GITNUXREPORT 2026

Polyethylene Statistics

Polyethylene's varying density and strength enable countless essential products worldwide.

Gitnux Team

Expert team of market researchers and data analysts.

First published: Feb 13, 2026

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Statistic 1

HDPE used in 12% of global plastic packaging market valued at $40 billion in 2023

Statistic 2

Bottles and containers account for 35% of HDPE consumption worldwide

Statistic 3

PE pipes represent 20% of PE demand with 4.5 million tons/year growth projected to 2028

Statistic 4

Agricultural films use 7 million tons of LLDPE annually for mulching and greenhouses

Statistic 5

Global PE market size was $142 billion in 2022 with 4.5% CAGR forecast to 2030

Statistic 6

UHMWPE in medical implants like hip joints totals 10,000 tons/year market value $2B

Statistic 7

PE in flexible packaging grew to 25 million tons in 2023 driven by e-commerce

Statistic 8

Rotomolded PE products for toys and tanks use 3 million tons annually

Statistic 9

LDPE grocery bags banned in 100+ countries covering 40% of global PE film use

Statistic 10

Automotive fuel tanks from HDPE number 50 million units/year reducing weight by 20%

Statistic 11

PE wax market for lubricants and coatings is 1.2 million tons valued at $1.5B in 2023

Statistic 12

Ocean plastic pollution from PE mismanaged waste is 1.5 million tons/year

Statistic 13

Recycled PE content in new bottles reached 25% average in EU by 2023 regulation

Statistic 14

Geomembrane liners from HDPE cover 500,000 acres for landfills annually

Statistic 15

PE in 3D printing filaments market grows at 20% CAGR to $500M by 2027

Statistic 16

Carbon footprint of virgin HDPE production is 1.8-2.2 kg CO2 eq/kg

Statistic 17

Microplastics from PE tire wear contribute 28% of ocean microplastics or 1 million tons/year

Statistic 18

Price of HDPE spot market averaged $1200/ton in US Q4 2023

Statistic 19

Bio-PE adoption in cosmetics packaging up 15% to 50,000 tons/year for sustainability

Statistic 20

PE recycling plants worldwide process 9 million tons/year with 30% recovery efficiency

Statistic 21

Volume resistivity of LDPE is >10^16 ohm·cm at 23°C and 50% RH

Statistic 22

Dielectric strength of HDPE film is 60-80 kV/mm in air per ASTM D149

Statistic 23

Dissipation factor of PE at 1 kHz is <0.0005 for communication cables

Statistic 24

Carbon black content in UV-stabilized HDPE is 2-3% by weight for pipes

Statistic 25

Monomer residue in HDPE polymerization is <1 ppm ethylene per FDA 21 CFR 177.1520

Statistic 26

Antioxidant concentration in PE compounds is 0.1-0.5 wt% Irganox 1010 equivalent

Statistic 27

pH stability of PE ranges from 2-12 with no degradation after 1000 hours immersion

Statistic 28

Swell index in hydrocarbons for LDPE is <10% volume change in toluene at 23°C

Statistic 29

Chlorine resistance of PEX pipes shows <10% strength loss after 4000 hours at 40 ppm

Statistic 30

Biodegradation rate of PE in soil is <0.1% weight loss per year without pro-oxidants

Statistic 31

Ash content of virgin PE is <0.1% by thermogravimetric analysis at 800°C

Statistic 32

Melt flow rate sensitivity to shear for metallocene PE is lower with PDI <2.5

Statistic 33

Extractables in hot water for food-grade PE <0.5 mg/dm² per EU 10/2011

Statistic 34

The tensile strength of HDPE at 23°C is 22-29 MPa according to ISO 527 for blow molding grades

Statistic 35

LDPE elongation at break exceeds 600% in uniaxial tension tests at room temperature

Statistic 36

Young's modulus for LLDPE is 200-400 MPa depending on density and comonomer type

Statistic 37

Notched Izod impact strength of HDPE at 23°C is 20-40 J/m for pipe grades

Statistic 38

Flexural strength of MDPE is 15-25 MPa at yield per ASTM D790

Statistic 39

Fatigue strength of UHMWPE under cyclic loading is >10^7 cycles at 5 MPa stress amplitude

Statistic 40

Shear modulus of LDPE at 1 Hz and 23°C is approximately 100-200 MPa

Statistic 41

Compressive yield strength of HDPE foam is 0.5-2.0 MPa at 10% deformation for 30 kg/m³ density

