... by weight, of oxyethylene and oxypropylene groups with a single terminal hydroxyl group. They are water soluble at ambient temperature.Product ... PropertiesTypical Physical PropertiesArChine Syntrend 50-HB-660Viscosity,40°C,mm2/s146Viscosity,100°C,mm2/s26Viscosity index,≥210Acid number,mg,KOH/g ... ,≤0.1Flash point,°C220Pour point,°C,-45Water,%,≤0.54 ball weld load,mm0.58 Polyalkylene ...