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Seals and Rod Wipers

ISCA stocks and manufactures a wide variety of seal and sealing technology. Ask our seals experts for advice call ISCA on 02 9913 8566.


Rod Wipers

  • Polyurethane Loaded Lip Seal
  • Z Seals
  • Seal compound variations
  • Bonded Seal
  • Metric Double Acting Seal
  • Crown Seal
  • T-Seal
  • Piston Cup
  • 8400 Series
  • Cast Iron Piston Ring
  • AN 959 Wiper
  • D Wipers
  • H & K Wipers
  • Metal Case Wipers
  • Wear Rings
  • 8600 Series
  • Hydro-Wype Scrapers

Polyurethane Loaded Lip Seals

This seal is most widely used to replace most existing packings and /or O-rings. It comes in Standard, Square B, Deep and Type B. The Standard polyseal is best used where low friction is required, and a light lubricating oil is desired. The standard polyseal when used as an excluder is also a very effective wiper. The loaded lip design insures a positive seal and wiping action at both the outer diameter and the gland groove of the hydraulic cylinder rod. The Square B type is ideal for when a dry seal is required and where space is at a premium. This features a beveled lip that increases the scraping action of the seal.

The Deep Polyseal offers increased stability in high pressure applications due to its rectangular shape. It makes an excellent choice for contaminated environments.

The Type B Polyseal features a back-bevelled sealing lip for maximum film-breaking ability. This seal is ideal for whenever a dry seal is required.

Z Seals

This seal has a lip-like configuration with a fluorotrel base. This design gives both squeeze sealing force and automatic lip sealing force. The seal performs well under high pressure and high temperatures, offering the widest range of temperature and chemical resistance. The Z Seal is therefore ideal for extreme environmental conditions. The Deep Z Seal is a redundant-lip seal for rod applications in all types of environments. The temperature range of a Deep Z Seal is -65°F to +400°F.

Variation in Seal Compounds


These seals are a standard type seal, distinguished by a fluorotrel rather than a polyurethane compound. The fluorotrel is tougher than the polyurethane, and is a tough, wear resistant material for use at elevated temperatures of up to 135°C. It is also superior in fluid resistance capability.

Fluorocarbon (FKM)

The advantage of Viton® Seals is that they withstand higher temperatures (up to 400°F) than the polyurethane seals. Viton® is tough and wear resistant, and is not subject to the compression that the polyurethane seals experience under higher pressures. Viton® is not recommended to seal at temperatures below -20°F.

Bonded Seals

The Dowty Bonded Seal was originally designed to replace the copper type washers in high-pressure systems. Simple in construction, the gasket comprises a metal annulus, square or rectangular in section, to which an elastomeric ring of trapezoidal section is bonded. The metal ring resists the bursting forces and limits the deformation of the elastomeric element. The key benefits are; reliable high and low pressure sealing, wide temperature capability, prevention of over compression and extrusion via the metal ring, a large range of elastomers and metals, and full traceability. The 300 series is an Aerospace grade, and the 400 series is the industrial grade. (For more information, refer to the our catalogue.) Metric Double Acting Seals

Selemaster piston seals (DSM)

These are designed to meet the needs of hydraulic equipment operating at high pressures, subject to severe vibration and shock loading. The DSM is used in piston applications incorporating guide ring/anti-extrusion ring. The main advantages are; effective sealing during vibration and shock loading, extrusion resistance at high pressure and no need for housing equipment. These piston seals will operate in severe shock pressure loading and vibration, as experienced on earth moving machines, excavator, lifts, etc. The temperature ranges for applications are -40ºC to +130ºC. Ideal fluids for application are mineral based fluids, water/ glycol and water emulsion.

Balsele (B, D11W)

The Balsele is a radial compression seal of an elastomeric sealing element which automatically adjusts itself with the changes in pressure and has an integral fabric reinforcement for support. It is available as a rod seal and as a piston seal. The principle advantages of Balseles are small section, ease of assembly and low cost.

Type B is recommended for gland seals or single acting pistons up to a maximum operating pressure of 250 Bar. Depending on extrusion gaps. Balsele D11W is recommended for use in double acting applications and incorporates as a combined guide ring/ anti-extrusion ring suitable for pressures up to 500Bars.

Balmaster Seals (DBM)

Balmaster Seals are an economic solution to the sealing of double acting cylinders. They are recommended for these cylinders where efficient sealing at both high and low pressures is demanded. They can also be applied to single acting cylinders where the non-pressurised side is lubricated. The recommended temperature range for the Balmaster seals to operate under are between -40°C to +130°C.

