Glossary | A | B | C | D | E | F | G | H | I | J | K | L | M | N | O | P | Q | R | S | T | U | V | W | X | Y | Z | Halons Fire-extinguishing agents with high ODPs.   HCFC Hydrochlorofluorocarbon.   HFC Hydrofluorocarbon.   Hydrocarbon An organic chemical composed only of hydrogen and carbon. Gaseous or volatile hydrocarbons are flammable.   Hydrocarbon/surfactant blend A mixture of low-volatility hydrocarbon solvents with surfactants, allowing the use of a two-phase cleaning process. The first phase is solvent cleaning in the blend and the second phase is water cleaning to remove the residues of the blend and any other water-soluble soils. The surfactant ensures the water-solubility of the otherwise insoluble hydrocarbon. Terpenes are often used in this application.   Hydrochlorocarbon An organic chemical composed of hydrogen, chlorine and carbon, e.g., trichloroethylene.   Hydrochlorofluorocarbon An organic chemical composed of hydrogen, chlorine, fluorine, and carbon atoms. These chemicals are less stable than pure CFCs, thereby having generally lower ODPs.   Hydrolysis A chemical reaction of a substance with water, leading to decomposition or other change of substance.   Hydrophilic Water loving or having a strong affinity for water.   Hydrophobic Water hating or having a strong aversion to water.   | A | B | C | D | E | F | G | H | I | J | K | L | M | N | O | P | Q | R | S | T | U | V | W | X | Y | Z | State Information | Glossary | Conversion Checklist | Comments Home | Process Advisor | Alternatives | Links | Search All SAGE material, Copyright© 1992, Research Triangle Institute Last Update: 09 March 1999 sage@rti.org http://clean.rti.org/gloss.cfm?letter=H