RRadial SealCompression is applied perpendicular to the seal centerline. Reciprocating SealSeals used in moving piston and rod situations. Reinforcing AgentFillers, such as Carbon Black, added to the elastomeric batch mix to improve such physical properties as tensile strength. ResilienceThe capability of returning to original size and shape after deformation. RMARubber Manufacturer's Association. RMSRoot Mean Square. A measure of surface roughness typically applied to the machining of metal gland and shaft surfaces. RMS stands for the square root of the sum of the squares of micro-inch deviation from true flat. Rotary SealSeals for rotating shafts, with the turning shaft protruding through the I.D. (hole) of the O-ring. RubberA common name for both naturally occurring and synthetically made elastomers. Rubber, NaturalA natural product of the juices of certain tropical plants (latex), improved through heat treating with sulfur (vulcanization). Rubber, SyntheticMan-made elastomers such as Nitrile, Fluorocarbon, Silicone, etc. Running FrictionA force which resists objects already in motion. Runout (Shaft)Same as gyration. When expressed in inches along, or accompanied by abbreviation "TIR" (total indicator reading), it refers to twice the radical distance between shaft axis and axis of rotation. |
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