The most important component of the sealing element is the lip material. You must consider the environmental conditions and the function of the seal as follows: resistance to media being sealed, good resistance to the operational temperatures, good resistance to water, low compression set, material tensile strength (appropriate material duro-value), and overall material cost.
In order to satisfy most sealing applications, Truseals has the materials available to get the job done.
FDA applications?… Please call!
BASE MATERIAL |
NITRILE(Buna-N, NBR) |
POLYACRYLATE(PA) |
SILICONE(SIL) |
** VITON*(FPM, FKM) |
| Temperature Range | -40*F to 250*F-30*C to 120*C | -20*F to 300*F-30*C to 150*C | -80*F to 400*F-60*C to 200*C | -30*F to 400*F-35*C to 200*C |
| Oil Resistance | Excellent | Excellent | Good | Excellent |
| Acid Resistance | Good | Fair | Fair | Excellent |
| Alkali Resistance | Good | Not Recommended | Not Recommended | Fair |
| Water Resistance | Good | Fair | Fair | Good |
| Heat Resistance | Good | Excellent | Excellent | Excellent |
| Cold Resistance | Good | Fair | Fair | Fair |
| Wear Resistance | Excellent | Excellent | Excellent | Excellent |
| Ozone Resistance | Good | Excellent | Excellent | Excellent |
** Viton* is a registered trademark of the DuPont Corporation.
MATERIAL |
ADVANTAGES |
DISADVANTAGES |
|
Nitrile (Buna-N, NBR) |
Is a co-polymer of Butadiene and Acryonirile. Good resistance, cold flow, tear resistance. Commonly referred to as Buna-N or NBR. | Poor resistance to ozone and weather aging. Poor cold temperature limit, dry running ability, water resistance. Lower mechanical strength. Fair resistance to water, dry running. Low temperature resistance is fair. |
|
Polyacrylate (PA) |
Polymerized acrylic acid-esters or PA and ACM. Good resistance to mineral oils, hypoid gear oils E.P. additives, greases, aging and flex cracking. | Low resistance to hydrocarbon fluids like gasoline or paraffin fluids. |
|
Silicone (SIL) |
Broad temperature range. Good ozone resistance. Resistant to compression set. | |
|
Fluoroelastomer (FPM, FKM) |
Good temperature resistance. Commonly chosen as high temperature replacement for Nitrile or Polyacrylate. |
Truseals offers a wide range of specialty materials and hybrids. Please call with your operational requirements.
