Insulator/Seal Body: Temperature Range -60°C to +500°C

Q: What is the difference between an insulator and a seal body in this component?

The insulator refers specifically to the portion that provides electrical insulation between conductors, while the seal body refers to the portion that creates the physical barrier against fluid or gas leakage. In many feedthrough designs, these functions are integrated into a single monolithic component.

Q: How do I select the right material for my application?

Consider these factors: 1) Temperature range - ceramics for high temp, plastics for moderate; 2) Voltage requirements - ceramics for high voltage, plastics for low voltage; 3) Chemical exposure - PTFE for aggressive chemicals; 4) Pressure differential - glass or metal-bonded seals for high vacuum; 5) Mechanical stress - reinforced materials for vibration environments.

Q: What are common failure modes of insulator/seal bodies?

Common failures include: dielectric breakdown from voltage spikes, cracking from thermal cycling, seal leakage from improper installation, chemical degradation, and tracking/creepage failures in contaminated environments.

Component Specifications

Definition

The Insulator/Seal Body is a specialized component used in electrical feedthrough assemblies to maintain electrical isolation between conductive elements while simultaneously creating a pressure-tight or hermetic seal between distinct environments (e.g., vacuum to atmosphere, high pressure to low pressure, or different gas/liquid media). It prevents electrical short circuits, contains media, and ensures system integrity in applications ranging from industrial machinery to high-tech equipment.

Working Principle

The component works by combining dielectric materials with sealing geometries. The insulator portion blocks electrical current flow between conductors using high-resistance materials, while the seal body uses compression, bonding, or molded interfaces to prevent fluid or gas leakage. In feedthrough applications, it typically interfaces with metal conductors and housing structures, maintaining both electrical isolation and mechanical sealing through precise dimensional control and material compatibility.

Materials

Common materials include: Alumina (Al2O3) ceramics for high-temperature and high-voltage applications, Glass (borosilicate or sealing glasses) for hermetic seals with matched thermal expansion, PTFE/Teflon for chemical resistance and moderate temperatures, PEEK for high-performance engineering plastics, Silicone rubber for flexible seals, and Epoxy resins for potting and encapsulation. Material selection depends on temperature range (-200°C to +1000°C), voltage rating (up to 100kV), pressure differential (vacuum to 1000+ bar), and chemical compatibility.

Technical Parameters

Parameter	Typical range	Notes & selection driver
CTI	>600V
Leak Rate	<1×10^-9 mbar·l/s
Voltage Rating	1kV to 100kV
Pressure Rating	10^-9 mbar vacuum to 1000 bar
Creepage Distance	5-50 mm depending on voltage
Temperature Range	-60°C to +500°C
Dielectric Strength	>10 kV/mm
Insulation Resistance	>10^12 Ω

Ranges are indicative industry figures for RFQ preparation, not a supplier commitment. Confirm every value and standard with the legal manufacturer before ordering.

Standards

IEC 60601, IEC 62368, DIN 40050, ASTM D149, ASTM D257

Parent Products

This component is used in the following industrial products

Electrical Feedthrough

A sealed component that allows electrical conductors to pass through the wall of a sealed enclosure while maintaining the enclosure's integrity.

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Engineering Analysis

Risks & Mitigation

Dielectric breakdown under overvoltage conditions
Seal failure leading to system contamination or pressure loss
Thermal stress cracking during temperature cycling
Chemical incompatibility with process media
Mechanical damage during installation

FMEA Triads

Trigger: Thermal expansion mismatch between materials
Failure: Cracking of insulator/seal body
Mitigation: Use materials with matched CTE, incorporate stress-relief designs, control temperature gradients during operation

Trigger: Surface contamination or moisture absorption
Failure: Reduced insulation resistance and tracking
Mitigation: Apply hydrophobic coatings, maintain clean environments, specify appropriate creepage distances

Trigger: Improper installation torque or compression
Failure: Seal leakage or mechanical damage
Mitigation: Provide clear installation instructions, specify torque values, design with alignment features

Industrial Ecosystem

Compatible With

Typical Suppliers & Equivalents

Compliance & Inspection

Tolerance

Dimensional tolerances typically ±0.1mm to ±0.01mm depending on application; Electrical tolerance: ±10% on dielectric strength; Leak rate tolerance: < specified maximum value

Test Method

Dielectric strength testing per ASTM D149, Insulation resistance testing per ASTM D257, Helium leak testing per ASTM E493, Thermal cycling testing per IEC 60068-2-14, Pressure testing per ISO 11439

Procurement Evaluation Criteria

A practical evidence checklist for RFQ preparation and supplier evaluation.

Technical documentation

Request current drawings, revision history, and a signed specification sheet.

Manufacturing capability

Verify equipment lists, process limits, capacity, and representative production evidence.

Inspection readiness

Confirm test methods, calibrated equipment, sampling plans, and traceable reports.

Supplier transparency

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Manufacturers of Insulator/Seal Body

Manufacturer profiles associated with Insulator/Seal Body.

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Compiled and source-reviewed by the CNFX editorial team. Each manufacturer above links to the page on that company's own website where the product is listed, with the date we checked it. How we source and review

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Frequently Asked Questions

What is the difference between an insulator and a seal body in this component?