This twin lip, asymmetric, single-acting piston seal with precision trimmed sealing lips provides a dry sealing solution in light and medium-duty application. The sealing lips are trimmed at an angle to give optimal rod sealing performance.

Designed to have an interference on the piston spigot diameter and has a secondary lip, the secondary sealing lip located behind the primary sealing lip improves stability of the seal in the piston. The outer dynamic lip is shorter and more robust to improving sealing and compression set characteristics over conventional, symmetrical U-rings.

The R18 is moulded in high-performance polyurethane, for easy installation and excellent low temperature performance. Depending on tube bore finish, the R18 is also offered in polyurethane.

Single-acting hydraulic cylinder piston sealing only: For single-acting piston seal applications exclusively; asymmetric twin‑lip design for one‑way pressure sealing in piston chambers; not for rod or double‑acting use.

Light & medium‑duty stable sealing: Precision trimmed lips with primary + secondary lip for enhanced stability and extrusion resistance; delivers dry sealing superior to conventional symmetrical U‑rings.

Medium‑pressure general hydraulic systems: Rated up to 400bar; polyurethane offers excellent wear & extrusion resistance for industrial, construction, and agricultural machinery.

Low‑temperature equipment: Operates from -45°C to 110°C with outstanding low‑temp performance; ideal for cold chain, cold‑region construction machinery, and outdoor hydraulic units.

Low‑speed reciprocating mechanisms: Max speed 1m/s; used in machine tools, fixtures, automation, small hydraulic power units, and lift tables.

Multi‑fluid compatible applications: Recommended for mineral oils, HFB emulsions, synthetic esters; compatible with water, HFA, HFC, air/nitrogen; not suitable for phosphate ester fluids; fits most industrial hydraulic media.

Long‑life durable machinery: Short, robust outer dynamic lip + secondary lip for lubrication & primary lip protection; low friction & long service life for logistics, sanitation, and mining auxiliary cylinders.

Easy installation & service replacement: Simple to install, available in metric & inch sizes; cost‑effective high‑performance single‑acting piston seal for maintenance and volume production.