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QC/T 15-1992

Chinese Standard: 'QC/T 15-1992'
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Detail Information of QC/T 15-1992; QC/T15-1992; QCT 15-1992; QCT15-1992
Description (Translated English): (Common test methods for automotive plastics)
Sector / Industry: Automobile & Vehicle Industry Standard (Recommended)
Classification of Chinese Standard: T05
Word Count Estimation: 21,000
Date of Issue: 21/5/1992
Date of Implementation: 1/6/1993
Quoted Standard: GB 209; GB 252; GB 435; GB 484; GB 534; GB 2918; GB 5671; JB 3979; QC/T 17; SY 4005
Adopted Standard: JASO M312-85, EQV
Drafting Organization: Changchun Automobile Research Institute of Materials
Administrative Organization: National Automotive Standardization Technical Committee
Regulation (derived from): Reform-Development-Office-Industry (2005) 743
Summary: This standard specifies test methods for generic automotive plastic molding products (hereinafter referred to as products) performance? This standard applies to cars with a variety of plastic products, but not for foam products? Cushions? Electroplating products? Coating products?

QC/T 15-92
QC
AUTOMOTIVE INDUSTRY STANDARD
OF THE PEOPLE’S REPUBLIC OF CHINA
T 05
General test methods for
automotive plastic products
汽车塑料制品通用试验方法
ISSUED ON. MAY 21, 1992
IMPLEMENTED ON. JUNE 1, 1993
Issued by. China Automotive Industry Corporation
Table of Contents
1 Subject contents and application scope ... 3 
2 Normative references ... 3 
3 Test items ... 3 
4 General test conditions ... 4 
5 Test methods ... 5 
6 Evaluation items ... 24 
7 Test report ... 26 
Additional explanations. ... 26 
General test methods for automotive plastic products
1 Subject contents and application scope
This Standard specifies the general test methods for automobile plastic molding products
(hereinafter referred as products).
This Standard is applicable to automobile plastic products but not to foaming products,
seats, electroplated products and coating products.
2 Normative references
GB 209 Sodium hydroxide for industrial use
GB 252 General diesel fuels
GB 435 Gasoline engine oil
GB 484 Vehicle used gasoline
GB 534 Industrial sulfuric acid
GB 2918 Plastics – Standard atmospheres for conditioning and testing
GB 5671 Lithium base grease for general purpose automobile
JB 3979 Test methods for automobile steering-wheel
QC/T 17 General rules for automative part weathering test
SY 4005 No.4604 synthetic brake oil
3 Test items
Test items include the 11 items as follows.
a. temperature resistance test;
b. weathering resistance test;
c. water resisting test;
d. wet resistance test;
e. chemical reagents resistance test;
f. vibration resistance test;
g. impact resistance test;
h. wear resistance test;
i. scratch resistance test;
j. rigidity test;
k. comprehensive test.
4 General test conditions
4.1 Standard environment conditions
The standard environment conditions are prescribed in GB 2918.
4.2 Specimen
The product which has been assembled and available for use can be used in a test as the
specimen. However, test piece which is simulative to the state of the product that is
actually used in an automobile can also be used if not affecting the properties of product.
4.3 Pre-treatment of specimen
The specimen, randomly selected from the products which have been placed for at least
24h since manufacturing, cannot undergo a test until being placed in the environmental
conditions as stipulated in 4.1 for no less than 4h or in other conditions agreed by supplier
and buyer if required.
4.4 Quantity of specimen
Unless otherwise specified, the quantity of specimen shall be in accordance with Table 1.
Table 1
Test purpose Quantity of specimen
Qualitative test At least 3
Quantitative test At least 5
the specimen submerged;
e. In principle, when the specimen is taken out from different environments for each
cycle, inspection shall be carried out according to the test items in article 6.
5.2 Weathering test
Weathering test shall be carried out in accordance with QC/T 17.
5.3 Water resisting test
Water resisting test is to examine the variation of product in water absorption when
directly contacting water during use.
Submerge the specimen which has been pre-treated in the standard environment as
stipulated in article 4.1 in the constant temperature test bath at 40±1°C or actually working
temperature for at least 200h. Take it out and wipe it clean with dry cleaning cloth. Then
put it in the standard environment for cooling for 1h. Conduct the inspection to the
specimen according to the test items in article 6. In principle, the water used in test shall
be >105Ω deionized water.
