Hello. Sign In
Standards Store

Look Inside

ISO 75-2

3rd Edition, April 15, 2013

Complete Document

Plastics - Determination of temperature of deflection under load - Part 2: Plastics and ebonite

View Abstract
Product Details
Document History

Detail Summary

Active, Most Current

Additional Comments:
Price (USD)
Single User
In Stock
Add to Cart

People Also Bought These:

ISO 14229-1
ISO 20653
ISO 15765-2
ISO/IEC 17025

Referenced Items:

ISO 10724-1
ISO 2818
ISO 293
ISO 294-1

Product Details:

Description / Abstract:

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.

NOTE 2 For additional information, see ISO 75-1:2013, Clause 1.
The 9000 Store