PA6 PA66 PA12 PA1010 Nylon-Spritzguss: Prozessparameter und Materialauswahl

PA6, PA66, PA12 und PA1010 sind die vier am häufigsten verwendeten Spritzgießen Nylonsorten, jede mit unterschiedlicher Feuchtigkeitsaufnahme, Temperaturbeständigkeit und mechanischen Eigenschaften, die sie für verschiedene Anwendungen geeignet machen. Die Wahl der falschen Sorte führt zu Maßinstabilität, sprödem Versagen oder unnötigen Kosten. Dieser Leitfaden vergleicht alle vier Sorten direkt miteinander, sodass Sie das richtige Material für Ihr Spritzgussprojekt auswählen können.

Für den Materialhintergrund vergleichen Sie externe Referenzen für Polyamid, Nylon 6 und Nylon 66 mit dem Trocknungsdatenblatt Ihres Lieferanten. Diese Referenzen sind für das Vokabular nützlich, das endgültige Prozessfenster sollte jedoch weiterhin durch Harzsorte, Feuchtigkeitstest, Formtemperatur und Probeschussergebnisse bestätigt werden.

Die Prozessplanung sollte auch die Nylonauswahl mit dem Maschinen- und Formverhalten verknüpfen. Überprüfen Sie die Schneckenrückgewinnung und die Verweilzeit mit der Einrichtung für Schneckenrückgewinnung und Verweilzeit, vergleichen Sie die Kühlwirkung durch Produktionszeitanalyse und prüfen Sie das Maßrisiko durch Schrumpfungsanalyse der Form vor der Produktionsfreigabe.

Was sind PA6-, PA66-, PA12- und PA1010-Nylonsorten?

PA6, PA66, PA12 und PA1010 sind vier teilkristalline Polyamid-Typen, die für unterschiedliche thermische, mechanische und Feuchtigkeitsbedingungen ausgelegt sind. Für Lieferantenvergleich und Beschaffungsplanung, unsere injection molding supplier sourcing guide covers RFQ prep, qualification, and commercial risk checks.

Nylonsorten sind teilkristalline technische Thermoplaste. Polyamid (Nylon) zeichnet sich durch starke Wasserstoffbrückenbindungen zwischen Amidgruppen in benachbarten Polymerketten aus. Diese intermolekularen Bindungen verleihen Nylon seine charakteristische Kombination aus hoher Festigkeit, Zähigkeit und Abriebfestigkeit. Die Zahl in jedem Sortennamen gibt die Anzahl der Kohlenstoffatome im Monomer an, was sich direkt auf den Kristallinitätsgrad, den Schmelzpunkt und das Feuchtigkeitsaufnahmeverhalten auswirkt.

Verständnis der Polyamid-Thermoplast-Familien

PA6 (Polyamid 6) wird durch ringöffnende Polymerisation von Caprolactam, einem sechs Kohlenstoffatome umfassenden Monomer, hergestellt. Es schmilzt bei etwa 220°C und bietet gute mechanische Eigenschaften zu moderaten Kosten. PA6 kristallisiert langsamer als PA66, was etwas längere Zykluszeiten bedeutet, aber das Verzugrisiko bei komplexen Geometrien verringert. PA6 ist weltweit die mengenmäßig am häufigsten verarbeitete Nylonsorte und wird für alles von Kabelbindern bis hin zu Automobil-Ansaugkrümmern verwendet.

PA66: Hochsteifes Technisches Nylon

PA66 (Polyamid 6,6) wird durch Polykondensation von Hexamethylendiamin und Adipinsäure hergestellt, beides Sechskohlenstoff-Monomere. Die symmetrische Molekularstruktur führt zu einer höheren Kristallinität und einem höheren Schmelzpunkt von etwa 260°C. PA66 ist bei Raumtemperatur etwa 15 bis 20 Prozent steifer als PA6 und behält mechanische Eigenschaften bei erhöhten Temperaturen besser als jeder ungefüllte Nylon-Typ. Dies macht PA66 zur Standardwahl für Motorraumkomponenten in der Automobilindustrie und elektrische Steckverbinder, die über 120°C betrieben werden.

PA12: Präzisionsnylon mit geringer Feuchtigkeitsaufnahme

PA12 (Polyamid 12) wird aus Laurolactam, einem zwölf Kohlenstoffatome umfassenden Monomer, hergestellt. Die längere aliphatische Kette verringert die Dichte der Amidgruppen entlang der Polymerhauptkette, was die Feuchtigkeitsaufnahme im Vergleich zu 2,5 bis 3,0 % bei PA6 auf etwa 0,25 % drastisch senkt. PA12 schmilzt bei etwa 178°C, lässt sich leicht verarbeiten und bietet hervorragende Maßstabilität in feuchter Umgebung. Es hat einen erheblichen Preisaufschlag gegenüber PA6 und PA66, typischerweise das 3- bis 5-fache pro Kilogramm.

PA1010: Bio-basiertes flexibles Nylon

PA1010 (Polyamid 10,10) wird aus Sebacinsäure und Decamethylendiamin hergestellt, beide aus Rizinusöl gewonnen. Dieser nachwachsende Rohstoffursprung macht PA1010 attraktiv für Anwendungen, die eine Zertifizierung biobasierter Inhalte erfordern. PA1010 kombiniert niedrige Feuchtigkeitsaufnahme (etwa 1,0 bis 1,5 Prozent) mit guter Chemikalienbeständigkeit und Flexibilität und positioniert sich zwischen PA12 und PA6 sowohl in Leistung als auch Kosten. Es findet zunehmend Verwendung in Kraftstoffleitungen und Hydraulikschläuchen im Automobilbereich, wo nachwachsende Inhalte vorgeschrieben sind.

