IEC 60811-404 pdf download

IEC 60811-404 pdf download.Electric and optical fibre cables – Test methods for non-metallic materials
1 Scope
This Part 404 of IEC 6081 1 specifies the method for a mineral oil immersion test, which typically applies to cross-linked compounds used for sheathing materials.
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 IEC 6081 1 -501 , Electric and optical fibre cables – Test methods for non-metallic materials – Part 501: Mechanical tests – Tests for determining the mechanical properties of insulating and sheathing compounds ISO 1 81 7, Rubber, vulcanized – Determination of the effect of liquids
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. Unless otherwise specified, tests shall be carried out at room temperature. 4.2 Pre-conditioning All the tests shall be carried out not less than 1 6 h after the extrusion or cross-linking, if any, of the sheathing compounds. 4.3 Sample and test piece preparation Five test pieces shall be prepared in accordance with the procedures described in IEC 6081 1 -501 . 4.4 Determination of the cross-sectional area of the test piece See the test method in IEC 6081 1 -501 .4.5 Oil to be used Unless otherwise agreed, the mineral oil to be used shall be oil no. 2 (IRM 902) as described in ISO 1 81 7. 4.6 Procedure The test pieces shall be immersed in the oil bath, previously heated to the specified test temperature, and shall be maintained in the oil at that temperature for the specified time (see standard for the type of cable). At the end of the specific duration, the test pieces shall be removed from the oil, blotted lightly to remove excess oil and suspended in air at ambient temperature for at least 1 6 h but not more than 24 h, unless otherwise specified in the relevant cable standard. At the end of this period, any further excess oil shall be removed by lightly blotting the test pieces. 4.7 Determination of mechanical properties See the test method in IEC 6081 1 -501 . 4.8 Expression of results The calculation of tensile strength shall be based on the cross-sectional area of the test piece measured before immersion (see 4.2.2). The difference between the median value obtained on the five test pieces immersed in oil and the median value of the values obtained for the untreated test pieces (see IEC 6081 1 -501 ), expressed as a percentage of the latter, shall not exceed the percentage specified in the standard for the type of cable.