Home >> Application >> By Standard >> ISO >> ISO 1 ~ 4999 >> ISO 75-1, ASTM D648 Plastic Temperature of deflection under load

ISO 75-1, ASTM D648 Plastic Temperature of deflection under load

Share:

ISO 75-1 Plastics -- Determination of temperature of deflection under load.

ISO 75-1 specifies a general test method for the determination of the temperature of deflection under load (flexural stress under three-point loading) of plastics. Different types of test specimen and different constant loads are defined to suit different types of material. It is determined for materials such as thermoplastics, hard rubber and duroplastic laminates.

Test Scope:

Heat deflection temperature is defined as the temperature at which a standard test bar deflects a specified distance under a load. It is used to determine short-term heat resistance. It distinguishes between materials that are able to sustain light loads at high temperatures and those that lose rigidity over a narrow temperature range.

Test Procedure:
The bars are placed under the deflection measuring device. A load of 0.45 MPa or 1.80 MPa is placed on each specimen. The specimens are then lowered into a silicone oil bath where the temperature is raised at 2° C per minute until they deflect 0.25 mm for ASTM, 0.32 mm for ISO flatwise, and 0.34 mm for ISO edgewise.

Test Data:

Temperature at the specified load and deflection.


Specimen size:

ASTM D648standard bar 5" x ½" x ¼"
ISO edgewiseuses a bar 120mm x 10mm x 4mm. 
ISO flatwiseuses a bar 80mm x 10mm x 4mm.


< Previous: ISO 62 Moisture content test water absorption of plastics

> Next: ISO 105-X12 Textiles Tests for colour fastness to rubbing

Require More Customized Solutions?

We offer customization to meet your specific needs. Our expert team will collaborate with you to develop the perfect product for you
Customize Now

Beijing United Test Co., Ltd.