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GB/T 5137.4-2020 English PDF (GBT5137.4-2020)

GB/T 5137.4-2020 English PDF (GBT5137.4-2020)

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GB/T 5137.4-2020: Test methods of safety glazing materials used on road vehicles -- Part 4: Determination of solar characteristic
This Part of GB/T 5137 specifies the method for determination of solar characteristic of safety glazing materials used on road vehicles, including solar ultraviolet transmittance, solar direct transmittance, solar direct reflectance, solar direct absorptance, solar infrared direct transmittance, solar infrared direct reflectance, solar infrared direct absorptance, total solar energy transmittance, total solar infrared thermal energy transmittance.
GB/T 5137.4-2020
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 43.040.60
T 34
Replacing GB/T 5137.4-2001
Test methods of safety glazing materials used on road
vehicles - Part 4: Determination of solar characteristic
(ISO 13837:2008, Road vehicles - Safety glazing materials -
Method for the determination of solar transmittance, MOD)
ISSUED ON: MARCH 31, 2020
IMPLEMENTED ON: FEBRUARY 01, 2021
Issued by: State Administration for Market Regulation;
Standardization Administration of the PRC.
Table of Contents
Foreword ... 3
1 Scope ... 5
2 Normative references ... 5
3 Terms and definitions ... 5
4 Environmental conditions ... 6
5 Test apparatus ... 6
6 Sample ... 6
7 Test procedure ... 6
8 Data processing ... 6
9 Expression of results ... 14
Annex A (Informative) Structural changes of this Part compared with ISO 13837:2008 ... 15
Annex B (Informative) Technical differences between this Part and ISO
13837:2008 and their causes ... 16
Bibliography ... 18
Foreword
GB/T 5137 "Test methods of safety glazing materials used on road vehicles" is divided into 5 parts:
- Part 1: Mechanical properties tests;
- Part 2: Optical properties tests;
- Part 3: Radiation, high temperature, humidity, fire and simulated weathering resistance tests;
- Part 4: Determination of solar characteristic;
- Part 5: Resistant-to-chemical and resistant-to-temperature changes test. This Part is Part 4 of GB/T 5137.
This Part is drafted in accordance with the rules given in GB/T 1.1-2009. This Part replaces GB/T 5137.4-2001 "Road vehicles - Safety glazing materials - Method for the determination of solar transmittance". Compared with GB/T 5137.4-2001, in addition to editorial changes, the main technical changes of this Part are as follows:
- Modify the scope (see Clause 1; Clause 1 of the 2001 edition);
- Modify "Reference standards" to "Normative references"; ADD new
references (see Clause 2; Clause 2 of the 2001 edition);
- Delete some definitions in the previous standard (see Clause 3; Clause 3 of the 2001 edition);
- ADD requirements for environmental conditions (see Clause 4);
- Delete "Calculation convention B" in the previous standard (see 4.4.2 of the 2001 edition);
- ADD the calculation method of solar ultraviolet transmittance when the air mass is 1.5 (see 8.1);
- ADD the calculation method of solar infrared direct transmittance (see 8.6); - ADD the calculation method of solar infrared direct reflectance (see 8.7); - ADD the calculation method of solar infrared direct absorptance (see 8.8); - ADD the calculation method of total solar infrared thermal energy
Test methods of safety glazing materials used on road
vehicles - Part 4: Determination of solar characteristic
1 Scope
This Part of GB/T 5137 specifies the method for determination of solar
characteristic of safety glazing materials used on road vehicles, including solar ultraviolet transmittance, solar direct transmittance, solar direct reflectance, solar direct absorptance, solar infrared direct transmittance, solar infrared direct reflectance, solar infrared direct absorptance, total solar energy transmittance, total solar infrared thermal energy transmittance.
This Part applies to the determination of solar characteristic of safety glazing materials used on road vehicles.
2 Normative references
The following documents are indispensable for the application of this document. For the dated references, only the editions with the dates indicated are applicable to this document. For the undated references, the latest edition (including all the amendments) are applicable to this document.
GB/T 2680 Determination of light transmittance, solar direct transmittance, total solar energy transmittance and ultraviolet transmittance for glass in building and related glazing factors (GB/T 2680-1994, ISO 9050:1990, NEQ) QC/T 1119 Road vehicles - Glazing materials - Terminology (QC/T 1119-
2019, ISO 3536:2016, MOD)
EN 673 Glass in building - Determination of thermal transmittance (U value) - Calculation method
3 Terms and definitions
The terms and definitions defined in QC/T 1119 and the following ones apply to this document.
3.1
Transmittance
The ratio of the radiant flux transmitted through the safety glazing material to the incident radiant flux under specific geometric and spectral conditions. 4 Environmental conditions
Unless otherwise specified, the test shall be conducted under the following environmental conditions:
a) Ambient temperature: 20 °C±5 °C;
b) Atmospheric pressure: 8.60×104 Pa~1.06×105 Pa;
c) Relative humidity: 30%~60%.
5 Test apparatus
A spectrophotometer with integrating sphere. The range wavelength shall include at least 300 nm~2500 nm.
6 Sample
Flat test pieces; or it is possible to cut the flattest part of curved products. 7 Test procedure
According to requirements of the equipment manufacturer, calibrate the
instrument. PUT in a clean sample. The sample is perpendicular to the incident beam. A single piece of glass can be directly tested as a sample. Insulating glass sample shall be split into single pieces for testing. During the test, the sample shall be kept clean. If applicable, it shall mark the direction of the film surface or curved surface of the sample; record the spectral transmittance and spectral reflectance values of the sample.
8 Data processing
8.1 The solar ultraviolet transmittance TUV(380) is calculated according to formula (1).
Where:
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