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QC/T 236-2019

Chinese Standard: 'QC/T 236-2019'
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BASIC DATA
Standard ID QC/T 236-2019 (QC/T236-2019)
Description (Translated English) (Test method for performance of automotive interior materials)
Sector / Industry Automobile & Vehicle Industry Standard (Recommended)
Older Standard (superseded by this standard) QC/T 236-1997
Regulation (derived from) Ministry of Industry and Information Technology Announcement No. 48 of 2019

QC/T 236-2019
QC
AUTOMOBILE INDUSTRY STANDARD
OF THE PEOPLE’S REPUBLIC OF CHINA
ICS 43.040.60
T 20
Replacing QC/T 236-1997
Test method for automotive interior decorative
material properties
汽车内饰材料性能的试验方法
ISSUED ON: NOVEMBER 11, 2019
IMPLEMENTED ON: APRIL 01, 2020
Issued by: Ministry of Industry and Information Technology of PRC
Annex:
39 automotive industry standard numbers, standard names
and implementation dates
No. Standard number Standard name Replaced standard number
Date of
implementation
33 QC/T 826-2019 Bridge inspection vehicle QC/T 826-2010 2020-04-01
34 QC/T 1107-2019 Compression garbage truck 2020-04-01
35 QC/T 53-2019 Fecal suction truck QC/T 53-2006 2020-04-01
36 QC/T 1108-2019 Pneumatic solenoid valve for commercial vehicles 2020-04-01
37 QC/T 708-2019 Automotive air conditioning fan QC/T 708-2004 QC/T 29092-1992 2020-04-01
38 QC/T 1109-2019 Dimming motor for automotive front lighting 2020-04-01
39 QC/T 829-2019 Technical requirements for diesel vehicle exhaust aftertreatment system QC/T 829-2010 2020-04-01
40 QC/T 1110-2019 Fuel heating device for automobile diesel engine 2020-04-01
41 QC/T 1113-2019
Technical requirements and test methods for quick-
plug connectors for automobile pneumatic brake
systems
2020-04-01
42 QC/T 29082-2019 Technical conditions of automobile drive shaft assembly and bench test method
QC/T 29082-1992
QC/T 523-1999 2020-04-01
43 QC/T 1114-2019
Technical conditions and bench test methods for
automobile’s mechanical automatic transmission (AMT)
assembly
2020-04-01
44 QC/T 568-2019 Technical conditions and bench test methods of automobile mechanical transmission assembly
QC/T 568.1-2011
QC/T 29063.1-2011 2020-04-01
45 QC/T 1115-2019 Technical requirements and test methods of automatic transmission (AT) 2020-04-01
46 QC/T 216-2019 Car carpet QC/T 216-1996 2020-04-01
47 QC/T 1116-2019 Dust suppression vehicle 2020-04-01
48 QC/T 1117-2019 Animal and poultry harmless transport vehicles 2020-04-01
49 QC/T 453-2019 Van transport truck QC/T 453-2002 2020-04-01
50 QC/T 447-2019 Construction slab transport truck QC/T 447-1999 2020-04-01
51 QC/T 1118-2019 Technical requirements for van exchange box 2020-04-01
52 QC/T 1121-2019 Plastic fuel tanks for automobiles 2020-04-01
53 QC/T 1122-2019 Technical requirements of electric water pump for automobile engine 2020-04-01
54 QC/T 626-2019 Automotive window regulator QC/T 626-2008 QC/T 636-2014 2020-04-01
Table of Contents
Foreword ... 7 
1 Scope ... 9 
2 Normative references ... 9 
3 Conditioning of specimen state ... 10 
4 Test method ... 10 
Appendix A (Normative) Required load elongation and residual distortion ... 16 
Appendix B (Normative) Determination of formaldehyde content ... 18 
Appendix C (Normative) Determination of total carbon volatilization ... 24 
Test method for automotive interior decorative
material properties
1 Scope
This standard specifies the test methods for the mass per unit area, thickness,
breaking strength (tensile strength) and elongation at break, joint strength,
required load elongation and residual deformation, abrasion resistance, color
fastness to rubbing, color fastness to light, odor, formaldehyde content,
atomization, total carbon volatilization, combustion characteristics of
automotive interior textiles (including woven fabrics, knitted fabrics, non-woven
fabrics) and synthetic leather materials.
