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QC/T 1090-2017 (QC/T1090-2017)

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QC/T 1090-2017: PDF in English (QCT 1090-2017)
QC/T 1090-2017
AUTOMOBILE INDUSTRY STANDARD
OF THE PEOPLE’S REPUBLIC OF CHINA
ICS 43.060.10
T 12
Specifications of sealing gaskets for automotive
engines
ISSUED ON: JULY 07, 2017
IMPLEMENTED ON: JANUARY 01, 2018
Issued by: Ministry of Industry and Information Technology of PRC
Table of Contents
Foreword ... 5 
1 Scope ... 6 
2 Normative references ... 6 
3 Gasket classification ... 7 
4 Technical requirements ... 7 
5 Test methods ... 8 
6 Inspection rules ... 12 
7 Marking, packaging, transportation, storage ... 13 
Appendix A (Normative) Classification of gaskets ... 14 
Appendix B (Normative) Requirements for gasket thickness ... 15 
Appendix C (Normative) Physical properties ... 17 
Specifications of sealing gaskets for automotive
engines
1 Scope
This standard specifies the product classification, technical requirements,
inspection methods, inspection rules, marking, packaging, transportation,
storage of sealing gaskets for automotive engines (hereinafter referred to as
the gasket).
This standard is applicable to sealing gaskets used in the static sealing parts of
automobile engines made of fiber rubber metal composite, graphite metal
composite, non-metal coated steel plate, metal steel plate, non-metallic sealing
materials. It is not applicable to the gaskets for cylinder.
2 Normative references
The following documents are essential to the application of 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) are applicable to this standard.
GB/T 540-2008 Test methods for oil-resisting compressed asbestos fiber
jointing
GB 1922-2006 Petroleum solvents for paints and cleaning
GB/T 6739-2006 Paint and varnishes - Determination of film hardness by
pencil test
GB/T 8170 Rules of rounding off for numerical values & expression and
judgement of limiting values
GB/T 19055-2003 Reliability test methods for motor vehicle engines
GB/T 20671.2 Classification system and test methods for nonmetallic gasket
materials - Part 2: Standard test method for compressibility and recovery of
gasket materials
GB/T 20671.3 Classification system and test methods for nonmetallic gasket
materials - Part 3: Standard test method for fluid resistance of gasket
materials
During the reliability test of the engine, there shall be no gas leakage, oil
leakage or water leakage caused by the quality of the gasket.
5 Test methods
5.1 Test equipment
5.1.1 Electrothermal drying oven: 0 °C ~ 250 °C, resolution is 0.1 °C.
5.1.2 Dryer.
5.1.3 Micrometer: The working face has a diameter of 6 mm ~ 10 mm and a
graduation value of 0.01 mm.
5.1.4 Vernier caliper: The graduation value is 0.02 mm.
5.1.5 Balance: The sensitivity is 0.001 g.
5.1.6 High temperature furnace: 0 °C ~ 1100 °C, the resolution is 1 °C.
5.2 Conditioning of specimen
All samples for physical property test shall be conditioned in an incubator at
100 °C ± 2 °C for 1 h, then transferred to a dryer which contains anhydrous
calcium chloride to cool it to 21 °C ~ 30 °C. Then start testing.
5.3 Inspection of appearance quality
The appearance quality is checked by visual inspection.
5.4 Measurement of thickness
Use a micrometer to measure the thickness of the gasket. Uniformly measure
three points on one gasket. Use the arithmetic mean as thickness measurement
result.
5.5 Determination of density
5.5.1 Determination of the density of non-metallic gaskets.
It is performed according to GB/T 22308-2008.
5.5.2 Determination of density deviation of graphite metal composite gaskets.
It is performed according to JB/T 6628.
5.5.3 Determination of density of fiber rubber metal composite gaskets.
Cut a 40 mm × 40 mm fiber rubber metal composite gasket material test piece
5.11.2.2 Test evaluation.
If there is no peeling expansion on both surfaces of the three specimens, the
test results are reported to be acceptable; otherwise they are unqualified.
5.12 Determination of corrosivity
It is performed according to GB/T 540-2008.
5.13 Determination of nitrogen leak rate
It is performed according to the provisions of the test method B - Test method
of gas leak rate in GB/T 20671.4-2006. The specimen is a concentric ring which
has an inner diameter of 32.3 mm ± 0.1 mm and an outer diameter of 44.3 mm
± 0.1 mm. The thickness of the specimen is the actual thickness of the product.
The flange pressing force is 20 MPa ± 1 MPa. The test medium is nitrogen
which has a purity of more than 99%. The medium’s pressure is 0.98 MPa ±
0.02 MPa.
5.14 Oil seal test
It is performed according to GB/T 540-2008.
5.15 Determination of peelability
5.15.1 Test procedure.
5.15.1.1 Cut 3 pieces of 20 mm × 100 mm specimens. The edges shall be cut
neatly.
5.15.1.2 Peel off the fiber rubber layer on both sides of the conditioned sample
strip. Then observe the surface of the metal core sheet after peeling off.
5.15.2 Test evaluation.
If the surface of the metal core plate of the three specimens are adhered with a
fiber rubber layer, the test results are reported to be acceptable, otherwise it is
unqualified.
5.16 Determination of loss on ignition
Cut the 40 mm × 40 mm gasket material test piece and the corresponding metal
material test piece of the same specification. Respectively measure their length,
width, thickness. Weigh their mass. Calculate the density of the metal material
test piece. Place the gasket material test piece in a high-temperature furnace
at a predetermined test temperature for 1 hour. Take it out and cool it to room
temperature. Weigh the mass. The mass difference before and after the burning
of the test piece is divided by the difference of the mass of the test piece before
Observe the remaining of the grid portion.
5.18.2 Test evaluation is in accordance with Appendix C.
5.19 Determination of coating hardness
It is performed according to GB/T 6739-2006.
5.20 Reliability test
The gasket shall be tested together with the engine for reliability, in accordance
with GB/T 19055-2003.
6 Inspection rules
6.1 General requirements
The gasket shall be inspected by the quality inspection department of the
manufacturer in accordance with this standard and technical documents,
meanwhile accompanied with a certificate of conformity.
6.2 Classification of inspections
6.2.1 Exit-factory inspection.
The exit-factory inspection items are: appearance, size and deviation, density,
density deviation, transverse tensile strength, compression rate, rebound rate,
softness, weight gain rate after antifreeze immersion, thickening rate after
antifreeze immersion, change of appearance after antifreeze immersion,
peelability, adhesion, coating hardness.
6.2.2 Type inspection.
The type inspection of the gasket includes all the items as specified in Chapter
4.
Type inspection shall be carried out in one of the following cases:
a) The product of trial production or first batch production;
b) After formal production, if there are major changes in structure, materials
and processes, which may affect product performance;
c) During the normal production, the type inspection shall be carried out once
every six months;
d) When the production is restored after suspension for more than one year;
......
 
(Above excerpt was released on 2019-11-16, modified on 2021-06-07, translated/reviewed by: Wayne Zheng et al.)
Source: https://www.chinesestandard.net/PDF.aspx/QCT1090-2017