Accession Number : ADA308142

Title :   Using Different Technologies to Solve Unique Precision Cleaning Problems,

Corporate Author : AEROSPACE GUIDANCE AND METROLOGY CENTER NEWARK AFS OH

Personal Author(s) : Hunt, Don E.

PDF Url : ADA308142

Report Date : 12 NOV 1993

Pagination or Media Count : 77

Abstract : For years those industries requiring precision cleaning in their production operations had access to chemical solvents which, because of their extraordinary properties and when used with the appropriate process and equipment, would suffice to precision clean virtually everything requiring precision cleaning. Principle among these were 1,1,2-trichloro 1,2,2-trifluoroethane (CFC-113) and methyl chloroform (MCF). When the Montreal Protocol process identified these chemicals as ozone depleting chemicals (ODCs) and targeted them for complete phaseout, the industries requiring precision cleaning were challenged to develop and implement alternatives for CFC-113 and MCF. Efforts began immediately and worldwide with a great deal of success. Through those efforts there are now an abundance of alternatives for virtually every precision cleaning requirement. This sounds very impressive, and it truly is. Initially it would appear that there should no longer be any difficulties replacing CFC-113 and MCF within the industries using those chemicals for precision cleaning. However, upon examination this is definitely not the case. While it is true there are abundant alternatives, none of them are universal. For example, there is no substitute chemical that is a perfect replacement for either CFC-113 or MCF in all their applications. In addition, there are a variety of parameters associated with the alternatives that vary considerably among those alternatives. These include such things as environmental impact, cost, worker safety, flammability, storage lifetime, different levels of reactivity with different materials, and so on. To further compound the problem, these parameters vary in importance depending upon such things as the geographic area involved, type and nature of process requirements, and political concerns.

Descriptors :   *DEPLETION, *PRECISION, *CLEANING, *OZONE, REQUIREMENTS, PRODUCTION, METHYL RADICALS, CHEMICALS, REACTIVITIES, COSTS, ENVIRONMENTAL IMPACT, FLUORINE, SAFETY, ACCESS, SOLVENTS, STORAGE, GEOGRAPHIC AREAS, HALOGENATED HYDROCARBONS, CHLORINE, FLAMMABILITY, CHLOROFORM.

Subject Categories : Organic Chemistry
      Inorganic Chemistry
      Physical Chemistry
      Solvents, Cleaners, and Abrasives

Distribution Statement : APPROVED FOR PUBLIC RELEASE