PA6 PA66 PA12 PA1010 Nylon Spuitgieten: Procesparameters en Materiaalkeuze

PA6, PA66, PA12 en PA1010 zijn de vier meest voorkomende spuitgieten nylonkwaliteiten, elk met verschillende vochtabsorptie, temperatuurbestendigheid en mechanische eigenschappen die ze geschikt maken voor verschillende toepassingen. Het kiezen van de verkeerde kwaliteit leidt tot dimensionale instabiliteit, bros falen of onnodige kosten. Deze gids vergelijkt alle vier kwaliteiten naast elkaar, zodat u het juiste materiaal kunt specificeren voor uw spuitgietproject.

For material background, compare external references for polyamide, Nylon 6, and Nylon 66 with your supplier’s drying data sheet. These references are useful for vocabulary, but the final processing window should still be confirmed by resin grade, moisture test, mold temperature, and trial-shot results.

Procesplanning moet ook de nylonkeuze verbinden met machine- en matrijsgedrag. Controleer de schroefhersteltijd en verblijftijd met de instellingen voor schroefherstel en verblijftijd, vergelijk het koelingseffect via productietijdanalyse en controleer het dimensionale risico via krimpanalyse van de matrijs vóór productiegoedkeuring.

Wat zijn PA6, PA66, PA12 en PA1010 Nylon-graden?

PA6, PA66, PA12 en PA1010 zijn vier semi-kristallijne polyamidegraden ontworpen voor verschillende thermische, mechanische en vochtomstandigheden. Voor leveranciersvergelijking en inkoopplanning, onze injection molding supplier sourcing guide covers RFQ prep, qualification, and commercial risk checks.

Nylon-graden zijn semi-kristallijne technische thermoplasten. Polyamide (nylon) wordt gekenmerkt door sterke waterstofbindingen tussen amidegroepen in aangrenzende polymeerketens. Deze intermoleculaire binding geeft nylon zijn kenmerkende combinatie van hoge sterkte, taaiheid en slijtvastheid. Het getal in elke graadnaam geeft het aantal koolstofatomen in het monomeer aan, wat direct van invloed is op de kristalliniteit, het smeltpunt en het vochtopnamegedrag.

Begrijpen van Polyamide Thermoplastfamilies

PA6 (polyamide 6) wordt geproduceerd door ringopeningspolymerisatie van caprolactam, een zes-koolstofmonomeer. Het smelt bij ongeveer 220°C en biedt goede mechanische eigenschappen tegen gematigde kosten. PA6 kristalliseert langzamer dan PA66, wat iets langere cyclustijden geeft maar het risico op vervorming bij complexe geometrieën vermindert. PA6 is wereldwijd de meest gespoten nylonkwaliteit qua volume, gebruikt in alles van kabelbinders tot inlaatspruitstukken voor auto's.

PA66: Hoog-stijve technische nylon

PA66 (polyamide 6,6) wordt geproduceerd door polycondensatie van hexamethyleendiamine en adipinezuur, beide zes-koolstofmonomeren. De symmetrische moleculaire structuur resulteert in een hogere kristalliniteit en een hoger smeltpunt van ongeveer 260°C. PA66 is bij kamertemperatuur ongeveer 15 tot 20 procent stijver dan PA6 en behoudt mechanische eigenschappen bij verhoogde temperaturen beter dan elke ongevulde nylonkwaliteit. Dit maakt PA66 de standaardkeuze voor motorcompartimentonderdelen in auto's en elektrische connectoren die boven 120°C werken.

PA12: Nauwkeurig nylon met laag vochtgehalte

PA12 (polyamide 12) wordt geproduceerd uit laurolactam, een twaalf-koolstofmonomeer. De langere alifatische keten vermindert de dichtheid van amidegroepen langs de polymeerketen, wat de vochtabsorptie drastisch verlaagt tot ongeveer 0,25 procent in vergelijking met 2,5 tot 3,0 procent voor PA6. PA12 smelt bij ongeveer 178°C, verwerkt gemakkelijk en biedt uitstekende dimensionale stabiliteit in vochtige omgevingen. Het heeft een aanzienlijke prijspremie ten opzichte van PA6 en PA66, typisch 3 tot 5 keer hoger per kilogram.

