Tribologie G

GALLONS
Capacity measure, English gallons = 4.54 litres, American gallons = 3.79 litres.
 

GAS ENGINE OILS
Engine oils compounded specially for the specific characteristics and in some cases aggressive constituents of various gases (sewage, natural and refinery gases, propane/butane, etc).
 

GASOLINE
a) American designation for petrol
b) Light gasoline with a boiling range of
 approx. 30 to 80°C
 

GEAR GREASES
Fluid greases for gears, mostly with sodium soap but also with Al and Ca soap greases, fibrous soft to semi-fluid greases (NLGI 0, 00, 000, and 1) for gears and gear motors with simple shaft seals, in some cases EP-compounded; DIN 51 826 consistency classification for lubricating greases DIN 51 818.
 

Gear wheel grease
Lubricant with good adhesive properties, generally for open gear wheel drives, with a bituminous base;
often addition of MoS2 and graphite. Generally diluted before application, also available in spray cans for easier application.
 

GLYCOLS
Bivalent alcohols, e.g. ethylene glycol as anti-freeze for radiators or certain polyglycols for lubricating aircraft engines.
 

GRAPHITE GREASES
Lubricating greases with graphite added.
 

Grinding oil
Coolant to grind metal surfaces, generally emulsifiable and set to the special requirements of the grinding operation.
 

GROSS CALORIFIC VALUE (Ho)
Is the quotient from the amount of heat produced by completely burning a certain quantity of fuel: DIN 5499; 51900 P1/P2/P3.