Stanyl®General Information on Properties

The World's Most Versatile High Temperature Thermoplastic 2

Stanyl High Flow 2

Characteristics of Stanyl 4

Chemical Resistance 4

Thermal Properties 6

Mechanical Properties 8

Electrical Properties 11

Flame Retardancy 12

Effects of Moisture 13

Wear & Friction 17

Designing with Stanyl 19

Processing with Stanyl 20

Processing with Stanyl High Flow 20

Stanyl® General Information on Properties

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Stanyl® is a registered tradename of Royal DSM.

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The World’s Most Versatile High Temperature Thermoplastic

Figure 1 Spiral flow versus tensile strength. Stanyl® is a high performance polyamide thatprovides unmatched performance and valueacross an amazingly broad range of applications.Its versatility derives from its unique set of properties, the core of which are:

– Highest mechanical property retention at high temperatures

– Excellent resistance to wear and friction

– Outstanding flow for easy processing and exceptional design freedom

Stanyl has a unique property profile thatprovides the best solution for many applicationsthat need outstanding performance. Stanylgrades are based on polyamide 46, a highly crystalline material with a melting temperatureof 295ºC (560°F). Its toughness and high mechanical strength combine with exceptionalflow to give the widest design freedom possiblein engineering plastics.

Product Scope. Stanyl is offered in a wide varietyof grades including unreinforced and gradescontaining glass fiber, mineral, lubricants, and/orflame retardants. A list of the most importantgrades can be found in Table 1.

Stanyl High Flow™

Stanyl High Flow combines the high strengthand toughness levels of the standard Stanyl PA46with excellent flow characteristics virtually thesame as Liquid Crystal Polymers (LCP), a materialoften used for Information and CommunicationTechnology (ICT) equipment (see Figure 1).

The Stanyl High Flow V-0 grades can replace LCP,resulting in a cost savings up to 50%. Stanyl46HF5040 is a standard High Flow 40% glassfiber reinforced, flame retardant grade.46HF5050 is developed for improveddimensional stability combined with excellentmechanical performance while 46HF5041LW wasdesigned for improved dimensional stabilitywith minimum warpage.H

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Stanyl High Flow 46HF5040 has an UnderwritersLaboratories (UL) 94 V-0 rating at 0.35 mm for allcolors and a UL approval for 50-100% regrind use.Stanyl High Flow 46HF5050 and 46HF5041LWhave an Underwriters Laboratories (UL) 94 V-0rating at 0.4 mm for natural and black; UL yellowcard file numbers for Stanyl PA46 are E47960,E43392 (US) and E172082 (Japan). Stanylinherently offers high toughness, even in dry-as-molded conditions. The weld-line strength of thenew High Flow flame retardant grades is threetimes higher than that of LCP. This enablesconnector manufacturers to post-insert pinsdirectly after injection molding without the riskof cracking, thereby reducing reject levels.

Stanyl High Flow grades for high pin densityconnector applications include:

– 46HF5040 - extremely high flow

– 46HF5050 - extremely high flow, low warpagetendency, improved dimensional stability

– 46HF5041LW - extremely high flow, very low warpage tendency, improved dimensional stability

Stanyl High Flow grades for automotive andmetal replacement include:

– TW241F12 - specifically targeted for metalreplacement applications

– 46HF4130 - specifically targeted for thin wall automotive connector and other encapsulation applications

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Table 1 Stanyl product portfolio.

strength - toughness - high flow

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Characteristics of Stanyl

Chemical Resistance

Polyamides are well known for their resistance toa wide range of chemicals. Stanyl is no exception.At higher temperatures its resistance to oils andgreases is excellent (see Figures 2-4).

Stanyl also has an outstanding resistance to fuels(see Figure 5), with low permeation levels (seeFigure 6) even for alcohol containing fuels.Stanyl is therefore an ideal material for applica-tions under the hood in the automotive industryand for other industrial applications such as gearsand bearings.

As with all other polyamides, Stanyl is attacked bystrong mineral acids and absorbs polar solvents.For more information concerning the resistance ofStanyl to various chemicals and solvents referencethe chemical resistance chart at www.stanyl.comor contact your local DSM sales office.

Figure 3 Retention of mechanical properties (30% glass fiber reinforced polyamides)after immersion in hot oil.

Figure 2 Oil stability, aging at 150°C – testing at 150°, absolute values.

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Figure 5 Fuel resistance 85% Methanol, 15% unleaded fuel.

Figure 6 Fuel permeation M25 at 60˚C.

Figure 4 Influence of immersion in oil on flexural strength of 30% glass fiber reinforced polyamides.