PA1010: Bio-Based Flexibel Nylon

PA1010 (polyamide 10,10) wordt geproduceerd uit sebaicazuur en decamethyleendiamine, beide afkomstig van ricinusolie. Deze hernieuwbare grondstofoorsprong maakt PA1010 aantrekkelijk voor toepassingen die bio-gebaseerde inhoudscertificering vereisen. PA1010 combineert lage vochtopname (ongeveer 1,0 tot 1,5 procent) met goede chemische bestendigheid en flexibiliteit, waardoor het zich positioneert tussen PA12 en PA6 in zowel prestaties als kosten. Het wordt steeds meer gebruikt in automotive brandstofleidingen en hydraulische slangen waar hernieuwbare inhoud is gespecificeerd.

Wat zijn de belangrijkste eigenschapsverschillen tussen PA6, PA66, PA12 en PA1010?

PA66 is het stijfst, PA12 neemt het minste vocht op, PA6 is het goedkoopst en PA1010 biedt de beste chemische bestendigheid. Deze verschillen beïnvloeden de onderdeelprestaties, tolerantie-stabiliteit, droogtijd en vormgevingstemperatuur. Het kiezen van de verkeerde graad kan vermijdbare vervorming, broosheid of vochtgerelateerde dimensionale drift veroorzaken.

PA6 vs PA66 vs PA12 vs PA1010 Eigenschappenvergelijking

Eigendom	PA6	PA66	PA12	PA1010
Smeltpunt	220°C	260°C	178°C	200°C
Waterabsorptie (23°C/50%RH)	2.8%	2.5%	0.25%	1.2%
Trekkracht (droog)	80 MPa	85 MPa	50 MPa	55 MPa
Buigmodulus (droog)	2,8 GPa	3,0 GPa	1,5 GPa	1,8 GPa
Izod-impact (droog)	45 J/m	40 J/m	NB*	NB*
Kosten (relatief aan PA6)	1.0x	1,15x	3.5x	2,5x

Vochtabsorptie is de belangrijkste onderscheidende factor voor verwerking en applicatieontwerp. PA6 en PA66 nemen 2,5 tot 3,0 procent vocht op in evenwicht in een omgeving met 50 procent relatieve vochtigheid, wat dimensionale uitzetting van 0,5 tot 1,0 procent veroorzaakt en de stijfheid met 50 tot 60 procent vermindert vergeleken met de droog-uit-de-matrijs-toestand. PA12 neemt slechts 0,25 procent op, waardoor de dimensionale verandering verwaarloosbaar is. Correcte spuitgietvorm design accounts for these material-specific shrinkage differences. If your application requires tight tolerances in a humid environment, PA12 is the clear choice regardless of its higher raw material cost.

De gekerfde Izod-impactwaarden gemarkeerd met NB (geen breuk) voor PA12 en PA1010 geven aan dat deze kwaliteiten van nature taai zijn en geen brosse breuk vertonen in standaard impacttests. Deze taaiheid, gecombineerd met lage vochtabsorptie, maakt PA12 en PA1010 de voorkeurskeuzes voor brandstofleidingen, hydraulische slangen en pneumatische fittingen waar slagvastheid moet worden behouden over temperatuur- en vochtigheidsbereiken.

What Are the Critical Processing Parameters for Each Nylon Grade?

Nylon processing is sensitive to moisture and melt temperature. nylon spuitgieten¹ parameters are more demanding than commodity plastics like PP or PE because of the material’s high melting temperature, narrow processing window, and sensitivity to moisture. Getting drying and melt temperature wrong is the most common cause of defective nylon parts in production.

Recommended Drying Times and Temperatures by Grade

Processing Parameters for PA6, PA66, PA12, and PA1010 Nylon Grades

Parameter	PA6	PA66	PA12	PA1010
Droogtemperatuur	80-100°C	80-100°C	70-80°C	80-90°C
Droogtijd	4-8 hours	4-8 hours	2-4 hours	3-6 hours
Target Moisture	<0.2%	<0.2%	<0.1%	<0.15%
Smelttemperatuur	240-270°C	270-300°C	190-230°C	210-250°C
Schimmel Temperatuur	60-90°C	70-100°C	30-50°C	40-70°C
Injectiedruk	80-130 MPa	90-140 MPa	70-110 MPa	75-120 MPa

Drying requirements vary significantly across the four grades. PA6 and PA66 require 4 to 8 hours at 80 to 100°C in a dehumidifying hopper dryer to reach below 0.2 percent moisture. PA12 needs only 2 to 4 hours at 70 to 80°C due to its low moisture absorption. PA1010 falls between at 3 to 6 hours at 80 to 90°C. Verify moisture content with a Karl Fischer titration test before molding. All four grades should be dried immediately before molding — leaving dried pellets exposed to ambient air for more than 30 minutes negates the drying effort.

