INDUSTRY COMPONENT

Internal Sealing Lips

Internal sealing lips are flexible components within industrial wire harness sealing grommets that create a tight environmental seal around cables.

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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
  • 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
Standards
ISO 3601-1, DIN 3761, SAE J200, ASTM D2000

Industry Taxonomies & Aliases

Commonly used trade names and technical identifiers for Internal Sealing Lips.

internal sealing lips wire harness seal cable grommet environmental seal EPDM sealing lip IP67 seal compression seal automotive sealing Internal Sealing Lips in Machinery and Equipment Manufacturing

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

Interchangeable Parts

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

Buyer Feedback

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Frequently Asked Questions

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.

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.

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.

Can I contact factories directly?

Yes, each factory profile provides direct contact information.

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