BS EN ISO 6721-2:2019
$102.76
Plastics. Determination of dynamic mechanical properties – Torsion-pendulum method
| Published By | Publication Date | Number of Pages |
| BSI | 2019 | 20 |
This document specifies two methods (A and B) for determining the linear dynamic mechanical properties of plastics, i.e. the storage and loss components of the torsional modulus, as a function of temperature, for small deformations within the frequency range from 0,1 Hz to 10 Hz.
The temperature dependence of these properties, measured over a sufficiently broad range of temperatures (for example from ?50 °C to +150 °C for most commercially available plastics), gives information on the transition regions (for example the glass transition and the melting transition) of the polymer. It also provides information concerning the onset of plastic flow.
The two methods described are not applicable to non-symmetrical laminates (see ISO 6721-3). The methods are not suitable for testing rubbers, for which the user is referred to ISO 4664-2.
PDF Catalog
| PDF Pages | PDF Title |
|---|---|
| 2 | National foreword |
| 4 | European foreword |
| 6 | Foreword |
| 7 | 1 Scope 2 Normative references 3 Terms and definitions 4 Principle |
| 9 | 5 Test apparatus 5.1 Pendulum 5.2 Inertial element 5.2.1 General 5.2.2 Method A (see Figure 1) 5.2.3 Method B (see Figure 2) 5.3 Clamps |
| 10 | 5.4 Oscillation-inducing device 5.5 Oscillation-frequency and oscillation-amplitude recording equipment 5.6 Temperature-controlled chamber 5.7 Gas supply 5.8 Temperature-measurement device 5.9 Devices for measuring test-specimen dimensions 6 Test specimens 6.1 General 6.2 Shape and dimensions |
| 11 | 6.3 Preparation 7 Number of specimens 8 Conditioning 9 Procedure 9.1 Test atmosphere 9.2 Measurement of specimen cross-section 9.3 Mounting the test specimens 9.4 Varying the temperature 9.5 Performing the test |
| 12 | 10 Expression of results 10.1 Symbols and correction factors |
| 13 | 10.2 Calculation of logarithmic decrement, Λ |
| 14 | 10.3 Calculation of torsional storage modulus,  10.4 Calculation of torsional loss modulus,  |
| 15 | 11 Precision 12 Test report |
| 16 | Annex A (normative) Influence of longitudinal force, W |
| 17 | Annex B (informative) Damping correction factor, Fd |
| 18 | Annex C (informative) Dimensional correction factor, Fc |
| 19 | Bibliography |