Statistic 42

Burst pressure resistance of HDPE pipes is up to 4 times the working pressure per ISO 4427

Statistic 43

Tensile creep rupture time for PEX-a at 80°C and 3.4 MPa exceeds 50 years

Statistic 44

Dynamic mechanical analysis shows HDPE storage modulus peaks at 1-2 GPa above glass transition

Statistic 45

Fracture toughness K_IC of UHMWPE is 3-5 MPa·m^{1/2} for orthopedic grades

Statistic 46

Wear rate of HDPE in Taber abrasion test is <0.1 mg/1000 cycles under 1000g load

Statistic 47

Bending modulus of LLDPE films is 150-250 MPa at 23°C per ASTM D882

Statistic 48

Impact resistance of cross-linked PE at -20°C is >10 ft-lb/in for rotational molding

Statistic 49

Ultimate tensile strength of recycled HDPE is 18-25 MPa after reprocessing

Statistic 50

Modulus of elasticity in torsion for PE is 0.3-0.5 GPa at room temperature

Statistic 51

Environmental stress crack resistance (ESCR) of HDPE in 10% Igepal exceeds 500 hours per ASTM D1693

Statistic 52

The density of Low-Density Polyethylene (LDPE) typically ranges from 0.910 to 0.925 g/cm³ at 23°C

Statistic 53

High-Density Polyethylene (HDPE) has a density between 0.941 and 0.965 g/cm³, making it suitable for rigid applications

Statistic 54

Linear Low-Density Polyethylene (LLDPE) exhibits a density of 0.915 to 0.925 g/cm³ with improved tensile properties over LDPE

Statistic 55

The melt index of LDPE varies from 0.1 to 50 g/10 min under ASTM D1238 conditions at 190°C/2.16 kg

Statistic 56

HDPE's crystallinity is approximately 60-80%, contributing to its higher strength compared to LDPE's 40-55%

Statistic 57

Ultra-High Molecular Weight Polyethylene (UHMWPE) has a molecular weight exceeding 3.5 million g/mol, resulting in exceptional wear resistance

Statistic 58

Cross-linked Polyethylene (PEX) shows a gel content of over 65% after irradiation crosslinking process

Statistic 59

The refractive index of PE is around 1.51-1.52 for sodium D-line at 20°C

Statistic 60

LDPE has a specific heat capacity of 2.3 J/g·K at 20°C, increasing to 2.6 J/g·K near melting point

Statistic 61

HDPE's water absorption is less than 0.01% after 24 hours immersion at 23°C per ASTM D570

Statistic 62

The coefficient of linear thermal expansion for HDPE is 1.2-1.8 x 10^-4 /°C between 20-60°C

Statistic 63

LDPE film thickness for grocery bags averages 0.025 mm (1 mil), with tensile strength of 10-20 MPa

Statistic 64

UHMWPE's porosity in sintered form is controlled below 1% for medical implants

Statistic 65

The surface tension of molten PE at 200°C is approximately 30-35 mN/m

Statistic 66

HDPE pipes have an inside diameter tolerance of ±1% for sizes up to 24 inches per AWWA C906

Statistic 67

LDPE's hardness on Shore D scale is 45-55, indicating flexibility for squeeze bottles

Statistic 68

The dielectric constant of PE at 1 MHz is 2.25-2.35 for LDPE

Statistic 69

Molecular weight distribution (MWD) polydispersity index for Ziegler-Natta HDPE is 4-8

Statistic 70

PE foam density ranges from 15-100 kg/m³ depending on expansion ratio for packaging

Statistic 71

The gloss level of extruded HDPE film is 40-60% at 45° angle per ASTM D2457

Statistic 72

Tensile modulus of elasticity for LDPE is 150-300 MPa at 23°C

Statistic 73

HDPE's yield strength is 20-30 MPa for injection molded grades per ISO 527

Statistic 74

Elongation at break for LLDPE films reaches 500-800% in machine direction

Statistic 75

Impact strength of HDPE at -40°C is >5 kJ/m² notched Izod per ASTM D256

Statistic 76

Flexural modulus for medium-density PE (MDPE) is 400-800 MPa at 23°C

Statistic 77

Tear strength of LDPE blown film is 200-400 g/μm in dart drop test ASTM D1709

Statistic 78

Compressive strength of UHMWPE is 20-30 MPa at 10% strain

Statistic 79

Poisson's ratio for HDPE is approximately 0.42-0.46 under tensile loading

Statistic 80

Creep modulus of LDPE after 1000 hours at 23°C and 4 MPa is 100-200 MPa

Statistic 81

Hardness of crosslinked PE (PEX) is Shore D 55-65 post-crosslinking

Statistic 82

Global production capacity of polyethylene reached 109 million metric tons per year in 2022

