GB/T 18244-2022 PDF English
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| Standard ID | Contents [version] | USD | STEP2 | [PDF] delivery | Name of Chinese Standard | Status |
| GB/T 18244-2022 | English | 215 |
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Test methods for weathering resistance of building waterproof materials
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| GB/T 18244-2000 | English | 135 |
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Test methods for resistance to weathering of building water proofing materials
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GB/T 18244-2022: Test methods for weathering resistance of building waterproof materials---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/GBT18244-2022
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 91.120.30
CCS Q 17
Replacing GB/T 18244-2000
Test Methods for Weathering Resistance of Building
Waterproof Materials
Issued on. JULY 11, 2022
Implemented on. FEBRUARY 01, 2023
Issued by. State Administration for Market Regulation;
Standardization Administration of the People’s Republic of China.
Table of Contents
Foreword... 3
1 Scope... 5
2 Normative References... 5
3 Terms and Definitions... 5
4 General Provisions... 6
4.1 Laboratory maintenance conditions... 6
4.2 Preparation of specimen... 6
4.3 Calculation of retention rate and change rate results... 7
5 Hot Air Aging... 8
5.1 Overview... 8
5.2 Test device... 8
5.3 Test conditions... 8
5.4 Test procedures... 9
5.5 Test report... 9
6 Artificial Accelerated Weathering - Xenon Arc Lamp... 10
6.1 Overview... 10
6.2 Principle... 10
6.3 General... 11
6.4 Significance... 11
6.5 Application of laboratory light source accelerated weathering test... 12
6.6 Test device... 13
6.7 Exposure conditions... 13
6.8 Test procedures... 15
6.9 Test report... 16
7 Artificial Accelerates Weathering - Fluorescent UV Lamps... 17
7.1 Overview... 17
7.2 Principle... 17
7.3 General... 18
7.4 Significance... 18
7.5 Application of laboratory light source accelerated aging test... 18
7.6 Test device... 18
7.7 Exposure conditions... 19
7.8 Test procedures... 20
7.9 Test report... 21
1 Scope
This Document specifies the test methods of general provisions, hot air aging, artificial
accelerated weathering - xenon arc lamp and artificial accelerated weathering-fluorescent UV
lamp for the aging test of building waterproofing materials.
This Document is applicable to the determination of thermal aging and artificial accelerated
weathering properties of building waterproofing sheets and building waterproofing coatings.
2 Normative References
The provisions in following documents become the essential provisions of this Document
through reference in this Document. For the dated documents, only the versions with the dates
indicated are applicable to this Document; for the undated documents, only the latest version
(including all the amendments) is applicable to this Document.
GB/T 528 Rubber, Vulcanized or Thermoplastic - Determination of Tensile Stress-Strain
Properties
GB/T 11026.4 Electrical Insulating Materials - Thermal Endurance Properties - Part 4.
Ageing Ovens - Single-Chamber Ovens
GB/T 16422.1 Plastics - Methods of the Exposure to Laboratory Light Sources - Part 1.
General Guidance
GB/T 16422.2 Plastics - Methods of Exposure to Laboratory Light Sources - Part 2.
Xenon-Arc Sources
GB/T 16422.3 Plastics - Methods of Exposure to Laboratory Light Sources - Part 3.
Fluorescent UV Lamps
3 Terms and Definitions
For the purposes of this Document, the following terms and definitions apply.
3.1 Control
< Weathering> A material that has a similar composition and structure to the test material, and
whose properties are compared with the test material after exposure at the same time.
3.2 File specimen
A portion of the test material that was stored under stable conditions and used to compare
changes in properties before and after exposure.
4 General Provisions
WARNING. Appropriate safety precautions shall be taken during the test to avoid
damage caused by high temperature and ultraviolet radiation.
4.1 Laboratory maintenance conditions
Laboratory maintenance conditions. the temperature is (23 ± 2) ℃, and the relative humidity is
40%~60%.
4.2 Preparation of specimen
4.2.1 Evaluation items for the aging performance of building waterproof materials.
4.2.2 The number of groups of specimens for each test item. The specimens for parallel
comparison test shall be no less than 3 groups.
4.2.3 The preparation of specimen, specimen shape, size, and sampling method shall be carried
out in accordance with the relevant product standards.
4.2.4 The tensile properties test piece of homogeneous products should be made of dumbbell
type 1 test piece that meet the requirements of GB/T 528.For non-homogeneous specimens, it
should be straight-strip test piece with width of 25mm; and the length of the test piece shall
meet the requirements that the distance between the clamps of test pieces is 70mm.
4.2.5 The minimum size of the non-destructive test piece is 100mm×50mm. Each group of test
pieces shall be no less than 3; for destructive tests, each group of test pieces shall be no less
than 5.
4.3 Calculation of retention rate and change rate results
The performance retention rate after treatment is calculated according to Formula (1), accurate
to 1%.
5 Hot Air Aging
5.1 Overview
Expose the test material to an accelerated aging test chamber in a heat and oxygen environment,
and evaluate the heat-resistant air aging performance of the material by measuring the change
in the material properties before and after aging. A control of known properties should
preferably be exposed concurrently with the test material to provide a standard comparison.
5.3 Test conditions
5.3.1 Test temperature
Unless otherwise specified, the test temperature for asphalt-based waterproof materials should
be 70°C; and for polymer waterproof materials, 80°C should be used.
