The difference between LDPE and HDPE

- Jul 04, 2018-

The difference between HDPE and LDPE is:


HDPE, this plastic raw material is generally opaque. After biting with a tooth, there will be white scars appearing at the crack. It is relatively brittle and hard, and it is used for packaging products.


LDPE is soft, has good toughness, good transparency, and is relatively smooth to the touch.

The difference between HDPE and LDPE uses:


HDPE can be used for drawing, injection molding, hollow and blown film grades. Its relative plastic products are: fishing nets, barrels, Wahaha bottles and bags.


LDPE plastics are generally used for film products, and are generally used in industrial films, mulch films, agricultural films, and the like.

The difference between HDPE and LDPE physical performance:

Common points: in terms of odor and toxicity, they are non-toxic, tasteless and odorless. Fortunately, he is both non-toxic and harmless to the body. Plastics can put a hundred hearts.

The difference between HDPE and LDPE mechanical properties:

HDPE has high strength, good toughness, strong rigidity, close to PP, and is tougher than PP. Uses for extrusion packaging film, ropes, woven bags, fishing nets, water pipes; for injection molding low-grade daily necessities and casings, non-load bearing components, plastic boxes, turnover boxes; for extrusion blow molding containers, hollow products, bottles. The mechanical properties of LDPE are relatively poor.

Difference between heat and cold resistance:

It has good heat resistance and cold resistance. It is excellent at normal temperature even at -40F low temperature. It has excellent impact resistance, low temperature embrittlement temperature < -90 °C, low heat resistance, low temperature embrittlement temperature <-70 °C

The difference between HDPE and LDPE softening point:

HDPE: 125-135 ° C,

LDPE: 90-100

Acid, alkali, corrosion, organic solvent performance difference:


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


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