The usual PE heat shrink tubing is loved by various industries due to its low price, complete specifications, and rich colors. However, in some special environments, ordinary PE heat shrink tubing cannot meet the performance requirements due to its material properties, especially in applications that require long-term high temperature resistance. This requires the use of truly high temperature resistant heat shrink tubing. Which ones belong to truly high temperature resistant heat shrink tubing? Next, we will introduce a type of heat shrink tubing that can truly withstand temperatures of 150 ℃ and 175 ℃ for a long time - fluoroplastic (PVDF) heat shrink tubing (also known as polyvinylidene fluoride heat shrink tubing, strictly speaking, PVDF heat shrink tubing is just one type of fluoroplastic heat shrink tubing).
1、Application mechanism of fluoroplastic heat shrink tubing:
The high bond energy of carbon fluorine bonds is the basis for fluororesins to be used as high weather resistant coatings, The C-F bond energy (451485KJ/m "l)>51" bond energy (422 centers/m "l)>C-si bond energy (318KJ/mol)" The ultraviolet wavelength in sunlight is 220-400nln, and the photon energy at 220nln wavelength is 544 centers/mol. Only photons less than 22nln can break the C-F bond of fluoropolymers. "The proportion of photons less than 220nln in sunlight is very small, and sunlight has almost no effect on fluoropolymers. Therefore, fluoropolymer coatings with high weather resistance have been developed for more than 40 years." Fluoropolymers also have extremely high chemical stability, and fluorine atoms have electronegativity. The small atomic radius, high fluorocarbon bond energy, strong repulsion of fluorine atoms on the carbon chain, spiral structure of the carbon chain surrounded by fluorine atoms, and shielding effect determine the extremely high chemical stability of fluoropolymers.
2、Performance characteristics of fluoroplastic heat shrink tubing:
● Thin wall
● Sturdy and semi hard
● Friction resistant
● Cut resistant
● Chemical and oil corrosion resistance
● Chemical corrosion resistance
● High temperature resistance
● Oxidation resistance
● Weather resistance
● Radiation resistance performance
● Voltage resistance
● Dielectric properties
Thermoelectric properties
3、Application of fluoroplastic heat shrink tubing:
Widely used for the protection of welding points, terminals, and connecting cables that are susceptible to high temperatures, industrial fuels, solvents, and chemical reagents, as well as in aerospace, military, medical, high-temperature and chemical resistant environments. Such as sensors, special wiring harnesses, headphones, automotive wiring harnesses, LED lights, engines, and so on.
4、Color of fluoroplastic heat shrink tubing:
● Transparent
● Black
5、Performance parameters of fluoroplastic heat shrink tubing:
|
Project
|
Testing method
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Typical data
|
|
Working temperature
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IEC 216
|
-55 ℃ to+150 ℃
|
|
Tensile strength
|
ASTM D 2671
|
＞34.5Mpa
|
|
Elongation at break
|
ASTM D 2671
|
＞300%
|
|
Thermal aging elongation at break
|
250 ℃, 168 hours
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＞200%
|
|
Thermal shock
|
300 ℃, 1 hour
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Not cracked
|
|
Cold bending test
|
-55 ℃, 1 hour
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Not cracked
|
|
Electric breakdown strength
|
ASTM D 2671
|
＞30KV/mm
|
|
Volume resistivity
|
ASTM D 876
|
＞1014Ω.cm
|
|
Flame retardancy
|
VW-1
|
By
|
6、 Specification and model of fluoroplastic heat shrink tubing:
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Specification for 150 ℃ Fluoroplastic Heat Shrinkable Pipe
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|
Specification
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Before contraction
|
After contraction
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Shape
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Standard length (meters/disc)
|
|
Inches
|
Millimeter
|
Small inner diameter (mm)
|
Large inner diameter (mm)
|
Normal wall thickness (mm)
|
|
3/64
|
1.2
|
1.2
|
0.60
|
0.25±0.05
|
○
|
200
|
|
1/16
|
1.6
|
1.6
|
0.80
|
0.25±0.05
|
○
|
200
|
|
3/32
|
2.4
|
2.4
|
1.20
|
0.25±0.04
|
○
|
200
|
|
1/8
|
3.2
|
3.2
|
1.60
|
0.25±0.04
|
○
|
100
|
|
3/16
|
4.8
|
4.8
|
2.40
|
0.25±0.04
|
○
|
100
|
|
1/4
|
6.4
|
6.4
|
3.20
|
0.30±0.05
|
○
|
100
|
|
3/8
|
9.5
|
9.5
|
4.80
|
0.30±0.05
|
－
|
50
|
|
1/2
|
12.7
|
12.7
|
6.40
|
0.30±0.05
|
－
|
50
|
|
3/4
|
19.1
|
19.1
|
9.50
|
0.43±0.07
|
－
|
50
|
|
1
|
25.4
|
25.4
|
12.70
|
0.48±0.07
|
－
|
50
|
|
11/2
|
38.1
|
38.1
|
19
|
0.51±0.07
|
－
|
30
|
|
Specification for 175 ℃ Fluoroplastic Heat Shrinkable Pipe
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|
Specification
|
Before contraction
|
After contraction
|
Shape
|
Standard length (meters/disc)
|
|
Inches
|
Millimeter
|
Small inner diameter (mm)
|
Large inner diameter (mm)
|
Normal wall thickness (mm)
|
|
3/64
|
1.2
|
1.2
|
0.60
|
0.20
|
200
|
3/64
|
|
1/16
|
1.6
|
1.6
|
0.80
|
0.20
|
200
|
1/16
|
|
3/32
|
2.4
|
2.4
|
1.20
|
0.23
|
200
|
3/32
|
|
1/8
|
3.2
|
3.2
|
1.60
|
0.23
|
100
|
1/8
|
|
3/16
|
4.8
|
4.8
|
2.40
|
0.23
|
100
|
3/16
|
|
1/4
|
6.4
|
6.4
|
3.20
|
0.28
|
1.22
|
1/4
|
|
3/8
|
9.5
|
9.5
|
4.80
|
0.28
|
1.22
|
3/8
|
|
1/2
|
12.7
|
12.7
|
6.40
|
0.30±0.05
|
－
|
50
|
|
3/4
|
19.1
|
19.1
|
9.50
|
0.43±0.07
|
－
|
50
|
|
1
|
25.4
|
25.4
|
12.70
|
0.48±0.07
|
－
|
50
|
|
11/2
|
38.1
|
38.1
|
19
|
0.51±0.07
|
－
|
30
|
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