Contracting sheets

SHS-340 type shrink sheet is intended for the complete wrapping of weld heads in the field. The role of the sheet is to protect the weld from corrosion. The sheet is comprised from a cross-linked polyethylene and an internal layer made from a Butyl rubber based compound.

יריעות מתכווצות להגנה על ריתוכים

Technical information

Characteristics

  1. Excellent durability against corrosion, impact and penetration.
  2. Excellent durability against periodic changes in temperature, ground stress, hydrostatic pressure and chemical corrosion.
  3. Excellent durability against Cathodic Disbonding, microorganisms and bacteria.
  4. Easy application in all pipe diameters and suitable for repairs and for coating all types of accessories in the field.
  5. No expert workers are required for application. The sheet is applied within minutes by using a gas blowtorch

Uses

  1. Anti-corrosive protection of head connections of water and gas pipelines.
  2. Anti-corrosive protection of head connections of communication and electrical power supply pipelines.

Installation

  1. Clean the weld with a mechanical steel brush.
  2. Heat the welded area or the area designated for coating to a temperature of 60⁰
  3. Remove the protection sheet from the shrink sheet. Center the sheet to overlap the pipe’s coating from both sides of the weld.
  4. At first heat the patch sheet and attach it to the entire width of the shrink sheet.
  5. Heat using a gas blowtorch. Start heating from the weld, heat the perimeter around the pipe in order to shrink the sheet. Continue heating towards the edge of the sheet while making sure to release trapped air.
  6. Wait for complete cooling before touching the pipe.
Pipe DiameterPipe CircumferenceShrink Film
LengthOverlap LengthWidth
(")mmmmmmmm
2190290100450
3280380100
4359470111
6529640121
8688800121
10858970130
1210181130130
1411171250133
1612761420144
1814361590154600
2015951750155
2217551920165
2419142100186
2620742260186
2822332440207
3023932600207
3225522760208
3628713100229
4031903430240
PropertiesUnitsTypical ValueTest Method
Outer LayerShrinkage Rate%33 
Tensile StrengthKg/cm2320KSM 3006
Elongation%500KSM 3006
HardnessShore D>40KSM 3589
Water Absorption%0.03KSM 3027
Softening Point (Vicat)ºC105KSM 3076
Brittleness TemperatureºC<40-KSM 6676
Volume Electrical ResistivityΩ-cm2.1x1017ASTM D256
Thermal AgingTensile StrengthKg/cm2240KSM 3006
Elongation%520KSM 3006
Carbon Black ContentTGA %2.96 
Inner LayerAdhesionTo PE CoatingKg/25mm8.45ASTM D1000
To Steel PipeKg/25mm8.83ASTM D1000
Softening PointºC99ASTM E 28
Volume Electrical ResistivityΩ-cm2.8x1015ASTM D 257
Cold ResistanceºC<40-KSM 6676