2025-6-19 18.97.14.83
Code of China Chinese Classification Professional Classification ICS Classification Latest News Value-added Services

Position: Chinese Standard in English/GB 3399-1982
GB 3399-1982   Test method for thermal conductivity of plastics by means of the guarded hot plate (English Version)
Standard No.: GB 3399-1982 Status:valid remind me the status change

Email:

Language:English File Format:PDF
Word Count: 2000 words Price(USD):60.0 remind me the price change

Email:

Implemented on:1983-10-1 Delivery: via email in 1 business day
,,
Standard No.: GB 3399-1982
English Name: Test method for thermal conductivity of plastics by means of the guarded hot plate
Chinese Name: 塑料导热系数试验方法 护热平板法
Chinese Classification: G31    Basic standards and general methods for synthetic resin and plastic
Professional Classification: GB    National Standard
Issued by: National Bureau of Standards
Issued on: 1982-01-02
Implemented on: 1983-10-1
Status: valid
Superseding:HG 2-158-1965
Language: English
File Format: PDF
Word Count: 2000 words
Price(USD): 60.0
Delivery: via email in 1 business day
Codeofchina.com is in charge of this English translation. In case of any doubt about the English translation, the Chinese original shall be considered authoritative. Test method for thermal conductivity of plastics by means of the guarded hot plate This standard is applicable to measurement of thermal conductivity of plastics by means of guarded hot plate (steady-state method), and is not applicable to measurement of plastics with a thermal conductivity greater than 2.20W/(m·K). 1 Definitions 1.1 thermal flux Φ heat passing through a certain surface per unit time, in W 1.2 thermal flux density q heat passing through unit area of a certain surface per unit time, in W/m2 1.3 thermal conductivity λ heat passing through unit area per unit temperature gradient perpendicular to unit area under stable conditions, in W/(m·K) 2 Principle 2.1 This method is based on the principle of unidirectional steady heat conduction. Measure the heat passing through the effective heat transfer area of the test specimen, the temperature difference between the upper and lower surfaces of the test specimen, as well as the thicknesses of them when they are exposed to different stable temperatures, and then calculate the thermal conductivity accordingly. 3 Test specimen 3.1 The test specimen shall be homogeneous hard material, and the two surfaces of it shall be flat, smooth and parallel with each other and free of defects such as cracks. For flat test specimens, the unevenness shall be within 0.5mm/m. In case of soft materials or granules, a wooden frame is necessary, and the test specimen shall be homogeneous in general. 3.2 The test specimen shall be a representative part of the product and shall be taken directly from the product or prepared in accordance with the product standard. 3.2.1 In case of testing a specimen with a double-plate thermal conductivity meter, the same specimen shall be selected where possible. 3.3 The test specimen shall be round or square, and its diameter or side length shall be equal to that of the guarded hot plate, and its thickness shall not be less than 5 mm. The maximum thickness of it shall be determined according to the meter but shall not exceed 1/8 of its diameter or side length. 3.4 Before testing, the test specimen shall be conditioned according to the requirements of the product standard. If no product standard is available, the test specimen shall be treated for 24 h under the conditions specified in GB 2918-82 Plastics - Standard atmospheres for conditioning and testing. 3.5 The number of test specimen of each group shall not be less than 2. 4 Test conditions 4.1 Test environment: the test shall be conducted under the normal temperature and humidity specified in GB 2918-82. 4.2 Test conditions Temperature of hot plate: below 333 K. Temperature of cold plate: room temperature or required temperature. The temperature difference between the cold plate and the hot plate shall not be less than 10 K, and the temperature gradient through the test specimen shall be between 400 K/m and 2,000 K/m. Note: If no dew prevention measure is available, the temperature of the cold plate shall be at least 5 K higher than the dew-point temperature of the environment. 5 Test apparatus For the purpose of this method, the apparatus required shall be a plane table thermo-conductivity meter with a guarded hot plate. It consists of a heating plate (including a main heating plate and a protective heating plate), a cold plate, a temperature measuring instrument and a calorimeter. 