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PE

Polyethylene

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Overview

Applications

Comparison

Chemical formula

Specific gravity

0.88-0.97

Thermal properties

-100

Tg(℃)

140

Tm(℃)

Characteristics

Chemical resistance

Flammable

Hydrolysis resistance

Moldability

No dimensional stability

Low temperature resistance

Good weather resistance

Low dielectric loss

Commentary

The simplest macromolecule, a polymer of ethylene.
It is classified as follows based on the polymer structure.

- HDPE (high density PE): Linear, with few short side chains, resulting in high density

- LDPE (low density PE): Many long side chains, resulting in bulkiness and low density

- LLDPE (linear low density PE): Linear, with many short side chains (density is between HDPE and LDPE)

- HMWPE (ultra-high molecular weight PE): Molecular weight increased to 1 million or more

Key points

Low specific gravity (1 or less)

Good characteristics at low-temperature, often used in film for food packaging.

Poor dimensional stability, so unsuitable for precision applications

使われ方

Polyethylene tanks

Reason for adoption

Good at kerosene resistance, High impact resistance even in cold environments.

Polyethylene bags

Reason for adoption

Good properties with thinner film (Good at infration molding prosess,impact strength etc.,)

Electrical wire coating

Reason for adoption

Good at electrical performance (electrical insulation, low dielectric constant), lightweight (low specific gravity)

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