Piston Seals

Piston seals are used in cylinders to seal liquids. Piston seals are located in the cylinder head and seal against the cylinder wall, thus preventing leakage of liquids past the cylinder head.

NewDealSeals supplies a wide range of piston seals as an economic alternative to e.g. AQ Seal®, Bal Seal®, Double Delta®, Flexiseal®, Glyd Ring®, MSE® Seal, Omniseal®, Rimseal®, Stepseal®, VL Seal®, Variseal® and Wynseal®.

Advantages Piston Seal

  1. Assembly on one-piece pistons.
  2. Minimal break-out and dynamic slide friction. Therefore no stick-slip. Steady movement is guaranteed even at low velocities.
  3. Low wear.
  4. High extrusion resistance.
  5. High temperature resistance.
  6. Compatibility with nearly all media due to the high chemical resistance of the piston sealing ring, and a wide selection of O-ring compounds.
  7. Available in diameters up to 1500 mm.

Technical Specifications

Type of movement
Rotary, reciprocating

Surface speed

≤ 4,0 m/s

Working pressure

Standard:≤ 400 bar

In case of reduced extrusion gap (H7/f7):≤ 600 bar

Profile P3:≤ 160 bar

Profile P4:≤ 16 bar

Working temperature

Standard:-30 to +108°C

With FKM O-Ring:-25 to +204°C

Profile P4:-30 to +80°C

Standard materials O-Rings


Standard materials Piston Seals

Profile P1: NDS-150, PTFE modified, NDS-66-, PTFE + 60% bronze

Profile P2:NDS-123, PTFE 15% glass + 5% molybdenum disulfide, NDS-150, PTFE modified, NDS-660, PTFE + 60% bronze

Profile P3: NDS-150, PTFE modified

Profile P4:

NDS-225, PTFE + 25% carbon

Profiles Piston Seals


For single-acting pistons in hydraulic cylinders

Profile P1 is particularly suitable for single-acting pistons in control cylinders, in servo controlled systems, machine tools and in construction machinery. Optimal sealing performance obtained if used in tandem with Guide Ring.
Good back-transport of oil film due to special shape of sealing edge.


For double-acting pistons in hydraulic cylinders

Profile P2 is suitable for double-acting pistons in control cylinders, servo-controlled systems, machine tools, quick acting and steering cylinders.
Capable of sealing dynamic pressure from both sides (bidirectional) at high pressure.


For dynamic applications

Profile P3 is appropriate for dynamic applications as an alternative to an O-ring in situations where sealing performance and friction have to be optimised.
Can be used in existing O-ring grooves.


For double-acting in pneumatic cylinders

Profile P4 is suitable for double-acting pneumatic pistons, e.g. in control cylinders, servo assisted equipment, and in quick-acting cylinders.
Can be used for pneumatic applications.


Color Temperature Application Information
White -190 to +230 °C Chemical Industry, Food Industry High chemical resistance
PTFE +15% glass, +5% molybdenum disulfide
Grey -190 to +290 °C Medium-duty

High chemical resistance, High creep resistance, Electrical properties like virgin PTFE


PTFE +25% carbon
Black -190 to +315 °C Pneumatics Rotary sealing High wear and creep resistance
PTFE +10% carbon fibre
Black -260 to +310 °C Water hydraulics, Seawater, Short strokes with high frequency Very good wear properties
PTFE +15% graphite
Antrachite -190 to +230 °C Low mechanical stress, Soft sealing Surfaces Chemical resistance
PTFE + mineral fibers
Antrachite -200 to +260 °C Medium and heavy mechanical stress, Hydraulic applications Chemical, wear and creep resistance
PTFE +40% bronze
Bronze -156 to +260 °C Medium and heavy mechanical stress, Hydraulic applications

Outstanding wear and creep resistance

PTFE +60% bronze
Bronze -156 to +260 °C Heavy mechanical stress, Hydraulic applications Outstanding wear and creep resistance
PTFE + polyimide
Tan -260 to +310 °C High speed rotating applications Use against soft metals

Related PTFE Seals

Back-up Rings

Back-up rings are used for static and dynamic applications in connection with O-rings, to prevent extrusion of the O-ring into the diametrical clearance.

Back-up Rings ►

Rotary Seals

Rotary seals are used in applications with oscillating or rotating movements in order to retain liquid lubricants and to prevent the penetration of dirt and water.

Rotary seals ►

Spring Energized Seals

The Synering® system is an advanced sealing concept designed to meet extreme demands regarding temperature, medium, etc. which cannot be covered by conventional sealing compounds.

Spring Energized Seals ► 



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NewDealSeals B.V.

+31 (0) 226 362 233


Boezemschop 8, Breekland, 1724 BJ Oudkarspel, The Netherlands