ISO 75-2:2013 PDF

Scope: This part of ISO 75 specifies three methods, using different values of constant flexural stress, which can be used for the determination of the temperature of deflection under load of plastics (including filled plastics and fibre-reinforced plastics in which the fibre length, prior to processing, is up to 7,5 mm) and ebonite: — method A, using a flexural stress of 1,80 MPa; — method B, using a flexural stress of 0,45 MPa; — method C, using a flexural stress of 8,00 MPa. The standard deflection, Δs, used to determine the temperature of deflection under load corresponds to a flexural-strain increase, Δεf, defined in this part of ISO 75. The initial flexural strain due to the loading of the specimen at room temperature is neither specified nor measured in this part of ISO 75. The ratio of this flexural-strain increase to the initial flexural strain depends on the modulus of elasticity, at room temperature, of the material under test. This method is, therefore, only suitable for comparing the temperatures of deflection of materials with similar room-temperature elastic properties. NOTE 1 The methods give better reproducibility with amorphous plastics than with semi-crystalline ones. With some materials, it can be necessary to anneal the test specimens to obtain reliable results. Annealing procedures, if used, generally result in an increase in the temperature of deflection under load (see 6.6). NOTE 2 For additional information, see ISO 75-1:2013, Clause 1.

ISO 75-2:2013 Referenced Document

ISO 10724-1 Plastics - Injection moulding of test specimens of thermosetting powder moulding compounds (PMCs) - Part 1: General principles and moulding of multipurpose test specimens
ISO 20753 Plastics*， 2023-11-01 Update
ISO 2818 Plastics — Preparation of test specimens by machining*， 2018-12-13 Update
ISO 293 Plastics — Compression moulding of test specimens of thermoplastic materials*， 2023-02-21 Update
ISO 294-1 Plastics - Injection moulding of test specimens of thermoplastic materials - Part 1: General principles, and moulding of multipurpose and bar test specimens*， 2017-05-01 Update
ISO 75-1 Plastics — Determination of temperature of deflection under load — Part 3: High-strength thermosetting laminates and long-fibre-reinforced plastics*， 2020-02-28 Update

2013 ISO 75-2:2013 Plastics - Determination of temperature of deflection under load - Part 2: Plastics and ebonite
2004 ISO 75-2:2004 Plastics - Determination of temperature of deflection under load - Part 2: Plastics and ebonite
1993 ISO 75-2:1993 Plastics; determination of temperature of deflection under load; part 2: plastics and ebonite