5.1 Heating plate: the diameter of the main heating plate shall be at least 100mm, and the minimum width of the protective heating plate shall be at least 1/4 of the side length or diameter of the heating plate. A gap of appropriate dimension shall be reserved between the main heating plate and the protective heating plate, and the flat area of the gap shall not be 8% greater than the area of the main heating plate. The heating plate shall be flat and smooth. And its surface unevenness shall be within 0.25mm/m. The temperature of it shall be uniform, and the temperature fluctuation of the main heating plate shall not be greater than 2% of the temperature difference between the two sides of the test specimen, and 5% for the protective heating plate. There shall be an average temperature balance detector between the main and protective heating plates. 5.2 Cold plate: it shall have the same dimension as the heating plate and subject to the same requirements for unevenness. 5.3 The hot plate and cold plate shall have a radiation coefficient greater than 0.8. 5.4 Temperature measuring instrument: measure the temperature on both surfaces of the test specimen with a thermocouple with a thermocouple wire diameter less than 0.2mm, accurate to not less than 0.1 K. 5.5 Calorimeter: measure the heat passing through the test specimen, accurate to 1%. 5.6 Heating power: the fluctuation of the heating voltage shall not exceed ± 0.5%.
1 Definitions 2 Principle 3 Test specimen 4 Test conditions 5 Test apparatus 6 Test procedure 7 Test result 8 Test report Additional explanation:
Referred in GB 3399-1982:
*GB/T 22199.1-2017 Valve-regulated lead-acid batteries for moped―Part 1:Technical conditions
*HJ 75-2017 Specifications for continuous emissions monitoring of SO2, NOX, and particulate matter in the flue gas emitted from stationary sources
*HJ 38-2017 Stationary source emission - Determination of total hydrocarbons,methane and nonmethane hydrocarbons - Gas chromatography
*GB/T 16157-1996/XG1-2017 The determination of particulates and sampling methods of gaseous pollutants emitted from exhaust gas of stationary source, including Amendment 1
*GB/T 17048-2017 Hard-drawn aluminium wire for overhead line conductors
*GB/T 4437.2-2017 Aluminium and aluminium alloy extruded tubes-Part 2:Seam tubes
*GB 34660-2017 Road vehicles —Requirements and test methods of electromagnetic compatibility
*GB/T 50393-2017 Technical standard for anti一corrosion engineering of steel petroleum storage tanks
*GB/T 15102-2017 Surface decorated fiberboard and particleboard withpaper impregnated thermosetting resins
*GB/T 17213.7-2017 Industrial-process control valves—Part 7: Control valve data sheet
*DL/T 1606-2016 Gas turbine-ezhaust gas emission: measurement and evaluation
GB 3399-1982 is referred in:
*GB/T 21910-2017 Method for measuring relative wet grip performance of passenger car tyres
Code of China
Standard
GB 3399-1982  Test method for thermal conductivity of plastics by means of the guarded hot plate (English Version)
Standard No.GB 3399-1982
Statusvalid
LanguageEnglish
File FormatPDF
Word Count2000 words
Price(USD)60.0
Implemented on1983-10-1
Deliveryvia email in 1 business day
Detail of GB 3399-1982
Standard No.
GB 3399-1982
English Name
Test method for thermal conductivity of plastics by means of the guarded hot plate
Chinese Name
塑料导热系数试验方法 护热平板法
Chinese Classification
G31
Professional Classification
GB
ICS Classification
Issued by
National Bureau of Standards
Issued on
1982-01-02
Implemented on
1983-10-1
Status
valid
Superseded by
Superseded on
Abolished on
Superseding
HG 2-158-1965
Language
English
File Format
PDF
Word Count
2000 words
Price(USD)
60.0
Keywords
GB 3399-1982, GB/T 3399-1982, GBT 3399-1982, GB3399-1982, GB 3399, GB3399, GB/T3399-1982, GB/T 3399, GB/T3399, GBT3399-1982, GBT 3399, GBT3399
Introduction of GB 3399-1982
Codeofchina.com is in charge of this English translation. In case of any doubt about the English translation, the Chinese original shall be considered authoritative. Test method for thermal conductivity of plastics by means of the guarded hot plate This standard is applicable to measurement of thermal conductivity of plastics by means of guarded hot plate (steady-state method), and is not applicable to measurement of plastics with a thermal conductivity greater than 2.20W/(m·K). 1 Definitions 1.1 thermal flux Φ heat passing through a certain surface per unit time, in W 1.2 thermal flux density q heat passing through unit area of a certain surface per unit time, in W/m2 1.3 thermal conductivity λ heat passing through unit area per unit temperature gradient perpendicular to unit area under stable conditions, in W/(m·K) 2 Principle 2.1 This method is based on the principle of unidirectional steady heat conduction. Measure the heat passing through the effective heat transfer area of the test specimen, the temperature difference between the upper and lower surfaces of the test specimen, as well as the thicknesses of them when they are exposed to different stable temperatures, and then calculate the thermal conductivity accordingly. 