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resistance to oil - grease - & fuel

Figure 9 Positioning of thermoplastics according to ARO principle.

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Figure 7 Flexural modulus versus temperature.Thermal Properties

Stanyl has a temperature resistance similar to highheat materials like PPS, polysulfones, PEI and LCP'sand above the well-known engineering plasticssuch as polyamide 6 or 66 and polyesters. Stanylstands out from these other materials through itsmechanical performance over the full temperaturerange. This is a critical factor in today's high-techworld where performance over a wide temperaturerange can often be of critical importance.

When designing with thermoplastics, the proper-ties of a material for a given set of environmentalconditions need to meet the critical design levelrequired of the component. Most propertiesdecrease as temperature increases and heat agingalso occurs. Consequently performance at hightemperature, either continuous and/or short term,needs to be considered when high temperatureconditions apply.

Short-term heat performance. An indication forthe short term temperature performance of amaterial is its stiffness and strength level at elevat-ed temperatures, for instance between 100°C and290°C.This stiffness/strength level at elevated tem-peratures should be considered as the critical levelto design for, since room temperature levels forstiffness/strength are in general much higher, evenafter moisture absorption.

The melting point in combination with the HeatDistortion Temperature (HDT) gives another goodimpression of the peak temperature resistanceunder a certain load. The HDT is defined as the temperature at which a test bar is deformed to agiven extent at a given load applied; this is relatedto a certain level of stiffness at the elevated temperature. Due to its excellent retention of stiff-ness at higher temperatures, Stanyl's HDT-rating of190°C (375ºF) for unreinforced and 290°C (555ºF) forreinforced grades is higher than that of other engi-neering plastics or high performance materials.

Long-term heat performance. For designers it iscrucial to know the performance level of the endproduct and therefore of the material at the end ofits lifetime, which often means after exposure forthousands of hours to heat in an oxygen environ-ment. This performance, the heat or air aging resis-tance, can be expressed in various ways. Differentparameters like strength, stiffness, impact resis-tance, elongation at break can be selected tomonitor the performance after heat aging overtime and measured either at room temperature orat the elevated temperatures.

Figure 8 HDT of Stanyl versus LCPs.

Figure 10 Tensile strength at 23°C after heat aging at 150°C for Stanyl and competitivethermoplastics.

Table 2 Heat aging resistance as expressed by the CUT and ARO-concept and stiffness atelevated temperatures for Stanyl and competitive polyamides (30-33% GF reinforced).

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Figure 11 Absolute level of tensile strength at real operating temperature (150°C) afterheating at 150°C for Stanyl and competitive thermoplastics.

HDT - heat aging - CUT

The results of these measurements can again bedisplayed in various ways; in a relative way viaretention levels or via relative characteristics likeContinuous Use Temperature and RelativeTemperature Index, or in an absolute way, usingthe Absolute Real Operating (ARO) Value conceptwhich shows the absolute value of the propertymeasured, for instance at 150°C (300ºF) after agingfor several thousands of hours at 150°C.

The Continuous Use Temperature (CUT) is fre-quently used in the automotive industry as aselection criterion. It is defined as the temperatureat which a given mechanical property, usuallytensile strength or impact resistance, decreases by50% within a certain period of time, usually 500,1000, 5000, 10000 or 20000 hours. Stiffness andtensile elongation cannot be used to measure CUTsince stiffness only increases after heat aging andtensile elongation shows a too sharp, non-discrim-inating drop for all materials. The CUT of 30% glassfiber reinforced Stanyl at 5000 hours is 175°C; thedrop in tensile strength is 50% after 5000 hours ofaging at 175°C. The different CUTs for differentaging times are summarized in the Table 2.

The Relative Temperature Index as given by UL iscommonly used in the E&E industry. It can be con-sidered to a certain extent as a CUT for very longhalf-life times ranging between 60,000 and100,000 hours. The RTI of heat stabilized Stanyl30% GF is 140°C (280ºF).

The Absolute Real Operating Value after heataging gives designers more realistic comparisonsbetween the various materials. It overcomes themajor drawbacks of the CUT and RTI concepts inthat only the retention of properties is consideredand these properties are only measured at roomtemperature after heat aging. Certain materialsthat start at a very low level but retain this level toa high degree, as for instance PPS (Figure 10), arerated better in CUT terms than other materialswhich start at a higher level but show more of areduction. Such materials can still outperform theformer materials in absolute values after the heataging exposure.

In addition, the CUT is based on measurements ofproperties at room temperature, while the morecritical design levels are to be expected in the elevated temperature range.

