Cryo Ring Seals
Cryo-Ring™ – Advanced Cryogenic O-Rings for Ultra-Low Temperatures
Cryo-Ring™ seals are precision-engineered to perform reliably in extreme low-temperature conditions. Designed for cryogenic applications, these sealing rings maintain their elasticity, strength, and dimensional stability even as standard elastomers become rigid or fail under extreme cold. They deliver reliable sealing performance under rapid temperature changes and high-pressure variations.
KAF Seal Inc. provides cryogenic O-rings tailored for demanding environments, including LNG systems, liquid nitrogen storage, helium and hydrogen applications, and vacuum chambers. These seals ensure leak-free operation for aerospace systems, laboratory equipment, and industrial cryogenic processes, where maintaining integrity under severe cold is critical.
As an official distributor of Vulcan Engineering Ltd. (UK & USA), we deliver low temperature O-rings that meet global safety and performance standards. Our Cryo-Ring™ solutions combine advanced materials with engineering expertise, delivering a trusted seal for applications requiring precision, durability, and uncompromising performance in ultra-low-temperature environments.
Material Properties
Made of 100% pure PTFE, expanded via a unique process into a consistent, highly fibrillated structure. Upon compression, the fibrils lock together to form a strong, uniform material, impervious to gases and liquids.
It seals under extreme temperatures, pressures and against corrosive media, where conventional materials would break down. Even during application, the material is incredibly resistant to creep, relaxation and cold flow - issues which are often associated with other gasket materials, especially virgin or filled PTFE.
Operating throughout the pH range, resistant to thermal cycling, non-contaminating and therefore can be used in virtually any industry, sealing the simplest to the most difficult of gasket applications.
You can Depend on These High Performance Features
- Wide pressure and temperature range
- Unsurpassed chemical compatibility
- Excellent creep and cold flow resistance
- Will not harden or deteriorate with age
- Low coefficient of friction allows easy removal
- Easily conforms to damaged or pitted flanges
- Low compressive load to seal
- Wide adhesive strip for easy installation
- "Sheet Gasket on a Roll”
- Professional engineering support
TEMPERATURE RANGE:
- -450° F (-268° C) TO
- +600° F (315° C)
PRESSURE RANGE:
- Full Vacuum to 3000 psi
- (20.7 Mpa/ 207 Bar)
CHEMICAL COMPATIBILITY:
- 100% Expanded virgin PTFE
- pH Range: 0 to 14
- Chemically inert except for elemental fluorine and molten alkali metals
FDA COMPLIANT:
- Meets FDA 21 CFR177.1550
LOW CREEP AND COLD FLOW
NON-TOXIC, SILICONE-FREE
NON-CONTAMINATING
NON-PARTICULATING
NON-AGING IN SERVICE
- Aerospace
- Oil and Gas
- Automotive
- Pharmaceutical and Medical
- Chemical Processing
- Power Generation
- Electronics
- Pulp and Paper
- Food and Beverage
- Wastewater Treatment
- Marine
- Semiconductor
Cryo-Ring™ is a specialised sealing solution designed for cryogenic applications where standard O-rings contract and lose sealing force at extreme low temperatures.
| Product Specifications | |
|---|---|
| Product Type | Cryo-Ring™ Seal |
| Design | Spring-energised or specialised cryogenic O-ring |
| Temperature Range | Down to -196°C (cryogenic) and below |
| Key Properties | Maintains sealing force at extreme low temperatures, compensates for material contraction |
| Typical Applications | Liquid nitrogen, LNG, liquid oxygen, cryogenic vessels and pipework |
Why Choose Cryo-Ring™ FEP / PFA Encapsulated Products?
Cryo-Ring™ is the perfect low-cost 'O'-ring sealing solution for cryogenic applications, where low temperature demands are required. Liquid Oxygen or Hydrogen are ideal applications for a Cryo-Ring™ or Cryogenic seals due to it’s lower temperature operating limit of -250°C (-418°F) compared to an encapsulated Silicone core limited to -60°C (-75°F).
With a 302 Stainless Steel spiral wound spring, encapsulated with either an FEP or PFA, a Cryo-Ring™ or Cryogenic seal is used within a wide variety of industries such as transportation, food, pharmaceutical and chemical.
• Widest temperature encapsulated sealing 'O'-ring
• No cold flow problems due to the Stainless Steel elastomer core, unlike solid PTFE ring
• Virtually any cross-section and diameter size or shape of seals can be produced to meet your
application
• Full traceability through production and multi-level automated inspection to ensure high
product quality and reliability
• Guaranteed stock of materials for all BS ISO 3601-1/AS 568 sizes, with short lead times
Cryo-Ring Seals
Material Options
• Encapsulation: FEP / PFA
• Inner core: 302 Stainless Steel spring
Temperature Range
• FEP = -250°C to +205°C (-418°F to +400°F)
• PFA = -250°C to +260°C (-418°F to +500°F)
Venting
For applications where pressure demands exceed 100 bar, ventilation holes are to be placed within the encapsulation to prevent encapsulation rupture.
Sizes and Tolerances
| Cross Section | Cross Section Tolerance |
|---|---|
| 1.78 | -0.08 / +0.12 |
| 2.62 | -0.08 / +0.12 |
| 3.53 | -0.08 / +0.15 |
| 5.33 | -0.13 / +0.20 |
| 6.99 | -0.15 / +0.23 |
| 8.00 | -0.16 / +0.24 |
Note: Dimensions in mm
| Internal Diameter Range | Internal Diameter Tolerance -/+ |
|---|---|
| 12.71 - 25.40 | 0.25 |
| 25.41 - 38.10 | 0.30 |
| 38.11 - 50.80 | 0.45 |
| 50.81 - 63.50 | 0.55 |
| 63.51 - 88.90 | 0.61 |
| 88.91 - 101.60 | 0.71 |
| 101.61 - 127.00 | 0.79 |
| 127.01 - 152.40 | 0.94 |
| 152.41 - 177.80 | 1.02 |
| 177.81 and upwards | 0.50% |
Note: Dimensions in mm
What Are Cryo-Ring™ Cryogenic Seals?
Cryo-Ring™ seals are high-performance cryogenic O-rings crafted from ultra-low-temperature elastomers, sometimes combined with hybrid materials, to deliver reliable sealing in extreme cold. These specialized seals are engineered to handle conditions that challenge conventional materials, including:
