Yes, polyethylene is a plastic. It is the most widely used thermoplastic in the world, found in bags, bottles, films and pipes. In industry, it arrives as resin pellets and becomes a product in the extruder, the blow molder or the injection molding machine.
Resin, pellets and plastic: what is the difference
Resin is the polymer as it leaves the petrochemical plant, in pellets. Plastic is the general name for the material and the finished part. When a factory buys polyethylene, it buys resin: pellets with a technical data sheet, ready for the process.
Types of polyethylene
- LDPE (low density): flexible, transparent films.
- LLDPE (linear low density): stronger films, such as stretch film and heavy-duty sacks.
- HDPE (high density): rigid parts, bottles, pipes.
Read the full guide: what is polyethylene.
How pellets become a product
- Blown film: the molten resin forms a bubble that is cooled and wound onto a roll.
- Blow molding: a tube of resin is inflated inside a mold and becomes a bottle.
- Injection molding: the molten resin is injected into a mold and becomes a part.
- Extrusion: the resin passes through a die and becomes pipe, sheet or profile.
Thermoplastic: why it matters
Because it is a thermoplastic, polyethylene can be melted and molded again. That is what allows scrap to be reused inside the factory and the material to be recycled after use.