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QC/T 639-2004: Rubber weatherstrips for automobile
QC/T 639-2004
AUTOMOTIVE INDUSTRY STANDARD
OF THE PEOPLE’S REPUBLIC OF CHINA
Replacing QC/T 639-2000, QC/T 640-2000
Rubber Weatherstrips for Automobile
ISSUED ON: OCTOBER 20, 2004
IMPLEMENTED ON: APRIL 01, 2005
Issued by: National Development and Reform Commission
Table of Contents
Foreword ... 3
1 Scope ... 4
2 Normative References ... 4
3 Requirements ... 5
4 Test Methods ... 9
5 Inspection Rules ... 11
6 Marking, Package, Transportation and Storage ... 13
Appendix A (Normative) Corrosivity Test Method of Rubber Weatherstrips ... 15
Appendix B (Normative) Low-Temperature Property Test Method of Rubber
Weatherstrips ... 18
Appendix C (Normative) Test Method for Breakout Force between Dense
Rubber and Sponge Rubber of Rubber Weatherstrips ... 20
Appendix D (Normative) Test Method for Binding Force between Connector
and Connection Angle of Rubber Weatherstrips ... 23
Appendix E (Informative) Classification of Rubber Weatherstrips for
Automobile ... 25
Foreword
This Standard replaced QC/T 639-2000 Buses - Rubber Sealing Strips of Doors and
Windows, and QC/T 640-2000 Buses – Flocking Sealing Strips of Doors and Windows.
Compared with QC/T 639-2000 and QC/T 640-2000, this Standard has the major
changes as follows:
--- Combine the two standards into the one standard; change the standard name
into Rubber Weatherstrips for Automobile;
--- Add the Appendixes A, B, C, D and E.
--- Add product length table without tolerance;
--- Add “corrosivity”, “water resistance” items to the properties of the rubber;
--- Delete “tear performance” item from the properties of the rubber;
--- Add three hardness range of the rubber of 50±5, 80±5, 90±5 to the properties of
the rubber; and improve the original index;
--- Replace the expression of oxygen concentration of ppm by 10-6;
--- Add 11 items for the performance of the finished products; and the corresponding
standards of the test methods.
Appendixes A, B, C, and D of this Standard are normative; while Appendix E is
informative.
This Standard was proposed by National Technical Committee for Standardization of
Automobile.
This Standard shall be under the jurisdiction of National Technical Committee for
Standardization of Automobile.
Drafting organizations of this Standard: Shanghai SAIC-METZELER Sealing Systems
Co., Ltd.; Beijing Wanyuan Gdx Automotive Sealing Products Co., Ltd.; Guizhou
Guihang Automobile Parts Co., Ltd. Hongyang Seal Components Corporation; Tianjin
Xingguang Rubber Plastic Co., Ltd.; Chongqing Yifeng Automobile Sealing Strips Co.,
Ltd.; Xiamen Baiji Sealing Element Co., Ltd.; and Hubei Konx Automobile Sealing
Strips Co., Ltd.
Chief drafting staffs of this Standard: Chen Haiyan, Ma Junli, Hu Zhugeng, Hao Jie,
Deng Mingxiang, He Wenbing, and Yu Gangli.
Rubber Weatherstrips for Automobile
1 Scope
This Standard specifies the technical requirements, test methods, inspection rules,
marking, package, transportation and storage of rubber weatherstrips for automobile.
This Standard is applicable to the various weatherstrips for automobile manufactured
by the base material of EPDM rubber.
