Reactive materials

Disulphur difluoride, S2F2. Two isomers, FSSF and S=SF2 formed AgF plus S. Reactive material. 

Halogenated hydrocarbons that are inexpensive sometimes are used alone or in blends with phosphate esters as fire-resistant hydrauHc fluids. Other halogenated fluids are used for oxygen-compressor lubricants, lubricants for vacuum pumps that are in contact with corrosive materials, solvent-resistant lubricants, and other lubricant appHcations where highly corrosive or reactive materials are being handled. 

Hot pressing produces compacts that have superior properties, mainly because of higher density and finer grain size. Closer dimensional tolerances than can be obtained with pressing at room temperature are also possible. Hot pressing is used only where the higher cost can be justified. It has been usehil in producing reactive materials. One use is the combination of P/M and composites to produce hot-pressed parts that are fiber reinforced. 

It frequently is necessary to charge vessels with inert gases before introducing flammable or reactive materials. The ha2ards of entering vessels that have been filled with inert atmospheres which do not support life must not be overlooked. Start-up procedures should be written in detail well ahead of actual start-up. 

Fig. 8. Steady-state model for the earth s surface geochemical system. The kiteraction of water with rocks ki the presence of photosynthesized organic matter contkiuously produces reactive material of high surface area. This process provides nutrient supply to the biosphere and, along with biota, forms the array of small particles (sods). Weatheriag imparts solutes to the water, and erosion brings particles kito surface waters and oceans.

Although all antiozonants must react rapidly with ozone, not all highly reactive materials are antiozonants. Something else in addition to the... 

The reactive species that iaitiate free-radical oxidatioa are preseat ia trace amouats. Exteasive studies (11) of the autoxidatioa mechanism have clearly estabUshed that the most reactive materials are thiols and disulfides, heterocycHc nitrogen compounds, diolefins, furans, and certain aromatic-olefin compounds. Because free-radical formation is accelerated by metal ions of copper, cobalt, and even iron (12), the presence of metals further compHcates the control of oxidation. It is difficult to avoid some metals, particularly iron, ia fuel systems. 

The F EI measures realistic maximum loss potential under adverse operating conditions. It is based on quantifiable data. It is designed for flammable, combustible, and reactive materials that are stored, handled, or processed. It does not address frequency (risk) except indirectly, nor does it address specific hazards to people except indirectly. 

Clean and chemically dry vessel prior to charging water reactive material... 

Provide adequate fixed fire protection for tanks and vessels containing flammable, unstable or reactive materials. This can include fire loops with hydrants and monitors in the storage area, foam systems for individual tanks, and deluge spray systems to keep the exposed surfaces of tanks cool in case of fire in an adjacent tank. 

CCPS G-30. Guidelines for Storage and Handling of Reactive Materials. American Institute of Chemical Engineers, Center for Chemical Process Safety, New York. 

Consequence Phase 3 Develop Detailed Quantitative Estimate of the impacts of the Accident Scenarios. Sometimes an accident scenario is not understood enough to make risk-based decisions without having a more quantitative estimation of the effects. Quantitative consequence analysis will vary according to the hazards of interest (e.g., toxic, flammable, or reactive materials), specific accident scenarios (e.g., releases, runaway reactions, fires, or explosions), and consequence type of interest (e.g., onsite impacts, offsite impacts, environmental releases). The general technique is to model release rates/quantities, dispersion of released materials, fires, and explosions, and then estimate the effects of these events on employees, the public, the facility, neighboring facilities, and the environment. 

Forests can act as sources of some of the trace gases in the atmosphere, such as hydrocarbons, hydrogen sulfide, NO, and NH3. Forests have been identified as emitters of terpene hydrocarbons. In 1960, Went (10) estimated that hydrocarbon releases to the atmosphere were on the order of 108 tons per year. Later work by Rasmussen (11) suggested that the release of terpenes from forest systems is 2 x 10 tons of reactive materials per year on a global basis. This is several times the anthropogenic input. Yet, it is important to remember that forest emissions are much more widely dispersed and less concentrated than anthropogenic emissions. Table 8-2 shows terpene emissions from different types of forest systems in the United States. 

Isocyanates are highly reactive materials and enter into a number of reactions with groups containing active hydrogen. The reactions of most important in the formation of polyurethanes are ... 

The characteristics of a chemical or substance that would categorize it as a reactive material include (1) it reacts violently with water, (2) it forms potentially explosive mixtures with water, or (3) when mixed with water or other chemicals, it generates... 

Reactive material that is compatible with the basic resin. Tends to lower the viscosity of the resin. 

Highly reactive material which, in its initial stages, has fluid-like flow properties. When activation is initiated, material transforms into a solid sta te. 

Monomer Reactive material that is compatible with the basic resin. 

Resin Highly reactive material which, in its initial stages, has fluidlike... 

Wrong choice of T. Unintentional heating. Mechanical friction. Intension of reactive material (heat transfer fluid). 

Estahlishing and pnhlishing the latest scientific, engineering, and management practices for prevention and mitigation of incidents involving toxic, flammable, and/or reactive material... 

The equivalent charge weight of TNT is calculated on the basis of the entire cloud content. FMRC recommends that a material-dependent yield factor be applied. Three types of material are distinguished Class I (relatively nonreactive materials such as propane, butane, and ordinary flammable liquids) Class II (moderately reactive materials such as ethylene, diethyl ether, and acrolein) and Class III (highly reactive materials such as acetylene). These classes were developed based on the work of Lewis (1980). Energy-based TNT equivalencies assigned to these classes are as follows ... 

In contrast to the relative inertness of solid Si to gaseous and liquid reagents, molten Si is an extremely reactive material it forms alloys or... 

Electronic materials are needed for computers and control devices purified silicon is the basic material for these applications. In addition silica glass (SiOj) is ail insulator, ahiininum an electrical conductor, and polymers are reactive materials for patterning in these devices. Control of evei"y step of energy production and traiismission is now completely dependent on electronics. 

The formation of an ash is not always deleterious, since a layer of a less reactive material may serve to restrict access to the alloy of more reactive... 

Improved battery safety as result of a high degree of multipartitioning of the reactive materials ... 

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