Insulation/Dielectric: CTE 5-15 ppm/°C

Component Specifications

Definition

A specialized dielectric component in sensor probes that electrically isolates conductive elements while maintaining signal transmission quality. It prevents short circuits, reduces electromagnetic interference, and protects sensitive electronics from environmental factors like moisture, temperature fluctuations, and chemical exposure. Critical for maintaining measurement accuracy in industrial applications.

Working Principle

Works by creating a high-resistance barrier between conductive parts of the sensor probe, preventing unwanted current flow while allowing controlled signal transmission through capacitive or inductive coupling where applicable. The dielectric properties (permittivity, dielectric strength) determine insulation effectiveness and signal characteristics.

Materials

Ceramics (alumina, zirconia), polymers (PTFE, PEEK, polyimide), glass, silicone rubber, epoxy resins, mica. Selected based on temperature range (-200°C to +1000°C), dielectric constant (2.1-10), and chemical resistance.

Technical Parameters

Parameter	Typical range	Notes & selection driver
CTE	5-15 ppm/°C
Volume Resistivity	>10^12 Ω·cm
Dielectric Constant	2.1-9.0
Dielectric Strength	10-100 kV/mm
Thermal Conductivity	0.1-30 W/m·K
Operating Temperature	-60°C to +300°C

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

Standards

ISO 6722, IEC 60243, ASTM D149, DIN 40685

Parent Products

This component is used in the following industrial products

Sensor Probe

The sensing element of a level sensor assembly that directly contacts or interacts with the material being measured.

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Engineering Analysis

Risks & Mitigation

Dielectric breakdown under high voltage
Thermal degradation at extreme temperatures
Moisture absorption reducing insulation resistance
Chemical corrosion
Mechanical cracking from vibration

FMEA Triads

Trigger: Thermal cycling beyond material limits
Failure: Cracking and loss of dielectric properties
Mitigation: Use materials with matched CTE, implement thermal barriers, design for expansion

Trigger: Contamination from oils or coolants
Failure: Reduced surface resistivity and tracking
Mitigation: Apply hydrophobic coatings, use sealed designs, specify chemical-resistant materials

Trigger: Mechanical stress from installation
Failure: Physical damage compromising insulation integrity
Mitigation: Design strain relief features, use flexible materials at stress points, provide installation guides

Industrial Ecosystem

Compatible With

Typical Suppliers & Equivalents

Compliance & Inspection

Tolerance

±0.1 mm dimensional, ±5% dielectric properties

Test Method

High-potential testing per IEC 60243, insulation resistance measurement per ASTM D257, thermal cycling per MIL-STD-202

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

Check the legal entity, factory address, ownership, certifications, and direct contacts.

CNFX does not score or rank suppliers. Buyers must verify all claims and documents with the legal manufacturer before ordering.

Manufacturers of Insulation/Dielectric

Manufacturer profiles associated with Insulation/Dielectric.

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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 factors determine insulation material selection for sensor probes?

Temperature range, dielectric strength, chemical compatibility, mechanical stability, moisture resistance, and cost. High-temperature applications use ceramics, while flexible probes use polymers like silicone.

How does insulation failure affect sensor performance?

Causes signal drift, measurement errors, short circuits, complete sensor failure, and potential safety hazards from electrical leakage or arcing.

Can insulation materials be customized for specific environments?

Yes, materials can be formulated for extreme temperatures, radiation resistance, vacuum compatibility, or specific chemical exposures through material engineering and coatings.

Data Basis

Editorial classification, named public sources where available, and source-reviewed manufacturer records. See the editorial policy.

Preliminary Technical Classification

This page supports structured research, RFQ preparation, and supplier evaluation. It does not replace buyer-led supplier qualification, standards review, or technical approval.

Insulation/Dielectric