This standard applies to test the automotive interior textiles (including woven
fabrics, knitted fabrics, non-woven fabrics) and synthetic leather materials.
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 3920 Textiles - Tests for color fastness - Color fastness to rubbing
GB/T 3923.1 Textiles - Tensile properties of fabrics - Part 1:
Determination of maximum force and elongation at maximum force using the
strip method
GB/T 4669- 2008 Textiles - Woven fabrics - Determination of mass per unit
length and mass per unit area
GB/T 13773.1 Textiles - Seam tensile properties of fabrics and made-up
textile articles - Part 1: Determination of maximum force to seam rupture
using the strip method
GB/T 16991 Textiles - Test for color fastness - Color fastness and ageing to
artificial light at high temperatures: Xenon arc
GB/T 21196.2 Textiles - Determination of the abrasion resistance of fabrics
by the Martindale method - Part 2: Determination of specimen breakdown
4.8 Color fastness to light
It is performed according to the provisions of GB/T 16991. The test conditions
adopt the condition 3 in clause 6.1; the test parameters are as follows:
- Black label thermometer temperature: (100 ± 3) °C;
- Test chamber temperature: (65 ± 3) °C;
- Relative humidity of the test chamber: (30 ± 5) %;
- Irradiation (under 420 nm): 1.2 W/m2;
- Light filter system: Borosilicate/soda lime.
4.9 Odor
4.9.1 Test device
- The thermostat with air circulation function, the accuracy of which is ± 2 °C;
- A glass container with a capacity of 1 L, with a gasket and a lid (no disturbing
odor).
4.9.2 Test procedure
4.9.2.1 Specimen
Take 3 specimens on the same piece: when the thickness of the specimen is
less than 3 mm, the size of the specimen is (200 ± 20) cm2. When the thickness
of the specimen is between 3 mm ~ 20 mm, the size of the specimen is (50 ±
5) cm3. When the thickness of the specimen is more than 20 mm, cut the
specimen downwards along the use side to the thickness of 20 mm.
Samples need to be offline for no more than 15 days; they need to be packed
in aluminum foil or polyethylene (PE) bags, and stored at room temperature and
protected from light.
4.9.2.2 Test
The sealed glass container in which the specimen is placed shall have no
peculiar smell at room temperature and 80 °C.
Place the three specimens in three 1 L glass sealed containers. Store them in
accordance with the test conditions in Table 4.
Appendix A
(Normative)
Required load elongation and residual distortion
A.1 Scope
This Appendix gives the test methods for the required load elongation and
residual distortion of automotive interior decoration textiles (including woven
fabrics, knitted fabrics, non-woven fabrics) and synthetic leather materials. It is
suitable for testing the required load elongation and residual distortion of
automotive interior decoration textiles (including woven fabrics, knitted fabrics,
non-woven fabrics) and synthetic leather materials under certain conditions.
A.2 Terms and definitions
The following terms and definitions apply to this appendix.
A.2.1
Required load elongation
The rate of change between the length of the specimen under constant time
and tension and the original length (before tension).
A.2.2
Residual distortion
The rate of change between the length of the specimen after a certain period
of unloading and the original length (before tension).
A.3 Test device
Required load extension frame (with fixtures, weights), or electronic tensile
machines that meet the test requirements can be used. The width of the clamp
shall be greater than 60 mm; the length measuring device has an accuracy of
1 mm.