The ARO concept, demonstrated in Table 2 andFigure 11, shows the superiority of Stanyl in comparison with PA66, PPA and PPS after heataging at 150°C (300ºF).

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Mechanical Properties

The mechanical properties of Stanyl depend ontemperature, moisture content, and aging time.The composition of the compound, particularlythe type and amount of reinforcement and additives, has a large influence on the absolutelevel of these properties.

Stiffness. Due to its high crystallinity, Stanylretains a high level of stiffness up to temperatures very close to its melting point. Thisprovides wider safety margins for critical applications than standard engineering plastics(e.g. PA6, PA66, and polyesters). Other high heatresins (e.g. PPA and PPS) have a very highmodulus at room temperature but show a significant drop in stiffness at elevated temperatures [above 100°C (210°F)] In practice,Stanyl has a higher stiffness at temperatures>100°C (210°F).

The stiffness advantage offered by Stanyl atelevated temperatures can be exploited bydesigning components with reduced wallsections, some 10 to 15% thinner than thosenecessary compared to PPA or PPS with the samelevel of glass fiber reinforcement. The weightsavings achieved with Stanyl are important forautomotive and aviation applications whereweight is a vital issue. By adding reinforcements,stiffness levels can be increased further.

Creep resistance. For optimum performanceand maximum lifetime, engineering plastics,which are subjected to long-term loading,must have a high creep resistance (i.e. lowplastic deformation under load). Stanyl's highcrystallinity results in an excellent retention ofstiffness at elevated temperatures [above100°C (210°F)] and hence in a creep resistancewhich is superior to that of engineeringplastics and other heat-resistant materials.

Figure 12 Flexural modulus versus temperature.

Figure 13 Effect of glass fiber reinforcement on the creep modulus of Stanyl at 140°C (285°F).

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Creep behavior is one of the factors that limitthe maximum application temperature of amaterial. When Stanyl and PA66 or PPA arecompared at the same temperature exposure,several alternatives exist:

– Decrease the wall thickness by using Stanyl(with an equivalent level of reinforcement)

- Reduces material usage and cost

– Use a Stanyl grade with a lower level of rein-forcement than is possible with PA66 (forequal wall thickness)

- Giving greater design freedom due to ahigher elongation at break

- Facilitating the use of snap-fits

- Lowering material consumption per partdue to a lower density

Only Stanyl offers a real performanceimprovement over PA66 (see Figure 14).

Toughness and fatigue. Toughness, or ductility,is usually measured by impact resistance(related to high speed) and (tensile) elongation(low speed). While tensile and flexural strengthdecrease with increasing temperature, toughnessincreases. Therefore, toughness is usually mostcritical at lower temperatures. For automotiveapplications indeed the low temperatureimpact at -30 or -40°C is critical. For many E&E applications, toughness at room temperature orelevated temperatures is important in processessuch as pin insertion, winding operation andsoldering. Due to its fine crystalline structure,Stanyl exhibits unmatched toughness/ductilityin comparison with many other engineeringplastics/heat resistant resins. Notched Izod orCharpy impact values remain at a high leveleven at temperatures below 0°C (32°F). Theseare detailed further in the Product Databasefound at www.dsmep.com.

Figure 15 Creep modulus of unreinforced polyamides at 120°C load 10 MPa.

Figure 16 Impact (23°C DAM) and temperature resistance of unreinforced thermoplastics.

Figure 14 Creep behavior of glass fiber reinforced Stanyl versus competitive glassfiber reinforced materials at 160°C and load 20 MPa.

superior stiffness - unmatched toughness

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The effect of different amounts of glass fiber reinforcement is different for bothtoughness parameters. With increasing rein-forcement percentages, the elongation at breakdecreases while the Izod or Charpy impactresistance increases.

The Izod or Charpy impact resistance of glassfiber reinforced Stanyl is also unmatched. Thismakes Stanyl the material of choice fordemanding applications and facilitates furtherassembly steps, for instance using inserts andsnap-fits. The very high elongation at break ofStanyl offers the best solution for thin-walledparts, film hinges, and insert molding (eg ingears and pulleys).

The high crystallinity and fine crystalline structure of Stanyl lead to a fatigue resistance superior to that of most other engineering and heat-resistant resins.

Stanyl offers a significant improvement infatigue resistance compared to PA66, PPA andPPS for high temperature applications.Fatigue resistance is particularly importantfor gears, charge-air coolers, air ducts, andchain tensioners.

Figure 17 Impact resistance of glass fiber reinforced thermoplastics.

Figure 18 Tensile and temperature behavior of 30% glass fiber reinforced thermoplastics.

Figure 19 Fatigue behavior of glass fiber reinforced Stanyl versus polyamide 66 and PPA.

