Bellow
The PSS Bellows offer the best combination of durability, strength & elasticity, and in addition to carrying standard sizing, can be engineered in a number of configurations to meet various application requirements. The most common configuration is composed of two ends (connectors) and a convolution region where the ends provide the assembly interface and the convolution (bellows) region provides for the design application travel / required flexibility. The application dictates the material requirement with standard options available in Nitrile or Silicone.
Nitrile Bellow
Nitrile rubber's single most important property is its exceptional resistance to oils and non-polar solvents. It also offers good gas impermeability, abrasion resistance and better thermal stability than most general purpose elastomers.
Chemical Composition (wt%)
| Hardness Shore A | Tensile (MPa) | Tensile (psi) | Elongation |
|---|---|---|---|
| 60 - 90 | 13.8 - 14.5 | 1,455 - 2,100 | 150% - 400% |
Mechanical Properties Spec.
| Typical applications: | Oil resistant seals that may be exposed to daylight or other forms of radiation. |
| Advatanges: | Good resistance to oils. Improved ozone resistance. |
| Upper continous service temp: | 100°C |
| Min. temp. for sealing applications: | -20°C |
| Min. non-brittle temp.: | -30°C |
Silicone Bellow
The silicone bellow material meets and exceeds the properties listed in SAE J20 Class A and provides superior low and high temperature resistance. The bellow is reinforced with multiple plies of aramid fabric and the Fluorosilicone Cover creates an oil and fuel resistant barrier protecting the exterior surface from the possibility of damage from splash or spill.
Original Properties
| Temp. Range: | -55°C - 175°C |
| Durometer, points Shore A: | 55 - 75 |
| Tensile, min, MPa: | 5.5 |
| Elongation, min, %: | 200 |
Oven Aging Conditions
| Change Limits: | 70 hours / 175°C |
| Durometer, points Shore A: | +10 |
| Tensile, max %: | -15 |
| Elongation, max, %: | -40 |
Oil Immersion Change Limits
| Change Limits: | 70 hours / 100°C |
| Volume, max %: | 0 - +45 |
| Tensile, max %: | -40 |
Coolant Immersion Change Limits
| Hours at Boiling Point: | 70 hours |
| Volume, %: | 0 - +40 |
| Durometer, points Shore A: | -10 - +10 |
| Tensile, max, %: | -30 |
| Elongation, max, %: | -25 |
Compression Set °C
| 70 hours, max, %: | 40 |
| Cold Flexibility (°C): | -40 |
Polyestor / Aramid Fiber
| Width: | 91.4 cm |
| Thickness: | 0.48 mm |
| Tensile Warp Wise: | 648 N |
| Tensile Weft Wise: | 610 N |
| Elongation Warp Wise: | 15.7% |
| Elongation Weft Wise: | 17.4% |