Statistic 83

HDPE accounts for 53% of total PE production worldwide as of 2023

Statistic 84

Annual ethylene consumption for PE is over 100 million tonnes, representing 60% of total ethylene use

Statistic 85

Ziegler-Natta catalysis produces 70% of HDPE via slurry or gas phase processes

Statistic 86

Metallocene catalysts yield LLDPE with narrow MWD, comprising 15% of PE market since 2000

Statistic 87

China holds 35% of global PE production capacity at 38 million tons/year in 2023

Statistic 88

Energy intensity for HDPE production is 70-80 GJ/tonne including cracking

Statistic 89

Slurry loop reactor for HDPE operates at 80-110°C and 20-60 bar pressure

Statistic 90

Bimodal PE production via cascade reactors achieves 20-30% higher throughput

Statistic 91

Autoclave process for LDPE uses 150-300 MPa pressure and 150-300°C temperature

Statistic 92

Catalyst consumption in PE plants is 1-5 ppm Ti for Phillips loop process

Statistic 93

Recycling rate of post-consumer PE in Europe reached 28% in 2022

Statistic 94

Gas phase Unipol process produces 40% of world's LLDPE at >50,000 tons/year per reactor

Statistic 95

Ethylene conversion yield in HDPE slurry process exceeds 99% with flash devolatilization

Statistic 96

Number of PE plants worldwide is over 300 with average capacity 400,000 tons/year

Statistic 97

Tubular reactor LDPE plants have residence time of 30-120 seconds for high-pressure polymerization

Statistic 98

Bio-based PE production from sugarcane reached 200,000 tons/year by Braskem in 2023

Statistic 99

HDPE resin yield per kg catalyst is 100,000-500,000 in modern metallocene systems

Statistic 100

Global LDPE production was 18.5 million tons in 2022, down 2% from prior year

Statistic 101

PE film extrusion lines produce 500-2000 kg/hour with die gap 0.5-2 mm

Statistic 102

Melting temperature of LDPE is 105-115°C with peak at 112°C by DSC at 10°C/min

Statistic 103

HDPE crystallizes at 110-120°C cooling rate dependent, with heat of fusion 150-200 J/g

Statistic 104

Glass transition temperature Tg of PE is -120 to -80°C for amorphous regions by DSC

Statistic 105

Thermal conductivity of HDPE is 0.42-0.51 W/m·K at 23°C

Statistic 106

Vicat softening point for LDPE is 85-95°C under 10N load per ISO 306

Statistic 107

Heat deflection temperature (HDT) of HDPE at 0.45 MPa is 50-60°C per ASTM D648

Statistic 108

Oxidative induction time (OIT) for stabilized HDPE exceeds 20 minutes at 200°C by DSC

Statistic 109

Coefficient of thermal expansion for LDPE is 1.8-2.5 x 10^{-4} /°C from 0-100°C

Statistic 110

Specific heat of molten PE at 200°C is 2.5-2.8 J/g·K

Statistic 111

Flammability rating of PE is HB per UL 94 with oxygen index 17-19%

Statistic 112

Thermal diffusivity of HDPE is 1.5-2.0 x 10^{-7} m²/s at room temperature

Statistic 113

Deflection temperature under load for PEX-b is 90-95°C at 0.5 MPa

Statistic 114

Heat capacity ratio Cp/Cv for PE gas phase is approximately 1.1 at 298K

Statistic 115

Ignition temperature of PE in air is 340-360°C under ASTM E659

Statistic 116

Shrinkage of injection molded HDPE is 1.5-3.0% in flow direction

1/116

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From plastic bags to medical implants, polyethylene's remarkable versatility emerges from its diverse chemical properties, with densities spanning from feather-light 0.910 g/cm³ for flexible films to a sturdy 0.965 g/cm³ for rigid pipes, a range that defines its presence in nearly every aspect of modern life.

