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GB/T 18244-2000 PDF in English


GB/T 18244-2000 (GB/T18244-2000, GBT 18244-2000, GBT18244-2000)
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GB/T 18244-2000: PDF in English (GBT 18244-2000)

GB/T 18244-2000
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 91.120.30
Q 17
Test Methods for Resistance to Weathering of
Building Water Proofing Materials
ISSUED ON. OCTOBER 27, 2000
IMPLEMENTED ON. MAY 1, 2001
Issued by. State Bureau of Technical Supervision
Table of Contents
1 Scope ... 4 
2 Normative References ... 4 
3 General Requirements ... 4 
4 Hot Air Aging ... 8 
5 Ozone Aging ... 11 
6 Artificial Weathering Accelerated Aging (Xenon Arc Lamp) ... 14 
7 Artificial Weathering Accelerated Aging (Carbon Arc Lamp) ... 20 
8 Artificial Weathering Test (Ultraviolet Fluorescence- Condensing) ... 24 
Appendix A (Normative) Determination of the Temperature Uniformity of Air Aging
Test Chamber ... 28 
Appendix B (Normative) Determination of the Wind Speed in the Air Aging Test
Chamber ... 30 
Appendix C (Normative) Determination of the Ventilation Rate of the Air Aging Test
Chamber ... 32 
Appendix D (Normative) Performance and Provision of Carbon Arc Lamp Light
Source ... 34 
Appendix E (Informative) Table of Air Density ... 35 
Appendix F (Informative) Filter of Carbon Arc Lamp ... 36 
Appendix G (Informative) Typical Carbon Arc Lamp Test Equipment ... 37 
Foreword
This Standard was formulated on the basis of adopting international standards and
advanced standards of other countries, combining national conditions, and according
to the characteristics of building water proofing materials. Hot air aging
non-equivalently adopts JIS K 7212.1995 "Plastics - Determination of Thermal
Stability of Thermoplastics - Oven method"; ozone ageing non-equivalently adopts
ISO 1431.1.1989 "Vulcanized or Thermoplastic Rubber-Resistance to Ozone- Part 1.
Static Tensile Test "; artificial accelerated ageing non-equivalently adopts the relevant
parts of ISO 4892.1994 "Plastics - Methods of Exposure to Laboratory Light Sources".
During formulation of this Standard, the size, quantity and sampling method of the
samples are specified according to the characteristics of building water proofing
materials and test requirements; the test conditions and procedure which are
applicable to water proofing materials are recommended in the test methods; and the
evaluation method is formulated.
Appendixes A, B, C and D of this Standard are normative; Appendixes E, F and G are
informative.
This Standard was proposed by the State Bureau of Building Materials Industry.
This Standard shall be under the jurisdiction of the National Technical Committee on
Constructional Materials and Decorative Materials of Standardization Administration
of China.
Drafting organizations of this Standard. Standardization Research Institute of State
Bureau of Building Materials Industry, and China Chemical Building Material
Company Suzhou Waterproof Material Research and Design Institute.
Participating drafting organizations of this Standard. Panjin Yuwang Waterproof
Building Material Group, Shaoxing County Wanli Rubber Factory, Changshu Sanheng
Building Materials Co., Ltd., Beijing-Oakland Water Proof Building Materials Co., Ltd.,
Baoding Beifang Waterproofing Work Company, Shanghai Beicai Water Proof
Material Co., Ltd., Wujin Waterproof Material Factory, and Liaoyang No.1 Rubber
Factory.
Chief drafting staffs of this Standard. Zhu Zhiyua, Yang bin, Zhan Fumin, Meng
Yuezhen, Li Jiahao, Zhang Haoxiang, Li Xinquan, and Yu Zuiying.
This Standard is issued for the first time.
Test Methods for Resistance to Weathering of
Building Water Proofing Materials
1 Scope
This Standard specifies the test methods for hot air aging, ozone aging and artificial
weathering accelerated aging (xenon arc lamp, carbon lamp and UV fluorescence
lamp).
This Standard is applicable to the comparison between the aging-resistant
performance of pitch-based rolls and paints, high polymer rolls and paints used for
building water proofing work. Other building water proofing materials may also adopt
by reference.
2 Normative References
The following normative documents contain provisions which, through reference in
this Standard, constitute provisions of this Standard. At the time of publication, the
editions indicated were valid. All the standards will be revised and all parties who
