| ISO: 75 | Part: 2 | Published: 1993 | Contact: BSI |
| Title | Plastics - Determination of temperature of deflection under load - Plastics and ebonite |
| Scope | This international standard specifies three methods for the determination of the temperature of deflection under load (bending stress) of plastics and ebonite. (using surface stress of 1.80MPa, 0.45MPa and 8MPa). |
| Comment | The principle of the method specified is subjecting a standard test specimen to a bending stress to produce one of the nominal surface stresses (method A: 1,80 MPa, method B: 0,45 MPa, method C: 8,00 MPa), raising the temperature at a uniform rate, measuring the temperature, at which a specified deflection occurs. The test specimens are tested in one of two positions, flatwise or edgewise, the requirements on test-specimen dimensions being different in each case. The methods give better reproducibility with amorphous plastics than with semi-crystalline ones. |
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