Seal / Wiper: Temperature Range -40°C to +120°C

Component Specifications

Definition

A dual-function sealing component installed on telescopic boom sections of heavy machinery (excavators, cranes, aerial lifts) that combines a wiper/scraper to remove external contaminants (dust, mud, debris) and a primary seal to retain hydraulic fluid within the cylinder, maintaining system integrity and preventing premature wear.

Working Principle

The wiper lip contacts the moving rod surface to scrape off contaminants during retraction, while the sealing lip maintains constant contact pressure to create a fluid-tight barrier against hydraulic pressure (typically 20-40 MPa), using elastomeric deformation and spring reinforcement to compensate for surface imperfections and thermal expansion.

Materials

Polyurethane (PU 95A-98A hardness) for abrasion resistance, Nitrile rubber (NBR 70-90 Shore A) for oil compatibility, or Fluorocarbon (FKM) for high-temperature applications; often includes stainless steel spring (AISI 304/316) or PTFE anti-extrusion rings.

Technical Parameters

Parameter	Typical range	Notes & selection driver
Hardness	70-98 Shore A
Lip Design	Double-lipped with scraper edge
Rod Diameter	50-200 mm
Pressure Rating	Up to 40 MPa
Temperature Range	-40°C to +120°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 6194, DIN 3760, SAE J515

Parent Products

This component is used in the following industrial products

Boom Sections

Boom sections are the nested, sliding segments that make up a telescopic boom, allowing it to extend and retract to varying lengths.

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Telescopic Sections (for telescopic booms)

Nested cylindrical or box-section components that extend and retract to adjust the length of a telescopic boom.

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Engineering Analysis

Risks & Mitigation

Seal extrusion under high side-loads
Lip hardening from UV/ozone exposure
Contamination ingress due to worn wiper edge
Fluid incompatibility causing swelling/cracking

FMEA Triads

Trigger: Abrasive particles embedding in wiper lip
Failure: Scoring of rod surface leading to fluid leakage
Mitigation: Install external bellows or scraper rings in high-contamination environments

Trigger: Excessive heat from sustained high-pressure operation
Failure: Thermal degradation of elastomer reducing sealing force
Mitigation: Use high-temperature materials (FKM) and ensure adequate cooling

Industrial Ecosystem

Compatible With

Typical Suppliers & Equivalents

Compliance & Inspection

Tolerance

±0.1 mm on sealing diameters per ISO 286-2

Test Method

ISO 7986 (hydraulic fluid leakage test) and ASTM D1414 (compression set resistance)

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 Seal / Wiper

Manufacturer profiles associated with Seal / Wiper.

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Compiled and source-reviewed by the CNFX editorial team. Each manufacturer above links to the page on that company's own website where the product is listed, with the date we checked it. How we source and review

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Frequently Asked Questions

How often should boom section seals be replaced?

Typically every 2,000-5,000 operating hours or during cylinder overhaul, depending on contamination exposure and pressure cycles.

Can seals interchange between different boom manufacturers?

Only with identical dimensional specs (rod diameter, groove width) and material compatibility; always verify OEM cross-reference charts.

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.

Seal / Wiper