Plunger Rod: Length Range 50-150 mm, Glide Force 1-5 N

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

Parameter	Typical range	Notes & selection driver
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

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

Parent Products

This component is used in the following industrial products

Medical-Grade Polypropylene Syringe

Sterile disposable syringe made from medical-grade polypropylene for clinical fluid administration.

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

Typical Suppliers & Equivalents

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

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 Plunger Rod

Manufacturer profiles associated with Plunger Rod.

Sourcing Plunger Rod from China?

Tell us your specification and target quantity — we will match it against manufacturer records and come back with the factories that fit.

Request manufacturers We manufacture this

Manufacturer listings support early research and capability understanding. They are not certification, ranking, or transaction guarantees.

Related Components

Sealant Layer

Sealant layer in multi-layer co-extruded barrier films for hermetic sealing and product protection.

Tie Layer

Tie layer is a bonding component in multi-layer co-extruded barrier films that ensures adhesion between incompatible polymer layers.

Mold Release Coating

Specialized coating applied to molds to facilitate easy release of silicone seal rings during manufacturing.

Silicone Polymer Base

Silicone polymer base is a high-temperature resistant polymer material used as the foundational component in silicone rubber compounds for industrial applications.

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.

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.

Plunger Rod