What are the six main types of plastic?

The 6 Main Types of Plastic You Should Know

Every day, we interact with plastic—on grocery shelves, in packaging, and even in our clothes. But not all plastics are the same. Understanding the different types helps make smarter choices for health and the environment.

PET or PETE (Polyethylene Terephthalate) is the most common for single-use bottles and containers. It’s lightweight and recyclable, but best used once—repeated use can leach chemicals.

HDPE (High-Density Polyethylene) is sturdier, found in milk jugs, detergent bottles, and some shopping bags. It’s highly recyclable and resistant to heat and impact, making it a safer option overall.

PVC (Polyvinyl Chloride) appears in pipes, shower curtains, and cables. It’s durable but problematic—often called the "poison plastic" because it can release harmful chemicals during production and disposal.

LDPE (Low-Density Polyethylene) wraps our bread, produce, and frozen foods. While flexible and safe for food contact, it’s less commonly recycled and often ends up in landfills.

Polypropylene (PP) is the go-to for microwave-safe containers and bottle caps. Resistant to heat and chemicals, it’s increasingly accepted in recycling programs, though not universally.

Polystyrene (PS), often known as Styrofoam, is used in disposable cups, packing peanuts, and takeout boxes. It’s lightweight but breaks down slowly—and can release toxins when burned or buried.

While some sources mention a seventh type (other), the six above cover most everyday plastics. Each has a resin code (1 through 7) stamped on the bottom. Knowing them helps avoid harmful materials and supports better recycling habits.