How Does Mold Design Affect Nylon Part Quality?

Mold design is the primary driver of nylon part quality through gate shear, cooling uniformity, and vent effectiveness. Proper ontwerp van spuitgietmatrijzen³ prevents flash, weld lines, and dimensional instability that nylon hygroscopic nature amplifies.

Gate design for nylon parts should prioritize flow balance and minimize shear heating. Edge gates and submarine gates are common for PA6 and PA66 parts, while hot-runner systems with valve gates reduce material waste for high-volume production. Gate size should be 50 to 80 percent of the nominal wall thickness at the gate location to minimize jetting and ensure progressive cavity fill without freeze-off before packing is complete.

Cooling channel design directly affects cycle time and dimensional consistency for nylon parts. Because PA6 and PA66 have relatively high mold temperature requirements (60 to 100°C), conformal cooling channels provide the most uniform thermal profile and reduce warpage in complex geometries. In practice, we have found that maintaining mold temperature variation below 5°C across the cavity surface reduces dimensional scatter by 30 to 40 percent on tight-tolerance PA66 parts. This is especially critical for glass-filled grades where fiber orientation amplifies differential shrinkage.

In our Shanghai factory, we run 47 injection molding machines from 90T to 1850T clamping force, giving us the range to handle everything from micro-nylon gears on small machines to large automotive structural brackets on high-tonnage presses. Our in-house mold manufacturing facility allows us to iterate on gate placement and cooling design quickly when optimizing new nylon part programs.

Ejection system design requires extra care with nylon because the material’s high friction coefficient and shrinkage around cores create significant ejection forces. Adequate draft angle (minimum 1 degree for unfilled nylon, 1.5 to 2 degrees for glass-filled grades) and sufficient ejector pin area prevent push-pin marks and part distortion during ejection. Stripper plates are preferred for cylindrical nylon parts where concentricity matters.

What Are Common Nylon Molding Defects and How Do You Prevent Them?

The most common nylon molding defects are moisture damage (splay, hydrolysis), temperature errors (short shots, flash), and dimensional warpage. Identifying which category your defect belongs to is the fastest path to a fix.

Splay and silver streaks are the most visible moisture-related defect. These appear as fan-shaped surface marks on the part where water vapor expands rapidly as the melt enters the cavity. The fix is always more drying time or higher drying temperature — never a parameter adjustment at the machine. Check hopper dryer dew point (target below -30°C) and verify actual material moisture content with a Karl Fischer test before adjusting anything else.

Warpage in nylon parts is driven by differential shrinkage between flow and cross-flow directions, amplified by fiber orientation in glass-filled grades. The most effective countermeasure is uniform mold temperature across all cavity surfaces, followed by balanced gate placement that equalizes flow lengths. Post-molding fixtures that hold parts in the desired geometry during the first 24 hours of cooling can reduce warp by 40 to 60 percent for flat parts with varying wall thickness.

How Do You Select the Right Nylon Grade for Your Application?

The right nylon grade is determined by three factors: service temperature, tolerance needs, and chemical exposure. Match those requirements to each grade property profile below.

Nylon Grade Selection Guide by Application Requirement

Application Requirement	Recommended Grade	Key Reason
Service temperature above 120°C	PA66	Highest heat deflection temperature among the four grades
Tight tolerances in humid environment	PA12	Lowest moisture absorption (0.25%) minimizes dimensional change
Cost-sensitive structural parts below 100°C	PA6	15-25% lower material cost than PA66 with adequate performance
Fuel or chemical resistance required	PA12 or PA1010	Superior chemical resistance to hydrocarbons and solvents
Bio-based content certification needed	PA1010	Derived from renewable castor oil feedstock
Automotive under-hood components	PA66 (glass-filled)	Retains stiffness at elevated temperatures with fiber reinforcement
Medical tubing and catheters	PA12	Flexibility, biocompatibility, and chemical inertness
Electrical connectors (UL94 V0)	PA66 (flame-retardant)	Achieves V0 at 0.4mm with proper FR additives

Automotive applications consume over 40 percent of global PA66 production. Under-hood components like intake manifolds, engine covers, and radiator end tanks operate at temperatures above 120°C where PA6 loses stiffness. Electrical connectors, sensor housings, and fuse boxes use flame-retardant PA66 grades (V0 rated) that meet UL94 flammability standard requirements. Interior trim and structural brackets use PA6 or glass-filled PA6 for cost efficiency where temperature exposure is moderate.

