IEC 60811-607:2012 pdfダウンロード

IEC 60811-607:2012 pdfダウンロード。Electric and optical fibre cables – Test methods for non-metallic materials – Part 607: Physical tests – Test for the assessment of carbon black dispersion in polyethylene and polypropylene
1 Scope
This Part 607 of IEC 6081 1 specifies test methods for carbon black dispersion that are applicable specifically to PE and PP compounds, including cellular compounds and foam skin for insulation.
2 Normative references
The following documents, in whole or in part, are normatively referenced in this document and are indispensable for its application. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.
IEC 6081 1 -1 00:201 2, Electric and optical fibre cables – Test methods for non-metallic materials – Part 100: General
ISO 1 8553:2002, Method for the assessment of the degree of pigment or carbon black dispersion in polyolefin pipes, fittings and compounds
3 Terms and definitions
For the purposes of this document, the terms and definitions given in IEC 6081 1 -1 00 apply.
4 Test method
4.1 General
This part of IEC 6081 1 shall be used in conjunction with IEC 6081 1 -1 00.
The assessment shall be carried out in accordance with ISO 1 8553. The method is suitable for use with granules of polyethylene or granule of polypropylene compound or extrusion of polyethylene or polypropylene (for example a sheath).
NOTE The method applies with less than 3 % carbon black content.
ISO 1 8553 gives two procedures for the preparation of test specimens. Either may be used,but the following recommendations apply:
– the compression procedure is primarily intended for use with polyethylene compounds, but may be used for extrusions;
– the microtome procedure is intended for use with polyethylene extrusions.
4.2 Procedure
Prepare the specified number of test specimens in accordance with ISO 1 8553.
Using the microscopic examination technique given in ISO 1 8553, examine the test specimens for
a) degree of dispersion.
b) rating of appearance.
4.3 Expression of results
Express the results of the examination in the manner given in ISO 1 8553.
4.4 Requirements
Unless otherwise stated in the relevant cable standard, the limits recommended in Annex D of ISO 1 8553:2002 shall be taken to indicate an acceptable degree of dispersion.
NOTE Annex D of ISO 1 8553:2002 states:
“The following limits are recommended:
Grading: mean (see 5.1 ) ≤3.
Appearance rating: not worse than micrograph B in Annex B (i.e. only dispersion ratings comparable to photomicrographs A1 , A2, A3 and B are acceptable).”
5 Test report
The test report shall be in accordance with that given in IEC 6081 1 -1 00.