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.

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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
ParameterTypical rangeNotes & selection driver
Hardness70-90 Shore A
DimensionsCustomized to nozzle diameter (typically 10-50mm ID)
Service Life500,000-2,000,000 cycles
Compression Set<15% after 24h at 200°C
Pressure RatingUp to 200 MPa
Temperature Range200-350°C
Chemical ResistanceResistant to most thermoplastics and additives

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 3771, ASTM D2000, SAE J200

Parent Products

This component is used in the following industrial products

Injection Nozzles

Precision components designed to accurately dispense and atomize chemical additives into a process stream within a dosing system.

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Delivery Nozzles

Precision components that direct and control coolant flow in industrial cooling systems.

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Probe head interface

Electrical and mechanical connection point between the multi-sensor probe head and external systems.

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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

Typical Suppliers & Equivalents

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

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 Sealing Gasket/O-ring

Manufacturer profiles associated with Sealing Gasket/O-ring.

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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.

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.

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