Common test methods for insulating and sheathing materials of electric and optical cables - Part 12: Methods for general application - Thermal ageing methods
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 thermal ageing methods which apply to the most common types of insulating and sheathing compounds (elastomeric, PVC, PE, PP, etc.).
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 2951.32-2008 Common Test Methods for Insulating and Sheathing Materials of Electric Cables and Optical Cables — Part 32: Methods Specific to PVC Compounds — Loss of Mass Test — Thermal Stability Test (IEC 60811-3-2:1985, IDT)
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.
Any test requirements which are given in this standard may be modified by the relevant cable standard to suit the needs of a particular 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 Thermal Ageing Methods
8.1 Ageing in an Air Oven
8.2 Ageing in an Air Bomb
8.3 Ageing in an Oxygen Bomb
8.4 Methods of Measuring Airflow in Ovens