A.4 Test procedure
A.4.1 Specimen preparation
For woven fabric specimen, take no less than 3 specimens along the warp and
weft directions, respectively, each specimen has a length of 200 mm and a
width of 55 mm. Remove the yarn equally from both sides of the specimen until
Appendix B
(Normative)
Determination of formaldehyde content
B.1 Scope
This Appendix gives the test method for the formaldehyde content of automotive
interior decoration textiles (including woven fabrics, knitted fabrics, non-woven
fabrics) and synthetic leather materials, which are applicable to the
determination of formaldehyde content in the automotive interior decorative
textiles (including woven fabrics, knitted fabrics, and non-woven fabrics),
synthetic leather materials.
B.2 Principle
Hang a specimen of a certain mass and size in a sealed polyethylene bottle
with a capacity of 1 L filled with distilled water. After being treated at a certain
temperature for a certain period of time, it is cooled; the amount of
formaldehyde as absorbed in distilled water is measured by acetylacetone
spectrophotometry (the measured formaldehyde shall be divided by the dry
weight of the specimen).
In an aqueous solution, formaldehyde reacts with acetylacetone and
ammonium ions to produce 3.5-diacetyl-1.4-dihydrolutidine. The product is
yellow, the absorption rate of which is maximum at 412 nm.
B.3 Test device
B.3.1 Electronic balance: The accuracy is 0.1 mg.
B.3.2 Incubator: The temperature shall be controlled from room temperature to
110 °C, with an accuracy of ±2 °C.
B.3.3 Spectrophotometer (wavelength 412 nm) and cuvette (1 cm) suitable for
the spectrophotometer.
B.3.4 Constant temperature water bath: It can maintain the temperature at (40
± 2) °C.
B.3.5 Drying dish.
B.3.6 Electric stove.
B.3.7 Polythene bottle (built-in steel hook, capacity 1 L): With a threaded
B.5 Calibration curve
B.5.1 Preparation of formaldehyde standard solution
Add 20 ml of formaldehyde standard solution, 25 ml of iodine solution and 10
ml of sodium hydroxide solution to a 250 ml conical flask and mix. After placing
it in the dark for 15 min, add 15 ml of sulfuric acid to the mixed solution. The
excess iodine is back-titrated by the use of sodium thiosulfate solution. At the
end of the titration, add a few drops of starch solution (to be heated and
dissolved by an electric furnace) as an indicator, to determine the volume of
sodium thiosulfate solution as consumed when the formaldehyde standard
solution is used for the test.
Mix 20 ml of distilled water, 25 ml of iodine solution, and 10 ml of sodium
hydroxide solution. After letting it stand for 15 min in the dark, add 15 ml of
sulfuric acid. The excess iodine is back-titrated by the sodium thiosulfate
solution. At the end of the titration, add a few drops of starch solution (to be
heated and dissolved by an electric furnace) as an indicator, to determine the
volume of sodium thiosulfate solution consumed in the blank test.
Use formula (B.1) to calculate the concentration of formaldehyde standard
solution:
Where:
c(HCHO) - The concentration of formaldehyde standard solution, mg/l;
V0 - The volume of sodium thiosulfate solution consumed during the blank
test, ml;
V - The volume of sodium thiosulfate solution consumed in the test by the
use of formaldehyde standard solution, ml;
c(Na2S2O3) - The concentration of sodium thiosulfate solution, mol/l.
B.5.2 Preparation of formaldehyde calibration solution
From the prepared formaldehyde standard solution, use a pipette to remove a
certain volume of formaldehyde standard solution into a 1000 ml volumetric
flask, which contains 15 mg of formaldehyde (this volume can be calculated
from the concentration of the formaldehyde standard solution that has been
accurately determined). Add distilled water to dilute to 1000 ml. The prepared
formaldehyde calibration solution contains 15 µg formaldehyde per ml.
