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Plunger Rod Component – Rubber and Plastic Product Manufacturing

Component Specifications

Definition

A critical cylindrical component within medical-grade polypropylene syringes, designed to create a sliding seal within the syringe barrel. It translates manual or automated force to displace medication or fluids with precise volumetric control. Its engineering ensures smooth operation, minimal friction, and compatibility with pharmaceutical formulations.

Working Principle

Operates on the principle of positive displacement. When force is applied to the thumb press, the plunger rod moves linearly within the syringe barrel. This movement creates pressure differentials, forcing the fluid through the needle or outlet. The seal (typically a rubber or elastomeric tip attached to the rod) prevents backflow and ensures accurate dosage delivery.

Materials

Medical-grade polypropylene (PP), complying with USP Class VI, ISO 10993, and FDA 21 CFR. May include additives for color coding (masterbatch) and enhanced rigidity. The tip seal material is typically bromobutyl or chlorobutyl rubber.

Technical Parameters

Glide Force 1-5 N
Length Range 50-150 mm
Sterilization Gamma radiation or Ethylene Oxide (EtO)
Surface Finish Ra ≤ 0.8 μm
Breakloose Force 3-10 N
Diameter Tolerance ±0.05 mm

Standards

ISO 7886-1, ISO 11040-4, DIN EN ISO 13485

Industry Taxonomies & Aliases

Commonly used trade names and technical identifiers for Plunger Rod.

Parent Products

This component is used in the following industrial products

Medical-Grade Polypropylene Syringe

Sterile disposable syringe manufactured from medical-grade polypropylene for clinical applications.

View Product Details

Engineering Analysis

Risks & Mitigation

Material leaching into medication
Sticking or jerky movement (stiction)
Seal failure causing leakage
Breakage under excessive force
Non-compliance with regulatory standards

FMEA Triads

Trigger: Inconsistent polymer molding leading to dimensional variation
Failure: Increased friction or leakage
Mitigation: Implement Statistical Process Control (SPC) on injection molding parameters and 100% automated dimensional inspection.

Trigger: Inadequate sterilization validation
Failure: Patient infection risk
Mitigation: Adhere to validated sterilization cycles (ISO 11135 for EtO, ISO 11137 for radiation) and perform routine biological indicator testing.

Industrial Ecosystem

Compatible With

Interchangeable Parts

Compliance & Inspection

Tolerance

Geometric tolerances per ISO 2768-m, critical dimensions per customer drawing ±0.05mm

Test Method

Dimensional: CMM; Forces: tensile tester with custom fixture; Extractables: HPLC/GC-MS; Biocompatibility: ISO 10993 series

Procurement Evaluation Criteria

Not customer reviews or live demand data. These dimensions support RFQ preparation and supplier evaluation.

Technical documentation

4/5

Manufacturing capability

4/5

Inspection readiness

5/5

Supplier transparency

3/5

These scores are example evaluation dimensions, not real customer ratings, country-specific buyer feedback, or live inquiry activity.

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Frequently Asked Questions

What are the critical quality tests for a plunger rod?

Key tests include dimensional verification, breakloose and glide force measurement, extractables/leachables analysis, biocompatibility testing (ISO 10993), and functionality under simulated use conditions.

Can plunger rods be interchanged between syringe brands?

No, plunger rods are typically designed for specific syringe barrel geometries and seal configurations. Interchangeability is limited unless explicitly validated by the manufacturer to ensure performance and safety.

Can I contact factories directly?

Yes, each factory profile provides direct contact information.

Data Basis

CNFX manufacturer profiles, technical classification, publicly available product information, and ongoing plausibility checks.

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.

Plunger Rod