Evaluation of the Flush/Fill and High-Pressure Air Purge Procedures for Converting Army Vehicles to Silicone Brake Fluid

摘要

Tests were undertaken to evaluate flush/fill and high-pressure air purging techniques for converting Army vehicles to silicone brake fluids. The flush and fill procedure gave high residual polyglycol levels, particularly in vehicles with calipers. The M-151 series can be effectively converted by this method. The high-pressure air purge technique introduces the safety concerns of flammability and toxicity of the mists and vapors. Literature data on the health hazards of glycol materials indicated that personnel exposure should not be allowed, and that atmospheric levels should be monitored to insure compliance with regulations. In addition, the bioassay program at National Cancer Institute (NCI) should be monitored for the possible carcinogenicity of potential breakdown products. The flammability of mists and vapors of polyglycol fluids indicates that these mists and vapors should not be vented in inclosed areas especially in the vicinity of an ignition source. The air entrainment of a polyglycol and the three silicone brake fluids were measured at various temperatures by the use of a turbidimeter. The air entrainment of the silicones was, in general, lower than that of the polyglycol. (Author)