Polar Tech rigid foam refrigerant pack RB15 - 4-1/2" x 4" x 1-1/2" reusable leak-proof cooler pack, dense thermal retention

This compact foam coolant block freezes solid but remains structurally rigid when thawed, making it a reliable chilled pack for shipping, storage, and portable coolers. Each Re-Freeze-R-Brix is sealed in a heavy-duty plastic pouch to prevent leaks and is formulated to be non-toxic and reusable. The RB15 size (4-1/2" x 4" x 1-1/2") balances surface area and thickness to deliver extended cold retention while fitting into insulated containers, lunch boxes, and small shipping boxes.

How does the Re-Freeze-R-Brix keep items cold for longer?

The RB15 combines a dense rigid foam core with a sealed pouch that holds thermal energy longer than loose ice. Because the material stays solid and maintains contact with contents, it slows heat transfer and preserves chilled temperatures without messy meltwater. It’s especially effective when used inside properly insulated carriers or grouped with other cold packs.

• Rigid foam retains shape for consistent surface contact
• Sealed heavy-plastic pouch prevents leaks and drips
• Dense thermal mass releases cold slowly for extended duration
• Designed to fit small to medium insulated containers

Can I reuse these packs and how do I store them?

Yes — the Re-Freeze-R-Brix units are made to be reused repeatedly. After thawing, simply refreeze the pack flat in your freezer. Store them clean and dry in the freezer or a cool, dry place between uses to maintain performance and longevity.

• Refreeze flat for consistent freezing
• Wipe clean before storage to avoid odors or contamination
• Durable pouch resists punctures under normal handling

Will these prevent items from freezing or protect against thawing?

The RB15 can both help protect items from freezing when used with proper insulation and guard against thawing by releasing stored cold gradually. When warmed, the pack gives off heat more slowly than water ice, which can reduce the risk of freezing-sensitive products and extend chilled transit life for perishables.

• Helps prevent accidental freezing by moderating temperature swings
• Reduces thawing risk for chilled goods in transit
• Works best when paired with insulated packaging or multiple packs

What size and quantity should I use for shipping or cooler use?

The RB15's 4-1/2" x 4" x 1-1/2" footprint is suitable for small to medium shipments, lunch coolers, and multiple-pack assemblies. For larger shipments, use several units distributed around the load to maintain even cooling. Consider insulating material thickness and ambient temperature when deciding how many packs you need.

• Single pack: small personal cooler or lunch tote
• Two to four packs: medium insulated box or multiple-item cooler
• Six or more: larger shipments or extended transit in warm conditions

Who is this for: Polar Tech RB15 Re-Freeze-R-Brix suits small businesses, e-commerce shippers, anglers, outdoor enthusiasts, and anyone who needs a clean, reusable cold source that holds shape and minimizes mess. Its compact size and durable sealed pouch make it a practical choice for meal delivery, sample transport, picnic coolers, and as a component in insulated packaging systems where consistent, reliable cooling is required.