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ACM -
polyacrylate rubber
ACN -
acrylonitrile; component in nitrile rubber
AISI -
American Iron and Steel Institute
ASTM -
American Society for Testing and Materials
DIA -
diameter
DRO -
dynamic run-out
FDA -
Food and Drug Administration
FEPM -
tetrafluoroethylene-propylene rubber
FKM -
fluoroelastomer
FPM -
feet per minute; used as a measure of surface speed
at the contact point between a seal and the shaft
HNBR -
hydrogenated nitrile rubber
HSN -
highly saturated nitrile; alternative name for HNBR
ID -
inside diameter
IN -
inch
IRHD -
International Rubber Hardness degrees
IRM -
Industry Reference Material, as in IRM 903 oil
ISO -
International Organization for Standardization
KN/M -
kilonewtons per meter; SI equivalent
of pli; sometimes a unit of
measure in ASTM D 2000 line
call-outs
LOP -
lip opening pressure
MAX -
maximum
MDR -
moving die rheometer
MIN -
minimum
MPA -
megapascal; SI equivalent of psi;
sometimes a unit of measure in ASTM D
2000 line call-outs
NBR -
nitrile butadiene rubber (Buna N); copolymer of
acrylonitrile and butadiene
NBS -
National Bureau of Standards
NSF -
National Sanitation Foundation
OD -
outside diameter
ODR -
oscillating disk rheometer
OOR -
out-of-roundness
OSHA -
Occupational Safety and Health Administration
PLI -
pounds per linear inch
PSI -
pounds per square inch
PTFE -
polytetrafluoroethylene; a fluoroplastic
RA -
roughness arithmetic average in surface measurements
RMA -
Rubber Manufacturers Association
RPA -
rubber process analyzer
RPM -
revolutions per minute; also the average peak to
mean height in surface measurements
RWD -
radial wall dimension
RWV -
radial wall variation
RZ -
average peak to valley height in surface measurements
SAE -
Society of Automotive Engineers
SG -
specific gravity
SI -
denotes The International System of Units (the
modern metric system); taken from the French, “Le
Système International d’Unités”
SPEC -
specification
STBM -
shaft-to-bore misalignment; phenomenon in which
the shaft and the bore do not share a common center
TIR -
Total Indicator Reading
UV -
ultraviolet light
VMQ -
vinyl methyl silicone rubber
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