2 Normative References
The provisions in following documents become the provisions of this Standard through
reference in this Standard. For dated references, the subsequent amendments
(excluding corrigendum) 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 528-1998 Rubber, Vulcanized or Thermoplastic - Determination of Tensile
Stress-Strain Properties (eqv ISO 37:1994)
GB/T 531-1999 Rubber - Determination of Indentation Hardness by Means of
Pocket Hardness Meters (idt ISO 7619:1986)
GB/T 1682-1994 Rubber, Vulcanized - Determination of Low-Temperature
Brittleness (Single Test Piece Method) (eqv ISO 812:1991)
GB/T 2828.1-2003 Sampling Procedures for Inspection by Attribute – Part 1:
Sampling Schemes Indexed by Acceptance Quality Limit (AQL) for Lot-by-Lot
Inspection (idt ISO 2859-1:1999)
GB/T 2941-1991 Standard Temperature, Humidity and Time for Environmental
Regulation and Testing of Rubber Samples (eqv ISO 471:1983)
GB/T 3511-2001 Rubber, Vulcanized and Thermoplastic - The Test Method of
Resistance to Direct Natural Weathering (neq ISO 4665:1998)
GB/T 3512-2001 Rubber, Vulcanized or Thermoplastic - Accelerated Ageing and
Heat Resistance Tests - Air-Oven Method (eqv ISO 188:1998)
GB/T 3672.1-2002 Rubber - Tolerances of Products - Part 1: Dimensional
Tolerances (idt ISO 3302-1:1996)
GB/T 5721-1993 General Rules of Identification, Packaging, Transportation and
Storage for Rubber Sealing Products
GB/T 7759-1996 Rubber, Vulcanized or Thermoplastic - Determination of
Compression Set at Ambient Elevated or Low Temperatures (eqv ISO 815:1991)
GB/T 7762-2003 Rubber, Vulcanized or Thermoplastic - Resistance to Ozone
Cracking - Static Strain Test (eqv ISO 1431-1:1989)
GB/T 8170-1987 Rules of Rounding off for Numerical Values
GB/T 9868-1988 Rubber - General Directions for Achieving Elevated or
Subnormal Temperatures for Test Purposes (idt ISO 3383-1985)
GB/T 12831-1991 Rubber, Vulcanized - Test Method of Resistance to Artificial
Weathering (Xenon Lamp) (neq ISO 4665-3:1987)
GB/T 19243-2003 Rubber, Vulcanized or Thermoplastic - Methods of Test for
Staining in Contact with Organic Material (idt ISO 3865:1997)
HG/T 2369-1992 Technical Conditions on Rubber Plastic Tensile Testing Machine
HG/T 3055-1988(1997) Latex Foam - Determination of Apparent Density (eqv ISO
845:1997)
HG/T 3090-1987(1997) General Rules of Visual Quality for Moulded and Extruded
Rubber Products
QC/T 709-2004 Test Method of Compression Set for Automobile Weatherstrips
QC/T 710-2004 Test Method of Compression Load for Automobile Weather-Strips
QC/T 711-2004 Test Method of Abrasion of Flock for Automotive Weather-Strips
QC/T 716-2004 Retention Strength and Insertion Resistance Test Method for
Automobile Weatherstrips
3 Requirements
3.1 General requirements
The weatherstrips shall be manufactured in accordance with technical document
approved by the specified procedures. If the user has other special requirements, it
shall be determined through the negotiation between the supplier and the purchaser.
3.2 Appearance
3.2.1 The appearance for the dense rubber of the weatherstrips shall conform to the
relevant provisions of HG/T 3090-1987(1997). The appearance for the sponge rubber
shall be free of the defects that may affect the appearance and use performance of the
products, such as bubbles, cracked skin, broken skin, lack of rubber, etc.
3.2.2 The flocked surface is evenly flocked; the surface is clean, no stains; and the
substrate is not allowed to be exposed.
3.2.3 The special requirements shall meet the requirements of the approved sealed
sample or sample determined through the negotiation between the supplier and the
purchaser.
3.3 Specification size
3.3.1 The shape and size of the cross-section of product shall be within the tolerance
range of control chart with a magnification of 10. If the drawings have no explicit
requirements, it can be performed as per GB/T 3672.1-2002.
3.3.2 The length size and tolerance of the products shall conform to the relevant
provisions of the product drawings. The tolerance that is not indicated can be
performed as per Table 1.
Table 1 Unindicated Tolerance mm (except those indicated otherwise)
3.4 Materials
3.4.1 The substrate material of the weaterstrips take the rubber compound with EPDM
as the main raw material; the rubber properties shall meet the requirements of Table
2.
3.4.2 The auxiliary materials (such as fluff, skeleton material, etc.) of weatherstrips
shall conform to the relevant provisions of the product drawings.
Size
Tolerance Tolerance
Size Dense
rubber/compound
composition
Dense
rubber/compound
composition
Sponge rubber Sponge rubber
Greater than
4000
Table 2 – Rubber Properties
3.5 Properties of finished products
The properties of finished products shall meet the requirements of Table 3.
