ISO 75-2 Plastics - Determination of Deflection Temperature Under Load - Part 2: Standard Test for Plastics and Ebonite

EUROLAB, with its state-of-the-art accredited laboratories and expert team, provides precise and fast testing services within the scope of ISO 75-2 testing. ISO 75-2 specifies three methods using different values ​​of constant bending stress that can be used to determine the bending temperature of plastics (including filled plastics and fiber-reinforced plastics) under load.

• method A using a bending stress of 1,80 MPa;
• method B using a bending stress of 0,45 MPa;
• Method C, using a bending stress of 8,00 MPa.

The standard deviation, Δs, used to determine the bending temperature under load, corresponds to a bending-strain increase, Δεf, defined in this part of ISO 75. The initial bending strain resulting from loading the specimen at room temperature is also not specified.

The ratio of this flexural-strain increase to the initial flexural strain depends on the modulus of elasticity of the material under test at room temperature. Therefore, this method is only suitable for comparing the deflection temperatures of materials with similar room temperature elastic properties.

The methods provide better reproducibility with amorphous plastics compared to semicrystalline plastics. With some materials, test specimens may need to be annealed to obtain reliable results. annealing procedures,
used, it will usually cause an increase in the deflection temperature under load.

EUROLAB assists manufacturers with ISO 75-2 test compliance. Our test experts, with their professional working mission and principles, provide you, our manufacturers and suppliers, the best service and controlled testing process in our laboratories. Thanks to these services, businesses receive more effective, high-performance and quality testing services and provide safe, fast and uninterrupted service to their customers.