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Scope GB/T 2951 specifies the test methods for polymer insulation and sheath materials of power distribution and communication cables and optical cables, including ships and offshore cables and optical cables. This part of GB/T 2951 specifies the measurement methods for thickness and overall dimensions, as well as the mechanical performance test methods. These methods are applicable to the most common types of insulation and sheath materials (such as elastomers, polyvinylidene nitride, polyethylene glycol, polypropylene, etc.). 1.1 Normative References: The clauses in the following documents are referred to as clauses in this part of GB/T 2951. For dated references, All subsequent modification orders (Excluding the corrected content or the revised version, both do not apply to this part. However, parties who have reached agreements based on this part are encouraged to study whether the latest versions of these documents can be used. For undated references, the latest version applies to this part. GB/T 2951.12-2008 General Test Methods for Insulating and Sheathing Materials of Electric and Optical Cables - Part 12; General Test Methods - Thermal Aging Test Method (IEC 60811-1-2:1985, IDT) GB/T 2951.13-2008 General Test Methods for Insulation and Sheath Materials of Electric and Optical Cables: Part 13, General Test Method 1- Density Determination Method - Water Absorption Test - Shrinkage Test (IEC 60811-1-31993, IDT) GB/T 2951.21-2008 General Test Methods for Insulating and Sheathing Materials of Electric and Optical Cables, Part 21- Specific Test Methods for Elastomeric Mixtures - Ozone Resistance Test - Hot Elongation Test - Mineral Oil Immersion Test (TEC6n811-2-11998, IDT) 2 Test Principles: This part does not specify all test conditions (such as temperature, duration, etc.) and all test requirements should be specified in the relevant cable product standards. Any test requirements specified in this section can be modified in relevant cable product standards to meet the needs of special types of cables. The test conditions and parameters specified in this section are applicable to the most commonly used types of insulation and sheath materials for cables, optical cables, wires, and flexible cords. The test methods specified in this section are first used for type testing. There are fundamental differences in the conditions between type tests and frequently conducted tests such as routine tests for certain test items, and these differences have been identified in this section Function of testing report:1. Project bidding: Issue authoritative third-party CMA/CNAS qualification report 2. Online e-commerce platform entry: Quality inspection report recognized by major e-commerce platforms 3. Used as a sales report: issuing legally effective testing reports to make consumers more confident 4. Papers and research: Provide professional personalized testing needs 5. Judicial services: providing scientific, fair, and accurate testing data 6. Industrial problem diagnosis: Verify the troubleshooting and correction of industrial production problems100% inspection and testing process:1. Telephone communication and confirmation of requirements 2. Recommend solutions and confirm quotations 3. Mail samples and arrange testing 4. Progress tracking and result feedback 5. Provide reports and after-sales service 6. If urgent or priority processing is requiredTesting and testing characteristics:1. The testing industry is fully covered, meeting different testing needs 2. Fully cover the laboratory and allocate localized testing nearby3. Engineers provide one-on-one services to make testing more accurate 4. Free initial testing, with no testing fees charged 5. Self service order delivery for free on-site sampling 6. Short cycle, low cost, and attentive service 7. Possess authoritative qualifications such as CMA, CNAS, CAL, etc 8. The testing report is authoritative and effective, and is generally used in China
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