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Stress Control and Insulation Tubes

C106 Tri Layer Heat Shrink Tube for Medium Voltage Joints

Ultra heavy wall tube combining semiconductive screen plastic insulation and a fast recovering elastomeric inner layer

  • Operating temperature: -55 to 105°C
  • Minimum fully recovery temperature: 150°C
  • Voltage class: 6kV ~ 36kV
  • Halogen-free, RoHS compliant, Ultra heavy wall
  • Semi-conductive / insulation / Elastomeric Insulation Three-layer
  • Standard Color: Black (outer layer) / Red (inner layer)
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C106 Tri Layer Heat Shrink Tube for Medium Voltage Joints manufactured by UPM Heat Shrink

C106  ·  Stress Control and Insulation Tubes

Product Overview

What C106 Does

Co-extrusion design,semi-conductive/insulation/elastomeric insulation tri-layer heat shrink tube.The elastomeric layer is designed to have a fast shrinkage rate to avoid overheating damage.Suitable for insulation protection of power cable joint under 36kV.

Ultra heavy wall tube combining semiconductive screen plastic insulation and a fast recovering elastomeric inner layer It is manufactured by Dalian United Polymer Material Co., Ltd. in Dalian China where radiation cross linking extrusion and molding are all performed in house under one quality system.

Key Benefits

  • The full joint insulation build in a single shrink operation
  • An inner elastomeric layer that recovers quickly and conforms tightly to the connector profile
  • Middle plastic insulation with dielectric strength of 15 kV/mm or higher and volume resistivity of 1.0×10¹³ Ω·cm or higher
  • Outer semiconductive screen at 1.0×10⁴ Ω·cm or below for genuine screen function
  • Nine sizes from 35/13 mm to 125/62 mm covering the full MV joint range

Who It Is For

Who Benefits Most from C106

The buyers and site teams this product was designed around

35 kV Joint Kit Manufacturers

At the top of the MV range the joint insulation wall has to be thick and the build has to stay fast.

Utility Jointing Crews on Critical Feeders

Joints on high load feeders where a rebuild means an extended outage.

Contractors Working in Confined Chambers

A single tube that delivers 11 to 14 mm of wall removes several separate shrink operations in a manhole.

Industrial Plants with Heavy Through Fault Duty

Sites where joints are exposed to repeated short circuit forces and thermal cycling.

Problems It Solves

Problems This Product Removes

Every one of these is a failure mode we have seen on real networks

Thick Walls Overheat Before the Outside Recovers

The elastomeric inner layer is formulated for a fast shrinkage rate so the inside conforms before the outer surface takes excessive heat.

Three Separate Tubes Triples the Void Risk

One co extruded wall carrying all three functions removes two manufactured on site interfaces.

35 kV Joints Need Real Insulation Thickness

Recovered wall from 11 to 14 mm delivers the insulation build that a 26/35 kV joint requires.

Elastomeric Layers Usually Mean Weak Mechanical Properties

The inner elastomeric layer holds tensile strength of 6 MPa or above and elongation of 270 percent or above while still shrinking quickly.

Application Scenarios

Where It Is Used

26/35 kV Straight Through Joints

The primary insulation build in a 35 kV joint kit.

15 kV Heavy Duty Joints

Feeder joints where extra insulation margin is specified.

Transition Joints Between Cable Types

Joining paper insulated and XLPE cable where insulation thickness differs.

Repair Joints on Damaged Feeders

Emergency rebuild where installation time matters.

Offshore and Marine Cable Joints

Joints exposed to moisture and mechanical movement.

Technical Data

Specifications and Dimensions

Test methods and requirements taken directly from the manufacturing specification

Technical Data

PropertyTest MethodRequirement
Outer Layer (Semi-Conductive, Black)
Tensile StrengthASTM D2671≥12 MPa
Ultimate ElongationASTM D2671≥270%
Heat Aging (158°C/168h) Tensile Strength Ultimate ElongationASTM D2671≥10 MPa ≥250%
Water absorption (23°C/24h)ASTM D2671≤0.5%
Low-temperature flexibility (-40°C/4h)ASTM D2671No cracking
Heat shock (200°C/4h)ASTM D2671No dripping or flowing
Volume resistivityASTM D2671≤1.0×104 Ω·cm
Middle Layer (Plastic Insulation, red)
Tensile StrengthASTM D2671≥12 MPa
Ultimate ElongationASTM D2671≥350%
Heat Aging (136°C/168h) Tensile Strength Ultimate ElongationASTM D2671≥10 MPa ≥270%
Water absorption (23°C/24h)ASTM D2671≤0.5%
Low-temperature flexibility (-40°C/4h)ASTM D2671No cracking
Heat shock (200°C/4h)ASTM D2671No dripping or flowing
Dielectric strengthASTM D2671≥15 kV/mm
Volume resistivityASTM D2671≥1.0×1013 Ω·cm
Inner Layer (/Elastomeric Insulation, red)
Tensile StrengthASTM D2671≥6 MPa
Ultimate ElongationASTM D2671≥270%
Heat Aging (136°C/168h) Tensile Strength Ultimate ElongationASTM D2671≥4.2 MPa ≥200%
Water absorption (23°C/24h)ASTM D2671≤0.5%
Low-temperature flexibility (-40°C/4h)ASTM D2671No cracking
Heat shock (200°C/4h)ASTM D2671No dripping or flowing
Dielectric strengthASTM D2671≥15 kV/mm
Volume resistivityASTM D2671≥1.0×1013 Ω·cm
Note: Use standard samples for testing

