This standard is applicable to three methods using different values of constant bending stress that can be used to determine the load-deformation temperature of plastics (including filled plastics and fiber-reinforced plastics with fiber lengths before processing of up to 7.5 mm) and ebonite. - Method A: Use a bending stress of 1.80 MPa - Method B: Use a bending stress of 0.45 MPa - Method C: Use a bending stress of 8.00 MPa The standard strain Δs used for measuring load strain temperature is the bending stress defined in this standard. The strain increase corresponds to Δεf. The initial bending strain due to specimen loading at room temperature is not specified or measured in this standard. The ratio of bending-strain increase to initial bending strain depends on the elastic modulus of the material being tested at room temperature. Therefore, this method is only suitable for comparing the strain temperatures of materials with similar room temperature elastic properties.
KS M ISO 75-2:2013 history
2023KS M ISO 75-2-2023 Plastics — Determination of temperature of deflection under load–Part 3: Plastics and ebonite
0000 KS M ISO 75-2-2013(2018)
2013KS M ISO 75-2:2013 Plastics — Determination of temperature of deflection under load–Part 3: Plastics and ebonite
2003KS M ISO 75-2:2003 Plastics-Determination of temperature of deflection under load-Part 2:Plastics and ebonite