Zurcon® Buffer Seal

In heavy duty applications, leak free performance and high service life cannot be assured by a single sealing element; therefore, specially developed ”system seals” are arranged in series, building a ”tandem configuration”. Each sealing element in a system has its specific function and their interaction needs to be secured to get a redundant sealing system. The primary seal in Zurcon® material has an excellent wear and extrusion resistance under extreme working conditions. It allows a fine lubrication film passing this first barrier, ensuring the necessary lubrication of the secondary sealing element for long service life. The ”tandem arrangement” requires an outstanding back-pumping ability of the primary seal and the secondary seal, if a double acting scraper is installed.

Seal Capabilities

  • Size Range: 40 mm to 140 mm
  • Temperature: -35 °C to 110 °C
  • Speed (max) 1 m/s
  • Pressure (max): 40 MPa

Material Information for the product(s) on this page 

Basic Material
93 (Shore A)
Commercial Description
A proprietary polyurethane material specially developed by Trelleborg Sealing Solutions for the manufacture of sealing elements. It offers high wear resistance, low compression set, a wide operating temperature range, and almost universal media compatibility. This material is most often used in linear and static applications requiring high wear resistance and good sealability. Paired with an N7 elastomer in article numbers ending in Z20N.
Product No. Material Rod Diameter, dN f8/h9 (mm) Groove Diameter, D1 H9 (mm) Groove Width, L1 +0.2 (mm) Price
(per piece)