Cryogenic Insulation

Cryogenic and low-temperature applications need materials that stay effective far below ambient and resist moisture ingress. The priority is preventing condensation, heat leak and ice formation while keeping structures light. Hydrophobic rock wool serves cold rooms and chilled lines down to about -50 °C; calcium silicate provides a stable low-temperature envelope; glass wool fills acoustic and duct roles.

Cryogenic & Low-Temperature Application Scenarios

• Cold-storage exterior walls — calcium silicate board resists low temperature and moisture.
• Cold-chain logistics vehicles — calcium silicate keeps a stable low-temp envelope in transit.
• Low-temperature laboratories — calcium silicate shields against external heat intrusion.
• Cold-storage interiors — glass wool in chilled and frozen rooms.
• Refrigerated equipment — glass wool in refrigerators, freezers and display cases.
• Low-temperature pipe insulation — glass wool, and hydrophobic rock wool board, on refrigeration and liquid-nitrogen lines prevents heat leak.

Related Articles

• Industrial Pipe Insulation Materials
• Rock Wool for Petrochemical Refining Insulation
• Rock Wool Marine & Offshore Applications

Cryogenic Insulation Standards

Low-temperature and cryogenic systems are governed less by a single material standard and more by the process safety codes that control flammable and liquefied gases, plus the moisture-control rules that decide whether an insulation system survives. The documents that matter most are the ones that govern LNG and cold containment.

• NFPA 59A — the production, storage and handling standard for liquefied natural gas, which drives insulation and fire-protection choices around LNG tanks, regasification and process lines.
• IMO IGC Code — the International Gas Carrier Code sets construction and insulation requirements for shipborne liquefied-gas carriers, including cargo containment and boil-off control.
• EN 14303 — the European specification for factory-made mineral wool used in building equipment and industrial installations, covering product forms and declared properties for pipe and equipment insulation.
• ASTM C552 — the specification for cellular glass (foam glass) insulation, a load-bearing, vapour-tight material widely used at LNG tank bases and cold supports.

Across all of them, the real design rule is moisture control: a continuous vapour barrier on the warm side, sealed laps and foamed penetrations decide whether the system lasts. The material is secondary to the detailing.

How to Select Cryogenic Insulation

1. Fix the temperature band and duty. Cold storage, cold chain and LNG each rule different materials in or out before conductivity is considered.
2. Design the vapour barrier first. Place it on the warm side, make it continuous and seal every penetration; this is the single biggest determinant of service life.
3. Choose the primary thermal resistance. Closed-cell foam and cellular glass for LNG and structural cold loads; mineral wool for cold rooms, chilled lines and fire breaks down to about -50 °C.
4. Assign the secondary roles. Acoustic linings, duct insulation and fire separation are where glass wool and rock wool earn their place.
5. Detail joints and supports. Cold bridges at supports, slabs and penetrations are where most cryogenic failures start.

See our rock wool board, glass wool blanket and calcium silicate board for the forms used in cold storage, chilled lines and low-temperature equipment.

Cryogenic service spans LNG, aerospace, and industrial gas. Related low-temperature and process applications:

• Marine and offshore insulation for LNG carriers and offshore loading systems
• Pipe insulation for cryogenic transfer and LNG piping
• Power generation insulation for LNG-fueled and combined-cycle plants
• Aerospace and defense insulation for cryogenic propellant systems

Material Map by Service Temperature

Cryogenic and low-temperature service spans three very different bands, and the material that excels in one band is often wrong in another. The map below aligns our product families with the band they serve.

For the engineering reasoning behind these pairings, our cryogenic insulation materials overview compares thermal conductivity curves, and our cold storage and LNG applications article maps them onto real projects.

Vapour Control and Boil-Off: Where Cryogenic Systems Fail

Warm, humid air reaches every cold surface it can. When water vapour condenses and freezes inside an insulation layer it changes the layer's thermal conductivity by an order of magnitude, adds ice loads to supports, and eventually corrodes the pipe it was meant to protect. Three detailing rules decide whether a cryogenic system survives its first humid summer:

• Sealed vapour barrier on the warm side — the membrane must wrap the entire cold volume, with laps glued and penetrations booted, not taped. A single unsealed lap pumps moisture into the layer for the life of the plant.
• Interrupted thermal bridges — pipe supports, hangers and instrument tappings short-circuit the insulation. Load-bearing foam or insulated support blocks under every hard contact keep surface condensation off the structure.
• Boil-off as the acceptance metric — LNG tank and pipe specifications are written in daily boil-off percentage, not conductivity. Every millimetre of missing insulation at a support or valve multiplies into measurable product loss, which is why thin aerogel build-ups on congested runs often beat thicker conventional layers.

Our cryogenic pipe insulation guide walks through the layer-by-layer build-up, and the piping applications page covers the ambient-temperature side of the same networks.