Some Experiments on Hydraulic Brake Fluid Swelling of Piston-cup by Several Glycols

摘要

The results and the method of experiments which have been made on the rate of swelling of piston-cup by several liquids are described. Liquids under tests are those, diacetone alcohol, ethyl glycol， butyl glycol， propylene glycol and hexylene glycol. Using optical lever，the swelling rate is measured on elongation of the base-diameter of a cup. which has been vertically held in the liquid，temperature of which is gradually elevated to 70℃ and is then being left to natural cooling.