Insulation Comparison Guide - Jinda Cable Group

Technical Reference

Cable Insulation Material
Comparison Guide

Selecting the correct insulation material is critical to cable performance, safety, and service life. This guide compares the five most widely specified insulation systems -- PVC, XLPE, EPR, Rubber, and LSZH -- across key electrical, thermal, and environmental parameters to support informed engineering procurement decisions.

Excellent

Good

Fair

Limited

Property	PVC Polyvinyl Chloride	XLPE Cross-linked Polyethylene	EPR Ethylene Propylene Rubber	Rubber Natural / Synthetic	LSZH Low Smoke Zero Halogen
Max. Operating Temp. Continuous conductor	70°C	90°C	90°C	60-85°C	70-90°C
Short-Circuit Temp. Max. 5 seconds	160°C	250°C	250°C	200°C	200°C
Dielectric Strength Electrical insulation	Good	Excellent	Excellent	Good	Good
Moisture Resistance Water / humidity	Good	Excellent	Good	Fair	Good
Oil / Chemical Resistance Petrochemical exposure	Good	Good	Excellent	Fair	Good
Flame Retardancy Fire performance	Good	Fair	Fair	Limited	Excellent
Low Smoke / Halogen-Free Enclosed space safety	Limited	Fair	Fair	Limited	Excellent
Flexibility Installation & movement	Good	Fair	Good	Excellent	Good
UV / Ozone Resistance Outdoor exposure	Fair	Good	Excellent	Fair	Good
Relative Cost Material cost index	Low	Medium	Medium-High	Medium	Medium-High
Typical Voltage Range Standard application	Up to 1kV	0.6/1kV - 35kV	Up to 35kV	Up to 1kV	Up to 1kV
Key Standards Common specifications	IEC 60502 GB/T 12706 BS 6004	IEC 60502 GB/T 12706 BS 6622	IEC 60502 BS 6622 IEEE 1202	IEC 60245 GB/T 5013 H07RN-F	IEC 60332 EN 50525 EN 45545-2

* Performance ratings are indicative for standard formulations. Specific compound grades and additives may alter performance characteristics. Contact Jinda technical team for application-specific recommendations.

Insulation Type 01

PVC

Polyvinyl Chloride

Max. Conductor Temp.: 70°C continuous / 160°C short-circuit
Dielectric Constant (εr): 4.0 - 8.0
Tensile Strength: ≥ 10 MPa
Key Strengths: Cost-effective, flame retardant, easy to process, wide availability. Industry standard for LV general wiring.
Limitations: Emits toxic HCl gas when burned. Not suitable for high-temperature or medium-voltage applications.

Insulation Type 02

XLPE

Cross-linked Polyethylene

Max. Conductor Temp.: 90°C continuous / 250°C short-circuit
Dielectric Constant (εr): 2.3 - 2.5
Tensile Strength: ≥ 12.5 MPa
Key Strengths: Superior electrical properties, high current-carrying capacity, excellent moisture resistance. Dominant choice for MV/HV power cables.
Limitations: Less flexible than rubber. Susceptible to water treeing without semi-conductive screens at MV.

Insulation Type 03

EPR

Ethylene Propylene Rubber

Max. Conductor Temp.: 90°C continuous / 250°C short-circuit
Dielectric Constant (εr): 2.8 - 3.5
Tensile Strength: ≥ 5.0 MPa
Key Strengths: Outstanding ozone and UV resistance, excellent performance in wet conditions. Preferred for marine, offshore, and outdoor MV applications.
Limitations: Higher material cost. Slightly higher dielectric losses than XLPE at elevated frequencies.

Insulation Type 04

Rubber

Natural / Synthetic (SBR, EPDM)

Max. Conductor Temp.: 60-85°C continuous / 200°C short-circuit
Elongation at Break: ≥ 200%
Min. Bending Temp.: -40°C (cold-flex grade)
Key Strengths: Unmatched flexibility and impact resistance. Ideal for portable equipment, welding cables, and reeling drum applications.
Limitations: Flammable without additives. Not suitable for fixed MV installations or high-temperature environments.

Insulation Type 05

LSZH

Low Smoke Zero Halogen

Max. Conductor Temp.: 70-90°C continuous / 200°C short-circuit
Smoke Density (Ds): ≤ 60% (IEC 61034)
Halogen Content: ≤ 0.5% HCl (IEC 60754-1)
Key Strengths: Minimal toxic gas and smoke emission during fire. Mandatory for rail transit, tunnels, data centers, and public buildings.
Limitations: Generally harder and less flexible than PVC. Requires careful compound selection to maintain mechanical performance.

Quick Reference

Thermal Ranking

Current-carrying capacity comparison at same conductor cross-section (approximate, underground direct burial, 20°C ambient):

XLPE / EPR (90°C) 100%

LSZH (90°C grade) ~98%

Rubber (85°C) ~92%

PVC (70°C) ~80%

Higher operating temperature allows greater current-carrying capacity for the same conductor size, reducing material cost at system level.

