Common Recycling Symbols in Plastic Products: A Complete Guide to Resin Identification Codes

Plastic products are widely used in packaging, food containers, household goods, and industrial applications. To help consumers and manufacturers identify different types of plastics, standardized recycling symbols, also known as Resin Identification Codes (RIC), are printed on most plastic products.

Understanding these plastic recycling symbols is essential for proper waste sorting, sustainable manufacturing, and environmental protection.

What Are Resin Identification Codes (RIC)?

Resin Identification Codes are numbers (1–7) placed inside the universal recycling triangle symbol. They indicate the type of plastic resin used in a product.

These codes were developed in 1988 by the Society of the Plastics Industry (now part of the Plastics Industry Association) to standardize plastic identification for recycling systems.

The number inside the triangle does not always mean the product is recyclable — it simply identifies the material type.

The 7 Common Plastic Recycling Symbols Explained

1️⃣ PET or PETE (Polyethylene Terephthalate)

Common Uses:

• Water bottles

• Soft drink bottles

• Food packaging trays

Features:

• Lightweight and transparent

• Good strength and gas barrier properties

• Widely recyclable

PET is one of the most commonly recycled plastics worldwide.

2️⃣ HDPE (High-Density Polyethylene)

Common Uses:

• Milk jugs

• Detergent bottles

• Shampoo containers

Features:

• Strong and durable

• Resistant to chemicals

• Highly recyclable

HDPE is considered one of the safest plastics for food and household use.

3️⃣ PVC (Polyvinyl Chloride)

Common Uses:

• Pipes

• Cable insulation

• Some food packaging

Features:

• Strong and weather-resistant

• Difficult to recycle

• May contain harmful additives

PVC recycling requires specialized processing.

4️⃣ LDPE (Low-Density Polyethylene)

Common Uses:

• Plastic bags

• Shrink wraps

• Squeeze bottles

Features:

• Flexible and lightweight

• Moisture resistant

• Limited recycling availability

LDPE is recyclable in some specialized facilities.

5️⃣ PP (Polypropylene)

Common Uses:

• Food containers

• Bottle caps

• Microwave-safe containers

Features:

• Heat resistant

• Durable

• Increasingly recyclable

PP is commonly used in food packaging due to its safety and strength.

6️⃣ PS (Polystyrene)

Common Uses:

• Disposable cups

• Foam packaging

• Takeaway food boxes

Features:

• Lightweight

• Insulating properties

• Difficult to recycle

Expanded polystyrene (foam) presents environmental challenges.

7️⃣ Other (Mixed Plastics)

Common Uses:

• Baby bottles

• Medical equipment

• Multi-layer packaging

Features:

• Includes polycarbonate, bioplastics, and mixed materials

• Complex recycling process

This category covers plastics that do not fall into categories 1–6.

Why Recycling Symbols Matter

1. Improve Waste Sorting Efficiency

Correct identification of plastic types helps recycling facilities process materials more effectively.

2. Support Sustainable Manufacturing

Manufacturers can design packaging based on recyclability and environmental regulations.

3. Reduce Environmental Impact

Proper sorting reduces landfill waste and promotes circular economy practices.

4. Help Consumers Make Eco-Friendly Choices

Understanding recycling symbols allows consumers to select more sustainable packaging options.

Are All Plastics with Recycling Symbols Recyclable?

This is a common misconception.

The recycling symbol identifies material type — it does not guarantee that local recycling facilities accept that plastic. Recycling availability depends on:

• Local infrastructure

• Government regulations

• Market demand for recycled resin

Always check local recycling guidelines before disposal.

The Future of Plastic Recycling

With increasing environmental awareness, many countries are:

• Promoting recycled PET (rPET) usage

• Encouraging mono-material packaging

• Implementing extended producer responsibility (EPR) policies

• Investing in advanced recycling technologies

Improved plastic identification and recycling systems play a crucial role in sustainable packaging development.