HomePET Knowledge BaseWhat Do The Numbers Mean On Plastic Bottles?

What Do The Numbers Mean On Plastic Bottles?

In the realm of recyclables, the imprinted numbers on plastic bottles often spark curiosity and inquiries.


In the realm of recyclables, the imprinted numbers on plastic bottles often spark curiosity and inquiries. "What do the numbers mean on plastic bottles?" If you've ever pondered this question while holding a bottle, you're not alone. Embark on a journey with us as we demystify the significance of those tiny numbers, delving into their importance, the recycling codes, and their implications for our environment. As champions of sustainable packaging, we, at Wkai, a leading manufacturer of Bottle-grade PET chips and Non-bottle-grade PET chips, are here to illuminate the meaning and impact of these numbers.


Understanding Recycling Codes:

The numbers on plastic bottles are not random; they are part of a system known as the Resin Identification Code (RIC) or recycling codes. Introduced to aid in identifying the type of plastic used in the bottle, these codes streamline the recycling process. The RIC features a triangular arrow-shaped symbol with a number inside, with each number corresponding to a specific type of plastic.


Deciphering the Numbers:

1. PET (Polyethylene Terephthalate) - #1:


The number 1 signifies PET plastic, widely employed for water bottles, soda bottles, and food containers. PET is lightweight, transparent, and easily recyclable. Wkai's Bottle-grade PET chips are intricately crafted to ensure top-quality PET plastic for various packaging applications.


2. HDPE (High-Density Polyethylene) - #2:

Bottles bearing the number 2 are made from HDPE, a robust and versatile plastic found in milk jugs, detergent bottles, and some plastic bags. HDPE is celebrated for its recyclability and durability, making it a sustainable choice for packaging.


3. PVC (Polyvinyl Chloride) - #3:

Plastic bottles with the number 3 are composed of PVC, commonly used in squeeze bottles, medical equipment, and pipes. Due to recycling challenges, PVC is less prevalent in packaging, and Wkai promotes environmentally friendly alternatives to PVC.


4. LDPE (Low-Density Polyethylene) - #4:

LDPE is denoted by the number 4 and is often present in flexible packaging like plastic wraps, grocery bags, and squeeze bottles. While LDPE is recyclable, its acceptance in all recycling programs may vary.


5. PP (Polypropylene) - #5:

Number 5 indicates PP plastic, found in yogurt containers, ketchup bottles, and some caps. PP is renowned for its heat resistance and versatility. Wkai ensures the responsible production of PET chips, emphasizing sustainability and eco-friendly practices.


6. PS (Polystyrene) - #6:

PS, or polystyrene, is represented by the number 6 and is present in disposable coffee cups, foam packaging, and certain food containers. PS is less commonly recycled, and Wkai advocates alternatives to reduce environmental impact.


7. Other - #7:

The number 7 serves as a catch-all category for other plastics that don't fit into the previous six. This may include polycarbonate (PC) used in some water bottles. Wkai advocates transparency in packaging materials and offers sustainable options for various applications.


Environmental Impact and Responsibility:

Understanding the numbers on plastic bottles is pivotal for making environmentally responsible choices. Opting for bottles with higher recyclability, such as #1 (PET) and #2 (HDPE), contributes to a more sustainable and circular economy. Wkai, as a manufacturer of PET chips, prioritizes eco-friendly practices and encourages responsible use and disposal of plastic packaging.



The numbers on plastic bottles, often underestimated, carry substantial meaning in the realm of recycling and sustainability. Understanding what these numbers signify empowers consumers to make informed choices that positively impact the environment. Wkai, with its commitment to responsible manufacturing and sustainable practices, stands as a guiding force for eco-friendly solutions in the realm of plastic packaging. Let's persist in decoding the numbers on plastic bottles and strive towards a more sustainable and greener future.


At Wkai, we acknowledge the significance of sustainable packaging in today's world. Our Bottle-grade PET chips are engineered with a focus on recyclability, ensuring PET plastic can be efficiently reused. We prioritize eco-friendly practices in our manufacturing processes and endorse initiatives promoting responsible plastic use. As a company, we aspire to lead in innovation, providing solutions that harmonize functionality with environmental responsibility.

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