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Acetal HomopolymerThermoplasticTrade Names• Celcon• Delrin• Iupital• Kemlex• Tenac• UltraformManufacturerHoechst CelaneseE.I. DuPontMitsubishi GasFerro CorporationAsahi ChemicalBASFGeneral DescriptionAcetal homopolymer is a highly crystalline thermoplastic produced bypolymerizing formaldehyde and capping each end of the polymer chainwith acetate groups. The polymer is properly called polyoxymethylene(POM) and has a backbone comprised of repeating -CH 2 O- units. Acetalcopolymer is manufactured by copolymerizing trioxane with relativelysmall amounts of a comonomer. The comonomer randomly distributescarbon-carbon bonds in the polymer chain which helps to stabilize theresin against environmental degradation. The relatively low cost ofacetals, in addition to their good balance of mechanical, chemical andelectrical properties, makes them well suited for replacing metal andother structural materials. Specialty grades available include glassfilled,low friction/low wear, antistatic and conductive, mineral-coupled,UV stabilized, pigmented, toughened (elastomer modified), and abrasionresistant grades. In 2004, the price of acetal homopolymer rangedapproximately from $1.25 to $2.00 per pound at truckload quantities.General PropertiesAcetals exhibit high physical strength, as well as excellent creep andimpact resistance. Due to their extremely low water absorption rate, theelectrical properties and dimensional stability of acetal resins areminimally affected by atmospheric moisture. The dielectric constant ofan acetal resin varies only slightly over a wide frequency range, itsdielectric strength is high, and a volume resistivity of 1015 ohm-cmmakes it a good electrical insulator. Acetals are resistant to solvents,ethers, oils, greases, gasoline, and other organic compounds, and areespecially well suited for use with methanol-based fuels. They areresistant to moderate strength acids, but are not recommended for usewith strong acids. Acetal homopolymer is very resistant to wear due toits hard surface and low coefficient of friction (0.1 to 0.3). Acetalhomopolymer is UL94HB rated for flammability, and has continuousservice temperatures in the range of 212°F (100°C) to 221°F (105°C).Typical Properties of Acetal HomopolymerAmerican EngineeringProcessing Temperature 350°F to 420°F 117°C to 216°CLinear Mold Shrinkage 0.001 to 0.025 in./in. 0.001 to 0.025 cm/cmMelting Point 325°F to 355°F 163°C to 179°CDensity 84.3 to 96.1 lb./ft. 3 1.35 to 1.54 g/cm 3Tensile Strength, Yield 6.0 to 10.0 lb./in. 2 x 10 3 4.2 to 7.0 kg/cm 2 x 10 2Tensile Strength, Break 5.8 to 10.0 lb./in. 2 x 10 3 4.2 to 7.0 kg/cm 2 x 10 2Elongation, Break 5.0 to 80.0% 5.0 to 80.0%Tensile Modulus 3.0 to 5.0 lb./in. 2 x 10 5 2.1 to 3.5 kg/cm 2 x 10 4Flexural Strength, Yield 7.1 to 15.6 lb./in. 2 x 10 3 5.0 to 11.0 kg/cm 2 x 10 2Flexural Modulus 2.2 to 5.7 lb./in. 2 x 10 5 1.5 to 4.0 kg/cm 2 x 10 4Compressive Strength 4.5 to 17.6 lb./in. 2 x 10 3 3.2 to 12.4 kg/cm 2 x 10 2Izod Notched, R.T. 0.5 to 2.8 ft.-lb./in. 2.7 to 15.1 kg cm/cmHardness R117 - R120 Rockwell R117 - R120 RockwellThermal Conductivity 1.6 to 2.5 BTU-in./hr.-ft. 2 -°F 0.23 to 0.31 W/m-°KLinear ThermalExpansionDeflection Temperature@ 264 psiDeflection Temperature@ 66 psiContinuousService Temperature0.5 to 11.0 in./in.