Polar Tech RB15 Re-Freeze-R-Brix Foam Cold Pack, Case of 6 — 4.5 x 4 x 1.5 in Rigid, Reusable Refrigerant

Polar Tech RB15 Re-Freeze-R-Brix is a rigid, reusable foam cold pack that holds its shape frozen or thawed to keep perishable shipments chilled or protected from freezing.

Designed as a compact, durable refrigerant block, the RB15 Re-Freeze-R-Brix combines rigid foam construction with a sealed heavy-plastic pouch to deliver long-lasting temperature control inside insulated containers. It works like a small, reliable refrigerator in a bag: when frozen it keeps items cold for extended periods, and when purposefully warmed it can release heat to prevent fragile goods from freezing. Each case contains six 4-1/2" x 4" x 1-1/2" units that are non-toxic and intended for repeated reuse, making them economical for shipping, catering, medical transport packaging, and outdoor activities.

How long will an RB15 block keep items cold during transit?

Cooling duration depends on box insulation, ambient temperature, and load size, but the RB15’s rigid foam formulation provides steady thermal mass for extended chilling. Used inside proper insulated containers, these blocks maintain lower temperatures longer than gel packs of similar size because they retain shape and thermal capacity when thawed.

• Rigid foam holds cold longer than thin gel alternatives
• Best performance when combined with insulated boxes or coolers
• Multiple blocks stacked increase total chill time

Can Re-Freeze-R-Brix prevent products from freezing?

Yes — when warmed to a controlled temperature and placed around sensitive items inside insulated packaging, the RB15 radiates heat gradually to protect contents from freezing. This makes it useful in mixed-temperature shipments where some items must be kept just above freezing while others remain chilled.

• Warm the block before packing to use as a heat source
• Sustained, gentle heat release reduces freezing risk in insulated containers
• Non-toxic, sealed pouch offers safe contact with packaging materials

What makes the RB15 durable and reusable?

The RB15 is built from a rigid foam core sealed inside a heavy-duty plastic pouch that resists punctures and maintains shape after many freeze-thaw cycles. Its solid structure prevents leaks and deformation common with soft gel packs, while being easy to clean and store between uses.

• Rigid foam maintains shape whether frozen or thawed
• Heavy plastic envelope resists tears and punctures
• Wipe-clean surface for hygienic reuse

How should I integrate RB15 blocks into my packing process?

For best results, freeze blocks fully before packing, arrange them around the product to create an even thermal barrier, and use adequate insulation. For temperature-sensitive shipments, combine multiple blocks and consider phase-change timing (freeze or warm as needed) to match transit duration and external conditions.

• Freeze flat prior to packing for maximum cold hold time
• Place blocks on all sides of the product for even cooling
• Use with insulated liners or boxes to extend performance

Who is this for: Polar Tech RB15 Re-Freeze-R-Brix is aimed at businesses and individuals who ship perishables, run catering or meal-prep services, transport lab samples, or need dependable cooling for outdoor or recreational use. It suits operations seeking a cost-effective, reusable refrigerant that keeps shape, resists leaks, and can be warmed or frozen depending on whether preventing freezing or maintaining chill is the priority. If you require a compact, robust cold pack that performs reliably across multiple uses and packaging scenarios, the RB15 offers a practical solution.