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QC/T 1045-2016: PDF in English (QCT 1045-2016) QC/T 1045-2016
QC
AUTOMOBILE INDUSTRY STANDARD
OF THE PEOPLE’S REPUBLIC OF CHINA
ICS 43.040.60
T 20
Heat-shrinkable pipe
ISSUED ON. APRIL 5, 2016
IMPLEMENTED ON. SEPTEMBER 1, 2016
Issued by. Ministry of Industry and Information Technology of the
People's Republic of China
Table of Contents
Announcement ... 3
of Ministry of Industry and Information Technology of the People's Republic of
China ... 3
No.17, 2016 ... 3
Foreword ... 8
1 Scope ... 9
2 Normative references ... 9
3 Requirements ... 9
4 Test methods ... 11
5 Inspection rules ... 16
6 Marks, packaging, transport and storage ... 17
Heat-shrinkable tubing for automotive pipe
1 Scope
This Standard specifies the requirements, test methods, inspection rules and
marks of heat-shrinkable tubing for automotive pipe.
This Standard is applicable to heat-shrinkable tubing for automotive pipe.
2 Normative references
The following referenced documents are indispensable for the application of
this document. For dated references, only the edition cited applies. For undated
references, the latest edition of the referenced document (including any
amendments) applies.
GB 209-2006, Sodium hydroxide for industrial use
GB/T 534-2002, Sulphuric acid for industrial use
GB/T 1842-2008, Plastics - Test method for environmental stress-cracking of
polyethylene
GB/T 2423.22-2012, Environmental testing - Part 2. Tests methods - Test N.
Change of temperature
GB/T 7113.2-2014, Flexible insulating sleeving - Part 2. Methods of test
GB 12981-2012, Motor vehicle brake fluids
GB 17930-2011, Gasoline for motor vehicles
3 Requirements
3.1 General requirements
3.1.1 Specifications.
Heat-shrinkable tubing for automotive pipe is divided into single wall tubing and
double wall tubing. Single wall tubing has a maximum operating temperature of
105°C. Double wall tubing has a maximum operating temperature of 125°C.
The double wall tubing is composed of an inner wall (hot melt adhesive) and an
outer wall (heat shrinkable material).
after shrinkage as described above.
4.4 Wall thickness and concentricity
Measure the wall thickness with a thickness gauge with an accuracy of 0.01
mm. First lift the pressure column, carefully place the specimen on the pressure
pin, and then release the pressure column. The pressure column is pressed
against the pressure pin with a force of (0.25±0.02) N. Read the wall thickness
value. Measure at least 10 times at different locations to find the maximum wall
thickness M1 and the minimum wall thickness M2.
Place the specimen in an aging chamber heated to (150±2)°C. After (600±5) s
non-limiting shrinkage, the maximum wall thickness and minimum wall
thickness of the specimen after shrinkage shall be measured as described
above.
Calculate the concentricity according to formula (1).
where,
Ec - concentricity value;
M2 - minimum wall thickness, mm;
M1 - maximum wall thickness, mm.
4.5 Longitudinal shrinkage
Measure the length of the specimen before shrinkage L1 and the length of the
specimen after shrinkage L2 using a steel ruler with a precision of 1 mm or other
measuring tools of the same precision. The shrinkage condition is. place the
specimen in a (150±2)°C aging oven, and perform (600±5) s non-limiting
shrinkage.
Calculate the longitudinal shrinkage according to formula (2).
where,
LC - longitudinal shrinkage;
L2 - specimen length after shrinkage, mm;
The fluid resistance is in accordance with Clause 37 of GB/T 7113.2-2014. Take
a 100mm long specimen. Assemble it to a metal tube whose outer diameter
corresponds to its specification. Remove after heating (260±5) s in an oven
heated to (150±5)°C. Bend according to Figure 2. The outer diameter and
bending radius of the metal tube shall comply with the requirements of Table 4.
Then immerse in the following fluids. Fluid temperature is (25±2)°C. Take out
after 72 h. Observe whether the specimen is slack.
- 1/10N H2SO4 (shall comply with GB/T 534-2002);
- 1/10N NaOH (shall comply with GB 209-2006);
- Brake fluid (shall comply with GB 12981-2012);
- Gasoline (shall comply with GB 17930-2011).
5 Inspection rules
5.1 Sampling method and determination of rejection
The products shipped to the same user at one time shall be one batch, in
batches with minimum packaging. Each batch of products shall be randomly
sampled according to Table 5. If the user deems it necessary, determine the
sample size of each batch according to the agreement between the parties. If
the performance is unqualified, the unqualified performance shall be doubled
and sampled again. If it is still unqualified, this batch of products shall be
rejected.
Table 5 -- Sampling amount and determination of rejection
Batch product number >500 500~301 300~101 ≤100
Number of specimen 8 6 4 2
Number of rejection 0 0 0 0
5.2 Exit-factory inspection
Before the product leaves the factory, the manufacturer shall carry out the exit-
factory inspection according to the test methods of 4.2 and 4.3. The exit-factory
inspection shall meet the requirements of 3.1.
5.3 Type test
When any of the following conditions occurs, the type test shall be carried out
in accordance with all test methods of 4.2 to 4.12. Type test shall meet the
requirements of 3.2.
- trial model identification for new product;
......
Source: Above contents are excerpted from the PDF -- translated/reviewed by: www.chinesestandard.net / Wayne Zheng et al.
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