... -liquefied petroleum gas(LPG); -crude oil, also for heated and/or viscous liquids; -oil or water based latex products, polyester ... ; -herbicide; -sodium hydroxide (caustic) solutions, high sulfur crude oil (LACT and NOD) and other alkaline pH liquids -abrasive ... 5, 4.0, 6.3medium: petroleum, high water-content crude oil, low/middle/high viscocity petrochemical & chemical solvents.indicator function ...