B.5.3 Determination of calibration curve
Take six 100 ml volumetric flasks. From the formaldehyde calibration solution,
remove 5 ml, 10 ml, 20 ml, 50 ml, 100 ml in sequence. Pour them into a 100 ml
volumetric flask, including a 100 ml blank specimen bottle. Respectively add
distilled water to dilute it to 100 ml. The concentration of formaldehyde (µg/ml)
in these 6 volumetric flasks is 0, 0.75, 1.5, 3, 7.5, 15, respectively.
Take six 50 ml volumetric flasks. Use a pipette to remove 10 ml from each of
the six volumetric flasks for diluted formaldehyde calibration solution. Transfer
them into 50 ml volumetric flasks, respectively. The sampling sequence starts
with the lowest concentration. Pipette it from low to high. In this way, use pipette
to add 10 ml of acetylacetone solution and 10 ml of ammonium acetate solution
to each volumetric flask. Close the cap tightly, heat it in a 40 °C water bath for
15 minutes. Take out the 6 volumetric flasks. Cool it to room temperature (about
1 h) in the dark. Then use a spectrophotometer to measure the absorbance of
the solutions in these 6 volumetric flasks. Take the measured absorbance of
the formaldehyde calibration solution as the abscissa and the corresponding
concentration of the formaldehyde solution as the ordinate to make a curve.
The curve slope coefficient value is the correction factor f. Normally R2 > 0.995
means that the calibration slope is valid.
The calibration curve shall be checked once a month.
B.6 Test procedure
B.6.1 Specimen
Take 3 specimens with a length of 100 mm and a width of 40 mm, of which 1
specimen is used to determine the water content and 2 specimens are used to
determine the formaldehyde content. When sampling, ensure that the surface
of each specimen is free from contamination.
If the test of the specimen cannot be carried out immediately, it shall be stored
in a cool and sealed condition, wherein the amount of air shall be as small as
possible; the storage time shall not exceed 5 days.
B.6.2 Water content
Use an electronic balance to weigh the mass of the specimen m1 (accurate to
1 mg). Put the specimen in a constant temperature oven at (103 ± 2) °C for 24
hours. Take the specimen out and place it in a drying dish to cool to room
temperature. Then weigh the specimen mass m0. Calculate the water content
(%) according to formula (B.2):
Water content (H) = (m1 - m0) / m0 x 100% ... (B.2)
Appendix C
(Normative)
Determination of total carbon volatilization
C.1 Scope
This Appendix gives the determination method of total carbon volatile content
(TVOC) of automotive interior decoration textiles (including woven fabrics,
knitted fabrics, non-woven fabrics) and synthetic leather materials. It is suitable
for the determination of total carbon volatile content (TVOC) of automotive
interior decoration textiles (including woven fabrics, knitted fabrics, non-woven
fabrics), synthetic leather materials.
C.2 Principle
The headspace sampler is used to extract the residual volatile organic matter
in the specimen; the gas chromatography-hydrogen flame ionization detector
(GC-FID) is used to determine the total amount of carbon.
C.3 Test device and chemical reagents
C.3.1 Gas chromatograph: With split, splitless, injection port and hydrogen
flame ion detector (FID).
C.3.2 Headspace sample injection bottle (10 ml).
C.3.3 Capillary separation column: Inner diameter 0.25 mm, film thickness 0.25
µm, length 30 m, 100% polyethylene glycol stationary phase (Wax-type, such
as DB-Wax, Carbowax).
C.3.4 Electronic balance: Accuracy 0.1 mg.
C.3.5 Micro-injector: precision 5 µl.
C.3.6 Acetone: HPLC grade.
C.3.7 n-butanol: HPLC grade.
C.4 Test
C.4.1 Headspace sampler parameters
C.4.1.1 Temperature: Heating furnace 120 °C; quantitative tube 150 °C; transfer
tube 180.
carry out sample injection analysis.
C.4.4.2 Blank test
The blank value is determined by the average value of the signal values
obtained from at least 3 measurements by an empty sample bottle. The blank
value and the quantification of the calibration......
Related standard:   QC/T 216-2019  QC/T 293-2019
   
 
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