Tensile strength


Tensile strength is a measure of the strength of a material when you are pulling on it.

It is the maximum tensile load per square unit of original cross section that a material is able to withstand. Most materials are stronger in compression than they are in tension

Tensile strength is the most common measure of the strength and ductility of metals. As an example:

  • Ceramic = 40,000 psi (275 Mpa) tensile strength
  • High strength steel = 300,000, psi (2068 Mpa) tensile strength

Low tensile strength seal faces should be pressurized at their outside diameter. This is a frequent problem with “outside mounted” seals such as the non-metallic versions used in non-metallic pumps.

If an elastomer mounted at the inside diameter of the seal face is chemically attacked, and swells up it will put the seal face into tensile stress.

Drive lugs can create tensile stress problems also; especially if they are engaging a carbon, ceramic, or carbide face that has low tensile strength.