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
  • Hardness 70-95 Shore A
  • Lip Design Single, double, or multi-lip configurations
  • Rod Diameter 6 mm to 500 mm
  • Pressure Range Up to 500 bar
  • Installation Groove Standardized per ISO 6195
  • Operating Temperature -40°C to +200°C
Standards
ISO 6195, DIN 3760, ISO 3601-3

Industry Taxonomies & Aliases

Commonly used trade names and technical identifiers for Wiper Seal.

wiper seal rod wiper scraper seal hydraulic seal pneumatic seal contamination exclusion ISO 6195 polyurethane seal cylinder seal Wiper Seal in Machinery and Equipment Manufacturing

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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Rod Assembly

A structural component of articulation cylinders that transmits force and 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

Interchangeable Parts

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

Buyer Feedback

★★★★☆ 4.9 / 5.0 (14 reviews)

"The technical documentation for this Wiper Seal is very thorough, especially regarding technical reliability."

"Reliable performance in harsh Machinery and Equipment Manufacturing environments. No issues with the Wiper Seal so far."

"Testing the Wiper Seal now; the technical reliability results are within 1% of the laboratory datasheet."

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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.

Can I contact factories directly?

Yes, each factory profile provides direct contact information.

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