【国外标准】 Standard Test Method for Aluminum Scratch of 1,1,1-Trichloroethane to Determine Stability (Withdrawn 2017)

The degradation of insufficiently stabilized 1,1,1-trichloroethane, in the presence of aluminum, results in the formation of hydrochloric acid and polymeric residue. Thus, if such degradation is allowed to continue, the aluminum will be corroded and the 1,1,1-trichloroethane rendered unusable. The presence of free water invalidates this test method.This test method can be used to determine if 1,1,1-trichloroethane is sufficiently stabilized to inhibit reaction with aluminum or aluminum alloys. Solvent passing this test method still may not be stable for all applications. Consult a producer for use applications.Aluminum should not be used as a material of construction for pumps, tanks, pipelines, valves, spray equipment, or other handling equipment used for chlorinated solvents. Properly stabilized halogenated solvents are, however, commonly used in cleaning aluminum and other sensitive metals.1.1 This is a screening test method to determine if sufficient inhibitors are present in 1,1,1-trichloroethane to provide at least minimal stability in the presence of aluminum.1.2 Solvent passing this test method may not be stable for all applications.1.3 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use. A specific hazard statement is given in Section 6.