Dimensions

Size C106As supplied(mm) Inner diameter D (min.)After recovered (mm) Inner diameter d (max.)Wall thickness t (nom.)Standard length (m/pcs)
35/13351311≤1.22
45/17451712≤1.22
50/21502112≤1.22
63/26632612.5≤1.22
75/34753412.5≤1.22
85/34853412.5≤1.22
95/42954213.5≤1.22
110/521105213.5≤1.22
125/621256214≤1.22
C106 construction and dimension diagram
C106 as supplied and fully recovered dimensions. D is the supplied inner diameter d is the recovered inner diameter and t is the recovered wall thickness.

CROSS REFERENCE  ·  Tyco-Raychem: ERIT/ERIC/ERIH

Manufacturing and Quality

How It Is Made and Checked

Compounding extrusion radiation cross linking expansion and test all under one roof in Dalian

  1. 01

    Compounding

    Base polyolefin antioxidants flame retardants and functional fillers are mixed to a recipe held under our own formulation control rather than bought as a masterbatch.

  2. 02

    Extrusion

    The compound is extruded to the required wall and diameter. Co extruded products form two or three layers in a single pass so no interface can trap air.

  3. 03

    Radiation Cross Linking

    Electron beam irradiation creates the cross linked network that gives the material its shape memory. This step is what makes the product heat shrinkable.

  4. 04

    Expansion

    The cross linked part is heated expanded to its supplied diameter and cooled under tension so the expanded shape is locked in until heat is applied again.

  5. 05

    Test and Inspection

    More than 90 percent of product performance tests are carried out in our own laboratory including tensile elongation heat aging dielectric strength and tracking resistance.

  6. 06

    Packing and Traceability

    Each batch carries a production record so a delivered part can be traced back to its compound lot and process parameters.

Extrusion and irradiation workshop at the UPM Heat Shrink factory in Dalian China
Extrusion and processing workshop in Dalian. Line side inspection stations let an operator check wall thickness and concentricity without stopping the run.

Certification

ISO 9001:2015

Quality management system

IATF 16949:2016

Automotive quality management

ISO 14001:2015

Environmental management

ISO 45001:2018

Occupational health and safety

GJB 9001C-2017

Defence quality management

UL 224 E341796

Extruded insulating tubing

CE / RoHS

European conformity and restricted substances

CCS / ABS / DNV

Marine classification society approvals

Comparison

How C106 Compares

An honest comparison so you can rule this product in or out quickly

ProductLayersRecovered WallRecovery Temperature
C105Semiconductive and insulation5 to 6.3 mm135 °C
C106Semiconductive insulation and elastomeric11 to 14 mm150 °C
C107Plastic and elastomeric insulationSee datasheet150 °C

Use Guide

How to Select and Install C106

The sequence our engineers walk customers through on every first installation

  1. 01

    Park the Tube Early

    Slide the tube onto the cable before the connector is crimped. An 11 to 14 mm wall tube cannot be fitted after the joint is made.

  2. 02

    Check Size Against the Connector

    Supplied diameter D must clear the connector. Recovered diameter d must be smaller than the cable core so the tube grips.

  3. 03

    Centre and Mark

    Mark equal overlap on both sides of the connector before applying heat.

  4. 04

    Heat Patiently from the Centre

    Full recovery needs 150 °C. Work outward from the centre with a broad soft flame and keep it moving. A thick wall takes several minutes.

  5. 05

    Watch the Inner Layer Conform

    The elastomeric inner layer shrinks first and pulls tight against the connector shoulders which is what removes voids.

  6. 06

    Restore Screen and Seal

    Apply braid springs and an outer adhesive lined tube to complete the joint.

FAQ

C106 Frequently Asked Questions

The questions buyers ask before they place an order

Why does C106 need three layers
The outer semiconductive layer restores the cable screen the middle plastic layer provides the bulk insulation and the inner elastomeric layer conforms quickly and tightly around the connector so no void is left at the highest stress point.
What is the advantage of the elastomeric inner layer
It has a faster shrinkage rate than the plastic layers so it conforms before the outside of the tube has absorbed excessive heat. That avoids overheating damage on a very thick wall.
Is C106 equivalent to Raychem ERIT ERIC and ERIH
C106 is designed as a functional equivalent to that family. Confirm the specific size and wall against your approved design before substituting.
What is the maximum recovered wall thickness
14 mm on the 125/62 size. The range starts at 11 mm on the 35/13 size.
Can it be used at 6 kV
Yes. The voltage range is 6 kV to 36 kV although at 6 kV the wall is normally more than required and C105 is the economic choice.
How long is each piece
Standard length is up to 1.22 m which covers normal MV joint build lengths.

Still need an answer ask our engineers on WhatsApp

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