Recommended Insulation by Industry

Industry / Environment	Primary	Alternative
Power Transmission (MV/HV)	XLPE	EPR
General Building Wiring (LV)	PVC	LSZH
Rail Transit / Metro / Rolling Stock	LSZH	XLPE+LSZH sheath
Marine / Offshore / Port	EPR	XLPE
Petrochemical / Oil & Gas	EPR	XLPE, PVC (FR grade)
Mining (Underground)	Rubber	EPR
Robotics / Continuous Flex	Rubber	Special TPE
Solar PV / Renewable Energy	XLPE	EPR (TÜV grade)
Data Centers / Tunnels	LSZH	XLPE+LSZH
Welding / Portable Equipment	Rubber	--

Insulation vs. Environmental Conditions

High
Temp.

Elevated Ambient / High Load Cycles

XLPE and EPR are the only insulations rated for 90°C continuous operation. PVC degrades above 70°C conductor temperature. For industrial furnaces or engine rooms, specify EPR with 90°C rating.

→ Specify: XLPE or EPR

Wet /
Submerged

Direct Burial, Flooded Ducts, Coastal

XLPE has the lowest water absorption rate among thermosetting insulations. EPR performs equally well. Rubber absorbs moisture over time and is not recommended for permanent submersion.

→ Specify: XLPE (with PE outer sheath) or EPR

Fire
Safety

Enclosed Spaces, Public Infrastructure

LSZH is mandatory in rail, tunnel, and public building applications under EN 45545-2 and IEC 60332-3. PVC emits toxic HCl -- prohibited in many enclosed installations in Europe.

→ Specify: LSZH (IEC 60754 / EN 50525-3)

Flex /
Dynamic

Continuous Movement, Reeling Drums, Robotics

Rubber (especially EPDM and neoprene compounds) provides the highest elongation at break (200%+) and cold-flex performance down to -40°C. XLPE is not recommended for continuous flexing.

→ Specify: Rubber (H07RN-F / IEC 60245)

Jinda Manufacturing Capability

All five insulation systems available across Jinda's full product range.

Jinda produces cables with all insulation types listed in this guide -- from standard PVC LV cables to EPR marine cables and LSZH rail transit cables -- all manufactured to IEC, GB, BS, UL, and VDE standards at five production bases.

Voltage Range

0.6/1kV - 35kV

Product Series

27 Series

SKUs Available

3,000+

OEM/ODM

Available

Insulation Selection Decision Framework

What is the operating voltage?

LV: Up to 1kV

PVC, XLPE, LSZH, Rubber -- all suitable. Proceed to Step 2.

MV: 1kV - 35kV

XLPE or EPR required. PVC not suitable above 1kV.

Is fire safety a primary requirement?

Yes -- Enclosed / Public Space

Specify LSZH. Required for rail, tunnels, data centers, hospitals. Refer to EN 45545-2, IEC 60332-3.

No -- Industrial / Outdoor

Standard FR-PVC or XLPE acceptable. Proceed to Step 3.

What is the installation environment?

Marine / Outdoor / UV

EPR preferred. Excellent ozone and UV stability. XLPE acceptable with UV-stabilized sheath.

Chemical / Oil Exposure

EPR for chemical resistance. PVC acceptable for mild oil environments. Rubber -- limited.

Standard Indoor / Duct

XLPE or PVC. XLPE preferred for higher current capacity and longer service life.

Is the cable subject to movement or flexing?

Yes -- Dynamic / Reeling / Robotic

Rubber insulation mandatory. Class 5 or 6 fine-stranded conductor. Specify H07RN-F or equivalent.

No -- Fixed Installation

XLPE or PVC. Class 1 or 2 conductor. Proceed to Step 5.

What is the project budget priority?

Lowest First Cost

PVC (LV only). Widely available, easy to install. Lower current capacity per mm².

Best Lifecycle Value

XLPE. Higher upfront cost offset by 30+ year service life and reduced conductor cross-section.

Compliance-Driven

LSZH or EPR where standards mandate. Non-negotiable for rail, marine, and hazardous areas.

Quick Pick Summary

General LV Wiring

→ PVC (YJV / VV series)

MV Power Distribution

→ XLPE (YJV / YJLV series)

Marine / Offshore

→ EPR (IEC 60092 series)

Rail / Metro / Tunnel

→ LSZH (EN 45545-2 HL3)

Mining / Port / Crane

→ Rubber (H07RN-F / YC)

Solar PV / Wind

→ XLPE (TÜV / EN 50618)

Key Standards Reference

IEC 60502: Power cables with extruded insulation 1kV-30kV
GB/T 12706: Chinese national standard for PVC/XLPE power cables
IEC 60245: Rubber-insulated cables -- rated voltages up to 450/750V
IEC 60092: Electrical installations in ships -- cables
EN 45545-2: Fire protection on railway vehicles -- HL1/2/3
IEC 60332-3: Tests for flame propagation on cables in bundles
IEC 60754-1: Halogen acid gas emission -- LSZH verification

Need Technical Advice?

Our engineers can recommend the correct insulation for your project.

Send us your application details -- voltage, environment, installation method, and applicable standards -- and receive a technical recommendation within 1 business day.

Request Technical Consultation

Need a specific insulation type or custom compound?

Jinda offers OEM/ODM manufacturing across all insulation systems with full traceability from material to delivery.

Request a Quote Download Datasheet

Cable Insulation MaterialComparison Guide

PVC