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A:R, WA7ER & HAZARDOUS ASTE LABORATORY CERTIFIED by CAL, ORNIA DEPT of HEALTH SERV-:CES Diesel #4 (roilrood diesel) is a higher boiling stroight-run or crocked petroleum distillate with o typical hydrocarbon ronae of C-11 through C-30. It is used in commerciol or industrial burner installations not requiring - preheating but having a design which accommodates the higher viscosity of Diesel #4. Like Diesel #2, the major hydocorbon components are unbronched poroffins, together with lesser amounts of olicyclics and polynucleor aromatic hydrocarbons (PNAs). An in-house listing of individual components is appended. Diesel #5 is a residual fuel rather than a distillate and often requires preheating for burning. In colder climates it may require preheating for ~ handling. Straight chain hydrocarbons dominate. Diesel #6 is a heavier residual fuel sometimes known as Bunker C. It is a high viscosity oil used in commercial and industrial heoting. It requires preheating in both the storage tank and at the burner and is therefore used only in large volume applications. Sulfur-contoining organics, unless deliberately removed, are found in larger proportions in the residul fuels than they are in the distilled fuels. Stoddard Solvent is a petroleum distillate widely used as a dry cleaning solvent. It is composed of a narrow range of saturated hydrocarbons (85 - percent) with the nonones dominating. The remaining 15 percent is composed of a narrow range of alkylbenzenes with the C-3 alkylbenzenes dominating. Recent toxicological concerns hove caused the maximum percent benzene allowed to be lowered from 2 to less than 0.02. Other narrow petroleum fractions in this J range which are sometimes used interchangeably for dry cleaning purposes may have different proportions of aliphatics and aromatics. It is sometimes called light petroleum naphtha. A typical boiling range is 220-300-F. Under some corditions, it is possible for groundwaters in contact with Stoddard solvent to develop objectionable levels of BTX. Jet. Fuels are light petroleum distillates similar to kerosine. They ore ovcilable in several forms depending on the type of jet engine in which it is intended to be used. JP-1, JP-49 JP-5 and JP-6 are military grades having flash points of 95-F, -10-F, 95-F and 100-F respectively. JP-4 is roughly egLivolent to commercial Jet B and is a mixture of 65 percent gasoline and 35 percent light petroleum distillate. JP-5 is a specially refined kerosine having a low freezing point and a relatively high floshpoint. These properties made it preferable for use by carrier based aircraft. JP-6 is a slightly higher cut with fewer impurities and is used in more advanced engines. Jet A and Jet A-1 are commercial kerosine fuels resembling JP-6 and JP-5 - ret:pectively. A-1 is preferred for long range flights while A is preferred for short and medium range flights. Page 2 CENTRAL. CCAST ANALYTICAL SER':ICES Son Luis Cblsao. Cclifornio (845) 543-9543