Terminology - S

  • SAMPLE: A unit, collection of units, or a section of a unit taken from a sampling lot.
  • SAMPLE INSPECTION: The number of units taken from a lot for the purpose of examination or test.
  • SAMPING PLAN: A procedure which specifies the number of units of product from a lot which are to be inspected, and the criterion for acceptability of the lot.
  • SBR: Styrene Butadiene Rubber (SBR) is a synthetic copolymer of styrene and butadiene. SBR has good resistance to abrasion and water. It bonds well to itself and many other materials.
  • SHORE A HARDNESS: An indentation method of rating the hardness of rubber using a shore durometer with the A scale from 0-100. Learn more about durometer hardness scales.
  • SHRINKAGE: Contraction of molded rubber upon cooling.
  • SILICONE RUBBER: Silicone elastomers can be compounded to withstand temperatures as high as 600°F without serious deterioration, and retains flexibility 150°F. Silicone has lower strength than other elastomers, yet exhibits excellent fatigue and flex resistance.
  • SKIN: A relatively dense layer at the surface of a cellular material.
  • SLUICE GATE: Usually a smaller, rectangular type of gate used to control water level or flow. May also be a small radial type of gate.
  • SPECIFIC GRAVITY: The ratio of the weight of a given substance to the weight of an equal volume of water at a specified temperature.
  • SPILLWAY: An opening in a dam for water overflow usually closed off with some type of gate (radial or vertical lift), but may be uncontrolled. An open area for high water to overflow.
  • SPLICE/SPLICING: The uniting of two parts of a rubber product to form a continuous length or piece.
  • SPONGE RUBBER: Cellular rubber consisting predominantly of open cells made from a solid rubber compound.
  • SQUARENESS: The quality of being at an angle of 90°.
  • STOPLOG: Similar to a bulkhead. Smaller and stacked in sections on top of each other, usually removable one at a time.
  • SURFACE GROUND: The grinding of the surface of a rubber product to produce close dimensional tolerances.
  • SWELLING: The increase in volume or linear dimensions, of a specimen immersed in a liquid or exposed to a vapor.
  • SWING GATE: A small to medium sized gate, used in a levee opening. Gate is equipped to swing on hinges from one end to open or close for flood control.