INDUSTRY COMPONENT

Sealing Gasket/O-ring

Critical sealing component for injection nozzles that prevents material leakage and maintains pressure integrity during plastic injection molding processes.

Component Specifications

Definition
A precision-engineered sealing element specifically designed for injection molding nozzles, creating a hermetic seal between the nozzle tip and mold sprue bushing. This component prevents molten plastic leakage, maintains consistent injection pressure, and ensures proper material flow during the injection phase of the molding cycle. The sealing gasket/O-ring withstands high temperatures (typically 200-300°C), high pressures (up to 200 MPa), and chemical exposure to various polymer materials.
Working Principle
The sealing gasket/O-ring operates on the principle of elastic deformation under compression. When the injection nozzle contacts the mold sprue bushing, the sealing component compresses radially, creating a tight seal that prevents molten plastic from escaping. The elastic recovery of the material maintains constant sealing force throughout the injection cycle, adapting to thermal expansion and mechanical vibrations while preventing backflow and pressure loss.
Materials
High-temperature fluorocarbon rubber (FKM/Viton), perfluoroelastomer (FFKM), silicone rubber (VMQ), or specialized thermoplastic materials. Materials are selected based on temperature resistance (200-350°C), chemical compatibility with specific polymers, compression set resistance (<15% after 24h at 200°C), and hardness (70-90 Shore A).
Technical Parameters
  • Hardness 70-90 Shore A
  • Dimensions Customized to nozzle diameter (typically 10-50mm ID)
  • Service Life 500,000-2,000,000 cycles
  • Compression Set <15% after 24h at 200°C
  • Pressure Rating Up to 200 MPa
  • Temperature Range 200-350°C
  • Chemical Resistance Resistant to most thermoplastics and additives
Standards
ISO 3601-1, DIN 3771, ASTM D2000, SAE J200

Industry Taxonomies & Aliases

Commonly used trade names and technical identifiers for Sealing Gasket/O-ring.

Parent Products

This component is used in the following industrial products

Engineering Analysis

Risks & Mitigation
  • Material leakage causing production defects
  • Pressure loss affecting part quality
  • Thermal degradation leading to seal failure
  • Chemical incompatibility with specialty polymers
  • Improper installation causing premature wear
FMEA Triads
Trigger: Thermal degradation from prolonged exposure to temperatures exceeding material limits
Failure: Loss of elasticity, cracking, and seal failure
Mitigation: Use temperature monitoring systems, select appropriate high-temperature materials (FFKM for >250°C), implement regular thermal cycling checks
Trigger: Chemical attack from aggressive polymer additives or cleaning agents
Failure: Swelling, softening, or hardening of seal material
Mitigation: Material compatibility testing with specific polymers, use chemically resistant materials like FFKM, implement proper cleaning procedures
Trigger: Improper compression during installation
Failure: Insufficient sealing force or excessive compression set
Mitigation: Follow manufacturer installation specifications, use calibrated torque tools, implement installation training programs

Industrial Ecosystem

Compatible With

Interchangeable Parts

Compliance & Inspection

Tolerance
±0.1mm on critical dimensions, surface finish Ra ≤ 0.8μm, concentricity within 0.05mm
Test Method
Pressure decay testing (ISO 2230), compression set testing (ASTM D395), thermal aging (ASTM D573), chemical resistance testing (ASTM D471), dimensional verification per ISO 3601-1

Buyer Feedback

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Frequently Asked Questions

How often should injection nozzle seals be replaced?

Typically every 500,000 to 2,000,000 cycles depending on material, operating conditions, and maintenance. Regular inspection for compression set, cracking, or chemical degradation is recommended.

What causes premature failure of nozzle seals?

Common causes include excessive temperature beyond material limits, chemical incompatibility with specific polymers or additives, improper installation compression, contamination from degraded material, and mechanical damage during nozzle cleaning.

Can different sealing materials be used interchangeably?

No, material selection must match specific operating conditions. FKM works for most applications up to 230°C, FFKM for higher temperatures and aggressive chemicals, while silicone offers better flexibility but lower chemical resistance.

Can I contact factories directly?

Yes, each factory profile provides direct contact information.

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Sealing Gasket / Ring Sealing Gaskets