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Direct-formed parts have lower performance characteristics than parts that have been machined from compression-molded or isostatic shapes. Isostatic shapes have isotropic physical properties, whereas direct formed and compression molded shapes exhibit anisotropic physical properties.
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resistance, as well as a UL rating for minimal electrical and thermal conductivity. This is the unfilled base polyimide resin. It also provides high physical strength and maximal elongation, and the best electrical and thermal insulation values. Example: Vespel
240:
Vespel can be processed by direct forming (DF) and isostatic molding (basic shapes – plates, rods and tubes). For prototype quantities, basic shapes are typically used for cost efficiency since tooling is quite expensive for DF parts. For large scale
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added to the base resin for the lowest coefficient of friction over a wide range of operating conditions. It also has excellent wear resistance up to 149 °C (300 °F). Typical applications include sliding or linear
666:
131:, and transportation technology. It combines heat resistance, lubricity, dimensional stability, chemical resistance, and creep resistance, and can be used in hostile and extreme environmental conditions.
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for wear and friction resistance in vacuum and other moisture-free environments where graphite actually becomes abrasive. Typical applications include seals, plain bearings,
807:
A. Carlsson, G. Starck, M. Ljungberg, S. Ekholm and E. Forssell-Aronsson (2006). "Accurate and sensitive measurements of magnetic susceptibility using echo planar imaging".
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rings, slide blocks and other wear applications. This compound has the best mechanical properties of the graphite-filled grades, but lower than the virgin grade. Example:
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Although there are polymers surpassing polyimide in each of these properties, the combination of them is the main advantage of Vespel.
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temperatures. However, Vespel tends to absorb a small amount of water, resulting in longer pump time while placed in a vacuum.
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For different applications, special formulations are blended/compounded. Shapes are produced by three standard processes:
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for enhanced wear resistance, lower friction, improved dimensional stability (low coefficient of
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228:. Matching volume magnetic susceptibilities of materials surrounding NMR sample to that of the
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729:"Comparison of PEEK and VESPEL®SP1 characteristics as vacuum seals for fusion applications"
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without altering its thermal and mechanical properties. Extensive tables of measured
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provides operating temperatures from cryogenic to 300 °C (570 °F), high
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even at high temperatures, which makes it useful for lightweight heat shields and
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http://www2.dupont.com/Vespel/en_US/assets/downloads/vespel_s/Vespel_SP-22_DF.pdf
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production, DF parts are often used to reduce per part costs, at the expense of
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35:. Knowledge is not a collection of links and should not be used for advertising.
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properties which are inferior to those of isostatically produced basic shapes.
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224:(−9.03×10 at 20 °C ) Negative values indicate that both substances are
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Material properties of Vespel (produced by isostatic molding and machining)
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664:, Shelton, Charles F., "Insulated conductor", issued 1969-02-04
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682:"Temperature behaviour of permeation of helium through Vespel and Torlon"
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216:(−9.02 ± 0.25×10 for Vespel SP-1 at 21.8 °C) is close to that of
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637:"Polyimide | Vespel - SPN expert en plastiques hautes performances"
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Schmidtchen, U.; Gradt, T.; Börner, H.; Behrend, E. (1994-02-01).
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added to the base resin for increased wear resistance and reduced
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can reduce susceptibility broadening of magnetic resonance lines.
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direct forming (for small size parts produced in large volumes).
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as well as many wear and friction uses listed above. Example:
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15% moly-filled (molybdenum disulfide solid lubricant), SP-3
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180:. For example, it can withstand repeated heating up to 300
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Summary of typical properties standard SP polyimide resins
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is the trademark of a range of durable high-performance
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Unlike most plastics, it does not produce significant
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275:Some examples of standard polyimide compounds are:
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727:Murari, A.; Vinante, C.; Monari, M. (2002-04-19).
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208:Vespel is used in high-resolution probes for
841:: CS1 maint: multiple names: authors list (
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332:10% PTFE and 15% graphite by weight, SP-211
261:compression molding (for plates and rings);
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766:P. T. Keyser & S. R. Jefferts (1989).
96:Sawn and turned workpiece made from Vespel
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236:Processing for manufacturing applications
69:Learn how and when to remove this message
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1515:NASCAR Cup Series career of Jeff Gordon
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29:This article contains references that
1447:Winterthur Museum, Garden and Library
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146:applications, down to extremely low
43:adding citations to reliable sources
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142:support. It also performs well in
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1522:The DuPont Show with June Allyson
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264:isostatic molding (for rods); and
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119:Characteristics and applications
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1511:Hendrick Motorsports Car No. 24
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214:volume magnetic susceptibility
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745:10.1016/S0042-207X(01)00420-1
735:. IUVSTA Highlights Seminar.
