Delrin® Product & Properties Guide

1 Product and Properties GuideStartwithDuPontDelrin acetal resinDelrin P performanceacetal resinDelrin ELEVEN Series acetal resinDuPont Engineering PolymerseCopyright 2000 du Pont de Nemours and Company. All rights of ContentsPageGeneral Description .. 1 Properties and Characteristics ..1 Compositions .. 2 Colors .. 3 Processing .. 3 Applications .. 4 Automotive .. 4 Industrial Equipment .. 4 Consumer Goods and Appliances .. 5 Electrical and Office Automation .. 6 Table 1 General Purpose and Specialty Grades of Delrin .. 7 Proven Performance in Actual Use .. 10 Product Form and Packaging .. 10 Table 2 General Purpose Grades of Delrin ASTM Data .. 11 Table 3 Specialty Grades of Delrin ASTM Data .. 14 Table 4 General Purpose Grades of Delrin ISO Data .. 20 Table 5 Specialty Grades of Delrin ISO Data .. 21 General DescriptionDelrin , the world s first acetal resin, is a highlyversatile engineering polymer. It offers an excellentbalance of desirable Properties that bridges the gapbetween metals and ordinary plastics.

2 Since itsintroduction in 1960, it has been widely usedaround the world in many applications, such as inthe automotive, appliance, construction, hardware,electronic, and consumer goods industries. Delrin has gained widespread recognition for its reliabilityand performance in thousands of engineeringcomponents. Delrin is the DuPont registeredtrademark for its brand of acetal resin also com-monly referred to as polyoxymethylene (POM).Figure 1. Windowlift motors installed in Ford Taurusand Mercury Sable automobiles use gearsmade of Delrin 100. Courtesy of UTAM otor and CharacteristicsThe chemical composition, regular molecular-structure and high degree of crystallinity result in aunique combination of outstanding characteristicsof Delrin acetal resins not found in metals or mostother plastics: High mechanical strength and rigidity Toughness and high resistance to repeatedimpacts Long-term fatigue endurance Excellent resistance to moisture, gasoline,solvents, and many other neutral chemicals Excellent dimensional stability Good resilience and resistance to creep Natural lubricity Wide end-use temperature range Good electrical insulating characteristicsFigure 2.

3 This valve actuatorcam link for residen-tial natural gaspressure regulatorwas molded ofDelrin for its long-term creep resis-tance and immunity to chemical of Fisher Control International, purpose grades of Delrin are available inseveral basic melt flow series: 100, 500, 900, and1700. These differ primarily in melt viscosity with100 being the most viscous and 1700 the mostfluid. The most appropriate grade for a givenapplication will depend largely upon fill require-ments and end-use original Classic grades introduced by DuPontin 1960 continue to be an important part of theDelrin Product line. Delrin 100, 500 and 900 areknown around the world for their outstandingmechanical 1992, DuPont introduced a major upgrade to theDelrin Product line known as the P revolutionary new formulations providesignificant benefits to the molding community,while retaining the superior physical characteristicsthat Delrin has always been noted benefits include excellent thermal stability,wider processing windows, low mold and screwdeposit, minimal mold corrosion, and outstandingregrind stability.

4 The P products are offeredthroughout the range of melt viscosities: Delrin 100P, 500P, 900P and newest major addition to the Delrin productfamily is the ELEVEN Series, introduced in1996. The new Delrin ELEVEN Series essen-tially combines the outstanding mechanical proper-ties of the classic grades with the excellent thermalstability of the Delrin P grades. In addition, theDelrin ELEVEN Series is modified to provideenhanced crystallization: faster cycle times, lowermold shrinkage, less warpage, reduced voids, andgreater mold dimensional stability. The morecrystalline nature results in even greater stiffnessFigure 3. Excellent surface appearance and superiorimpact behavior were benefits gained frommolding this safety belt housing from aUV-stabilized grade of Delrin . Courtesy ofKKF Karl Fells GmbH & strength, as well as more stability and lesspermeation in prolonged immersion in manychemicals, including water, fuels, and oils. The ELEVEN Series is also offered in a range of meltviscosities: Delrin 111P, 511P and wide range of specialty grades of Delrin acetalresin are available to meet specific customer needsfor demanding applications: Toughened and super tough resins UV-stabilized grades Low friction and low wear grades Glass-filled and glass-reinforced grades Extrusion resinsA complete listing of general purpose Delrin andDelrin specialty products can be found in Table 4.