Key Takeaways

The density of Low-Density Polyethylene (LDPE) typically ranges from 0.910 to 0.925 g/cm³ at 23°C
High-Density Polyethylene (HDPE) has a density between 0.941 and 0.965 g/cm³, making it suitable for rigid applications
Linear Low-Density Polyethylene (LLDPE) exhibits a density of 0.915 to 0.925 g/cm³ with improved tensile properties over LDPE
The tensile strength of HDPE at 23°C is 22-29 MPa according to ISO 527 for blow molding grades
LDPE elongation at break exceeds 600% in uniaxial tension tests at room temperature
Young's modulus for LLDPE is 200-400 MPa depending on density and comonomer type
Melting temperature of LDPE is 105-115°C with peak at 112°C by DSC at 10°C/min
HDPE crystallizes at 110-120°C cooling rate dependent, with heat of fusion 150-200 J/g
Glass transition temperature Tg of PE is -120 to -80°C for amorphous regions by DSC
Volume resistivity of LDPE is >10^16 ohm·cm at 23°C and 50% RH
Dielectric strength of HDPE film is 60-80 kV/mm in air per ASTM D149
Dissipation factor of PE at 1 kHz is <0.0005 for communication cables
Global production capacity of polyethylene reached 109 million metric tons per year in 2022
HDPE accounts for 53% of total PE production worldwide as of 2023
Annual ethylene consumption for PE is over 100 million tonnes, representing 60% of total ethylene use

Polyethylene's varying density and strength enable countless essential products worldwide.

Applications, Market, and Environmental Impact

HDPE used in 12% of global plastic packaging market valued at $40 billion in 2023
Bottles and containers account for 35% of HDPE consumption worldwide
PE pipes represent 20% of PE demand with 4.5 million tons/year growth projected to 2028
Agricultural films use 7 million tons of LLDPE annually for mulching and greenhouses
Global PE market size was $142 billion in 2022 with 4.5% CAGR forecast to 2030
UHMWPE in medical implants like hip joints totals 10,000 tons/year market value $2B
PE in flexible packaging grew to 25 million tons in 2023 driven by e-commerce
Rotomolded PE products for toys and tanks use 3 million tons annually
LDPE grocery bags banned in 100+ countries covering 40% of global PE film use
Automotive fuel tanks from HDPE number 50 million units/year reducing weight by 20%
PE wax market for lubricants and coatings is 1.2 million tons valued at $1.5B in 2023
Ocean plastic pollution from PE mismanaged waste is 1.5 million tons/year
Recycled PE content in new bottles reached 25% average in EU by 2023 regulation
Geomembrane liners from HDPE cover 500,000 acres for landfills annually
PE in 3D printing filaments market grows at 20% CAGR to $500M by 2027
Carbon footprint of virgin HDPE production is 1.8-2.2 kg CO2 eq/kg
Microplastics from PE tire wear contribute 28% of ocean microplastics or 1 million tons/year
Price of HDPE spot market averaged $1200/ton in US Q4 2023
Bio-PE adoption in cosmetics packaging up 15% to 50,000 tons/year for sustainability
PE recycling plants worldwide process 9 million tons/year with 30% recovery efficiency

Applications, Market, and Environmental Impact Interpretation

Polyethylene might be the world's most versatile frenemy, seamlessly packaging our lives, fortifying our infrastructure, and even replacing our hips, all while we grapple with its omnipresent and polluting shadow in a race to recycle, regulate, and innovate our way toward a less burdensome coexistence.

Chemical Properties

Volume resistivity of LDPE is >10^16 ohm·cm at 23°C and 50% RH
Dielectric strength of HDPE film is 60-80 kV/mm in air per ASTM D149
Dissipation factor of PE at 1 kHz is <0.0005 for communication cables
Carbon black content in UV-stabilized HDPE is 2-3% by weight for pipes
Monomer residue in HDPE polymerization is <1 ppm ethylene per FDA 21 CFR 177.1520
Antioxidant concentration in PE compounds is 0.1-0.5 wt% Irganox 1010 equivalent
pH stability of PE ranges from 2-12 with no degradation after 1000 hours immersion
Swell index in hydrocarbons for LDPE is <10% volume change in toluene at 23°C
Chlorine resistance of PEX pipes shows <10% strength loss after 4000 hours at 40 ppm
Biodegradation rate of PE in soil is <0.1% weight loss per year without pro-oxidants
Ash content of virgin PE is <0.1% by thermogravimetric analysis at 800°C
Melt flow rate sensitivity to shear for metallocene PE is lower with PDI <2.5
Extractables in hot water for food-grade PE <0.5 mg/dm² per EU 10/2011

Chemical Properties Interpretation

This collection of statistics reveals polyethylene as a material that is incredibly inert, electrically stubborn, chemically unflappable, and meticulously engineered to endure our world while leaving almost no trace of itself behind.