5.4 Wet resistance test
Wet resistance test is to examine the variation of product brought by moisture absorption.
5.4.1 Classification of test
Tests are classified into 3 types as shown in Table 8 according to the environmental
impact to the product.
Table 8
Test conditions
Test classification
Temperature
°C
Relative
humidity % Applicable scope
Type 1 70±2 Above 90 The product exposed at high temperature and high humidity conditions
Type 2 55±1 Above 95 General product Type 3 40±1 Above 90
5.4.2 Test methods
Pre-treat the specimen according to 4.3; then put it in the constant temperature and
humidity chamber as stipulated in article 8 for at least 96h. Take it out and wipe it clean
with the dry cleaning cloth. Put in the standard environment as stipulated in 4.1 for cooling
for 1h; examine the specimen according to the test items as stipulated in article 6.
5.5 Chemical medium resistance test
stipulated in Table 11. Examine the specimen according to the items as stipulated in
article 6.
Table 11
SN Cleaning method Drying method The placing time after drying (h)
1, 2, 3, 4, 8, 9, 10 Remove oil dirt with petroleum ether
Dry for 10 ~ 20min at 50°C or
lower constant temperature
chamber 1 5, 6, 7 Remove dirt with ethyl alcohol
11, 12, 13, 14 Wash with water instantly to make it not acid or alkaline
Dry for 2 ~ 3h at 50°C or lower
constant temperature chamber
5.5.3.3 Dropping test
a. Dropping test at room temperature
Use injector or gauze to spread the chemical medium as stipulated in Table 10 on
the surface of specimen at the standard environment. Place it for the prescribed
time duration; treat the specimen according to the method as stipulated in Table 11.
Examine the specimen according to the items as stipulated in article 6.
b. High temperature dropping test
Use injector or gauze to spread the chemical medium as stipulated in Table 10 on
the surface of specimen at the standard environment. Place it for the prescribed
time duration at the temperature as agreed by supplier and buyer. Cool it to room
temperature; treat the specimen according to the method as stipulated in Table 11.
Examine the specimen according to the items as stipulated in article 6.
5.6 Vibration resistance test
The purpose of this test is to examine the vibration resistance of product.
5.6.1 Classification of test
a. Resonance point determination test
Determine the resonance frequency and accelerated velocity of product which is
used to approximately evaluate or compare the dynamic rigidity of product.
b. Vibration endurance test
Examine the endurance of product to vibration.
5.6.2 Classification of vibration conditions.
The classification of vibration conditions is prescribed as follows.
5.6.2.1 The vibration conditions of specimen are classified into the following 4 types
according to the category of vehicle mounted with the product.
Type 1. car series mainly
Type 2. passenger car series mainly
Type 3. truck series mainly
Type 4. motorcycle series mainly
5.6.2.2 The vibration conditions of specimen are classified into the following 4 types
according to the place of product installed on a vehicle.
Type A. mounted on vehicle body or the position at the upper side of chassis spring
with less vibration
Type B. mounted on vehicle body or the position at the upper side of chassis spring
with more vibration
Type C. mounted on the part of engine with less vibration
Type D. mounted on the part of engine with more vibration
5.6.3 Test conditions
5.6.3.1 Test sequence
Firstly carry out resonance point determination test and then endurance test.
5.6.3.2 Specimen installation
The specimen which is close to use state is mounted on the vibration stand.
5.6.3.3 Vibration application method
Simple harmonic vibration in the up-to-down, left-to-right or back-to-forward quadrature
direction relative to the installation mode of specimen is applied successively but the
harmonic ratio of simple harmonic vibration should be 25% or less of vibration accelerated
velocity in principle.
5.6.3.4 Test temperature
The test temperature shall be set as standard temperature of 23±5°C in principle.
5.6.4 Test methods
5.6.4.1 Resonance point determination test
Table 13
Harm
onic
Frequency
Hz
Vibration
Acceleration
m/s2
Category 1 Category 2 Category 3 Category 4
A B C D A B C D A B C D A B C D
2 33 or 67 22 ○ ○
3 33 or 67 32 ○ ○ ○ ○
4 33 or 67 43 ○ ○ ○ ○ ○
7 33 or 67 67 ○ ○ ○ ○ ○
9 33, 67or 133 87 ○ ○ ○ ○
11 67 or 167 111 ○
Table 14
Harmonic Frequency Hz
Vibration
Acceleration
m/s2
Vibration time h
Up ......
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