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GB/T 14522-2008 English PDF (GBT14522-2008)

GB/T 14522-2008 English PDF (GBT14522-2008)

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GB/T 14522-2008: Artificial weathering test method for plastics, coating and rubber materials used for machinery industrial products -- Fluorescent UV lamps
GB/T 14522-2008
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 19.040
A 21
Replacing GB/T 14522-1993
Artificial weathering test method for plastics, coating
and rubber materials used for machinery industrial
products - Fluorescent UV lamps
ISSUED ON. JUNE 16, 2008
IMPLEMENTED ON. MARCH 01, 2009
Issued by. General Administration of Quality Supervision, Inspection and
Quarantine;
Standardization Administration of PRC.
Table of Contents
Foreword ... 3 
1 Scope ... 5 
2 Normative references ... 5 
3 Terms and definitions ... 5 
4 Principles ... 7 
5 Equipment ... 8 
6 Specimen ... 11 
7 Test conditions and test time ... 12 
8 Procedures ... 13 
9 Accuracy and deviation ... 14 
10 Test report ... 15 
Appendix A (Normative) Method for determining relative spectral power
distribution of fluorescent UV lamps ... 17 
Appendix B (informative) Excerpt from Table 4 of CIE Publication No.85.1989
... 19 
Appendix C (Informative) Example of typical test conditions ... 20 
References ... 21 
Artificial weathering test method for plastics, coating
and rubber materials used for machinery industrial
products - Fluorescent UV lamps
1 Scope
This standard specifies one of the artificial weathering test methods for plastics,
coating and rubber materials used for machinery industrial products -
fluorescent UV lamps exposure test method.
This standard applies to the weathering resistance comparison and screening
test of plastics, coating and rubber materials.
2 Normative references
The provisions in following documents become the provisions of this standard
through reference in this standard. For the dated references, the subsequent
amendments (excluding corrections) or revisions do not apply to this standard;
however, parties who reach an agreement based on this standard are
encouraged to study if the latest versions of these documents are applicable.
For undated references, the latest edition of the referenced document applies.
GB/T 16422.1 Plastics - Methods of the exposure to laboratory light sources
- Part 1. General guidance (GB/T 16422.1-2006, ISO 4892.1.1999, IDT)
GB/T 9271 Paints and varnishes - Standard panels for testing (GB/T 9271-
1988, eqv ISO 1514.1984)
GB/T 13452.2 Paints and varnishes - Determination of film thickness (GB/T
13452.2-1992, idt ISO 2808.1974)
GB/T 7762 Rubber, vulcanized or thermoplastic - Resistance to ozone
cracking - Static strain test (GB/T 7762-2003, ISO 1431-1.1989, MOD)
GB/T 2941 Rubber - General procedures for preparing and conditioning test
pieces for physical test methods (GB/T 2941-2006, ISO 23529.2004, IDT)
3 Terms and definitions
The following terms and definitions apply to this standard.
specimen;
b) Comparison of the performance values of the specimen and the file
specimen after exposure;
c) Comparison of the performance values of the specimen after exposure
and the control which is exposed at the same time.
4.6 Unless the reproducibility of the test results of the test materials between
different equipment has been determined, the results of the exposure tests on
the different machines of same model are not suitable for comparison.
4.7 Unless the correlation of the test results of the test materials between
different equipment has been determined, the results of the exposure tests on
the machines of different models are not suitable for comparison.
5 Equipment
5.1 Light source
5.1.1 This standard shall use fluorescent UV lamps. The radiation of fluorescent
UV lamps is mainly ultraviolet rays, wherein the radiation below 400 nm
accounts for more than 80% of the total radiation. This standard can use three
types of fluorescent UV lamps.
- UVA-340 fluorescent UV lamp. The relative spectral power distribution of
this type of lamp shall meet the requirements of Table 1. The radiation
below 300 nm is less than 2% of the total radiation, the peak value of the
radiant energy is at the wavelength of 340 nm. This type of lamp is generally
used to simulate the medium-and-short-wave ultraviolet rays in sunlight.
- UVA-351 fluorescent UV lamp. The relative spectral power distribution of
this type of lamp shall meet the requirements of Table 2. The radiation
below 300 nm accounts for less than 2% of the total radiation, the peak
value of the radiant energy is at the wavelength of 351 nm. This type of
lamp is generally used to simulate the short-and-medium-wave ultraviolet
rays in sunlight after passing through the glass.
- UVB-313 fluorescent UV lamp. The relative spectral power distribution of
this type of lamp shall meet the requirements of Table 3. The radiation
below 300 nm accounts for more than 10% of the total radiation, the peak
value of the radiant energy is at the wavelength of 313 nm.
5.1.4 It shall regularly clean the dirt and sediment on the lamp tube.
5.2 Test chamber
5.2.1 The test chamber may have a different design; but it shall be made of a
corrosion resistant material.
5.2.2 The test chamber shall contain fluorescent UV lamp and specimen holder.
The installation position of the fluorescent UV lamp and the specimen holder
shall ensure that the irradiance at the surface of the specimen is uniform and
meet the requirements of GB/T 16422.1.
5.2.3 The test chamber shall contain a black panel thermometer.
5.2.4 Where required, the test chamber shall also contain means for generating
saturated water vapor to form condensation, such as water trays and heaters.
5.2.5 When required, the test chamber shall also contain means for spraying
water onto the surface of the specimen.
5.3 Radiometer
It is recommended to use a radiometer to monitor the irradiance of the surface
of the specimen. If a radiometer is used, it shall comply with the requirements
of GB/T 16422.1.
5.4 Black panel thermometer
The temperature monitoring of the specimen generally adopts a black panel
thermometer, which shall meet the requirements of GB/T 16422.1.
The black panel thermometer shall be mounted on a specimen’s location so
that it is exposed to the same conditions as the specimen.
5.5 Moisture
5.5.1 Means of exposure to moisture
Specimens may be exposed to two forms of moisture. condensation or water-
spray.
5.5.2 Condensation
The test chamber may provide a means of forming condensation on the
exposed surface of the specimen. Typically, the saturated water vapor is
produced by heating water, then it forms condensation on the specimen.
5.5.3 Water-spray
The coated specimen is subjected to drying (or baking) and conditioning
according to the relevant standards or methods.
6.2.3 Thickness of coating
Use the non-destructive method as specified in GB/T 13452.2 to determine the
thickness of the dried coating, in micrometers.
6.2.4 Number of specimens
For each type of coating, it shall use the appropriate number of specimens for
testing on the same test equipment, generally not less than 3.
If necessary, it shall also prepare at least one file specimen for each coating,
meanwhile store it at room temperature to avoid moisture and light.
6.3 Rubber
The requirements for specimens in GB/T 16422.1 are applicable to rubber.
For tests under stress conditions, prepare the specimen according to the
requirements of GB/T 7762.
Condition the specimen according to the requirements of GB/T 2941.
6.4 Use of control specimen
It is recommended that a control specimen and the specim...
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