2026-2-25 How do you explain why one structure is better than another for a specific application?

How do you explain why one structure is better than another for a specific application?
Please pick one application for example, and explain.

One of my customers needed packaging for hookah. Because the product is acidic or alkaline, the inner LDPE needed to acid and alkali resistant. After further communication, we learned that acid and alkali resistant PE could be used. Although the bag didn't break during use, the altered properties of the LDPE made it very stiff. Another option is to use CPE, but we haven't tested it yet.

We understand many of our customers prefer PET/LDPE packaging to save cost. It is cheap and simple, but for 5kg rice bags, it is not strong enough. These bags can easily break during shipping, and they do not protect rice well from moisture and air, so the rice may not stay fresh very long.

This is why we recommend PA/LDPE for you. This structure is much tougher and more durable, so bags will not break easily. It also keeps rice fresher for a longer time. Although it costs a little more, it can help you avoid problems like broken bags and customer complaints. For heavy rice bags, PA/LDPE is simply safer and more practical.

Al foil has excellent performance, so is Al foil omnipotent?

For example, a packaging that needs to be folded repeatedly (like a standup pouch) uses Al foil, and after fold, it is easy to have pinholes, resulting in a decrease in barrier performance.

In this case, if add a layer foil of NY ,
The structure becomes: PET/AL/NY/PE
Because NY is extremely tough and resistant to puncture.

Or use VMPET instead of Al  foil.
The Al layer is coated on PET. Its folding resistance is better than that of Al foil and the cost is lower. However, its barrier performance is slightly worse than that of Al foil.