Standard No.:	GB/T 7752-2025
English Name:	Test method for dielectric strength and voltage withstand of insulating adhesive tape at power frequency
Chinese Name:	绝缘胶粘带工频介电强度和耐电压的试验方法
Chinese Classification:	G38    Basic standards and general methods for adhesives
Professional Classification:	GB    National Standard
Source Content Issued by:	SAMR; SAC
Issued on:	2025-8-29
Implemented on:	2026-3-1
Status:	to be valid
Superseding:	GB/T 7752-1987
Target Language:	English
File Format:	PDF
Word Count:	9000 words
Translation Price(USD):	270.0
Delivery:	via email in 1~3 business day

GB/T 7752-2025 Test method for dielectric strength and voltage withstand of insulating adhesive tape at power frequency English, Anglais, Englisch, Inglés, えいご This is a draft translation for reference among interesting stakeholders. The finalized translation (passing through draft translation, self-check, revision and verification) will be delivered upon being ordered. ICS 83.180 CCS G 38 People's Republic of China National Standard GB/T 7752-2025 Replaces GB/T 7752-1987 Test Method for Dielectric Strength and Voltage Withstand of Insulating Adhesive Tape at Power Frequency Issued on 2025-08-29 Implemented on 2026-03-01 Issued by State Administration for Market Regulation Standardization Administration of China Contents Foreword 1 Scope 2 Normative References 3 Terms and Definitions 4 Principle 5 Apparatus and Equipment 5.1 Thickness Gauge 5.2 Electrode Assembly 5.3 Power Supply 6 Samples and Test Specimens 6.1 Conditioning 6.2 Sample Selection 6.3 Specimen Dimensions and Quantity 7 Test Procedure 7.1 Standard Test Conditions 7.2 Thickness Measurement 7.3 Specimen Installation 7.4 Voltage Ramp Method 7.5 Breakdown Judgment 7.6 Voltage Measurement 7.7 Voltage Withstand Test 8 Test Results 8.1 Dielectric Strength 8.2 Voltage Withstand 9 Test Report Test Method for Dielectric Strength and Voltage Withstand of Insulating Adhesive Tape at Power Frequency 1 Scope This document specifies the test method for determining the dielectric strength and voltage withstand of insulating adhesive tape at power frequency. This document applies to the measurement and evaluation of dielectric strength and voltage withstand of insulating adhesive tape. 2 Normative References The following referenced documents contain provisions which, through citation in the text, constitute provisions of this document. For dated references, only the edition cited applies. For undated references, the latest edition (including any amendments) applies. GB/T 7125 Test Method for Thickness of Pressure-Sensitive Tapes GB/T 22396 Terminology for Pressure-Sensitive Products 3 Terms and Definitions Terms and definitions established in GB/T 22396 and the following apply to this document. 3.1 Insulating Adhesive Tape Pressure-sensitive tape used in electrical applications with excellent insulation properties to prevent leakage. 3.2 Power Frequency The rated frequency adopted by power system generation, transmission, substation, and distribution equipment, as well as industrial and household electrical equipment. Note 1: Unit is hertz (Hz). Note 2: The standard frequency for China's power industry is 50 Hz, while some countries (e.g., the United States) use 60 Hz. 3.3 Breakdown A phenomenon where the insulating adhesive tape undergoes intense discharge or becomes conductive under an electric field, resulting in damage and perforation. 3.4 Breakdown Voltage The voltage at which breakdown occurs when a continuous or stepwise increasing voltage is applied along the thickness direction of the insulating adhesive tape under specified conditions. Note: Unit is volt (V). [Source: GB/T 22396—2008, 8.21, modified] 3.5 Dielectric Strength (Electric Strength) The ratio of the breakdown voltage of the insulating adhesive tape to its thickness. Note: Unit is volt per meter (V/m). [Source: GB/T 22396—2008, 8.22, modified] 3.6 Voltage Withstand (Voltage Resistant) The voltage value that the insulating adhesive tape can withstand without breakdown for a specified time. Note: Unit is volt (V). [Source: GB/T 22396—2008, 8.20, modified] 3.7 Flashover Abnormal direct discharge between high-voltage and low-voltage electrodes. 4 Principle The test applies power frequency voltage to the insulating adhesive tape specimen using different voltage ramp methods until breakdown occurs. The breakdown voltage is measured, and the dielectric strength at power frequency is obtained by dividing the breakdown voltage by the specimen thickness. The voltage is rapidly increased to a specified value and maintained for a period. If the specimen does not breakdown, this voltage value is recorded as the voltage withstand of the insulating adhesive tape.