GB/T 24498-2025 PDF English
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| GB/T 24498-2009 | English | 145 |
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GB/T 24498-2025: Gaskets for doors, windows and curtain walls of buildings---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/GBT24498-2025
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 91.100.50
CCS Q 24
Replacing GB/T 24498-2009
Gaskets for Doors, Windows and Curtain Walls of Buildings
Issued on: JANUARY 24, 2025
Implemented on: AUGUST 1, 2025
Issued by. State Administration for Market Regulation;
Standardization Administration of the People’s Republic of China.
Table of Contents
Foreword... 3
1 Scope... 6
2 Normative References... 6
3 Terms and Definitions... 7
4 Classification, Code and Signing... 8
5 Technical Requirements... 9
6 Test Methods... 16
7 Inspection Rules... 24
8 Marking, Packaging, Transportation and Storage... 27
Gaskets for Doors, Windows and Curtain Walls of Buildings
1 Scope
This Document specifies the classification, code and signing, technical requirements, test
methods, inspection rules and marking, packaging, transportation and storage of gaskets for
doors, windows and curtain walls of buildings.
This Document is applicable to the design, production and inspection of gaskets for doors,
windows and curtain walls of buildings.
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 250 Textiles - Tests for color fastness - Grey scale for assessing change in color
GB/T 528-2009 Rubber, vulcanized or thermoplastic - Determination of tensile stress-
strain properties
GB/T 529-2008 Rubber vulcanized or thermoplastic - Determination of tear strength
(Trouser, angle and crescent test pieces)
GB/T 531.1 Rubber, vulcanized or thermoplastic - Determination of indentation hardness
- Part 1.Durometer method (Shore hardness)
GB/T 533-2008 Rubber vulcanized or thermoplastic - Determination of density
GB/T 1682 Rubber, vulcanized - Determination of low-temperature brittleness - Single
test piece method
GB/T 2828.1 Sampling procedures for inspection by attributes - Part 1.Sampling schemes
indexed by acceptance quality limit (AQL) for lot-by-lot inspection
GB/T 3512 Rubber, vulcanized or thermoplastic - Accelerated ageing and heat resistance
tests - Air-oven method
GB/T 3672.1-2002 Rubber - Tolerances of products - Part 1.Dimensional tolerances
GB/T 3672.2-2002 Rubber - Tolerances of products - Part 2.Geometrical tolerances
GB/T 6343 Cellular plastics and rubbers - Determination of apparent density
GB/T 7759.1-2015 Rubber, vulcanized or thermoplastic - Determination of compression
set - Part 1.At ambient or elevated temperatures
GB/T 7762 Rubber, vulcanized or thermoplastic - Resistance to ozone cracking - Static
strain testing
GB/T 8627 Test method for density of smoke from the burning or decomposition of
building materials
GB/T 9881-2008 Rubber - Vocabulary
GB/T 10707 Rubber - Determination of the burning
GB/T 16422.2-2022 Plastics - Methods of exposure to laboratory light sources - Part 2.
Xenon-arc lamps
GB 16776-2005 Structural silicon sealants for building
GB/T 18173.3-2014 Polymer water-proof materials - Part 3.Hydrophilic expansion rubber
GB/T 20739 Rubber products - Guidelines for storage
GB/T 21282-2007 Rubber/Plastics weatherstrip for automobile
QC/T 941-2013 Test Method for Mercury in Automobiles Materials
QC/T 942-2021 Test methods of hexavalent chromium in automotive materials
QC/T 943-2013 Test methods of lead and cadmium in automobiles materials
QC/T 944-2013 The methods of polybrominated biphenyls and polybrominated diphenyl
ethers in automotive materials
3 Terms and Definitions
For the purposes of this Document, the terms and definitions given in GB/T 9881-2008 and the
following apply.
3.1 Gaskets
The seal, installed in the opening or fixed part of doors, windows and curtain walls, has a sealing
function.
5.4.10 Brittle temperature
The specimen of the coated sponge complex weatherstrip shall not have cracks or breaks after
the test at -20 ℃.
5.4.11 Repeated water absorption performance
After the water absorption test of the coated sponge complex weatherstrip is repeated for 4
cycles, the product shall meet the following requirements.
a) The mass change rate is no greater than 5%;
b) The deflection recovery is no less than 90%;
c) The compression force change value is no greater than 30%.
