How Liner & Bottle Compatibility Affects Induction Seal Integrity (With Video Demo)

In this video we highlight a critical factor in achieving a successful induction seal: liner compatibility.

When we talk about liner compatibility, we’re referring to the relationship between the seal layer of the liner and the material of your container. Typically, the seal layer should match the container material—like an LDPE liner sealing to an LDPE bottle. But there’s more to it than that.

Product compatibility plays a vital role too. In some applications, liners must include barrier layers to prevent interactions between the product and the liner material. Your cap supplier should be a trusted resource to help you identify the right liner based on both your bottle type and the nature of your product.

Unfortunately, liner compatibility issues are something we encounter far too often in the field. The telltale sign? Complete seal failure. You might notice that, regardless of how much heat is applied, the liner pops off easily, flakes, or fails to adhere altogether. These are strong indicators that the liner is incompatible with the container.

The Demonstration: Same Bottles with Different Liners

In this video we demonstrate with two LDPE bottles—one with a liner that is not compatible, and the other with a universal liner. We attempt to seal both bottles using the same parameters: 100% power through our deep tunnel sealing head.

After sealing and allowing the appropriate cooling time, we inspect the results. At first glance, both seals appear identical. This is where liner compatibility can be deceptive—visual inspection alone isn’t enough. With just a slight touch, the liner that is not compatible, pops right off the bottle. The bottle with the compatible liner is firmly sealed, showing a successful bond that will protect the product throughout its shelf life.

Need Help? We’re Here for You

Watch the full video to see the demo and if you have questions or need assistance please contact us.

We can provide advice or run a trial in our lab to help you identify the right liner material for your container.