ISO/DIS 11357-4.3

DRAFT INTERNATIONAL STANDARD ISO/DIS 11357-4.3
ISO/TC 61/SC 5 Secretariat: SNV
Voting begins on Voting terminates on
2001-08-02 2001-10-02

INTERNATIONAL ORGANIZATION FOR STANDARDIZATION • МЕЖДУНАРОДНАЯ ОРГАНИЗАЦИЯ ПО СТАНДАРТИЗАЦИИ • ORGANISATION INTERNATIONALE DE NORMALISATION

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1 Scope ..............................................................................................................................................................1

2 Normative references....................................................................................................................................1

3 Definitions ......................................................................................................................................................1

4 Principle..........................................................................................................................................................2

5 Apparatus .......................................................................................................................................................3

6 Test specimen................................................................................................................................................3

7 Testing conditions and conditioning of the test specimen.......................................................................4

8 Procedure .......................................................................................................................................................4

9 Determination of specific heat capacities...................................................................................................7

10 Report .............................................................................................................................................................7

Annex A (informative) An approximate expression of specific heat capacity of pure α-alumina [3~5]...........8

Bibliography..............................................................................................................................................................10

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International Standard ISO 11357-4 was prepared by Technical Committee ISO/TC 61, Plastics, Subcommittee

ISO 11357 consists of the following parts, under the general title Plastics - Differential scanning calorimetry (DSC):

 Part 3: Determination of temperature and enthalpy of melting and crystallization

 Part 5: Determination of polymerization temperatures and/or times and polymerization kinetics

A list of standards related to this part of ISO 11357 is given in the bibliography.

This International Standard specifies the method for determining of specific heat capacity of plastics by differential

The following standards contain the provisions which, through reference in this text, constitute provisions of this

International Standard. At the time of publication, the editions indicated were valid. All standards are subject to

revision, and parties to agreements based on this International Standard are encouraged to investigate the

possibility of applying the most recent edition of the standards indicated below. Members of IEC and ISO maintain

ISO11357-1, Plastics-Differential Scanning Calorimetry (DSC) - Part 1: General principles.

For the purposes of this International Standard, the terms and definitions given in ISO 11357-1 and the following

NOTE Usually, α-alumina (such as synthetic sapphire ) of 99.9% or higher purity is used as a calibration material.

The quantity of heat necessary to raise the temperature of unit mass of material by 1 K at constant pressure. It is

where m is the mass of the material, C is the heat capacity and dQ is the heat quantity necessary to raise the

temperature of the material by dT. Subscript p indicates an isobaric process. c is expressed in kilojoules per

This equation is valid in a temperature range where a material shows no first order phase transition.

Each measurement consists of three test at the same scanning rate runs as follow (figure 1) (Annex A[1,2]):

Based on the DSC principle (ISO 11357-1) and the definition of the specific heat capacity as described in 3.2, the

following relations are obtained, where P is dQ / dt , specimen is a part of sample for measurement and the

NOTE Certain types of DSC can be calibrated using electrical calibration (Joule effect). In this case, it is not needed to

Figure 1 — Typical DSC curve on specific heat capacity measurement after baseline adjuststment

NOTE 1 Pans for the test specimen and the reference should be of the same shape, material and the mass should be

NOTE 2 The same blank run and calibration run can be used for several measurements, if the instrument is sufficiently

stable and the mass difference between calibration material pan and empty pan is corrected. An adequate correction can be

obtained by adding the term c (T) β ∆m to the heat flow rate signal of the sample, where c is specific heat capacity of