-°F x 10 -5 0.9 to 19.8 cm/cm-°C x10 -5SI195°F to 325°F 91°C to 163°C300°F to 345°F 149°C to 174°C212°F to 221°F 100°C to 105°CDielectric Strength 380 to 500 V/10 -3 in. 1.5 to 2.0 V/mm x 10 4Dielectric Constant@ 1 MHzDissipation Factor@ 1 MHzWater Absorption,24 hr.3.5 to 4.2 3.5 to 4.20.001 to 0.009 0.001 to 0.0090.16 to 0.35% 0.16 to 0.35%Typical Applications• Automotive – Fasteners, carburetor floats, knobs,fuel pump housings• Industrial Machinery – Valves, conveying equipment,rollers, springs• Plumbing – Ballcocks, faucet cartridges, impellers, shower heads,faucet underbodies• Electronic – Keytops, switches, buttons• Miscellaneous – A/V cassette components, toiletry articles,zippers, bearings, toy parts14The Loctite ® Design Guide for Bonding Plastics, Volume 4
ADHESIVE SHEAR STRENGTH(psi)(MPa)Acetal HomopolymerUNFILLED RESIN30 rmsROUGHENED47 rmsANTIOXIDANT0.2% Irganox 1010UV STABILIZER0.2% Tinuvin 3280.4% Tinuvin 770IMPACT MODIFIER30% Estane 5708F1LUBRICANT3.88% N,N'-EthyleneBisstearamide WaxGLASS FILLER20% Type 3090Glass FillerPTFE FILLER15% PTFE MP1300COLORANT4% 3972 colorantDelrin 100 produced by Dupont PolymersANTISTATIC1.5% Markstat AL12ACETAL COPOLYMERCelcon courtesy ofHoechst CelaneseLoctite ® 380 Black Max ® Instant Adhesive,Rubber ToughenedLoctite ® 401 Prism ® Instant Adhesive,Surface InsensitiveMEDICAL: Loctite ® 4011 Prism ®Instant Adhesive, Surface InsensitiveLoctite ® 401 Prism ®Loctite ® 770 Prism ® PrimerMEDICAL: Loctite ® 4011 Prism ® /Loctite ® 7701 Prism ® PrimerLoctite ® 414 Super Bonder ®Instant Adhesive, General PurposeLoctite ® 330 Depend ® Adhesive,Two-Part No-Mix AcrylicLoctite ® 3105 Light Cure Adhesive,MEDICAL: Loctite ® 3311 Light Cure Adhesive1000.72001.4170011.75003.5500.32501.71501.06004.1170011.75003.51000.72501.71000.74002.8170011.75003.5500.32501.71000.79006.2170011.75003.5500.33002.11000.73502.4170011.75003.5500.33502.41000.73502.4170011.79006.2500.34503.11000.711007.6280019.311007.6500.33002.11000.72001.4170011.71000.7500.32501.71000.72001.4170011.75003.5500.32501.71501.0175021.1170011.711007.6500.32501.7500.31000.73002.11000.72001.42001.4Delrin 150E produced by Dupont Polymers 23 rmsLoctite ® 3340 Light Cure Adhesive,UV Cationic EpoxyLoctite ® 4305 Flashcure ® Light Cure AdhesiveFLUORESCENT: Loctite ® 4307 Flashcure ®Light Cure AdhesiveLoctite ® H3000 Speedbonder Structural Adhesive, General PurposeLoctite ® H4500 Speedbonder Structural Adhesive, Metal BonderLoctite ® 3030 Adhesive, Polyolefin BonderLoctite ® E-00CL Hysol ® Epoxy Adhesive,Low OdorLoctite ® E-90FL Hysol ® Epoxy Adhesive,FlexibleLoctite ® E-30CL Hysol ® Epoxy Adhesive,Glass BonderMEDICAL: Loctite ® M-31CL Hysol ®Epoxy Adhesive, Glass BonderLoctite ® E-20HP Hysol ® Epoxy Adhesive,Fast SettingMEDICAL: Loctite ® M-21HP Hysol ®Epoxy Adhesive, Fast SettingLoctite ® E-214HP Hysol ® Epoxy Adhesive,High StrengthLoctite ® Fixmaster ® High Performance EpoxyLoctite ® 1942 Hysol ® Hot Melt Adhesive,EVA BasedLoctite ® 3651 Hysol ® Hot Melt Adhesive,Polyolefin2001.42001.42001.41501.03502.42501.72001.43002.11501.010507.21501.02501.71000.7Adhesive PerformanceLoctite ® 401 Prism ® Instant Adhesive, when used in conjunction with Loctite ® 770 Prism ® Primerachieved the highest bond strengths on all of the acetal formulations that were evaluated. Loctite ®E-214HP Hysol ® Epoxy Adhesive, Loctite ® 3631 