Medium and Heavy Wall Tubing

S3 Medium Wall Flame Retardant Heat Shrink Tube

Flame retardant medium wall tubing formulated for wet and underground service on vessels platforms shipyards and harbours

Operating temperature: -55 to 110°C
Minimum fully recovery temperature: 135°C
Shrink ratio: 3:1 & 4:1
Environmental friendly, RoHS compliant, Flame-retardant
Single or Dual wall optional
Standard Color: Black, Other colors optional

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S3 Medium Wall Flame Retardant Heat Shrink Tube manufactured by UPM Heat Shrink

S3 · Medium and Heavy Wall Tubing

Product Overview

What S3 Does

Medium wall flame-retardant polyolefin shrink tubing,with or without adhesive liner.Excellent insulation,mechanical protection and sealing for outdoor electrical equipment and connections in wet and underground environments such as marine vessels,off-shore oil platform,shipyard and harbor applications.

Flame retardant medium wall tubing formulated for wet and underground service on vessels platforms shipyards and harbours 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

A flame retardant formulation validated for wet and underground service
135 °C recovery temperature which gives a wider processing margin in windy outdoor conditions
3:1 and 4:1 ratios covering a wide diameter span
Single wall or adhesive lined dual wall for sealed marine positions
Environmentally friendly and RoHS compliant

Who It Is For

Who Benefits Most from S3

The buyers and site teams this product was designed around

Shipyards and Marine Electrical Contractors

Cable connections on vessels sit in salt laden humid air and must be flame retardant.

Offshore Oil and Gas Operators

Platform cabling faces salt spray hydrocarbon exposure and strict fire requirements.

Harbour and Port Authorities

Quayside power cabling in a constantly wet salt environment.

Underground Utility Contractors

Direct buried and duct installations where the position stays wet.

Problems It Solves

Problems This Product Removes

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

Marine Environments Destroy Ordinary Tubing

Continuous salt exposure plus UV plus humidity attacks the polymer. The S3 formulation is built for that duty.

Fire Performance Is Regulated on Vessels

Classification society rules require flame retardant materials in cable systems on ships and platforms.

Wet Underground Positions Never Dry Out

A tube that absorbs water loses dielectric strength. Water absorption is held low by the formulation.

Cold Weather Cracking on Deck

Low temperature flexibility down to -55 °C in service means the tube does not crack on a winter deck.

Application Scenarios

Where It Is Used

Vessel Cable Connections

Power and control cable joints and terminations on ships.

Offshore Platform Cabling

Deck and module cabling exposed to salt spray.

Shipyard Temporary and Permanent Power

Yard distribution in a wet salt environment.

Harbour and Quayside Power

Shore supply and crane cabling.

Underground and Duct Installations

Wet buried positions on land.

Technical Data

Specifications and Dimensions

Test methods and requirements taken directly from the manufacturing specification

Technical Data

Property	Test Method	Requirement
Tensile Strength	ASTM D2671	≥10.4 MPa
Ultimate Elongation	ASTM D2671	≥300%
Heat Aging (158°C/168h) Tensile Strength Ultimate Elongation	ASTM D2671	≥7.3 MPa ≥200%
Water absorption (23°C/24h)	ASTM D2671	≤0.5%
Low-temperature flexibility (-55°C/4h)	ASTM D2671	No cracking
Heat shock (200°C/4h)	ASTM D2671	No cracking, dripping or flowing
Dielectric strength	ASTM D2671	≥15 kV/mm
Volume resistivity	ASTM D2671	≥1.0×1014Ω·cm
Flammability	UL224	VW-1

Dimensions

Size S3	As supplied(mm) Inner diameter D (min.)	After recovered (mm) Inner diameter d (max.)	Wall thickness t (nom.)	Standard length (m)
8/2	8	2	1.7(with glue)	1.0/1.22
9/3	9	3	1.8(with glue)	1.0/1.22
12/4	12	4	2.2(with glue)	1.0/1.22
16/5	16	5	2.5(with glue)	1.0/1.22
19/6	19	6	2.4	1.0/1.22
22/6	22	6	2.4	1.0/1.22
25/8	25	8	2.5	1.0/1.22
28/6	28	6	2.9	1.0/1.22
33/8	33	8	2.9	1.0/1.22
35/12	35	12	2.6	1.0/1.22
40/12	40	12	2.7	1.0/1.22
45/13	45	13	2.8	1.0/1.22
55/16	54	16	2.9	1.0/1.22
65/19	65	19	2.9	1.0/1.22
75/22	75	22	2.9	1.0/1.22
85/25	85	25	2.9	1.0/1.22
95/25	95	25	3.3	1.0/1.22
115/34	115	34	3.3	1.0/1.22
130/36	130	36	3.4	1.0/1.22
140/42	140	42	3.4	1.0/1.22
160/50	160	50	3.5	1.0/1.22
175/58	175	58	3.5	1.0/1.22
200/65	200	65	3.6	1.0/1.22
230/75	230	75	3.6	1.0/1.22
260/85	260	85	3.6	1.0/1.22

S3 construction and dimension diagram — S3 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: BSTS-FR/SST-FR

Manufacturing and Quality

How It Is Made and Checked

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

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.
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.
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.
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.
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.
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 S3 Compares

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

Environment	Recommended Product	Reason
Tunnel metro building	S3(n) or S3(nh)	Halogen free smoke requirement
Vessel platform harbour	S3 or S3(h)	Flame retardant and wet service formulation
Buried and duct	S3(nh) or S3(h)	Heavy wall mechanical protection
Dry indoor enclosure	S3(n)	Lowest cost adequate performance

Use Guide

How to Select and Install S3

The sequence our engineers walk customers through on every first installation

01
Confirm the Fire Specification

Marine and offshore work is normally specified flame retardant. Enclosed public routes are normally specified halogen free. Check which applies before ordering.
02
Choose Adhesive Lined for Wet Positions

Any marine or buried position should use the adhesive lined version.
03
Size for the Diameter Span

3:1 and 4:1 ratios let one size cover a wide range. Measure the largest and smallest points.
04
Prepare a Salt Contaminated Surface Properly

Wash off salt deposits and dry the surface before wiping with solvent or the adhesive will not bond.
05
Allow for 135 °C Recovery

The recovery temperature is higher than the halogen free grades. Allow a little more heat time.
06
Verify the Seal

A continuous adhesive bead at both ends is essential in a marine position.

FAQ

S3 Frequently Asked Questions

The questions buyers ask before they place an order

What is the difference between flame retardant and halogen free

Flame retardant means the material resists ignition and self extinguishes. Halogen free means it releases no corrosive halide gas when it does burn. Marine rules usually specify flame retardant and enclosed public routes usually specify halogen free.

Is S3 approved by classification societies

UPM materials hold CCS ABS and DNV approvals across the product range. Tell us the exact vessel specification and we will confirm which certificate applies to your part number.

Can it be used underground on land

Yes. The formulation is specified for wet and underground environments as well as marine positions.

Why is the recovery temperature higher than S3(n)

The flame retardant formulation crystallises at a higher temperature. In practice it gives a wider working margin in windy outdoor conditions where a lower temperature tube can start to recover too early.

What is the low temperature limit

Service temperature runs to -55 °C. The low temperature flexibility test is performed at -40 °C for 4 hours with no cracking.

Are other colours available

Black is standard and other colours are available on a production run.

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