# 6.9.1.5 Liquid polyurethane (PU)

> From: LOCTITE®X Digital Manual for Bonding (https://www.loctitex.com/en/manuals/bonding/6.9.1.5-liquid-polyurethane-pu/)

##### 6.9.1.5 Liquid polyurethane (PU)

Also known as flexible packaging, liquid PU is commonly used for food packaging. Films from different materials are bonded to create a package that preserves food; film selections are important because they need to provide the required attributes for the food product.

_Figure 202 Common films bonded with liquid polyurethanes_

![Figure 202 Common films bonded with liquid polyurethanes](/en/manuals/bonding/assets/img/adhesive-liquid-polyurethane-lamination.jpg)

_Figure 203 Laminating machine_

![Figure 203 Laminating machine](/en/manuals/bonding/assets/img/laminating-machine.jpg)

_Figure 204 Flexible packaging examples_

![Figure 204 Flexible packaging examples](/en/manuals/bonding/assets/img/ahdesive-application-flexible-package.jpg)