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P4300 High-Performance Polyurethane

P4300 High-Performance Polyurethane offers unequalled sealing capability in high-temperature, high-shock load environments!

Today, there is a wide choice of polyurethane sealing materials available to the seal designer and user. We believe there are major differences in polyurethane compounds and offers P4300 as the premier example of a state-of-the-art polyurethane seal material with major advantages over other urethane formulations.

Three Basic Types of Sealing-Grade Polyurethanes

There are three base formulations or chemical backbones used in compounding modern thermoplastic polyurethane (TPU) seal materials. They are:
  • MDI (diphenylmethane diisocyanate)
  • TODI (diphenyldiisocyanate)
  • PPDI (p-phenylenediisocyanate)
All three produce the abrasion resistance and long wear benefits that are typical of any good polyurethane seal material. There are other physical properties though, such as temperature resistance, compression set resistance, and rebound/resilience, which are also major contributors to effective, long-term sealing characteristics. It is in these latter areas of performance that the properties inherent in MDI, TODI or PPDI formulations become most apparent. P4300 High-performance urethane is an excellent example. This unique PPDI-based formulation yields the best over-all sealing performance of all commercially available TPU formulations currently on the market.

When the  heat s on , P4300 delivers!

One look at the photograph at above right illustrates the superior heat resistance of P4300 over other TPU materials, including those of our competition. P4300 also has superior resilience/rebound characteristics compared to other available TPU materials. The ability to rebound quickly is a major advantage in those sealing applications where there are likely to be severe shock loads and momentary pressure spikes. The enhanced resilience/rebound characteristics of P4300 allow the sealing lips of a rod or piston seal to conform to the moving seal interface with greater rapidity, maintaining the critical sealing line of contact, and thereby allowing less fluid bypass.

Manufactured Exclusively by Parker

Not only does P4300 have the strength and abrasion resistance typical of all polyurethane elastomers, it has the high resilience and low compression set characteristics of nitrile polymers.

Benefits of P4300

  • Performs where other polyurethanes fail
  • Higher temperature service
  • Resists extrusion over a broad pressure range
  • High wear-resistance for extended seal life
  • Maintains sealing lip contact while reacting to rapid changes in pressure/load
  • Excellent resistance to compression set
Physical Property Comparison
Parker P4300
Typical TPU
Specific Gravity
Bayshore Resilience
Ultimate Tensile Strength
8000 psi
6500 psi
100% Modulus (psi)
300% Modulus (psi)
Elongation @ Break Compression Set
70 hrs @ 158° F
70 hrs @ 212° F
Operating Temp. Range
65° to 275° F
65 to 200° F