°C (Celsius) - see temperature scales
calcium soap grease - see grease
calorie
calorific value - see heat of combustion
carbonizable substances
carbon monoxide (CO)
carbon residue
carbon type analysis
carbonyl
carburetor
carburetor icing
carcinogen
carrier
CAS (Chemical Abstract Service) Registry Numbers
casing
casinghead gasoline - see natural gasoline
catalyst
catalytic converter
catalytic cracking
cationic emulsified asphalt - see emulsified cationic asphalt
caustic washing (scrubbing)
cavitation
Celsius (°C) - see temperature scales
centigrade - see temperature scales
centipoise - see poise or viscosity
centralized lubrication
centrifugal
CERCLA - see Comprehensive Environment Response, Compensation and Liability Act
Certificate of Analysis (C of A)
cetane
cetane improver
cetane index
cetane number
chain oil
channeling
Chemical Abstract Service Registry Numbers - see CAS Registry Numbers
chlorinated wax
chlorine - see halogen
christmas tree
chromatography
chronic effect
chronic toxicity - see chronic effect
circulating lubrication system
clay filtration
clay/silica gel analysis
Cleveland Open Cup (COC)
closed cup
cloud point
CMS asphalt - see emulsified cationic asphalt
COC - see Clevland Open Cup
coastal oil
coefficient of friction - see friction
cohesion
coke
coking
cold-end corrosion
cold-flow improver
cold sett grease - see sett grease
colloid
color scale
combustible liquid - see flammable liquid
combustion
combustion chamber
commercial oils - see API Engine Service Categories comminution
comminution
commodity product
complex soap
compounded oil
Comprehensive Environmental Response, Compensation and Liability Act (CERCLA)
compression ignition
compression-ignition engine
compression ratio
compressor
concrete form coating
condensate
congealing point
coning oil
Conradson carbon residue - see carbon residue
conservation - see energy conservation
consistency (grease) continuum mechanics
continuum mechanics
copolymer - see polymer
copper strip corrosion
Corbett Analysis of Asphalt
corrosion
corrosion inhibitor
coupling - see flexible coupling
cp (centipoise) - see viscosity
CPSC (Consumer Products Safety Commission)
CR - see neoprene rubber
cracking
crackle test
crankcase oil - see engine oil CRC - Chemical Rubber Company
CRC - Chemical Rubber Company
crop oil
CRS asphalt - see emulsified cationic asphalt
crude oil
CSS asphalt - see emulsified cationic asphalt
cSt (centistoke) - see viscosity
cut
cutback asphalt
cutting fluid
cyclic hydrocarbon
cycloalkane - see naphthene
cycloparaffin - see naphthene
cylinder oil
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Analytical Almanac 
