The number 1 on a water bottle refers to the plastic resin code or recycling symbol. This symbol is a triangular symbol with a number inside it, ranging from 1 to 7, and it indicates the type of plastic used in the bottle. In this case, the number 1 represents PET (Polyethylene terephthalate) [1].

PET is one of the most commonly used plastic materials in the manufacturing of packaging, including water bottles, soda bottles, and other beverage containers. It is lightweight, transparent, and has good barrier properties, making it suitable for storing liquids. However, it is important to note that PET bottles are typically designed for single-use and are not intended for repeated use [1].

Here are some key points about PET (number 1) plastic bottles:

1. Recycling: PET is a recyclable plastic. After being collected, PET bottles are crushed, shredded, and then reused to make new bottles or other plastic products [1].
2. Safety: PET is considered safe for storing beverages and food. However, it is important to follow the manufacturer’s guidelines and not reuse PET bottles beyond their intended single-use purpose. Repeated use of PET bottles can lead to bacterial growth and may cause the release of harmful substances [1].
3. Environmental Impact: Recycling PET bottles helps reduce waste and conserve resources. It is estimated that currently 25% of PET bottles are recycled in the United States [3].

Learn more:

1. Polyethylene terephthalate
2. What is the meaning of the number on the bottom of the plastic bottle? – Plastic Injection Molding Machines Manufacturer in China
3. What are the numbers on water bottles?