5.4.12 High and low temperature resistance
After the high and low temperature test of the coated sponge complex weatherstrip is repeated
for 4 cycles, the product shall meet the following requirements.
a) The deflection recovery is no less than 90%;
b) The compression force change value is no greater than 30%.
5.4.13 Fatigue resistance
After 200,000 fatigue tests on the coated sponge complex weatherstrip, the product shall meet
the following requirements.
a) The deflection recovery is no less than 90%;
b) The compression force change is no greater than 30%;
c) The surface coating film shall not be damaged, fractured or cracked; and the coating film
shall not be separated from other composite materials.
5.4.14 Compression force
The compression force shall meet the sealing requirements of doors, windows and curtain walls.
The classification shall be agreed upon by the supplier and the purchaser according to the needs.
The compression force (DN) classification shall comply with the provisions of Table 14.
The test shall be performed in accordance with the provisions of GB/T 528-2009, using a type
1 dumbbell-shaped specimen (sponge rubber extruded foam sheet), and the test speed is 500
mm/min±50 mm/min.
6.2.3 Tear strength
The test shall be performed in accordance with the provisions of GB/T 529-2008, using a right-
angle, uncut specimen.
6.2.4 Compression permanent deformation
The test shall be performed in accordance with the provisions of GB/T 7759.1-2015, using type
A specimen, test temperature 100 ℃ (thermoplastic elastomer test temperature 70 ℃), test time
220.5 0 h, specimen compression (25±2)%.
6.2.5 Aging in hot air
The test shall be performed in accordance with the provisions of GB/T 3512; test temperature
100 ℃, test time 168 h ± 1 h. Prepare and test the specimens according to the hardness and
tensile strength requirements.
6.2.6 Hardness change
Put the specimen (with diameter no less than 30 mm, thickness no less than 6 mm) in a constant
temperature container at -20 ℃ ±2 ℃, 0 ℃ ±2 ℃, 23 ℃ ±2 ℃, 70 ℃ ±2 ℃; take it out after
2 h±0.25 h; measure the hardness within 10 s according to the method specified in GB/T 531.1;
and calculate the hardness difference of each temperature section according to Tables 3, 4, 6, 7.
6.2.7 Low temperature brittleness
The test shall be performed according to the provisions of GB/T 1682.
6.2.8 Oxygen index
The test shall be performed according to the provisions of GB/T 10707.
6.2.9 Vertical combustion performance
The test shall be performed according to the provisions of GB/T10707.
6.2.10 Smoke density
The test shall be performed according to the provisions of GB/T 8627; the specimen size is
(25.4±0.3)mm × (25.4±0.3)mm × (6.2±0.3)mm.
6.2.11 Water-swelling performance
6.2.11.1 Volume swelling ratio
The test shall be performed according to the provisions of Appendix A in GB/T 18173.3-2014.
6.2.11.2 Repeated immersion test
The test shall be performed according to the provisions of 6.3.5 in GB/T 18173.3-2014.
6.3 Product appearance
Visually inspect the product appearance quality under natural light or equivalent artificial light
source at a distance of 0.3 m.
6.4 Product dimension tolerance
Take a 2 mm to 3 mm thick cross-section test piece of the product and test it with a non-contact
measuring instrument with corresponding graduation value (such as a projector or scanner that
can magnify 5× or 10×).
6.5 Product performance
6.5.1 Product density
Dense gaskets shall be tested in accordance with the provisions of Method A in 7.1 of GB/T
533-2008.Sponge gaskets shall be tested in accordance with the provisions of GB/T 6343.Five
specimens of 200 mm ± 10 mm shall be cut from the gasket product. The volume of the
specimen is the product of the cross-sectional area of the sponge gasket and the actual length
of the tested specimen.
6.5.2 Deflection recovery
Cut three specimens of 100 mm in length from the gasket product. Perform the test and
calculation according to the following steps.
a) Use a non-contact measuring instrument to measure the free height (H0) of the specimen,
accurate to 0.05 mm.
b) Fix the specimen on the test device; apply a uniform load on the pressure-bearing working
surface; compress the specimen to the maximum value of the design working range (W).
