Internal Sealing Lips: Temperature Range -40°C to +150°C

Q: How many sealing lips are typically needed for effective protection?

Most industrial applications use 2-4 sealing lips. Multiple lips create redundant sealing barriers that maintain protection even if one lip is compromised, with additional lips providing enhanced protection against high-pressure washdowns or extreme environments.

Q: What materials are best for high-temperature applications?

Silicone rubber (up to 230°C) or fluorosilicone (up to 200°C with chemical resistance) are preferred for high-temperature applications. EPDM is suitable for moderate temperatures up to 150°C and offers excellent weather resistance.

Q: How do sealing lips accommodate different cable diameters?

Sealing lips are designed with sufficient flexibility to accommodate a range of cable diameters (typically ±20% of nominal size). The lips compress more for smaller cables and stretch for larger ones while maintaining sealing pressure through elastic recovery.

Component Specifications

Definition

Internal sealing lips are specialized elastomeric components integrated into wire harness sealing grommets. They consist of multiple flexible protrusions that conform to cable surfaces, creating a compression seal that prevents ingress of liquids, dust, gases, and contaminants while allowing cable movement and vibration isolation. These lips maintain sealing integrity across temperature variations and mechanical stresses.

Working Principle

Internal sealing lips operate on compression sealing principles. When cables pass through the grommet, the flexible lips deform elastically to conform to cable contours, creating radial compression forces. This compression establishes multiple contact points that form labyrinth seals, blocking penetration paths for contaminants while accommodating cable movement through elastic recovery.

Materials

EPDM (Ethylene Propylene Diene Monomer) rubber, silicone rubber, fluorosilicone, neoprene, or thermoplastic elastomers (TPE). Material selection depends on temperature range (-40°C to +150°C typical), chemical resistance, UV stability, and compression set requirements.

Technical Parameters

Parameter	Typical range	Notes & selection driver
IP Rating	IP67 to IP69K
Lip Count	2-6 lips
Lip Thickness	0.5-2.0 mm
Shore Hardness	40-70 Shore A
Compression Set	<20% after 24h at 70°C
Compression Force	0.5-3.0 N per lip
Temperature Range	-40°C to +150°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 3601-1, DIN 3761, SAE J200, ASTM D2000

Parent Products

This component is used in the following industrial products

Industrial Wire Harness Sealing Grommet

Rubber or plastic component that seals and protects wire harnesses passing through panels

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Engineering Analysis

Risks & Mitigation

Lip tearing during cable installation
Compression set leading to seal failure
Chemical degradation in harsh environments
Inadequate sealing with irregular cable surfaces
Temperature-induced hardening or softening

FMEA Triads

Trigger: Improper material selection for operating environment
Failure: Prematerial degradation, loss of elasticity, seal failure
Mitigation: Conduct comprehensive material compatibility testing with expected chemicals and temperature cycles before specification

Trigger: Excessive compression during installation
Failure: Lip tearing, permanent deformation, reduced sealing effectiveness
Mitigation: Implement controlled installation procedures with proper tools, provide installation training, and design lips with tear-resistant geometries

Trigger: Incompatible cable surface texture
Failure: Inadequate sealing contact, fluid ingress paths
Mitigation: Specify cable jacket requirements, test with actual cable samples, consider secondary sealing methods for problematic surfaces

Industrial Ecosystem

Compatible With

Typical Suppliers & Equivalents

Compliance & Inspection

Tolerance

Lip dimensions: ±0.2mm, Hardness: ±5 Shore A, Compression force: ±15% of nominal

Test Method

IP testing per IEC 60529, compression set per ISO 815, temperature cycling per IEC 60068-2-14, fluid immersion per ISO 1817

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

Manufacturers of Internal Sealing Lips

Manufacturer profiles associated with Internal Sealing Lips.

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Frequently Asked Questions

How many sealing lips are typically needed for effective protection?