5 Cost reduction due to one-piece molding,lower weight, no rush and design versatil-ity are some advantages for molding thesedoor lock housings of Delrin 100. Courtesyof number of standard colors are available at aminimum order quantity of 25 kg ( lb). Fullycompounded custom colors are available for mostof the Delrin products at a minimum order quan-tity of 1000 kg (2,200 lb). All standard and customcolors of Delrin acetal resin are free of with masterbatch coloring, fully com-pounded resin colors give the best possible overalloffering due to careful pigment metering and uniform pigment dispersionduring the production process guarantee consistentcolor quality and optimal physical Properties ofthe molded part, thus avoiding color variations andpart failures which may occur with the use a consequence of their enhanced stability,Delrin P and the Delrin ELEVEN Series havebetter colorability and allow for the use of a widerrange of pigments.

6 Colored resins may showslightly different Properties compared with naturalresins, especially for crystallinity and shrinkage. Insome cases, such effects can be minimized byappropriate pigment most commonly used method for processingDelrin is injection molding. The surface finish ofcorrectly molded parts of Delrin replicate thesurface finish and shape of the mold. Standardextrusion equipment can be used to extrude theresin into rods, slabs, sheeting, and small diametertubing. Parts or stock shapes can be machined the Delrin Molding Guide for detailedrecommendations on optimum 5. Gears for hand mixers and bread slicermotors molded of Delrin 100 for reliabilityunder harsh conditions and heavy of Elektroger te Suhl 6. Sound system speaker grilles for a JeepCherokee made of Delrin of Chrysler Fuel system components (gas caps, floats, pumphousings, senders) Heavy load-bearing gears (window lifts, wind-shield wipers) Fasteners Window/door hardware Safety system components (buckles, seatbelthardware, spools, guidetracks, clock springs) Loudspeaker grilles Control switches Interior trim Steering components Pillar loopsFigure 7.

7 The shoe base andpushing cap in thesediverter shoes used inhigh speed package sorting are moldedfrom Delrin 500. Courtesy of RapistanDemag Equipment Wear surfaces: bushings, bearings, cams, pulleys Gas meters Gears: spur, cluster, helical, bevel, worm Conveyors: flat top conveyor chain, wear strips,conveyor links Pump impellers: submersible, gear, centrifugal,proportioning, reinforced diaphragms, jet well Fan and blowerblades Pumps andbeverage valves Farm machinery Irrigation sprinklercomponents Shower heads Hose couplings Water metercomponentsFigure 8. The spray system in this garden sprinklerwas molded of Delrin acetal resin forsuperior wear, UV stability, and the bestproperties for snap-fitting the sprinklerhead. Courtesy of 10. Six parts injection molded from Delrin play key roles in water-saving spa 2001 Shower heads with adjustable spray andmassaging action. Courtesy of EnergyTechnology Goods and Appliances Lighter bodies Pen components Zippers Clips, fasteners, buckles Window and drapery hardware Chair coasters, rollers Appliance components (gears, knobs) Garden chemical sprayers Household water softeners Soap dispensers Paint mixing paddles, canisters Scrubbing discs on power rug cleaners Hot air: heater blowers, clothes dryers, automo-tive light sockets, 35 mm slide projector parts Garage door opener components Ski bindings and straps Knife handles Gears (toys) Roller-skate brake supports Salt water: marine fittings, fishing reels Faucet aerators Lawn sprinklers Garden hose nozzles Ballcocks Toilet flush valves Faucet valve cartridgesFigure 9.

