Description
Passive Ultra-Low Temperature Protection for Portable & Remote ULT Storage
Stirling Ultraguard™ sealed PCM bricks are engineered to extend ultra-low temperature (ULT) holdover time when power is unavailable—providing an added layer of protection for high-value biological samples, clinical trial materials, and temperature-sensitive assets.
Each Ultraguard brick is filled with non-toxic, -70°C Phase Change Material (PCM), specifically designed to deliver up to 8 hours of passive ULT temperature protection when properly conditioned and placed inside a Stirling Ultracold ULT25NEU portable ULT freezer. When applied correctly, Ultraguard™ bricks may also extend temperature holdover time in other ULT freezers, making them a flexible, reusable cold chain solution.
Hold the Cold — Even Without Power
Stirling Ultraguard™ is designed to safeguard critical samples when:
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Electric power is unavailable or unexpectedly lost
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Operating in remote or rural locations without stable infrastructure
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Transporting temperature-sensitive materials over limited distances
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Replacing dry ice with a safer, reusable alternative
By combining Ultraguard™ PCM bricks with the ULT25NEU, laboratories and healthcare providers can extend ULT storage virtually anywhere—regardless of power availability, infrastructure limitations, or dry ice access.
Key Benefits of Stirling Ultraguard™ PCM Bricks
Extended Passive ULT Holdover
Provides up to 8 hours of ultra-low temperature protection when appropriately conditioned and deployed—helping preserve sample integrity during power interruptions or transport.
Designed for Portable & Field ULT Applications
Optimized for use with the ULT25NEU portable ULT freezer, enabling dependable cold chain continuity in remote, decentralized, and mobile clinical environments.
Safer Alternative to Dry Ice
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Non-toxic PCM
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Reusable and easy to handle
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Eliminates dry ice sourcing challenges, handling risks, and regulatory complications
Flexible Compatibility
While designed for the ULT25NEU, Ultraguard™ bricks can be applied to other ULT freezers to enhance passive temperature retention when used appropriately.
Reliable Protection for High-Value Biological Assets
Ideal for safeguarding:
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Biologics and regenerative therapies
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Clinical trial samples
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Diagnostic specimens
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Research materials requiring ULT conditions
Ideal Applications
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Portable and decentralized clinical trials
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Remote healthcare and field research
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Emergency power-loss protection
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Limited-range cold chain transport
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Dry ice replacement strategies
Technical Specifications
Brick Specifications (Per Brick)
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Weight: 2.75 kg (6.06 lbs.)
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Dimensions: 1.5" H × 11.6" D × 6.9" W
(38.1 × 295.1 × 175 mm) -
PCM Type: Hydrated Salts
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Flammability: Non-flammable
Conditioning Requirements
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Conditioning Time (3 bricks): 48 hours in a ULT freezer set to -86°C
Hold Time Performance
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Performance varies by use case; customer validation is recommended
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Tested to provide up to 8 hours of warm-up protection in the ULT25NEU, per the protocol outlined on page 6 of the PCM Operating Manual
Shipping Specifications (3-Brick Kit)
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Transport Classification: Not restricted per DOT, IMDG, and ICAO/IATA regulations
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Total Weight: 9.5 kg (21 lbs.)
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Shipping Dimensions: 7" H × 15" D × 9" W
(177.8 × 381 × 228.6 mm)
Extend ULT Storage — Anywhere
When power is uncertain and sample integrity is non-negotiable, Stirling Ultraguard™ sealed PCM bricks provide dependable, passive ultra-low temperature protection—helping ensure your most valuable biological materials remain safe, stable, and viable.