When to Use Adhesive vs Non-Adhesive Heat Packs

Heat packs are vital for keeping temperature-sensitive shipments safe in transit, but not all warmers are the same. The two main types are adhesive and non-adhesive heat packs. While both can help maintain a stable temperature, choosing the right one for your application makes a big difference. Here’s how to decide — and why adhesive packs are now the clear choice for modern shipping needs.

Disclaimer: This article is for informational purposes only. Always follow the specific instructions provided with your UniHeat products to ensure safe and effective use.

What’s the Difference?

Adhesive heat packs come with a sticky backing that allows you to secure them directly to the inside wall of your shipping box, insulated liner, or container. This placement keeps them stable and ensures optimal airflow around the pack. The adhesive sticker does not need to be removed before use—simply peel and stick.

Non-adhesive heat packs do not have this backing and are usually placed loosely in the box. While they work well, they can shift during transit, potentially reducing heat distribution efficiency. For this reason, UniHeat has phased out all non-adhesive warmers in favor of adhesive versions, which we now offer at no extra cost.

When to Use Adhesive Heat Packs

Adhesive heat packs are ideal when:

• You want to prevent movement of the warmer during shipping
• You’re shipping live plants, reptiles, or aquatics that need steady heat distribution
• You want to maximize airflow to the pack for consistent heating
• You’re using vertical or side-mounted packaging where loose packs might fall

Because they stay securely in place, adhesive packs reduce the risk of overheating a specific spot and improve the overall safety of your shipment.

Why We Recommend Adhesive Packs

Adhesive heat packs offer the best balance of control, safety, and heat consistency. By securing them to the container wall, you reduce the chance of direct contact with your product, improve air circulation, and keep the pack in its optimal position throughout the journey. And since they are now the same price as our previous non-adhesive warmers, upgrading comes at no extra charge.

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Frequently Asked Questions

1. Can I place an adhesive heat pack directly on my product?

No. Even with adhesive packs, you should avoid direct contact with the product. Always attach the pack to the inside wall or liner of the box, leaving space for airflow.

2. Do adhesive packs cost more than non-adhesive?

Not anymore—UniHeat adhesive warmers are now the same price as our previous non-adhesive versions, so you can upgrade at no extra cost.

3. Does the adhesive need to be removed before activation?

No. The adhesive sticker stays on the pack. Simply peel off the protective backing and stick it where you want it.

4. Will adhesive packs work in extreme cold?

Yes, but for sub-freezing conditions, we recommend pairing them with insulated packaging and choosing the appropriate duration warmer.

5. Can I still buy non-adhesive warmers?

No. UniHeat has phased out all non-adhesive warmers to offer only the improved adhesive models.