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BSI BS EN ISO 75-2:2013

Plastics. Determination of temperature of deflection under load -- Plastics and ebonite
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BSI BS EN ISO 75-2:2013

Plastics. Determination of temperature of deflection under load -- Plastics and ebonite

PUBLISH DATE 2013
PAGES 20
BSI BS EN ISO 75-2:2013

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.

SDO BSI: British Standards Institution
Document Number ISO 75-2
Publication Date April 30, 2013
Language en - English
Page Count
Revision Level
Supercedes
Committee PRI/21
Publish Date Document Id Type View
April 30, 2013 BS EN ISO 75-2:2013 Revision
May 28, 2004 BS EN ISO 75-2:2004 Revision
Jan. 15, 1994 BS EN ISO 75-2:1996 Revision
Aug. 31, 2006 BS EN ISO 75-2:2004 Consolidated