Priming compositions fuels

Abrasive. Any grinding or polishing material, such as emery, ground glass, carborundum, infusorial earth, pumice etc. Some of these materials are used in priming compositions in order to increase the sensitivity of other components (such as MF, KCIO, etc) to friction or impact. Crystalline SbaS3 used in priming compns functions not only as a fuel but also as an abrasive(See under Primers)... 

Primary explosives include mercury fulminate [Hg(ONC)2, melting point 160°C with explosion, density 4.2], lead azide [Pb(N3)2, density 4.0], basic lead styphnate (lead trinitroresorcinate), diazodinitrophenol, and tetrazine (a complex conjugated nitrogen compound, melting point 140 to 160°C with explosion). Most priming compositions consist of mixtures of primary explosives, fuels, and oxidants. 

Automotive underhood environments are often antagonistic to plastics. Extreme temperatures coupled with exposure to oil, fuel, and coolants will permit only the most resistant of plastic compositions to be used. The heat and chemical resistance or PPS makes it a prime candidate for such cases. 

In view of the large effect of changes in air-fuel ratio on PNA emissions, care must be taken in studying the effects of other variables, such as fuel composition, to make sure that variation in air-fuel ratio does not mask the prime variable under investigation. 

For final disposal various container concepts have been developed in accordance with the concept of final repositories. The most advanced concept exists in Sweden [12]. After storage in the CLAB facility for about 40 years, the spent fuel will be loaded in an encapsulation facility into a copper canister. There are various design concepts for this canister for final disposal. As a basic design in the KBS-3-report [13] a 80 cm diameter and 4.5 m long copper canister for 9 BWR - or 2 PWR-and 4 BWR-assemblies has been proposed. To withstand outside hydrostatic pressure and pressure from backfill material the interior space of the container was intended to be filled with copper powder or molten lead. In the meantime various alternative container concepts have been proposed. A composite copper-steel canister was selected as the prime canister alternative [14]. The design of the corresponding encapsulation facility at the CLAB site has not yet been completed. 

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