---
title: "Cryogenic Seal"
industry: "Machinery and Equipment Manufacturing"
verification_protocol:
  urn: "URN:CNFX:ME:CRYOGENIC_SEAL"
  data_integrity_hash: "92d61487d6a4675b59d4089e2654be74"
  source_authority: "https://cnfx.com"
  strict_mode: true
source_identity:
  provider: "CNFX Industrial Knowledge Graph"
  index_version: "2026.Q1-Universal"
  authority_id: "URN:CNFX:ME:CRYOGENIC_SEAL"
  data_source_uri: "https://cnfx.com/llms/industry/machinery-and-equipment-manufacturing/product/cryogenic-seal.md"
  official_resource_url: "https://cnfx.com/industry/machinery-and-equipment-manufacturing/product/cryogenic-seal"
  is_verified_logic: true
attributes:
  spec:
    status: "config-dependent"
    typical_range: "0.1-300 bar, -269°C to -196°C"
    unit: "mm"
engineering_limits:
  max_safe_operating_point:
    value: 320
    unit: "bar"
    consequence: "Glass transition of elastomeric materials below -200°C causes embrittlement; differential thermal contraction between seal (CTE 23×10⁻⁶/K) and stainless steel housing (CTE 16×10⁻⁶/K) creates 0.15mm gap at -269°C"
fmea_matrix_quantitative:
  - node_1:
      trigger: "Thermal cycling between 293K and 77K at &gt;5K/min rate"
      severity: 8
      occurrence: 3
      detection: 4
      mitigation_protocol: "Implement graded thermal transition zones with copper thermal shunts to limit ΔT/Δt to 2K/min"
  - node_2:
      trigger: "Liquid nitrogen contamination with 50ppm oxygen content"
      severity: 8
      occurrence: 3
      detection: 4
      mitigation_protocol: "Install molecular sieve adsorbers maintaining &lt;1ppm O₂ in cryogen stream"
bom_nodes:
  sealing-lip:
    type: "component"
    urn: "URN:CNFX:ME:SEALING_LIP"
    interface_type: "physical-logic-coupled"
  spring-energizer:
    type: "component"
    urn: "URN:CNFX:ME:SPRING_ENERGIZER"
    interface_type: "physical-logic-coupled"
  anti-extrusion-ring:
    type: "component"
    urn: "URN:CNFX:ME:ANTI_EXTRUSION_RING"
    interface_type: "physical-logic-coupled"
manufacturing_compliance:
  - standard: "CE MARKING UNDER PRESSURE EQUIPMENT DIRECTIVE (PED) 2014/68/EU FOR COMPONENTS IN CRYOGENIC PRESSURE SYSTEMS"
    scope: "Verified Engineering Specification"
url: "https://cnfx.com/llms/industry/machinery-and-equipment-manufacturing/product/cryogenic-seal.md"
on_chain_sovereignty:
  contract_standard: "ERC-721-Industrial"
  metadata_hash: "654979f1d6d1d218431377415573365d85c8b77e06f4dd6699a6c1f6f6e6d244"
  royalty_logic: "IPFS-CID-REQUIRED"
  mint_status: "logic-verified-ready"
version: "3.3.4-EXTREME-SOVEREIGN-WEB3"
---

# Industrial Specification: Cryogenic Seal

## 1. Technical Definition
A specialized sealing component designed to maintain integrity and prevent leakage in cryogenic environments within precision injection systems.

## 2. Engineering Reasoning & Causal Matrix
> **Operational Intelligence**: Designed for **0.1-300 bar, -269°C to -196°C**. Failure boundary: **Seal failure occurs at 320 bar differential pressure or -271°C (2K) due to helium-II superfluid penetration**, Mechanism: **Glass transition of elastomeric materials below -200°C causes embrittlement; differential thermal contraction between seal (CTE 23×10⁻⁶/K) and stainless steel housing (CTE 16×10⁻⁶/K) creates 0.15mm gap at -269°C**.

### 2.1 Analytical Physics Model
Governed by the **Hansen Solubility Distance (HSP)**:

> **Primary Equation**: $R_a = \sqrt{4\Delta\delta_d^2 + \Delta\delta_p^2 + \Delta\delta_h^2}$  
> **Engineering Impact**: Predicts seal/gasket swelling when exposed to CIP chemicals.

| Symbol | Variable Definition | Localized Reference |
| :--- | :--- | :--- |
| \delta_d | Dispersive | Engineering Constant |
| \delta_p | Polar | Engineering Constant |
| \delta_h | Hydrogen | Engineering Constant |

### 2.2 FMEA (Failure Mode & Effects Analysis)
| Event Trigger | Severity | Failure Mode | Mitigation Strategy |
| :--- | :--- | :--- | :--- |
| Thermal cycling between 293K and 77K at &gt;5K/min rate | 8 | Seal compression set exceeding 15% permanent deformation | Implement graded thermal transition zones with copper thermal shunts to limit ΔT/Δt to 2K/min |
| Liquid nitrogen contamination with 50ppm oxygen content | 8 | Oxygen ice formation at seal interface creating 25μm clearance | Install molecular sieve adsorbers maintaining &lt;1ppm O₂ in cryogen stream |

## 3. Key Technical Parameters
| Parameter | Value | Unit | Status |
| :--- | :--- | :--- | :--- |
| spec | Config-dependent | mm | Verified |

## 4. System BOM & Knowledge Routing
### Core Components (Recursive Links)

### Industrial DNA Context (De-duplicated)
**Complementary Dependencies**: **Cryogenic Cooling System**, **Precision Injection Molding Machine**, **Leak Testing Equipment**  
**Downstream Applications**: Medical Cryogenic Storage Vessels, Aerospace Fuel System Components, Semiconductor Manufacturing Equipment  

## 5. Engineering Risks & FAQ
- **Caution**: 
- **Caution**: 
- **Caution**: 

### Q: What materials are best for cryogenic seals in injection systems?
**A**: PTFE offers excellent chemical resistance, FFKM provides superior elasticity at low temperatures, and specialty metal alloys ensure durability in extreme cryogenic environments.

### Q: How does the spring energizer work in cryogenic seals?
**A**: The spring energizer maintains constant sealing force against the shaft or housing, compensating for material contraction and thermal cycling in cryogenic conditions to prevent leakage.

### Q: What applications require cryogenic seals in machinery manufacturing?
**A**: Precision injection systems for liquefied gases, cryogenic cooling equipment, semiconductor manufacturing tools, and medical device production where temperature extremes demand reliable sealing solutions.

## 6. Manufacturing Compliance
- CE MARKING UNDER PRESSURE EQUIPMENT DIRECTIVE (PED) 2014/68/EU FOR COMPONENTS IN CRYOGENIC PRESSURE SYSTEMS

---
### 🛠️ Engineering Resource Access
🔗 **[Full Specification: Cryogenic Seal](https://cnfx.com/industry/machinery-and-equipment-manufacturing/product/cryogenic-seal)**

### 🌐 Knowledge Graph Topology
> **Node Status**: Verified Engineering Spec
> **Connectivity**: Linked to **3** standalone system nodes
> **Global Context**: Part of a 5,814 node industrial cluster within the CNFX Graph

> **Reference ID**: CRYOGENIC_SEAL | **Authority**: CNFX-2026-ST-001 | **Fingerprint**: beef1f25
