met by the specified standards of liquids available, and the quantity of the analytical standard liquid required for any one control process exeeeds one-sixteenth the capaeity of the container allowed under Table 1. 

RocketPropella.nts, Liquid propellants have long been used to obtain maximum controUabiUty of rocket performance and, where required, maximum impulse. Three classes of rocket monopropellants exist that differ ia the chemical reactions that release energy (/) those consisting of, eg, hydrogen peroxide, ethylene oxide, C2H4O and nitroethane, CH2CH2NO2 that can undergo internal oxidation—reduction reactions (2) those... 

Phthalocyanines (Pc) constitute an important class of compounds for the formation of liquid crystals. Elements from groups Ia to Vb of the periodic table can coordinate to the four nitrogen atoms of the phthalocyanine macrocycle, leading to more than 70 types of metallic complex. Small divalent ions are accommodated in the centre of the ring forming a planar, tetracoordinated complex, while heavier ions are situated out of the plane (Figure 6.28). 

The example in Fig. 15.1 shows the classified zones in the vicinity of a tank of flammable liquid which emits a heavier-than-air vapour. The space above the tank liquid is normally classed as Zone 0 because sufficient air may be drawn in through the vent and the float switch tube when the liquid level falls or the vapour condenses on a fall in the ambient temperature, to form an explosive mixture. The level sensor would normally be intrinsically safe type EEx ia. 

---