PolyMod Technologies

PolyMod® Advantage
Article Index
PolyMod® Advantage
Reduced Friction
Reduced Abrasive Wear = Improved Life
Improved Performance
Page 5
All Pages

 

Having elastomer friction and wear problems?  

PolyMod® high performance materials could be the solution. 

Seal friction can negatively affect system performance, efficiency and life.  PolyMod® high performance thermoset and thermoplastic rubber materials are polymer modified to have very low coefficients of friction and optimized wear life giving them significant advantages over conventional elastomer seal materials.

The PolyMod® process does not adversely affect the engineered properties of the material or aging properties.  It can significantly enhance performance, efficiency, and longevity of the material in addition to reducing both static and dynamic coefficients of friction. And because the PolyMod® process can be performed on most thermoset and thermoplastic rubber materials, this gives you a wide variety of high performance material options for maximizing system performance. 

Seal performance is improved using PolyMod® seal materials. This has been demonstrated in both controlled tests and actual service applications (see Application Highlights).

PolyMod® materials have:

  • Reduced Friction
  • Reduced Abrasive Wear
  • Increased Life
  • Improved Performance
  • Lower Heat Buildup
  • Long Seal Life
  • Consistent Performance

 

Unlike other friction reduction methods, such as coatings, impregnations, and internal lubes, 

PolyMod®

  • Is permanent
  • Lasts the Seal’s Lifetime
  • Does Not Add Impurities
    • Safe for Medical and Food Applications
    • No System Contamination
  • Does Not Adversely Modify Material Properties
    • Materials will still meet the same specifications (AS/MIL, NSF, UL, etc.)
  • Does Not Dimensionally Change a Seal
  • Can be performed on most thermoset and thermoplastic rubber materials

 

 

 



 

 

 

PolyMod® high performance materials have significantly less friction than conventional elastomers.

 

 

Breakout Friction Values PolyMod® High Performance Materials vs. Standard Materials

Running Friction Values PolyMod® High Performance Materials vs. Standard Materials

Running friction values graph

Evaluations using ASTM D1894

 


 

 

Even in hydraulic systems, seal materials wear and abrade. PolyMod® provides abrasion resistance and improves seal life.

PolyMod® high performance materials show significantly improvement in wear life over conventional elastomers.

 

Abrasive Wear

PolyMod® High Performance Material

Tabor abrasion graph

Evaluations using Taber Abrasion (ASTM D3389)
H-18 wheels at 1 kg loading
Values are the mean of three separate runs taken
The wear of the PolyMod materials is shown as a factor less than 1.0, indicating improved wear resistance when compared to the standard materials base-lined at 1.


 

PolyMod® high performance materials because of their enhanced properties run cooler and are tougher than conventional elastomers, therefore, they do not suffer the accelerated degradation of conventional elastomers.

PolyMod® High Performance vs. Standard NBR O-Rings

Nitro Bar Rods

Seal life-nitrobar graph

The above figure illustrates the durability and enhanced performance of PolyMod® seals.  The results are from a pneumatic test at 100 psi internal pressure.  The rods were cycled with a 3” stroke at 1 Hz.  Rod temperatures were monitored during the test as was seal performance.  Seals were considered to have failed when internal pressure decreased to 95 psi.

The PolyMod® seals generated less frictional heat and were still functioning when the test was stopped!  During the test period, not only did the standard seals generate significantly more frictional heat, but several of them failed.  

The lower friction of the PolyMod® seals resulted in less heat generation which translated into longer life and improved energy efficiency.

PolyMod® High Performance vs. Standard NBR O-Rings

IHCP Superfinish Rods

Seal life IHCP graph


The above figure illustrates the excellent performance of PolyMod® seals against an IHCP (induction hardened chrome plated) rod with a superfine finish (0.075µm Ra).  The test conditions were identical to those listed for the previous figure.  Again, the lower heat generation of the PolyMod® seal was significant compared to the standard seal which failed early in the test program.  Even with superfine finishes, PolyMod® seals have longer performance life than standard seals.

 

PolyMod® High Performance Energizers vs. Standard NBR O-Rings

Magnaplate HMF Rods

Seal life PTFE caps magnaplate HMF graph

The above figure illustrates the advantage of using PolyMod® O-ring energizers for PTFE cap seals.  The test conditions were identical to those listed for the previous figures this time with the rod having a Magnaplate HNF finish.  The cap seal energized by a standard O-ring generated more frictional heat.  Wear also occurred at both the sealing surface and PTFE–energizer interface resulting in cap failure.  The cap energized by the PolyMod® O-ring was undamaged when the test was stopped and the PolyMod® O-ring exhibited no signs of wear.  The PolyMod® O-ring’s low friction and less abrasive nature prolonged the life of the PTFE cap seal.

 


No Adverse Material Property Changes

 

PolyMod® does not change physical properties. You get all the benefits of lower friction, improved wear, and enhanced performance without any changes to the engineered material properties.

 

AS568-214 NBR O-Rings - Original Physical Properties 

Physical Property Standard NBR Material

PolyMod® High Performance Material

Tensile Strength (psi) 2230 2158
Elongation (%) 290 287
100% Modulus 551 556
Hardness (Shore A) 71 71
TR10 (°F) -24 -27

 

AS568-214 NBR O-Rings - Physical Properties After Aging

70 hrs @ 302°F in ASTM #3 Oil

Physical Property Standard NBR Material

PolyMod® High Performance Material

Tensile Strength Change (%) -52 -37
Elongation Change (%) -38 -28
Hardness Change (pts.) 7 7
Volume Swell (%) 16 16

 

 

Versatility – Offering system designers latitude to optimize performance

 

The PolyMod® process can be performed on a variety of polymers, both thermoset and thermoplastic, with a wide range of physical properties. All Nitriles (NBR, XNBR, HNBR), Ethylene Propylene (EP, EPDM, EPR), Butyl (IIR), Ethylene Acrylate (AEM), Chloroprene/Neoprene (CR), Polyurethane (AU, EU), and Tetrafluoroethylene-Propylene (TFE/P), Santoprene®, Geolast®, and Krayton® can be PolyMod® processed – just to name a few materials.

PolyMod®  is not limited to seal geometry, seal type, or even to seals.  The PolyMod® process can be performed on O-rings to custom shapes and from seals to other rubber parts, such as wiper blades.  With such versatility, your options to optimize performance are almost unlimited.

 


 

The user is cautioned that PolyMod® Technologies Inc. can accept no liability for the accuracy and applicability of this information. All statements, technical information, and recommendations are based upon many years of experience, but in practice unknown parameters and conditions can limit the validity of general statements, therefore PolyMod® Technologies Inc. makes no representations or warranties either expressed or implied based on the contents herein. Users are encouraged to conduct testing. For assistance and evaluation of your specific applications, please contact PolyMod® Technologies Inc.'s Technical Service Team.

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PolyMod® Technologies Inc.

AS9100D & ISO 9001:2015
Registered QMS

P.O. Box 10180
Fort Wayne, IN 46851-0180 USA
Phone : +01 (260) 436-1322
Fax : +01 (260) 432-6051
Email : sales@polymod.com