Electrical and electronics applications leverage nylon’s excellent dielectric properties and flame retardancy. PA66 grades with red phosphorus or nitrogen-based flame retardants achieve UL94 flammability standard V0 rating at 0.4mm wall thickness, qualifying them for connectors, switches, and circuit breaker housings. The growing electric vehicle market drives demand for PA66 battery module components that combine flame retardancy with structural performance.

Consumer goods manufacturers select nylon for its balance of toughness and surface quality. Power tool housings use glass-filled PA6 for impact resistance at reasonable cost. Sporting goods like ski bindings and helmet hardware rely on PA66 fatigue resistance. Kitchen appliance components contacting hot surfaces require heat-stabilized PA66 grades rated for continuous 130°C service.

Medical device applications demand specific nylon grades with documented biocompatibility. PA12 dominates catheter and tubing uses due to flexibility and chemical inertness. PA6 serves in surgical instrument handles where autoclave sterilization requires thermal cycling between 121-134°C. ISO 10993 testing confirms biocompatibility for patient-contact applications and material traceability is mandatory for all medical nylon projects.

With over 20 years of injection molding experience and a team of 8 senior engineers, we have processed more than 400 plastic materials across our production floor. In our production reviews, our engineers track resin moisture, melt temperature, first-shot defect patterns, and dimensional drift before releasing a nylon job. Our quality workflow from IQC through process inspection to OQC catches nylon-specific defects like splay and hydrolytic degradation before they reach your assembly line.

Veelgestelde vragen

How long should I dry PA6 and PA66 before injection molding?

PA6 and PA66 require 4 to 8 hours of drying at 80 to 100 degrees Celsius in a dehumidifying hopper dryer to reach moisture content below 0.2 percent. The exact time depends on initial moisture level, pellet size, and dryer airflow capacity. PA66, with its higher melting point, is slightly more sensitive to residual moisture than PA6, so err on the longer end of the drying range when in doubt. Always verify with a calibrated moisture analyzer before starting production to avoid splay and hydrolysis defects in molded parts.

Can PA6 and PA66 be molded on the same machine without modifications?

Yes, PA6 and PA66 can run on the same machine but require different temperature profiles. PA66 needs barrel temperatures of 270 to 300 degrees Celsius versus 240 to 270 degrees Celsius for PA6. The mold temperature also differs: PA66 performs best at 70 to 90 degrees Celsius, while PA6 works at 60 to 80 degrees Celsius. Changeover requires purging the barrel thoroughly with a compatible transition material to avoid cross-contamination and degraded parts. Allow 15 to 20 minutes for temperature stabilization after adjusting the barrel settings between grades.

What happens if nylon is molded without proper drying?

Molding undried nylon causes three progressive problems. First, moisture creates surface splay marks and silver streaks that ruin part appearance. Second, water triggers hydrolysis at processing temperatures, breaking amide bonds and permanently reducing molecular weight, which lowers impact strength and elongation at break by 30 to 50 percent. Third, trapped moisture causes dimensional variation as parts absorb and release moisture unevenly during cooling. These defects cannot be repaired after molding because the polymer chain damage is irreversible and affected parts must be scrapped.

Is PA12 worth the significant price premium over PA6 for general applications?

For general-purpose applications where moisture absorption is tolerable and operating temperatures stay below 80 degrees Celsius, PA6 is more cost-effective at roughly one-third the price of PA12. PA12 justifies its premium only when you need its exceptionally low moisture absorption at 0.25 percent, superior dimensional stability in humid environments, fuel and chemical resistance for automotive fuel lines, or excellent low-temperature flexibility down to minus 40 degrees Celsius. Evaluate the total cost of quality failures and post-molding conditioning before choosing PA6 over PA12 for precision applications.

How does glass fiber reinforcement affect nylon injection molding processing?