Hysol ® Hot Melt Adhesive, Loctite ® U-05FL Hysol ®Urethane Adhesive, Loctite ® 414 Super Bonder ® Instant Adhesive and Loctite ® 3030 Adhesive achievedthe second highest bond strengths. Loctite ® 330 Depend ® Adhesive and Loctite ® 5900 ® Flange Sealantachieved the lowest bond strengths on acetal polymers. The addition of an antistatic additive to acetalhomopolymer resulted in a large, statistically significant increase in the bond strengths achieved whenusing Loctite ® 401 Prism ® , 4011 Prism ® or 414 Super Bonder ® Instant Adhesives.Surface TreatmentsSurface roughening either caused no effect or a statistically significant increase in bond strengthachieved on acetal homopolymer. The use of Loctite ® 770 Prism ® Primer, in conjunction with Loctite ®401 Prism ® Instant Adhesive, or Loctite ® 4011 Prism ® Medical Device Instant Adhesive with Loctite ®7701 Prism ® Primer, caused a statistically significant increase in the bondability of both acetalhomopolymer and copolymer.Other Important Information• The surface of acetals tends to be very dry, so an accelerator may be necessaryto speed the cure of cyanoacrylates.• Acetal homopolymers are compatible with all Loctite ® brand adhesives,sealants, primers, and activators.• Surface cleaners: isopropyl alcohol, Loctite ® ODC-Free Cleaner & Degreaser.Loctite ® 7804 Hysol ® Hot Melt Adhesive1501.0Loctite ® 3631 Hysol ® Hot Melt Adhesive,UrethaneLoctite ® U-05FL Hysol ® Urethane Adhesive,High StrengthLoctite ® Fixmaster ® Rapid Rubber RepairOEM: Loctite ® U-04FL Hysol ®Urethane Adhesive, Fast Setting7004.86004.12501.7NOTES:The addition of the indicated additive(or surface roughening) caused a statisticallysignificant decrease in the bond strength within95% confidence limits.NOTES:The addition of the indicated additive(or surface roughening) caused a statisticallysignificant increase in the bond strength within95% confidence limits.Loctite ® 5900 ® Flange Sealant,Heavy Body RTV Silicone500.3The Loctite ® Design Guide for Bonding Plastics, Volume 4 15
Page 5 and 6: How To Use The Plastic Bonding Guid
Page 8: Cyanoacrylate AdhesivesGeneral Desc
Page 11 and 12: Light Curing Acrylic AdhesivesGener
Page 13 and 14: Silicone AdhesivesGeneral Descripti
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Surface TreatmentsAdhesive Abrading
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Adhesive Joint DesignIntroductionIn
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TitleDesign GuidelinesEngineers mus
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Shortening bond overlaps reduces bo
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Softening and weakening of the surf
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Determining The Test MethodThe lap
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Block Shear Test Method1. Assemblie
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ViscosityViscosity is a product pro
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Index of Trade NamesTrade Name Plas
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Trade Name Plastic Type Manufacture
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AcknowledgmentsThis manual would no
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For more information, please call 1
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