Machinery Lubrication magazine published by Noria Corporation
Issue link: https://www.e-digitaleditions.com/i/1032074
www . machinerylubrication.com | September - October 2018 | 39 HFB, HFC, HFDR and HFDU. ese fire-resistant hydraulic f luids, along with the HFDS and HFDT categories, are shown in the table on the right. Oil-in-Water Emulsions ese emulsions are formulated to sustain small droplets of oil dispersed in water with constituents of 95 percent water and 5 percent oil. With the vast majority of the formulation containing water, there are distinctive tradeoffs in comparison to a typical hydraulic oil. is level of water content may offer excellent fire resistance and heat-transfer capabilities, but this results in poor lubricity properties and loss of natural corrosion protection. Oil-in-water emulsions tend to rely on additives to provide a more appropriate level of corrosion protection. Due to their low viscosity and limited wear protection capabilities, they tend to be used only in special applications that have low lubricity requirements. Water-in-Oil Emulsions ese are called inverse emulsions where the oil is in the majority. Small water droplets are dispersed in oil with constituents of 40 percent water and 60 percent oil. is formulation provides a more balanced package with good fire resistance and excellent heat-transfer capabilities. Although these emulsions have better lubricity and corrosion protection than oil-in-water emulsions, additives are still needed to meet the minimum lubrication requirements for CATEGORY SYMBOL GENERAL CHARACTERISTICS HH Non-inhibited solvent-refined mineral oils (-10°C to 90°C) HL Refined mineral oil with improved anti-rust and antioxidant properties (-10°C to 90°C) HM HL type oils with improved anti-wear properties (-20°C to 90°C) HR HL type oils with improved viscosity/temperature properties (-35°C to 120°C) HV HM type oils with improved viscosity/temperature properties (-35°C to 120°C) HG HM type oils with anti-slip, anti-sticking properties HS Synthetic fluids with non-fire-resistant properties HFAE Fire-resistant oil-in-water emulsions with a maximum 20% weight of combustible materials HFAS Fire-resistant solutions of a chemical in water with a minimum of 80% water weight HFB Fire-resistant emulsions of water in oil HFC Fire-resistant fluids of water-polymer solutions with a minimum of 35% water weight HFDR Synthetic fire-resistant fluids that are phosphate-ester based HFDS Synthetic fire-resistant fluids that are chlorinated and hydrocarbon based HFDT Synthetic fire-resistant fluids consisting of HFDR and HFDS blends HFDU Other types of synthetic fire-resistant fluids ML K N O W w h e n t o s t o p a d d i n g G R E A S E P r e v e n t O v e r - L u b r i c a t i o n Monitor grease usage & costs with the Ultraprobe 401 Grease Caddy Pro. ® call 1-800-223-1325 -- info@uesystems.com Learn more: www.uesystems.com/ML7 GROUP DESCRIPTION TYPICAL QUALIFYING FLUIDS 0 Non-flammable; 4 kJ/g or less net heat of complete combustion; secondary fire-suppression equipment not required Phosphate ester 1 Usually unable to stabilize a spray flame; spray flammability parameter (SFP) of 5 x 10⁴ or less; secondary fire-suppression equipment not required Water-glycol, polyolester 2 Less flammable than mineral oils, but stabilized flame under certain conditions; SFP greater than 5 x 104, but less than 10 x 104 Oil-in-water emulsions Types of Fire-resistant Hydraulic Fluids 3 Levels of Flammability Requirements for Lubricants According to the FM 6930 Standard Visit us at Booth #206