GB/T 14522-2008 PDF English
US$155.00 · In stock · Download in 9 secondsGB/T 14522-2008: Artificial weathering test method for plastics, coating and rubber materials used for machinery industrial products - Fluorescent UV lamps Delivery: 9 seconds. True-PDF full-copy in English & invoice will be downloaded + auto-delivered via email. See step-by-step procedureStatus: Valid GB/T 14522: Evolution and historical versions
| Standard ID | Contents [version] | USD | STEP2 | [PDF] delivery | Name of Chinese Standard | Status |
| GB/T 14522-2008 | English | 155 |
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Artificial weathering test method for plastics, coating and rubber materials used for machinery industrial products - Fluorescent UV lamps
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| GB/T 14522-1993 | English | 279 |
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Accelerated weathering test method for plastics, coatings and rubber materials used for machinery industrial products
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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
---This is an excerpt. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.), auto-downloaded/delivered in 9 seconds, can be purchased online: https://www.ChineseStandard.net/PDF.aspx/GBT14522-2008
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
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.
3.1
File specimen
Some of the test materials which are stored in a stable condition to compare
the changes in performance before and after exposure.
3.2
Control
A material which has a similar composition and structure to the test material,
for comparing the performance of the test material after simultaneous
exposure.
3.3
Control specimen
A portion of the control which is used for exposure.
3.4
Irradiance
The radiant energy in a band of a certain wavelength or a certain wavelength
passband as illuminated per unit time and unit area, in W/m2.
3.5
Radiant exposure
The time integral of the irradiance, in J/m2.
3.6
Spectral power distribution
The absolute or relative radiant energy which is emitted by a light source or
received by an object, which is a function of wavelength.
4 Principles
4.1 The radiation from a fluorescent UV lamp is used to simulate the ultraviolet
radiation in sunlight.
4.2 The specimen is exposed to a regularly repeated light and humid
environment or a continuous light environment, meanwhile the light and
humidity are under controlled conditions, the specimen is exposed to the
specified test time.
4.3 There are two common ways to provide moisture.
4.4 Exposure conditions can be varied by selecting the different options below
or by setting different values (if applicable).
4.5 Use the following methods to obtain the results of the exposure test.
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.
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.
5.1.2 In the test, it generally uses the same type of fluorescent UV lamp. It is
recommended not to mix using different types of fluorescent UV lamps.
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.
5.3 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.
5.5.3 Water-spray
The test chamber may be equipped with a water-spray device to intermittently
and uniformly spray water to the specimen.
5.6 Specimen holder
The specimen holder shall be made of corrosion-resistant materials that do not
affect the test results. When the equipment provides a means of condensation,
the design of the specimen holder shall ensure that, after the specimen is
installed, there is sufficient free air to cool the backside of the specimen, thereby
producing condensation on the exposed surface of the specimen.
6 Specimen
6.1 Plastics
See GB/T 16422.1.
6.2 Coatings
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 specimen be exposed
simultaneously, to provide comparative criteria.
7 Test conditions and test time
7.1 Test conditions
Within the capabilities of the equipment, it may use any test conditions. The test
conditions are usually for one exposure cycle, including the number of exposure
interval, the order of exposure interval, the duration of each exposure interval,
the conditions of each exposure interval that make up the exposure cycle.
7.2 Test time
The test time is usually determined by the following methods.
8 Procedures
8.1 It shall identify each specimen. The identifier shall be located in the non-
detection area of the specimen, it shall not easily disappear or fade.
8.2 Determine which properties of the specimen need to be tested, for example,
color, gloss, chalking, cracking and other appearance properties, tensile
strength, elongation at break, bending strength and other mechanical properties,
which shall be tested according to relevant standards or specifications, before
exposing the specimen. If required, for example, a destructive test, use a file
specimen for performance testing.
8.3 Install the specimen on the specimen holder of the equipment. The
specimen shall not be subjected to additional stress.
8.4 According to the selected setting procedure for test conditions, perform the
test until reaching to the required test time.
8.5 Change of specimen’s position.
8.6 If intermediate testing is required, it should be carried out at the end of the
dry exposure period. When handling the specimen, be careful not to touch or
damage the tested surface of the specimen.
8.7 Test equipment requires regular maintenance to maintain consistency of
test conditions.
8.8 After the exposure is over, conduct the performance tests according to
relevant standards or specifications.
9 Accuracy and deviation
9.1 Accuracy
9.1.3 If a standard or specification is used for two or three parties, and a specific
performance value is required after exposure test for a specific time or radiant
exposure according to this standard, then, the value shall be based on a
statistical analysis of the results as obtained from at least two independent,
unrelated exposure tests in each laboratory.
9.1.4 When the reproducibility of the results of an exposure test according to
this standard has not been determined by a joint test, the performance
requirements of the material shall be specified by comparison (thus by grading)
with a control.
9.2 Deviation
Because there is no universally recognized standard material for weathering, it
cannot determine the deviation.
......
Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al.
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