The Ultimate Tensile Strength of Graphite constant displays the value of ultimate tensile strength for graphite (14 MPa).
The strength of a material is its ability to withstand an applied load without failure or plastic deformation. The capacity of a material to withstand loads tending to elongate is known as ultimate tensile strength (UTS). The UTS for graphite is 14 MPa.
Material Properties (https://material-properties.org/graphite-density-strength-hardness-melting-point/)