PETG (Polyethylene Terephthalate Glycol) film is a type of thermoplastic polymer film that is commonly used in hot air and steam tunnels for shrink wrapping and packaging applications.

The features of PETG film for hot air and steam tunnels include:

1. High Heat Resistance: PETG film has a high heat resistance, which allows it to withstand the high temperatures of hot air and steam tunnels without melting or deforming.

2. Good Clarity: PETG film has good clarity, which makes it ideal for packaging applications where the contents of the package need to be visible.
   

3. High Impact Resistance: It is also known for its high impact resistance, which makes it a good choice for protecting products during transport and storage.

4. Good Chemical Resistance: PETG film has good chemical resistance, making it resistant to a wide range of chemicals, including acids and bases.

5. Good Moisture Barrier: It provides a good moisture barrier, which helps to protect products from humidity and moisture damage.

6. Good Shrinkage Properties: It has good shrinkage properties, which allows it to conform closely to the shape of the product being packaged, creating a tight and secure fit.

7. High Tensile Strength: It has high tensile strength, which makes it resistant to tearing and ripping.

8. Lightweight and easy to handle: It is lightweight and easy to handle, making it easy to use in packaging operations.

9. Eco-friendly: PETG is recyclable and biodegradable, making it an environmentally friendly alternative to other packaging materials.