Glass-filled nylon grades, typically 30 percent short glass fiber, require 10 to 20 degrees Celsius higher barrel temperatures and 20 to 30 percent higher injection pressures compared to unfilled grades. The glass fibers increase melt viscosity, reduce shrinkage from 1.2 percent to 0.3 percent for PA6, and improve stiffness by two to three times. Tooling wear increases significantly due to fiber abrasion, so hardened mold steel such as H13 or S136 is recommended for production runs exceeding 100,000 cycles. Screw design should use a lower compression ratio to minimize fiber breakage during plasticization.

What is the difference between conditioned and dry-as-molded nylon properties?

Dry-as-molded properties are measured immediately after molding when moisture content is near zero. Conditioned properties reflect equilibrium moisture absorption, usually reached at 50 to 60 percent relative humidity for 48 hours. Conditioned PA6 often shows 40 to 50 percent lower tensile strength but 2 to 3 times higher impact resistance than dry-as-molded data. Always specify the condition used in design calculations, tolerance reviews, and supplier RFQs so safety factors are not based on the wrong dataset. This distinction is critical for load-bearing nylon parts.

What shrinkage values should I use for nylon mold design?

Unfilled PA6 shrinks approximately 0.8 to 1.4 percent, while unfilled PA66 shrinks 1.0 to 1.5 percent, depending on wall thickness, gate location, and mold temperature settings. Glass-filled grades shrink significantly less: 0.3 to 0.7 percent for PA6-GF30 and 0.4 to 0.8 percent for PA66-GF30. Shrinkage is anisotropic in glass-filled grades, meaning flow-direction and transverse-direction shrinkage differ by 0.2 to 0.4 percent. Your mold designer must account for this anisotropy in cavity dimension calculations to achieve tight tolerances consistently across production runs.

Can nylon be over-dried before molding?

Yes, excessive drying above 110 degrees Celsius or beyond 12 hours causes thermal oxidation that yellows the pellets and reduces mechanical properties, particularly impact strength and elongation at break. For regrind or recycled nylon, the risk is higher because thermal history is cumulative across multiple processing cycles. If drying must extend beyond 8 hours due to production scheduling delays, reduce the temperature to 70 to 80 degrees Celsius to hold the material safely until production starts. Monitor pellet color as a quick visual indicator of over-drying damage.

Why ZetarMold for Nylon Injection Molding?

ZetarMold is a reliable nylon molding partner with 47 presses (90T–1850T), dedicated per-grade drying systems, and 20+ years of polyamide expertise. We maintain dedicated hopper dryers for each nylon grade to prevent cross-contamination and run automated moisture monitoring before every production shift. For complex injection mold design challenges in glass-filled nylon, our engineering team provides DFM feedback within 48 hours.

ZetarMold is een sterke nylon vormpartner omdat we 47 persen, speciale droogsystemen en 20+ jaar polyamide proceservaring combineren. We houden speciale hopperdrogers voor elke nylon kwaliteit om kruisbesmetting te voorkomen en voeren automatische vochtchecks uit voordat de productie start. Ons engineeringteam kan u helpen PA6, PA66, PA12 en PA1010 te vergelijken op tolerantie, warmte, chemische en kostvereisten voordat de tooling definitief is.

Snelle regel: Droog PA6/PA66 bij 80–100°C gedurende 4–8 uur voor het vormen. Kies PA66 voor delen boven 120°C, PA6 voor kostengevoelige structurele delen, PA12 voor flexibele of chemisch resistente applicaties, en PA1010 wanneer bio-inhoud belangrijk is.

---

1. nylon spuitgieten: Nylon spuitgieten verwijst naar het productieproces van het vormen van polyamide thermoplastische materialen met behulp van spuitgietapparatuur om technische componenten met hoge sterkte en chemische bestendigheid te produceren. ↩

2. hydrolysis: Hydrolyse is een chemische reactie waarbij watermoleculen de amidebindingen in polyamide polymerketens splitsen, waardoor het molecuulgewicht permanent wordt verlaagd en de mechanische eigenschappen van nylonmaterialen worden aangetast. ↩

3. ontwerp van spuitgietmatrijzen: spuitgietmatontwerp verwijst naar de technische discipline die gereedschapsgeometrie, koelkanalenlayout, gateplaatsing en ejectiesysteemoptimalisatie omvat voor het produceren van dimensionaal nauwkeurige plastic onderdelen. ↩