Mechanical Properties

The tensile strength of HDPE at 23°C is 22-29 MPa according to ISO 527 for blow molding grades
LDPE elongation at break exceeds 600% in uniaxial tension tests at room temperature
Young's modulus for LLDPE is 200-400 MPa depending on density and comonomer type
Notched Izod impact strength of HDPE at 23°C is 20-40 J/m for pipe grades
Flexural strength of MDPE is 15-25 MPa at yield per ASTM D790
Fatigue strength of UHMWPE under cyclic loading is >10^7 cycles at 5 MPa stress amplitude
Shear modulus of LDPE at 1 Hz and 23°C is approximately 100-200 MPa
Compressive yield strength of HDPE foam is 0.5-2.0 MPa at 10% deformation for 30 kg/m³ density
Burst pressure resistance of HDPE pipes is up to 4 times the working pressure per ISO 4427
Tensile creep rupture time for PEX-a at 80°C and 3.4 MPa exceeds 50 years
Dynamic mechanical analysis shows HDPE storage modulus peaks at 1-2 GPa above glass transition
Fracture toughness K_IC of UHMWPE is 3-5 MPa·m^{1/2} for orthopedic grades
Wear rate of HDPE in Taber abrasion test is <0.1 mg/1000 cycles under 1000g load
Bending modulus of LLDPE films is 150-250 MPa at 23°C per ASTM D882
Impact resistance of cross-linked PE at -20°C is >10 ft-lb/in for rotational molding
Ultimate tensile strength of recycled HDPE is 18-25 MPa after reprocessing
Modulus of elasticity in torsion for PE is 0.3-0.5 GPa at room temperature
Environmental stress crack resistance (ESCR) of HDPE in 10% Igepal exceeds 500 hours per ASTM D1693

Mechanical Properties Interpretation

Given this laundry list of impressive yet highly specific feats, one might say polyethylene is essentially that relentlessly versatile friend who modestly excels at everything from casual bending to heroic load-bearing, all while politely waiting centuries to fail under pressure.

Physical Properties

The density of Low-Density Polyethylene (LDPE) typically ranges from 0.910 to 0.925 g/cm³ at 23°C
High-Density Polyethylene (HDPE) has a density between 0.941 and 0.965 g/cm³, making it suitable for rigid applications
Linear Low-Density Polyethylene (LLDPE) exhibits a density of 0.915 to 0.925 g/cm³ with improved tensile properties over LDPE
The melt index of LDPE varies from 0.1 to 50 g/10 min under ASTM D1238 conditions at 190°C/2.16 kg
HDPE's crystallinity is approximately 60-80%, contributing to its higher strength compared to LDPE's 40-55%
Ultra-High Molecular Weight Polyethylene (UHMWPE) has a molecular weight exceeding 3.5 million g/mol, resulting in exceptional wear resistance
Cross-linked Polyethylene (PEX) shows a gel content of over 65% after irradiation crosslinking process
The refractive index of PE is around 1.51-1.52 for sodium D-line at 20°C
LDPE has a specific heat capacity of 2.3 J/g·K at 20°C, increasing to 2.6 J/g·K near melting point
HDPE's water absorption is less than 0.01% after 24 hours immersion at 23°C per ASTM D570
The coefficient of linear thermal expansion for HDPE is 1.2-1.8 x 10^-4 /°C between 20-60°C
LDPE film thickness for grocery bags averages 0.025 mm (1 mil), with tensile strength of 10-20 MPa
UHMWPE's porosity in sintered form is controlled below 1% for medical implants
The surface tension of molten PE at 200°C is approximately 30-35 mN/m
HDPE pipes have an inside diameter tolerance of ±1% for sizes up to 24 inches per AWWA C906
LDPE's hardness on Shore D scale is 45-55, indicating flexibility for squeeze bottles
The dielectric constant of PE at 1 MHz is 2.25-2.35 for LDPE
Molecular weight distribution (MWD) polydispersity index for Ziegler-Natta HDPE is 4-8
PE foam density ranges from 15-100 kg/m³ depending on expansion ratio for packaging
The gloss level of extruded HDPE film is 40-60% at 45° angle per ASTM D2457
Tensile modulus of elasticity for LDPE is 150-300 MPa at 23°C
HDPE's yield strength is 20-30 MPa for injection molded grades per ISO 527
Elongation at break for LLDPE films reaches 500-800% in machine direction
Impact strength of HDPE at -40°C is >5 kJ/m² notched Izod per ASTM D256
Flexural modulus for medium-density PE (MDPE) is 400-800 MPa at 23°C
Tear strength of LDPE blown film is 200-400 g/μm in dart drop test ASTM D1709
Compressive strength of UHMWPE is 20-30 MPa at 10% strain
Poisson's ratio for HDPE is approximately 0.42-0.46 under tensile loading
Creep modulus of LDPE after 1000 hours at 23°C and 4 MPa is 100-200 MPa
Hardness of crosslinked PE (PEX) is Shore D 55-65 post-crosslinking

