Performance comparison of HDPE, LDPE and LLDPE materials

Odor, toxicity

Non-toxic, tasteless, odorless

Non-toxic, tasteless, odorless

Non-toxic, tasteless, odorless

density

0.940～0.976g/cm3

0.910～0.940g/cm3

0.915～0.935g/cm3

Crystallinity

85-65%

45-65%

55-65%

Molecular Structure

Contains only carbon-carbon and carbon-hydrogen bonds, requiring more energy to break

The polymer has a small molecular weight and can be broken with less energy.

Linear structure, branch, short chain, less energy, can break

Softening Point

125-135 ° C

90-100 ° C

94-108 ° C

Mechanical behavior

High strength, good toughness and rigidity

Poor mechanical strength

High strength, good toughness and rigidity

Tensile Strength

high

low

Higher

Elongation at break

Higher

low

high

Impact strength

Higher

low

high

Moisture proof, waterproof performance

Good permeability to water, steam, air, low water absorption, good penetration resistance

Wetness and gas barrier

Good permeability to water, steam, air, low water absorption, good penetration resistance

Acid, alkali, corrosion, organic solvent properties

Resistant to strong oxidant corrosion; acid, alkali and various salt corrosion; insoluble in any organic solvent.

Corrosion resistant to acid, alkali and salt solutions, but poor solvent resistance

Acid, alkali, organic solvent

Heat/cold

Good heat and cold resistance, at room temperature even at -40F low temperature, excellent impact resistance, low temperature embrittlement temperature < -90 °C

Low heat resistance, low temperature embrittlement temperature <-70 °C

Good heat and cold resistance, low temperature embrittlement temperature < -90 °C

Resistance to environmental stress cracking

it is good

better

it is good