Acetal resin is a highly versatile engineering plastic with metal-like properties, it offers an excellent balance of desirable properties that bridge the gap between metals and ordinary plastics. POM C black machining is capable of CNC machining, CNC milling, CNC turning, and fabrication services. Since its introduction in 1960, acetal polymer has been widely used around the world in many application, such as in the automotive, appliance, hardware, electronic and consumer goods industries. POM C has gained widespread recognition for its reliability and performance in thousands of engineering components

1. AcetalCopolymer –POM C) Acetalresinisahighlyversatileengineeringplasticwithmetal-likeproperties,itoffersanexcellentbalanceofdesirablepropertiesthatbridgethegapbetweenmetalsandordinaryplastics.POMCblackmachiningiscapableofCNCmachining,CNCmilling,CNCturning,andfabricationservices.Sinceitsintroductionin1960,acetalpolymerhasbeenwidelyusedaroundtheworldinmanyapplication,suchasintheautomotive,appliance,hardware, electronicandconsumergoodsindustries.POMChasgainedwidespreadrecognitionforitsreliabilityandperformanceinthousandsofengineeringcomponents.

2. Properties and CharacteristicsPOM-C black acetalis known for its
•High strength and stiffness (MOE 2600 MPa) compare to PA 6.0 (MOE 1600 MPa)
•Ease of machining (no microporosity)
•Dimensional stability (low moisture absorption 0,2%).
•Low coefficient of friction (0,35) compare to PA 6.0 (0,45).
•Low moisture absorption (0,2%) compare to PA 6.0 (9,5%)
•Low wear/ inherent self-lubricity
•Good electrical insulating characteristics because moisture has minimal effect of POM-C electrical properties (volume resistivity ≥ 1013 Ωxcm) compare to PA 6.0 (because of high water absorption volume resistivity ≥ 1010Ωxcm)
•Excellent resistance to gasoline, solvent, and many other neutral chemicals
•Better resistance to hot water and strong caustic high pH (basic) solution range of 5-9
•POM C black is best suited for close tolerance mechanical parts.
•The added ethylene linkages of acetalcopolymer increase the thermal stability, elongation,toughnessand better impact properties

3. Chemical
Chemical sprayer
Carburetor venturi
Hose connectors
Pumps and valve bodies
Irrigation sprinkler components
Mechanical
Wear surface : many types of bushings, bearings, cams
Gears : spur, helical, bevel, worm
Conveyors : flat top conveyor chain, conveyor links
Pump impellers : submersible, gear, centrifugal
Pistons
Fan and blower blades
Handles and knobs
Pulley, casters, rollers
Electrical
Automotive switches and connectors
Relay components
Electrical switch components, buttons, and knobs
Environmental conditions
Salt water : marine fittings, fishing reels
Fuels : gas caps, fuel senders/modules, filters
Hot air : heater blowers, shower heads
Typical Areas of Application

4. Chemical resistance characteristics
pompiston in steam air engineOneoftheoutstandingpropertiesofPOM-Cisexcellentresistancetoavarietyoforganiccompounds.Acetalresinhavegoodloadcarryingabilityinmanyneutralorganicandinorganicmaterials,evenatelevatedtemperatures.Acetalresinexhibitsgooddimensionalstabilityandchemicalresistancetothefollowing:
•Alcohols
•Aldehydes
•Esters
•Ethers
•Hydrocarbons (gasoline, lubricants, hydraulic fluids)
•Agricultural chemicals
•Many weak acids and weak basesTheloadcarryingabilityofPOM-Coranyplasticmaterial,willdependonthefollowingfactors:
•Natureandconcentrationofthechemical
•Temperature
•Stresslevel
•Timeofchemicalexposureatgivenstresslevel
EffectofSpecificChemicals
UnstressedspecimenofPOM-Cwereexposetoavarietyofchemicalsforperiodeuptooneyearandtemperatureupto93C
Solvents
POM-Cisexceptionallyresistanttosolventsretainingover90% ofitstensilestressafterexposuretoalmostallsolvents.
LubricantsandHydraulicFluids.POM-Cgenerallyhasgoodresistancetobaseoils.Thepresenceofchemicaladditivesinsomeoilsmayhaveamarkedeffectonperformance, particularlyattemperaturesabove66°C.
Gasolines
Tensilestrengthofacetalresinisessentiallyunaffectedbyexposuretogasoline.Stiffnesscanbereducedamoderateamount,dependingupontheconcentrationofaromatichydrocarbonsinthefuel.Thisslightplasticizingeffectiscompletelyrecoverableifexposureisterminatedandthehydrocarbonsallowedtoevaporate
AgriculturalChemicals
POM-Chasexcellentresistancetoagriculturalchemicalssuchascommercialtypesofinsecticides,fungicides,andfertilizers.
Acids,Bases,andOxidizingAgents
POM-Chasgoodresistancetomanyweakacidsandweakbases. Itisnotsuitableforserviceinstrongacids,strongbases,oroxidizingagents.Thus,theyarenotrecommendedforusesoutsideofpHrange4-9.Furthermoreothercomponentsinwatermayreactwithacidsandbasesandaffecttheresistancecharacteristics.

5. Chemical resistance POM-C
POM-CGOOD CHEMICAL RESISTANCE e.g. toFUEL, SOLVENTS and STRONG ALKALIS

6. POM-C VS POLYAMIDE (Nylon) in dimensional stability
Becauseacetalabsorbsminimalamountsofmoisture(0,05%),itsphysicalpropertiesremainconstantinavarietyofenvironments.Lowmoistureabsorptionresultsinexcellentdimensionalstabilityforclose-tolerancemachinedparts.Inhighmoistureorsubmergedapplications,acetalbearingsoutperformnylon4to1. Acetalisideallysuitedforclosetolerancemechanicalpartsandelectricalinsulatorswhichrequirestrengthandstiffness.Italsooffersresistancetoawiderangeofchemicalsincludingmanysolvents.Polyamideabsorbshighamountofmoisture(9-10%),itspoorfordimentionalstabilityanddecreasephysicalandmechanicalproperties.
Effect of moisture on tensile properties of reinforced nylon 6 (33% glass fiber) : tensile strength and strain at yield vs. moisture at room temperature
Impact of temperature and moisture on tensile strength of reinforced polyamide 6 (33% glass fiber)
sources :BASF Corporation 3000 Continental Drive –North Mount Olive New Jersey 07828-1234 www.basf.com/usa

7. Source : Top Ten Design Tips-a series of 10 articles. Hasenauer.J.; et.all. Dupont. Effect of moisture on physical mechanical properties

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