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DuPont™ Vespel® SP-3 is a molybdenum disulfide filled grade of DuPont™ Vespel® that provides outstanding friction and wear performance in vacuum and other moisture-free environments where graphite additives can become abrasive.DuPont™ Vespel® SP-3 is available as isostatically molded billets and unidirectionally pressed slabs specified as Type III/M and Type III/P respectively per ASTM 6456-10 and MIL-R-46198. Vespel® SP-3 is specified as Class 5 per AMS 3644G.Vespel® SP-3 is 15% moly-filled (molybdenum disulfide solid lubricant) for wear and friction resistance in vacuum and other moisture-free environments where graphite actually becomes abrasive. Typical applications of Vespel SP-3 include seals, bushings, bearings, gears, and other wear surfaces in outer space, ultra-high vacuum or dry gas applications.
Vespel® SP-3 Specifications:
ASTM-D 6456-99 Ty 3
AMS 3644 Class 5
Mil-R-46198 Type 3
DuPont™ Vespel® SP-3 for Spacecraft Applications
DuPont™ Vespel® SP-3 has been widely used for spacecraft applications since the early days of space exploration. Vespel® SP-3 is often specified for bearings, bushings, rollers, and slide pads that require superior friction and wear performance in vacuum conditions. The advantages of DuPont™Vespel® for spacecraft applications include:
Excellent friction and wear characteristics in vacuum
Maintains ductility and moderate modulus throughout a broad temperature range - from cryogenic to elevated temperatures
Excellent flammability characteristics
Good dimensional stability - low and consistent thermal expansion coefficient throughout a wide operating temperature range
Low outgassing
Key Properties
Excels in Vacuum & Dry Environments
Limitations
Chemical Resistance to Some Strong Acids and Bases
Hydrolyzes in Presence of Steam
Applications
Bushings & Bearings in Vacuum or Dry Environments
Seals in Vacuum or Dry Environments
DUPONT™ VESPEL® SP-3 IS WIDELY USED FOR:
Bushings
Bearings
Piston rings
Seals
Gears
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