Was sind die wichtigsten Eigenschaftsunterschiede zwischen PA6, PA66, PA12 und PA1010?

PA66 ist am steifsten, PA12 nimmt am wenigsten Feuchtigkeit auf, PA6 ist am kostengünstigsten und PA1010 bietet die beste Chemikalienbeständigkeit. Diese Unterschiede beeinflussen Bauteilleistung, Maßhaltigkeit, Trocknungszeit und Verarbeitungstemperatur. Die Wahl des falschen Typs kann vermeidbare Verzugsspannungen, Sprödigkeit oder feuchtigkeitsbedingte Maßänderungen verursachen.

PA6 vs PA66 vs PA12 vs PA1010 Eigenschaftsvergleich

Eigentum	PA6	PA66	PA12	PA1010
Schmelzpunkt	220°C	260°C	178°C	200°C
Feuchtigkeitsaufnahme (23°C/50% relative Luftfeuchtigkeit)	2.8%	2.5%	0.25%	1.2%
Zugfestigkeit (trocken)	80 MPa	85 MPa	50 MPa	55 MPa
Biege-E-Modul (trocken)	2,8 GPa	3,0 GPa	1,5 GPa	1,8 GPa
Izod-Schlagzähigkeit (trocken)	45 J/m	40 J/m	NB*	NB*
Kosten (relativ zu PA6)	1.0x	1,15x	3.5x	2,5x

Moisture absorption is the single most important differentiator for processing and application design. PA6 and PA66 absorb 2.5 to 3.0 percent moisture at equilibrium in a 50 percent relative humidity environment, which causes dimensional swelling of 0.5 to 1.0 percent and reduces stiffness by 50 to 60 percent compared to the dry-as-molded state. PA12 absorbs only 0.25 percent, making its dimensional change negligible. Proper Spritzgussform 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.

The notched Izod impact values marked NB (no break) for PA12 and PA1010 indicate that these grades are inherently tough and do not exhibit brittle fracture in standard impact tests. This toughness, combined with low moisture absorption, makes PA12 and PA1010 the preferred choices for fuel lines, hydraulic tubing, and pneumatic fittings where impact resistance must be maintained across temperature and humidity ranges.

Was sind die kritischen Verarbeitungsparameter für jede Nylonsorte?

Nylon processing is sensitive to moisture and melt temperature. Nylon-Spritzgießen¹ 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
Trocknungstemperatur	80-100°C	80-100°C	70-80°C	80-90°C
Trocknungszeit	4-8 hours	4-8 hours	2-4 hours	3-6 hours
Target Moisture	<0.2%	<0.2%	<0.1%	<0.15%
Schmelztemperatur	240-270°C	270-300°C	190-230°C	210-250°C
Temperatur der Form	60-90°C	70-100°C	30-50°C	40-70°C
Einspritzdruck	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.

Wie beeinflusst das Formendesign die Qualität von Nylonbauteilen?

Mold design is the primary driver of nylon part quality through gate shear, cooling uniformity, and vent effectiveness. Proper Spritzgussformdesign³ 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.

Was sind häufige Fehler beim Nylon-Spritzgießen und wie werden sie vermieden?

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.

Wie wählen Sie die richtige Nylonsorte für Ihre Anwendung aus?

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.

Häufig gestellte Fragen

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.

Warum ZetarMold für die Nylon-Spritzgussfertigung?

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 a strong nylon molding partner because we combine 47 presses, dedicated drying systems, and 20+ years of polyamide processing experience. We maintain dedicated hopper dryers for each nylon grade to prevent cross-contamination and run automated moisture checks before production starts. Our engineering team can help you compare PA6, PA66, PA12, and PA1010 against tolerance, heat, chemical, and cost requirements before tooling is finalized.

Faustregel: Dry PA6/PA66 at 80–100°C for 4–8 hours before molding. Choose PA66 for parts above 120°C, PA6 for cost-sensitive structural parts, PA12 for flexible or chemical-resistant applications, and PA1010 when bio-content matters.

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1. Nylon-Spritzgießen: Nylon-Spritzgießen bezeichnet das Herstellungsverfahren zur Formgebung von Polyamid-Thermoplasten mithilfe von Spritzgießanlagen zur Produktion von technischen Bauteilen mit hoher Festigkeit und Chemikalienbeständigkeit. ↩

2. Hydrolyse: Hydrolyse ist eine chemische Reaktion, bei der Wassermoleküle die Amidbindungen in Polyamid-Polymerketten spalten, wodurch das Molekulargewicht dauerhaft verringert und die mechanischen Eigenschaften von Nylonmaterialien abgebaut werden. ↩

3. Spritzgussformdesign: Spritzgießwerkzeug-Design bezeichnet die technische Disziplin, die Werkzeuggeometrie, Kühlkanalanordnung, Angussplatzierung und Auswerfersystemoptimierung zur Herstellung maßgenauer Kunststoffteile umfasst. ↩