8 This tool changer carousel is comprised of22 identical components made from Delrin 100 acetal resin for the best balance ofstiffness and strength coupled with flexfatigue resistance needed for the springfingers of the tool gripper. Courtesy ofBridgeport Machines and Office Automation Gears: spur, cluster, helical, bevel, worm Laser printer gear trains Video tape drives Switches Coil forms Telephone terminal strips Relay components, buttons, and knobs Audio and video tape cartridge platforms andwear parts Electromechanical counter framesFigure 13. Gear trainsused inLexmark sOptra LaserPrinters have11 gearsmolded fromDelrin 500 Pand Delrin 14. These components for pressure regulatorsin solenoid valves and electromagneticdevices were molded of Delrin acetalresin. Courtesy of Honeywell Lucifer 11. This ceiling-mounted garage door openeruses a worm gear molded from Delrin 100, which provides the mechanicalstrength and excellent compatibility forlow friction and wear.

9 Courtesy of theChamberlain 12. This touring binding utilizes a UV-stabilized grade of Delrin and Delrin 500AF for the impact resistance at lowtemperature, Good UV stability and long-life cycle. Courtesy of Fritschi (continued)Table 1 General Purpose and Specialty Grades of Delrin Delrin GradeProcessCharacteristicsTypical ApplicationsCOMPOSITIONS OF GENERAL PURPOSE GRADES100 Injection molding,High-viscosity resin, best combinationHigh performance engineeringextrusionof stiffness and toughness, very goodparts, , gears, seatbeltcreep resistancerestraint systems, fasteners,conveyors100 PInjection molding,Same as Delrin 100, best moldingSame as Delrin 100extrusionthermal stability for deposit-free moldingin demanding processing conditions111 PInjection molding,Same as Delrin 100P, but modified forSame as Delrin 100, plus fuelextrusionenhanced crystallization and moresystem componentsprecise molding500 Injection moldingMedium viscosity resin. OptimumGeneral mechanical parts,combination of flow and physicalautomotive fuel systems, snap-propertiesfits, fasteners, gears500 PInjection moldingSame as Delrin 500, best moldingSame as Delrin 500thermal stability for deposit-free moldingin demanding processing conditions511 PInjection moldingSame as Delrin 500P, but modifiedSame as Delrin 500, plus fuelfor enhanced crystallization, andsystem componentsmore precise molding900 Injection moldingLow-viscosity resinMulticavity molds and parts withthin sections difficult to fill900 PInjection moldingLow-viscosity, fast molding, bestSame as Delrin 900molding thermal stability for deposit-freemolding in demanding processingconditions911 PInjection moldingSame as Delrin 900P, but modifiedSame as Delrin 900, plus fuelfor enhanced crystallization and moresystem componentsprecise molding1700 PInjection moldingVery low viscosity, fast molding resin,Parts with complex shapes.

10 Thinbest molding thermal stability for deposit-walls, long flow paths, orfree molding in demanding situationsmulticavity OF SPECIALTY GRADESTOUGHENED GRADES100 STInjection molding,Super tough, high-viscosity resin,Fasteners, lock systemsextrusionoutstanding resistance against repetitiveimpact, even at very low temperature500 MTInjection moldingModerately toughened resin, with higherFasteners, gearslevel of toughener than Delrin 500T;improved thermal stability in processing500 TInjection moldingToughened medium viscosity resin,Fasteners, gearsoptimizing flow Properties and impactperformance7(continued)(continued) Table 1 General Purpose and Specialty Grades of Delrin Delrin GradeProcessCharacteristicsTypical ApplicationsLOW FRICTION AND WEAR GRADES500 ALInjection moldingAdvanced lubricant system, very goodGears, drive trains, slidinglow-friction and low-wear propertiesdevices500 CLInjection moldingChemically lubricated Delrin 500,Gears, drive trains, slidingvery good low-friction and low-weardevicesproperties100 AFInjection molding,Delrin 100 with 20% Teflon PTFE* fibers,Specialty friction and wearextrusionoutstanding friction and wear propertiesapplications, conveyor systems500 AFInjection moldingDelrin 500 with 20% Teflon PTFE fibers,Specialty friction and wearoutstanding friction and wear propertiesapplications, conveyor systems520 MPInjection moldingDelrin 500P with 20% Teflon PTFES pecialty friction and wearmicropowder.