Hydraulic Wiper & Scraper Seals

Hydraulic Wiper & Scraper Seals

Hydraulic Wiper & Scraper Seals are designed to remove dirt, dust, mud, moisture and other contaminants from reciprocating piston rods before they enter hydraulic cylinders. Installed at the outer end of the cylinder gland, these seals help protect rod seals, guide rings and internal cylinder components from abrasive particles and premature wear.

Wiper seals are essential in hydraulic equipment operating in dusty, muddy or outdoor environments, where contamination can damage sealing surfaces and reduce the service life of hydraulic cylinders.

Unlike primary hydraulic rod seals, wipers are mainly designed for contaminant exclusion rather than high-pressure fluid retention.

Features & Advantages

• Effective Contaminant Removal: Wiping lips remove dust, mud, moisture and abrasive particles from the piston rod surface.

• Rod Seal Protection: Helps reduce contamination-related wear on primary rod seals and internal cylinder components.

• Wear-Resistant Materials: Polyurethane and other engineered materials provide good abrasion resistance under reciprocating movement.

• Single & Double Lip Options: Available with external scraping lips and additional inward-facing lips for selected sealing arrangements.

• Heavy-Duty Scraper Designs: Reinforced and metal-cased options are suitable for demanding operating environments.

• Multiple Installation Types: Snap-in, press-fit and custom groove designs are available according to the wiper profile.

• Standard & Custom Sizes: Suitable for OEM hydraulic cylinders, maintenance and replacement applications.

Materials & Construction

Hydraulic wiper and scraper seals are commonly manufactured from polyurethane (PU/TPU), nitrile rubber (NBR) and engineered polymer materials.

Polyurethane (PU/TPU) provides good wear resistance, mechanical strength and flexibility, making it widely used in hydraulic cylinder wipers for construction and agricultural machinery.

NBR (Nitrile Rubber) offers flexibility and good resistance to mineral oils and lubricants. It is commonly used in general industrial wipers and selected double-lip scraper designs.

Engineered Polyester-Based Materials provide high abrasion resistance and are used in heavy-duty scraper designs exposed to mud, ice and abrasive contamination.

PTFE-Based Materials are used in selected low-friction wiper designs, sometimes combined with elastomeric energizing elements.

Metal-cased wipers may incorporate steel housings to provide secure installation and structural support.

Wiper & Scraper Design Options

Single-Lip Wiper Seals

Feature an outward-facing wiping lip designed to remove contaminants from the rod during retraction. They are commonly used in standard hydraulic cylinders.

Double-Lip Wiper Seals

Combine an external wiping lip with an additional inward-facing lip. Depending on the design, the secondary lip can help control residual oil film and protect the rod sealing system.

Metal-Cased Wiper Seals

Use a rigid metal casing for press-fit installation in suitable cylinder housings. They are commonly used in industrial hydraulic equipment.

Heavy-Duty Scraper Seals

Feature reinforced or specially designed scraping elements for removing heavily adhered dirt, mud and other contaminants in demanding environments.

Typical Applications

Hydraulic wiper and scraper seals are widely used in:

• Excavators and construction machinery

• Agricultural tractors and hydraulic equipment

• Forklifts and material handling equipment

• Cranes and lifting systems

• Hydraulic presses and industrial cylinders

• Mining and earthmoving machinery

• Forestry and off-highway equipment

• Hydraulic cylinder repair and maintenance

Standard & Custom Supply

CORA SEALS supplies hydraulic wiper and scraper seals in various materials, profiles and dimensions for hydraulic cylinder manufacturers, industrial distributors, equipment repair companies and aftermarket replacement applications.

Standard metric and inch sizes, single-lip and double-lip profiles, snap-in wipers and metal-cased designs can be sourced according to drawings, samples or existing part numbers.

For quotations, please provide the piston rod diameter, housing groove dimensions, preferred wiper profile, material and required quantity. Details about operating temperature, rod speed and exposure to dust, mud, water or other contaminants can also help identify a suitable design.