Crown Seals

The Crown Seal is a squeeze type seal. An O-ring is used as a loading spring and to seal the static surface. The crowned sealing surface produces a positive seal from vacuum to high pressure. The Crown Seal also acts as an excellent anti-extrusion device for the O-ring, as well as adding stability to the seal. These positive, bi-directional Crown Seals can be used for either rod or pistons, directly replacing T-seals, O-rings and Quad Seals. The Crown Seal can be used in all petroleum, water/glycol, water/oil, emulsion based hydraulic fluids. The recommended temperature range for Crown Seals are between -54°C to +105°C.


T-Seals were originally developed to preserve the advantages of O-rings in dynamic fluid power applications, whilst overcoming their major drawbacks. The T-Seal is useful where it is likely that extrusion of the O-Ring, or spiral failure (due to rolling of the O-ring in the seal) will occur. These seals also provide excellent chemical resistance and a temperature range of -65ºF to +450ºF. T-seals are bi-directional for either piston or rod applications.

AN 959 Wipers

This wiper is considered to be a light duty, snap-in wiper that will retrofit into glands prescribed in MS-33675 for corresponding dash numbers of MS-28776.

D Wipers

This wiper is considered to be a step up from the AN959 wiper, and is ideal for large diameter applications and more contaminated environments. The D wiper is used most often on rod diameters of 6 inches or larger.

H & K Wipers

These are one-piece snap-in type rod wipers, designed for light duty applications. The U cup portion of these wipers serves as a secondary safeguard against leakage past the primary rod seal. The only difference between the H and K wiper is that they do not retrofit each other’s grooves.

Metal Case Wipers(MC)

These wipers consist of a polyurethane element encased in a “J” shape metal retainer. The standard type features 90 shore A polyurethane. The design enables it to provide excellent mechanical bonding, as the element overlaps a portion of the retainer. It also facilitates good chemical bonding. The metal case wiper has several advantages over the conventional wiper. It is excellent for severe applications such as frozen or dried mud or weld splatter. It can also operate in temperatures as low as -65°F.

Wear Rings

Wear Rings are made of reinforced nylon. They provide high compressive strength and load bearing capabilities. Wear Rings support, guide, and reduce friction between the fixed and reciprocating parts of hydraulic and pneumatic cylinders. They may be utilised in both rod and piston applications. The main advantage of Wear Rings is that they prevent metal-to-metal contact which can score cylinder bores and rods, resulting in seal damage. They can also extend seal life as they eliminate the excessive side loading experienced by the seal Piston Cups.

There are two types of the Piston Cups; a standard style for general pneumatic and hydraulic applications (CS), and a thin wall style that provides a lower friction at light pressures (CT).

8600 Series

These are homogenous rubber double lip seal wipers. They are designed for use in connection with homogenous rubber or fabric reinforced U-Cup rod seals. They are also ideal for use with other types of conventional packings in light to medium duty applications where operating conditions require positive wiping action, but where extreme deposits of foreign matter are not present. The standard compound for 8600 series wipers is 80 durometer Nitrile.

8400 Series U-Packing

The 8400 series are designed for use in pneumatic and hydraulic cylinders, especially in low speed, low pressure situations. The advantage of these U-packing is that they provide an extremely smooth, steady movement with less breakaway force required because of their inherent low friction. They may be used in any groove design that has “U” type packings of the same cross sectional dimensions. Cast Iron Piston Rings

These piston rings allow sealing in both directions in double acting cylinder applications. They also have the ability to pass sidewall ports without deformation or clipping while sealing at pressures as high as 10,000 psi. The main features of the cast iron piston ring are; it will operate in temperatures up to 500°F, it can withstand high surge loads, it is compatible with most hydraulic fluids and minimises leakage via the interlocking joint.

Hydro-Wype Scrapers

These are a type of wiper, made of copper based alloys. They are designed to absorb all the abuses and impacts that may be encountered in the initial shock of a landing gear or the reversing stroke of an accumulator cylinder piston rod. The scraper edge is designed to remove all types of oil, frost, mud or ice from the piston rod. Hydro-Wype Scraper Rings can be used over a wide range of temperatures extending from -65°F to +500°F.

The prestressed tensioners compensate for expansion and contraction due to temperature, and for any wear that may result in the Scraper Ring or piston rod. Some common applications for the Hydro-Wypes include in farm hydraulics, road and contractors machinery, hydraulic presses, machine tools and oil well machinery.