RST series thermal contraction sleeve, also known as , is made of radiation crosslinking polyvinyl backing material compounded with hot-melt adhesive. It is one of our thermal contraction products and can restore to original state naturally when heated.
Ⅰ. Characteristics:
1. Easy to operate and high safe work efficiency.
2. Hot-melt adhesive has a strong bonding ability with various anticorrosion layers. It has good airtightness, imperviousness to water and air and restoration ability.
3. It is characterized by good mechanical strength, thermal antioxidation, corrosion prevention, environment stress cracking resistance and long service life.
Ⅱ. Major technical indexes:
|
Serial number
|
Item
|
Unit
|
Index
|
Testing method
|
|
1
|
Tensile strength
|
Mpa
|
≥17
|
GB1040
|
|
2
|
Breaking elongation
|
%
|
≥400
|
GB1040
|
|
3
|
Vicat softening point
|
℃
|
≥90
|
GB/T1633
|
|
4
|
Brittleness temperature
|
℃
|
＜-65
|
GB/T5470
|
|
5
|
Environment stress cracking resistance time
|
（F50）(h)
|
＞1000
|
GB/T1842
|
|
6
|
Breakdown strength resistance
|
MV/m
|
≥25
|
GB/T1408
|
|
7
|
Volume resistivity
|
.m
|
＞1×10
|
GB/T1410
|
|
8
|
Environment stress cracking resistance（F50）h
|
|
≥1000
|
GB/T1842
|
|
8
|
Chemical mediator corrosion prevention
|
（Immersed 7d）（%）
|
|
10% HCL
|
%
|
≥85
|
SY/T0413-95附录C
|
|
10%NaOH
|
%
|
≥85
|
|
3%Nacl
|
%
|
≥85
|
|
9
|
Thermal antioxidation
|
（150℃）(%)
|
|
Tensile strength
|
Mpa
|
≥14
|
GB/T1040
|
|
Breaking elongation
|
%
|
≥300
|
GB/T1040
|
|
10
|
Peeling strength
|
N/cm
|
|
For undercoated steel pipes
|
N/cm
|
≥70
|
GB/T2792
|
|
For polyvinyl layer
|
N/cm
|
≥40
|
GB/T2792
|
Ⅲ. Major usage:
widely applied for the exterior anticorrosion, crack repair and defect repair of the pipes in such industries as petroleum and natural gas transmission, communications, electric power, chemical, etc.
|