Physical Properties Interpretation

It appears we have a delightful spectrum of sibling rivalry where the polyethylene family demonstrates that, much like people, you can be soft and flexible, tough and rigid, or remarkably resistant to everything, all determined by a few key measurements of your internal structure.

Production and Manufacturing

Global production capacity of polyethylene reached 109 million metric tons per year in 2022
HDPE accounts for 53% of total PE production worldwide as of 2023
Annual ethylene consumption for PE is over 100 million tonnes, representing 60% of total ethylene use
Ziegler-Natta catalysis produces 70% of HDPE via slurry or gas phase processes
Metallocene catalysts yield LLDPE with narrow MWD, comprising 15% of PE market since 2000
China holds 35% of global PE production capacity at 38 million tons/year in 2023
Energy intensity for HDPE production is 70-80 GJ/tonne including cracking
Slurry loop reactor for HDPE operates at 80-110°C and 20-60 bar pressure
Bimodal PE production via cascade reactors achieves 20-30% higher throughput
Autoclave process for LDPE uses 150-300 MPa pressure and 150-300°C temperature
Catalyst consumption in PE plants is 1-5 ppm Ti for Phillips loop process
Recycling rate of post-consumer PE in Europe reached 28% in 2022
Gas phase Unipol process produces 40% of world's LLDPE at >50,000 tons/year per reactor
Ethylene conversion yield in HDPE slurry process exceeds 99% with flash devolatilization
Number of PE plants worldwide is over 300 with average capacity 400,000 tons/year
Tubular reactor LDPE plants have residence time of 30-120 seconds for high-pressure polymerization
Bio-based PE production from sugarcane reached 200,000 tons/year by Braskem in 2023
HDPE resin yield per kg catalyst is 100,000-500,000 in modern metallocene systems
Global LDPE production was 18.5 million tons in 2022, down 2% from prior year
PE film extrusion lines produce 500-2000 kg/hour with die gap 0.5-2 mm

Production and Manufacturing Interpretation

Polyethylene is the globe's true plastic heartbeat, from its staggering production dominance in China to the niche innovations pushing the boundaries of recycling and bio-based alternatives, all while billions of tons of polymer quietly form in reactors under extreme pressure and with astonishing efficiency.

Thermal Properties

Melting temperature of LDPE is 105-115°C with peak at 112°C by DSC at 10°C/min
HDPE crystallizes at 110-120°C cooling rate dependent, with heat of fusion 150-200 J/g
Glass transition temperature Tg of PE is -120 to -80°C for amorphous regions by DSC
Thermal conductivity of HDPE is 0.42-0.51 W/m·K at 23°C
Vicat softening point for LDPE is 85-95°C under 10N load per ISO 306
Heat deflection temperature (HDT) of HDPE at 0.45 MPa is 50-60°C per ASTM D648
Oxidative induction time (OIT) for stabilized HDPE exceeds 20 minutes at 200°C by DSC
Coefficient of thermal expansion for LDPE is 1.8-2.5 x 10^{-4} /°C from 0-100°C
Specific heat of molten PE at 200°C is 2.5-2.8 J/g·K
Flammability rating of PE is HB per UL 94 with oxygen index 17-19%
Thermal diffusivity of HDPE is 1.5-2.0 x 10^{-7} m²/s at room temperature
Deflection temperature under load for PEX-b is 90-95°C at 0.5 MPa
Heat capacity ratio Cp/Cv for PE gas phase is approximately 1.1 at 298K
Ignition temperature of PE in air is 340-360°C under ASTM E659
Shrinkage of injection molded HDPE is 1.5-3.0% in flow direction

Thermal Properties Interpretation

Polyethylene is a stubbornly stoic polymer that barely softens for a hot cup of coffee, refuses to melt until well past boiling water, and is basically a frozen puddle at room temperature, yet it will still catch fire if you look at it too intently with a blowtorch.

Sources & References

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