3 Test specimen 3.1 The test specimen shall be homogeneous hard material, and the two surfaces of it shall be flat, smooth and parallel with each other and free of defects such as cracks. For flat test specimens, the unevenness shall be within 0.5mm/m. In case of soft materials or granules, a wooden frame is necessary, and the test specimen shall be homogeneous in general. 3.2 The test specimen shall be a representative part of the product and shall be taken directly from the product or prepared in accordance with the product standard. 3.2.1 In case of testing a specimen with a double-plate thermal conductivity meter, the same specimen shall be selected where possible. 3.3 The test specimen shall be round or square, and its diameter or side length shall be equal to that of the guarded hot plate, and its thickness shall not be less than 5 mm. The maximum thickness of it shall be determined according to the meter but shall not exceed 1/8 of its diameter or side length. 3.4 Before testing, the test specimen shall be conditioned according to the requirements of the product standard. If no product standard is available, the test specimen shall be treated for 24 h under the conditions specified in GB 2918-82 Plastics - Standard atmospheres for conditioning and testing. 3.5 The number of test specimen of each group shall not be less than 2. 4 Test conditions 4.1 Test environment: the test shall be conducted under the normal temperature and humidity specified in GB 2918-82. 4.2 Test conditions Temperature of hot plate: below 333 K. Temperature of cold plate: room temperature or required temperature. The temperature difference between the cold plate and the hot plate shall not be less than 10 K, and the temperature gradient through the test specimen shall be between 400 K/m and 2,000 K/m. Note: If no dew prevention measure is available, the temperature of the cold plate shall be at least 5 K higher than the dew-point temperature of the environment. 5 Test apparatus For the purpose of this method, the apparatus required shall be a plane table thermo-conductivity meter with a guarded hot plate. It consists of a heating plate (including a main heating plate and a protective heating plate), a cold plate, a temperature measuring instrument and a calorimeter. 5.1 Heating plate: the diameter of the main heating plate shall be at least 100mm, and the minimum width of the protective heating plate shall be at least 1/4 of the side length or diameter of the heating plate. A gap of appropriate dimension shall be reserved between the main heating plate and the protective heating plate, and the flat area of the gap shall not be 8% greater than the area of the main heating plate. The heating plate shall be flat and smooth. And its surface unevenness shall be within 0.25mm/m. The temperature of it shall be uniform, and the temperature fluctuation of the main heating plate shall not be greater than 2% of the temperature difference between the two sides of the test specimen, and 5% for the protective heating plate. There shall be an average temperature balance detector between the main and protective heating plates. 5.2 Cold plate: it shall have the same dimension as the heating plate and subject to the same requirements for unevenness. 5.3 The hot plate and cold plate shall have a radiation coefficient greater than 0.8. 5.4 Temperature measuring instrument: measure the temperature on both surfaces of the test specimen with a thermocouple with a thermocouple wire diameter less than 0.2mm, accurate to not less than 0.1 K. 5.5 Calorimeter: measure the heat passing through the test specimen, accurate to 1%. 5.6 Heating power: the fluctuation of the heating voltage shall not exceed ± 0.5%.
Contents of GB 3399-1982
1 Definitions 2 Principle 3 Test specimen 4 Test conditions 5 Test apparatus 6 Test procedure 7 Test result 8 Test report Additional explanation:
About Us   |    Contact Us   |    Terms of Service   |    Privacy   |    Cancellation & Refund Policy   |    Payment
Tel: +86-10-8572 5655 | Fax: +86-10-8581 9515 | Email: coc@codeofchina.com | QQ: 672269886
Copyright: TransForyou Co., Ltd. 2008-2040
 
 
Keywords:
GB 3399-1982, GB/T 3399-1982, GBT 3399-1982, GB3399-1982, GB 3399, GB3399, GB/T3399-1982, GB/T 3399, GB/T3399, GBT3399-1982, GBT 3399, GBT3399