reach an agreement according to this Standard are encouraged to study whether the
latest editions of the following standards are applicable.
GB 250-1995 Gray Scale for Assessing Change in Colour
GB 730-1998 Textiles-Tests for Colour Fastness - Blue wool Standards for Colour
Fastness to Light and Weathering (eqv ISO 105-B.1994)
GB/T 3511-1983 Rubber Vulcanized - The Test Method of Resistance to Natural
Weathering
GB/T 16777-1997 Test Methods for Building Waterproofing Coatings
3 General Requirements
3.1 Standard test conditions in laboratory
Temperature. 23°C±2°C;
Relative humidity. 45% ~ 70%.
3.2 Sample
Where,
W - Tensile property change rate, %;
P1 - Arithmetic mean value of tensile property of aged specimen;
P2 - Arithmetic mean value of tensile property of reference specimen.
Tensile property retention rate (X) shall be calculated according to Formula (2).
X=P1/P2 × 100 ... (2)
X - tensile property retention rate, %.
As for tensile property test result calculation, the arithmetic mean value of data in the
same direction shall be taken.
3.3.2 Low temperature
Flexibility test method shall be in accordance with the method stated in product
standard; the test temperature shall meet the product standard requirement or shall
not be lower than the temperature at which the products do not crack.
Tensile property and low temperature flexibility test results treatment shall be carried
out according to product standard.
3.4 Evaluation method
It shall be in accordance with product standard. If no requirement is stated in the
product standard, it may be judged according to the appearance and tensile property
changes as well as low temperature flexibility after aging test.
4 Hot Air Aging
4.1 Principle
Place test material in a test chamber to carry out heat and oxygen accelerated aging;
evaluate the heat resisting air aging property of material according to the property
changes before and after aging.
4.2 Test devices
4.2.1 Hot air aging test chamber
Test chamber shall meet the following requirements.
a) Working temperature. 40~200°C or higher;
b) Temperature fluctuation. ±1°C;
c) Temperature uniformity. temperature distribution shall meet the requirements
of temperature deviation in 4.3, see Appendix A (Normative);
d) Average air speed. 0.5~1.0m/s, see Appendix B (Normative);
e) Ventilation rate. 10~100 times/h, see Appendix C (Normative) and Appendix E
(Informative);
f) Work room. generally 0.1~0.3m3 in volume, otter boards and rotating frames
are set in the room.
4.2.2 Indicating thermometer
The scale interval of indicating thermometer is not larger than 1°C.
4.3 Test conditions
4.3.1 Test temperature
Test temperature shall be determined according to the material service requirements
and test purposes. Generally, the temperature may be 70°C for pitch-based water
proofing materials and 80°C for high polymer material; the allowable deviation of
humidity within 50~100°C is ±1°C, and that within 101~200°C is ±1% of the test
temperature.
4.3.2 Test period
Test period shall be determined according to material characteristics; generally, the
test terminal time is a specified exposure time or the exposure time when property
changes to a certain specified value; generally, 168h or longer may be adopted.
4.3.3 Ventilation rate
Ventilation rate may be chosen according to the characteristics and quantity of
samples; the samples mutually affecting each other shall be carried out with aging test
respectively; as for those cannot be confirmed that whether they mutually affecting
each other but have to be tested at the same time, larger ventilation rate is preferred.
4.4 Test procedure
4.4.1 Prior to test, specimens shall be numbered and the size shall be measured.
4.4.2 Test chamber shall be adjusted to the specified temperature and ventilation
volume according to test requirements. After stabilized, specimens may be put on
otter board or rotating frame using suitable metal clip or metal wire lined or wrapped
with inert material. The distance between specimen and internal wall of work room
shall not less than 70mm, and the distance between specimens shall not be less than
10mm; the ratio of work room volume to specimen total volume shall not less than 5.
1.
As for small specimens requiring relatively high test accuracy, double-shaft rotating
frame is recommended...
......
 
Source: Above contents are excerpted from the PDF -- translated/reviewed by: www.chinesestandard.net / Wayne Zheng et al.