GB/T 37382-2019 English PDF (GBT37382-2019)

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GB/T 37382-2019: Optical functional films -- Films for backlight unit of liquid crystal display -- High temperature and high humidity aging measurement
GB/T 37382-2019
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 71.080.99
G 15
Optical functional films - Films for backlight unit of
liquid crystal display - High temperature and high
humidity aging measurement
ISSUED ON: MARCH 25, 2019
IMPLEMENTED ON: FEBRUARY 01, 2020
Issued by: State Administration for Market Regulation;
Standardization Administration of the People's Republic of
China.
Table of Contents
Foreword ... 3 
1 Scope ... 4 
2 Normative references ... 4 
3 Devices ... 4 
4 Specimen ... 5 
5 Test environment ... 5 
6 Test steps ... 5 
7 Result expression ... 7 
8 Test report ... 7 
Optical functional films - Films for backlight unit of
liquid crystal display - High temperature and high
humidity aging measurement
1 Scope
This Standard specifies the measurement method of high temperature and high
humidity aging of optical functional films for backlight unit of liquid crystal display.
This Standard is applicable to the measurement of high temperature and high
humidity aging of optical functional films for backlight unit of liquid crystal display.
2 Normative references
The following referenced documents are indispensable for the application of
this document. For dated references, only the edition cited applies. For undated
references, the latest edition of the referenced document (including any
amendments) applies.
GB/T 2410, Determination of the luminous transmittance and haze of
transparent plastics
GB/T 6739, Paints and varnishes - Determination of film hardness by pencil
test
GB/T 9286, Paints and varnishes - Cross cut test for films
GB/T 25257, Optical functional films - Determination of warping degree
HG/T 4915, White reflective films - Determination of reflectance
3 Devices
3.1 Constant temperature and humidity aging box
Meet: maximum temperature ≥65°C, maximum relative humidity ≥95%, and
continuous operation for more than 500h.
Temperature accuracy: ±0.5°C.
2 - Specimen.
Figure 1 -- Specimen clamping diagram
6.5 Aging test
Set the constant temperature and humidity aging box as: testing temperature is
65°C and the relative testing humidity is 95%. When the set temperature and
humidity are reached, put the specimen into the box. Conduct the 500h aging
test to Group A3, Group A4, Group A5, Group A6, Group B1 and Group B2
specimens obtained according to 6.4. It must not interrupt during the test
process.
6.6 Specimen balance after aging
After the test ends, place Group A3, Group A4, Group A5, Group A6, Group B1
and Group B2 specimens obtained according to 6.5 on the platform. Treat them
according to the provisions of Clause 5.
6.7 Performance testing after aging
Respectively test adhesion, hardness, light transmittance, haze and warpage
to post-test specimens of Group A3, Group A4, Group A5 and Group A6
obtained according to 6.6. Respectively test warpage and reflectivity to post-
test specimens of Group B1 and Group B2.
In addition, the testing areas of specimen adhesion, hardness, light
transmittance, haze and reflectance shall be beyond by 5mm or more around
the edges and the clamping area.
7 Result expression
Compare with the testing results of Group A1, Group A2, Group A5, Group A6,
Group B1 and Group B2 specimens before aging test, record, compare,
calculate and analyze each performance parameter of Group A3, Group A4,
Group A5, Group A6, Group B1 and Group B2 specimens after aging test. And
determine the results.
8 Test report
The test report shall contain the following information:
a) reference to this Standard;
b) detailed instructions required to identify specimen, such as specimen