INDUSTRY COMPONENT

Wiper Seal

A wiper seal is a critical sealing component that prevents contaminants from entering hydraulic or pneumatic systems while allowing smooth rod movement.

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Component Specifications

Definition
A wiper seal, also known as a scraper seal or rod wiper, is installed in the rod gland or end cap of hydraulic or pneumatic cylinders. Its primary function is to scrape off dust, dirt, moisture, and other external contaminants from the piston rod as it retracts, preventing these particles from entering the cylinder interior and damaging internal seals, bearings, or fluid systems. It also helps retain lubrication on the rod surface and provides secondary sealing against fluid leakage.
Working Principle
The wiper seal operates through mechanical scraping action and elastic deformation. As the piston rod moves inward, the seal's lip (typically made of flexible material) contacts the rod surface under slight interference fit. This contact creates a wiping effect that removes contaminants adhering to the rod. The seal's geometry and material elasticity maintain consistent contact pressure while allowing low-friction rod movement. Some designs incorporate multiple lips or integrated scraper elements for enhanced contaminant exclusion.
Materials
Common materials include polyurethane (PU), nitrile rubber (NBR), fluoroelastomer (FKM/Viton), polytetrafluoroethylene (PTFE), or composite materials. Material selection depends on application temperature (-40°C to +200°C typical range), fluid compatibility, pressure (up to 500 bar), and environmental conditions. Hardness typically ranges from 70 to 95 Shore A.
Technical Parameters
ParameterTypical rangeNotes & selection driver
Hardness70-95 Shore A
Lip DesignSingle, double, or multi-lip configurations
Rod Diameter6 mm to 500 mm
Pressure RangeUp to 500 bar
Installation GrooveStandardized per ISO 6195
Operating Temperature-40°C to +200°C

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 6195, DIN 3760, ISO 3601-3

Parent Products

This component is used in the following industrial products

Rod Gland/End Cap

A sealing and structural component at the end of a hydraulic or pneumatic cylinder rod.

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Piston Rod & Seal

A critical assembly consisting of the piston rod and its sealing system that prevents fluid leakage while transmitting linear motion in drive mechanisms.

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Guide Rail Interface

The interface component that connects the carriage/travelling block to the guide rail system, ensuring precise alignment and smooth linear motion.

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Engineering Analysis

Risks & Mitigation
  • Contamination ingress leading to system failure
  • Improper installation causing seal damage
  • Material incompatibility with operating fluids
  • Excessive wear from abrasive environments
  • Temperature extremes causing material degradation
FMEA Triads
Trigger: Abrasive contaminants on rod surface
Failure: Premature seal lip wear and loss of wiping effectiveness
Mitigation: Use dual-lip wipers with integrated scraper rings; implement rod surface hardening (chrome plating); install external bellows or boots
Trigger: Chemical incompatibility with hydraulic fluid
Failure: Seal swelling, cracking, or hardening leading to leakage
Mitigation: Select FKM or HNBR materials for aggressive fluids; verify fluid compatibility charts; conduct material testing
Trigger: Improper groove dimensions or installation damage
Failure: Seal extrusion, twisting, or incomplete contaminant exclusion
Mitigation: Follow ISO 6195 groove standards; use installation tools; verify groove surface finish (Ra ≤ 0.8 μm)

Industrial Ecosystem

Compatible With

Typical Suppliers & Equivalents

Compliance & Inspection

Tolerance
Radial interference: 0.2-0.8 mm depending on rod diameter; Groove depth tolerance: ±0.1 mm
Test Method
ISO 7986: Contamination exclusion testing; ISO 6072: Fluid compatibility testing; DIN 53504: Material hardness testing

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 Wiper Seal

Manufacturer profiles associated with Wiper Seal.

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Related Components

Chrome Plating
Hard chrome plating is an electroplating process that deposits a layer of chromium onto metal surfaces to enhance wear resistance, corrosion protection, and reduce friction for hydraulic cylinder piston rods.
Upper Tool (Punch)
Upper Tool (Punch) is the active forming component in metal plate bending machines that applies precise downward force to create bends in sheet metal.
Main Frame
The main frame is the primary structural component of a hydraulic press, providing rigidity and stability to withstand high compressive forces during metal forming operations.
Shaft Bearing
Precision component supporting rotating shafts in vibration motors to reduce friction and maintain alignment.

Frequently Asked Questions

What is the difference between a wiper seal and a rod seal?

A wiper seal primarily excludes external contaminants from entering the cylinder, while a rod seal primarily prevents internal fluid leakage. Wiper seals are installed on the external side of the rod gland.

How often should wiper seals be replaced?

Replacement intervals depend on operating conditions, typically 1-5 years or 1-10 million cycles. Signs for replacement include visible wear, increased contamination ingress, or lubrication loss.

Can wiper seals handle high-speed applications?

Yes, specially designed wiper seals with low-friction materials (like PTFE composites) can accommodate rod speeds up to 1.5 m/s, though standard designs typically handle 0.5 m/s.

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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