When the temperature does not exceed 100°C, the allowable temperature deviation is ±1°C;
when the temperature exceeds 100°C, the allowable temperature deviation is ±2°C.
5.4 Test procedures
5.4.1 Installation of test piece
Before the test, the test pieces need to be numbered, and the numbering method shall not affect
the material performance test.
5.4.2 Exposure
In order to reduce the influence of temperature inhomogeneity, the position of the test pieces
can be exchanged periodically.
5.4.3 Determination of performance after exposure
After the test is completed, the test piece shall be placed under the conditions specified in the
product standard for 24h; and then the relevant properties are measured.
5.5 Test report
The test report shall include the following contents.
6 Artificial Accelerated Weathering - Xenon Arc Lamp
6.1 Overview
This Clause describes a test method for simulating climatic effects (temperature, humidity,
and/or wetting) by exposing test pieces to a xenon arc lamp in a wet environment, which is used
to simulate the natural aging effect by exposing materials to sunlight in an actual use
environment.
6.2 Principle
6.2.1 A xenon arc lamp equipped with a filter is used to simulate the spectral distribution of the
ultraviolet region and the visible light region in sunlight.
6.2.4 Wetting conditions are achieved by spraying the test piece with deionized water,
immersing the test piece in water, or forming condensed water vapor on the surface of the
exposed test piece.
6.2.5 The test procedure includes the measurement of UV irradiance and UV radiation exposure
on the surface of the test piece.
6.3 General
The test pieces are subjected to laboratory light source exposure tests under controlled
environmental conditions.
6.4 Significance
6.4.1 When using a laboratory light source for exposure tests, it is very important to consider
the simulation of accelerated test conditions and the actual use environmental conditions of the
tested materials. When performing exposure tests and interpreting the results of artificial
accelerated weathering tests, the effect of differences between the accelerated test and actual
exposure shall be considered.
6.4.3 While it may seem tempting to have a "universal acceleration factor" relating "x" hours
or megajoules of radiation to actual exposure "y" months or years in artificially accelerated
weathering or artificially accelerated radiation exposure tests, it does not apply to all material.
There are several reasons why such acceleration factors are not applicable.
6.4.4 Many factors may reduce the correlation between accelerated testing of laboratory light
sources and outdoor exposure, such as.
6.5 Application of laboratory light source accelerated weathering test
6.5.2 In some specific tests, the evaluation of the performance of the test sample is carried out
after a specific exposure time or radiation dose under a set of test cycles of specified conditions.
Unless the reproducibility of the effect of a specific exposure cycle and the reproducibility of
the performance test method have been determined, the results of any accelerated exposure test
conducted in accordance with other parts of this Document cannot be jointly used with the
specific performance level achieved based on the specified exposure time or exposure to
determine if the material is acceptable.
6.6 Test device
The equipment shall comply with the provisions of GB/T 16422.2, and shall use a xenon arc
lamp test device with a daylight filter.
6.7 Exposure conditions
6.9 Test report
The test report shall include the following.
7 Artificial Accelerates Weathering - Fluorescent UV Lamps
7.1 Overview
This method specifies a test method for the exposure of test pieces to fluorescent ultraviolet
radiation, heat and water in a test chamber. This method is used to simulate the natural aging
effects of materials exposed to sunlight in an actual use environment.
7.2 Principle
7.2.1 Fluorescent UV lamps can be used to simulate the spectral irradiance in the UV region of
sunlight when maintained and/or operated in accordance with the supplier's recommendations.
7.2.4 Wetting is usually caused by condensation forming on the surface of the exposed test
piece or by spraying the test piece with deionized water.
7.3 General
The same as 6.3.
7.4 Significance
The same as 6.4.
7.5 Application of laboratory light source accelerated aging test
The same as 6.5.
7.6 Test device
7.6.1 For the fluorescent ultraviolet lamp test device in accordance with GB/T 16422.3, unless
otherwise specified, use UVA-340 (Type-1A) fluorescent ultraviolet lamp.
7.6.5 The test piece holder shall be made of inert material that shall not affect the exposure
results. Because the existence of the backing plate and the material used for the backing plate
shall affect the test piece, the material of the backing plate shall be agreed by the relevant parties.
If there is no provision, the stainless-steel backing plate shall be used.
7.7 Exposure conditions
7.7.1 Unless otherwise specified, control the irradiance according to the irradiation conditions
in Table 2.Other irradiation conditions may also be used by agreement between the parties
involved. The irradiance and its test wavelength bandwidth shall be indicated in the test report.
7.7.2 Unlike solar radiation, the heating of the surface of the test piece in fluorescent UV
equipment mainly depends on the action of hot air convection through the flat plate. Therefore,
the temperature difference between the black panel thermometer, the black standard
thermometer, the surface of the test piece and the air in the test chamber is generally less than
2 °C.
7.8 Test procedures
7.8.1 Installation of test pieces
Fix the tested area of the test piece on the test piece holder in the equipment in a way that is not
subject to any stress. Each test piece shall be marked with a label that cannot be easily
7.8.3 Measurement of radiation exposure
If necessary, install an irradiance meter to measure the irradiance on the exposed surface of the
test piece.
7.9 Test report
The test report shall include the following.
......
Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al.
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