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314:40% graphite by weight, SP-22
292:15% graphite by weight, SP-21
161:Vespel is commonly used as a
706:10.1016/0011-2275(94)90032-9
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1181:Anthony Joseph Arduengo III
1110:DuPont Experimental Station
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1468:DuPont v. Kolon Industries
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178:thermophysical properties
157:Thermophysical properties
123:Vespel is mostly used in
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1131:Éleuthère Irénée du Pont
363:Material properties data
299:in applications such as
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47:Knowledge:External links
1417:Hercules Powder Company
1105:DuPont Central Research
200:, have been published.
196:, all as functions of
176:and consistency of its
1176:Jeffery Stanford Agate
1151:Francis Irénée du Pont
1146:Francis Gurney du Pont
190:specific heat capacity
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85:Structure of a Vespel
1296:William Dale Phillips
280:SP-1 virgin polyimide
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1361:Edgar S. Woolard Jr.
857:"Tamshell Materials"
809:Magn. Reson. Imaging
503:Thermal conductivity
163:thermal conductivity
39:improve this article
1437:Savannah River Site
1291:Charles J. Pedersen
1261:Edward G. Jefferson
1251:Charles O. Holliday
1087:Antec International
951:Alexander M. Cutler
784:1989RScI...60.2711K
698:1994Cryo...34..105S
562:Dielectric constant
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204:Magnetic properties
186:thermal diffusivity
1382:DuPont (1802–2017)
1366:Nathaniel C. Wyeth
1346:Chadwick A. Tolman
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1221:Thomas M. Connelly
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170:thermal insulators
166:reference material
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1211:Wallace Carothers
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1236:Linda Fisher
1216:Uma Chowdhry
1074:Subsidiaries
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862:22 September
860:. Retrieved
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837:cite journal
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327:Vespel SP-22
309:Vespel SP-21
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212:because its
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168:for testing
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59:October 2019
56:
53:for details.
37:Please help
30:
1506:Pioneer 250
1501:Tour DuPont
1494:Sponsorship
1351:Earl Tupper
1276:James Lynah
1246:Jeff Gordon
643:(in French)
534:resistivity
455:coefficient
401:(10% PTFE,
386:(unfilled)
356:Vespel SP-3
325:. Example:
226:diamagnetic
198:temperature
1573:Categories
1098:facilities
686:Cryogenics
662:US3425865A
647:2022-02-17
622:References
381:condition
136:outgassing
1397:B Reactor
938:directors
935:Selected
753:0042-207X
714:0011-2275
483:296–573 K
465:211–296 K
373:Property
323:oxidation
148:cryogenic
125:aerospace
105:polyimide
1579:Plastics
1548:Category
1485:Chemours
1021:Neoprene
974:Products
879:. DuPont
829:17071340
544:at 296 K
512:at 313 K
338:bearings
297:friction
247:material
140:crucible
111:made by
109:plastics
1558:Commons
1375:History
996:Hypalon
780:Bibcode
694:Bibcode
635:admin.
532:Volume
399:SP-211
230:solvent
194:density
107:-based
87:polymer
1452:Conoco
1060:Zodiaq
1051:Vespel
1041:Teflon
1036:Sorona
1011:Kevlar
1006:Kapton
1001:Kalrez
981:Corian
928:DuPont
827:
751:
733:Vacuum
712:
668:
394:SP-22
389:SP-21
376:Units
286:plasma
144:vacuum
113:DuPont
101:Vespel
45:. See
1064:Zytel
1056:Viton
1046:Tyvek
1031:Nylon
1026:Nomex
1016:Mylar
991:Freon
986:FE-13
609:13.41
592:13.28
575:13.53
550:10–10
547:10–10
527:0.47
447:1.60
408:(15%
406:SP-3
384:SP-1
379:Test
352:gears
289:SP-1.
253:Types
218:water
1076:and
864:2017
843:link
825:PMID
749:ISSN
710:ISSN
606:3.55
589:3.64
572:3.62
524:0.76
521:1.73
518:0.87
515:0.35
444:1.55
441:1.65
438:1.51
435:1.43
305:seal
49:and
817:doi
788:doi
741:doi
702:doi
509:/mK
498:52
474:27
459:10/
410:MoS
243:CNC
220:at
41:by
1575::
839:}}
835:{{
823:.
813:24
811:.
786:.
776:60
774:.
770:.
747:.
737:65
731:.
708:.
700:.
690:34
688:.
684:.
639:.
541:·m
495:54
492:38
489:49
486:54
471:34
468:45
420:)
188:,
182:°C
127:,
115:.
1517:)
1513:(
1403:)
1399:(
920:e
913:t
906:v
866:.
845:)
831:.
819::
796:.
790::
782::
755:.
743::
716:.
704::
696::
650:.
539:Ω
507:W
461:K
415:2
358:.
344:.
329:.
311:.
72:)
66:(
61:)
57:(
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