And place it in an environment of 70 ℃ ± 2 ℃ for 240 -2h; after taking it out, cool it to
ambient temperature and unload it.
c) Place the specimen in a standard temperature and humidity environment in a horizontal
state without pressure and with the working surface facing upward for 240 -2h; and measure
the average free height (H1) after the test according to the method in a).
d) Calculate according to Formula (1); take the arithmetic mean of the three specimens; and
retain 3 significant figures for the result.
specimen to expose the added wire with a length of 10 mm; and peel off the other side of the
specimen to remove the added wire with a length of 10 mm. Place one group of specimens after
treatment in 70 ℃ ± 2 ℃ and -20 ℃ ± 2 ℃ environments, respectively; and take them out after
1 h. Under standard temperature and humidity conditions, clamp 6 mm at both ends of the
product in the longitudinal (length) direction; and pull at a uniform speed of 100 mm/min ± 10
mm/min until it is broken. After the test, check whether the added wire of the specimen is pulled
out.
6.5.9 Friction coefficient
The test shall be performed according to the provisions of Appendix C in GB/T 21282-2007.
6.5.10 Brittle temperature
The test shall be performed according to the provisions of GB/T 1682.
6.5.11 Repeated water absorption performance
Cut 6 specimens of 100 mm±10 mm from the gasket product; and measure the compression
force and deflection recovery grade of the product before testing 3 specimens. Soak the other 3
specimens in 23 ℃±2 ℃ distilled water for 16 h; take them out and dry them at 70 ℃±2 ℃ for
8 h. Then soak them in distilled water for 16 h; take them out and dry them for another 8 h. This
is one cycle. And the test time deviation is ±0.25 h. After 4 repeated cycles, measure the
deflection recovery and compression force; and calculate the rate of change.
6.5.12 High and low temperature resistance
Cut six specimens of 100 mm ± 10 mm from the gasket product. Measure the compression
force and deflection recovery grade of the product before the test of three specimens. Place the
other three specimens in the air at 23 ℃ ± 2 ℃ for 18 h; and then the specimens were placed
in a -20 ℃ ± 2 ℃ low temperature box for 3 h. The specimens were taken out of the low
temperature box and immediately placed in a 50 ℃ ± 2 ℃ constant temperature box for 3 h.
This is one cycle; and the test time deviation is ± 0.25 h. After 4 repeated cycles, measure the
deflection recovery and compression force; and calculate the rate of change.
6.5.13 Fatigue resistance
Cut six specimens of 100 mm ± 10 mm from the gasket product. Measure the compression
force and deflection recovery grade of the product before the test of three specimens. Place the
other 3 specimens on the fatigue testing machine; adjust the amplitude of the fatigue testing
machine to the specimen working range, accurate to 0.1 mm. Compress the working surface of
the specimen from the zero-compression position to the designed working range. Repeat the
test, the specimen frequency is (600±30) times per hour. After the test, remove the specimen;
place it in a standard temperature and humidity environment for 240 -2h in a horizontal state
without compression and with the working surface facing up; measure the deflection recovery
and compression force; and calculate the rate of change.
7.2.2 Qualification judgment rules
When the inspection items do not meet the requirements of Clause 5, the batch of products is
judged to be unqualified.
7.3 Type inspection
7.3.1 Inspection timing
Type inspection shall be carried out in any of the following situations.
a) When new products or old products transferring to other factory for trial design and
identification production;
b) When there are major changes in cross-section, materials, and processes that may affect
product performance, after formal production;
c) When production is resumed after product discontinuation;
d) When during normal production, it is carried out once a year; light aging test is carried
out once every 3 years;
e) When the exit-factory inspection results are significantly different from the last type
inspection.
7.3.2 Batching and sampling plan
The continuous production with the same raw materials, process, formula, and specification are
considered as a batch; and the mass of each batch is no less than 5,000 kg. If the output is less
than 5,000 kg, the output of 7 days is considered as a batch. Samples and products are taken for
inspection at 3 times the number of samples and products in the test method of Clause 6.
7.3.3 Qualification judgment rules
When the product does not meet the requirements of this Document, the samples shall be
doubled from the original batch for re-inspection; if it still does not meet the requirements, it
will be judged as unqualified.
8 Marking, Packaging, Transportation and Storage
8.1 Marking
8.1.1 The finished product should be marked with the manufacturer's information.
8.1.2 The obvious part of the product packaging or the certificate of conformity attached with
the box shall indicate 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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