Common test methods for insulating and sheathing materials of electric and optical cables - Part 21: Methods specific to elastomeric compounds - Ozone resistance, hot set and mineral
1 Scope
GB/T 2951 specifies the test methods to be used for testing polymeric insulating and sheathing materials of electric cables and optical cables for power distribution and telecommunications including cables used on ships, and in offshore applications.
This part of GB/T 2951 gives the methods for the ozone resistance test, hot set test and mineral oil immersion test, which apply to elastomeric compounds of wires, electric and optical cables.
1.1 Normative References
The following normative document contains provisions which, through reference in this text, constitute provisions of this part of GB/T 2951. For dated references, subsequent amendments to, or revisions of, any of these publications do not apply. However, parties to agreements based on this part are encouraged to investigate the possibility of applying the most recent edition of the normative document indicated below. For undated references, the latest edition of the normative document referred to applies.
GB/T 2951.11-2008 Common Test Methods for Insulating and Sheathing Materials of Electric Cables and Optical Cables — Part 11: Methods for General Application — Measurement of Thickness and Overall Dimensions — Tests for Determining the Mechanical Properties (IEC 60811-1-1:1993, IDT)
GB/T 2951.12-2008 Common Test Methods for Insulating and Sheathing Materials of Electric Cables and Optical Cables — Part 12: Methods for General Application — Thermal Ageing Methods (IEC 60811-1-2:1985, IDT)
ISO 1817:1999 Plastics — Methods for Determining the Density and Relative Density of Non-cellular Plastics
2 Test Values
Full test conditions (such as temperatures, durations, etc.) and full test requirements are not specified in this standard; it is intended that they should be specified by the standard dealing with the relevant type of cable.
Foreword II
1 Scope
1.1 Normative References
2 Test Values
3 Applicability
4 Type Tests and Other Tests
5 Pre-conditioning
6 Test Temperature
7 Median Value
8 Ozone Resistance Test
8.1 Test Method
8.2 Determination of Ozone Concentration
9 Hot Set Test
9.2 Test Apparatus
9.4 Evaluation of Results
10 Mineral Oil Immersion Test for Sheaths
10.1 Sampling and Preparation of the Test Pieces
10.2 Determination of the Cross-sectional Area of the Test Piece
10.3 Oil to be Used
10.4 Procedure
10.5 Determination of Mechanical Properties
10.6 Expression of Results