Table 3 – Properties of Finished Products
Items Property index Test method
Compression set [(70±2) °C/96h], % As per requirements of drawings 4.4.2
Compression load (squeezing force), N As per requirements of drawings 4.4.3
Insertion force, N As per requirements of drawings 4.4.4
Withdrawal force, N As per requirements of drawings 4.4.4
Low-temperature property [(-40±2) °C/24h] Still be elastic, no cracks 4.4.5
Breakout force between dense rubber and
sponge rubber, N ≥100 4.4.6
Binding force of connector/connection angle ≥120 4.4.7
Flocking wear resistance ≥ Level-4 4.4.8
Low-temperature property of coating [(-
40±2) °C/24h]
Coating has no cracks, not
separated from the substrate 4.4.9
Light aging resistance ≤ Level-1 4.4.10
Hardness change (Shore A),
degree
Brittle temperature, °C
Items
Property indexes
Dense rubber Sponge rubber
Test
methods
Hardness change (Shore A), degree
Elongation at break, %
Tensile strength, MPa
Change rate of tensile
strength, %
Change rate of elongation at
break, %
Hardness change (Shore A),
degree
Change rate of tensile
strength, %
Change rate of elongation at
break, %
Hot air aging
Water resistance
Appearance density, g/cm3
Compression set, %
No higher than
Tensile 20%, (40±2) °C, 72h
Ozone concentration (2±0.2)10-6 Ozone aging resistance
No cracks No cracks No cracks No cracks No cracks No cracks
Pollution Method A Slightly polluted
Corrosivity Level-1: has not become black
NOTE 1: The windshield and flocked weatherstrips need to be tested for water resistance.
NOTE 2: The dumbbell-shaped test piece in the items of tensile strength and elongation at break is preferred to use the Type-2 test piece.
Weather aging resistance As per requirements of drawings 4.4.11
4 Test Methods
4.1 Appearance
The appearance quality shall be inspected by the visual examination method under
the standard environment conditions.
4.2 Specification size
4.2.1 For the inspection for the shape and size of the cross-section, take the sample
with thickness of (2~5) mm; then project on a 10× projection magnifier; perform control
inspection on the corresponding product cross-section by 10× magnification control
chart.
4.2.2 The length of the finished product shall be inspected by a special inspection tool
of the corresponding product, or measuring tool with corresponding accuracy.
4.3 Rubber properties
4.3.1 The hardness test shall be performed as per the method specified in GB/T 531-
1999.
4.3.2 The tests on tensile strength and elongation at break shall be performed as per
the method specified in GB/T 528-1998. Thereof, when calculating the area of the
sponge rubber test piece, the honeycomb shape shall be neglected. When measuring
the thickness and width of the test piece, the specimen shall be unstressed.
4.3.3 The hot air aging test shall be performed as per the method specified in GB/T
3512-2001. After the specimen is placed as per requirements, adjust for 2h at the
ambient temperature of (23±2) °C; then perform the corresponding property test.
4.3.4 Water resistance test: place the specimen in the deionized water at the specified
temperature; place it as required by the test time. When the test temperature is higher
than the lab standard ambient temperature for [(23±2) °C], fully immerse the specimen
in the constant temperature water batch; place it as required by the test time. After the
end of the placement, take out the specimen from the deionized water; firstly, dry it
with a clean fabric or paper with good water absorption properties; then adjust for 2h
at the ambient temperature of (23±2) °C; finally, perform the corresponding test.
4.3.5 The apparent density test of the sponge shall be performed as per the method
specified in HG/T 3055-1988 (1997).
4.3.6 The compression set test shall be performed as per the method specified in GB/T
7759-1996.
4.3.7 Brittle temperature test shall be performed as per the method specified in GB/T
1682-1994.
4.3.8 Ozone aging resistance test shall be performed as per the Method A in GB/T
7762-2003.
4.3.9 Pollution test shall be performed as per the method specified in GB/T 19243-
2003.
4.3.10 Corrosivity test shall be performed as per the method specified in Appendix A.
4.4 Properties of finished products
4.4.1 The specimen for the test on properties of finished products shall be taken from
the squeezing semi-finished products or finished products. The specimen shall meet
the following requirements:
a) The time interval between test and vulcanization (referring to the lower extrusion
line) and the adjustment of the specimen before test shall be carried out as per
the method specified in GB/T 2941-1991.
b) Before the test, the specimen shall be adjusted for 3h under the environment with
temperature of (23±2) °C, and relative humidity of (50±5) %; the specimen shall
not be applied force during the adjusting period.
c) Except for special requirements, three specimens shall be taken from different
finished products with the required length of the test.
4.4.2 Compression set test shall be performed as per the provisions of QC/T 709-2004.
4.4.3 Compression load test shall be performed as per the provisions of QC/T 710-
2014.
4.4.4 The tests on insertion force and withdrawal force shall be performed as per the
provisions of QC/T 716-2004.
4.4.5 Low-temperature property test shall be performed as per the provisions of
Appendix B.
4.4.6 Breakout force test between dense rubber and sponge rubber shall be performed
as per the provisions of Appendix C.
4.4.7 Binding force test between connector and connection angle shall be performed
as per the provisions of Appendix D...