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Electrical Properties

When using Stanyl in E&E applications one of the main functions is electrical insulation. Theinsulating power of a thermoplastic can beexpressed in several ways:

– The material conducts current homogeneously,through the bulk or via the surface.(Related properties: volume resistivity anddielectric strength.)

– The material breaks down and conductingpaths are formed through the bulk.(Related properties: breakdown voltage anddielectric strength.)

– The surface is degraded gradually by theelectric field, arcing and/or contamination, andconducting paths are formed in the surface.(Related properties: arc resistance, high voltagetracking rate and comparative tracking index.)

– Also heat formation, caused by abovephenomena (or by other electrical sources) mayignite the material.(Related properties: hot wire ignition and high-ampere arc ignition.)

– The combination of metal, insulating material,moisture and contaminants may cause specialchemical and physical degradation processes.(Related properties: electrolytic corrosion.)

– Effects of alternating current are polarization(loss of current and electronic signal noise),related to the dielectric constant anddissipation of energy (temperature rise),related to dissipation factor or loss index.

The exact levels of the electrical properties mentioned above depend on the specific grade,temperature, and moisture content. In generalthese properties are sufficiently retained atelevated temperatures to fulfill criticalapplication requirements. More detailedinformation is available under Product Data atwww.dsmep.com or at www.ul.com

Figure 20 Low and stable dielectric constant of Stanyl at high frequencies.

In addition, Stanyl offers low and stable values fordielectric constants at high frequencies which iskey in designing today's IT connectors. Moistureuptake may increase the dielectric constant,however this effect is only seen at low frequen-cies and not at the high frequencies typicallyencountered in current or future IT equipment(see Figure 20). DSM has developed a Stanyl port-folio combining excellent performance for E&Eapplications with outstanding long-term perfor-mance, including several High Flow grades (see Table 1 on Page 3).

low & stable dielectric constant

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Flame Retardancy

UL classifications. A number of flame-retardantgrades have been developed, rated V-0 accordingto the Underwriters Laboratories UL 94 classifi-cation [even at 0.35 mm (0.01 in)]. These includeHigh Flow flame retardant grades. For many ofthese grades 50-100% regrind V-0 ratings havebeen obtained which gives advantages throughlower waste generation and lower materialcosts. Unmodified, unreinforced Stanyl gradesare rated V-2 and the glass fiber reinforcedgrades without flame retardant are rated HB.Other classifications according to a number of ULstandards have been obtained for differentStanyl grades.

In Table 3, the most important ratings accordingto UL 1446 have been summarized. The class H[180°C (355°F)] rating according to UL 1446 for theglass fiber reinforced grades of Stanyl is note-worthy. A complete overview of all UL listings isavailable at your local DSM sales office or atwww.ul.com.

Flammability. Flammability of materials can alsobe expressed in terms of glow wire ignition tem-perature and glow wire flammability index. Thisis to simulate the short-term effect of thermalstresses caused by e.g. heat sources (heatingelements) or overloaded resistors. Testing of endproducts is required in safety standards for allkinds of electrotechnical equipment.

Glow wire ignition temperature and glow wireflammability index can be used for pre-selectionof materials for such applications. Both glowwire ignition temperature and flammabilityindex depend on the thickness of the samplesand the specific grade. For an overview for Stanylgrades see Table 4 (measured according to IEC60695-2-12 GWIT and IEC 60695-2-13 GWFI). Moredetailed information is also available in theproduct database at www.dsmep.com.

Table 3 UL 1446 insulation system recognition for Stanyl.

Table 4 Glow wire flammability index for Stanyl grades.

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Effects of Moisture

As with any other polyamide, Stanyl absorbsmoisture reversibly due to the presence of the amide groups in the molecular chain.Moisture absorption is dependent on thetemperature, the relative humidity of theenvironment, and the wall thickness of thespecific part. In general moisture absorptionresults in a decrease of the glass transitiontemperature (see Figure 21), which may lead toan increase in toughness and reduction instiffness and strength at room temperature.

This drop in stiffness for Stanyl is smallcompared to the drop for other polyamides dueto Stanyl’s high level of crystallinity. Theperformance above the glass transitiontemperature [75°C(165˚F)] is not affected bymoisture uptake. As Stanyl is typically used athigher operating temperatures, the effect ofmoisture will not be noticed.

Competitive materials such as semi-aromaticpolyamides have a higher Tg, often in theoperating temperature range. A shift in Tg dueto moisture uptake will in this case lead to achange in properties at the critical operatingtemperatures.

In addition, due to this higher Tg, higher moldtemperatures are required, resulting in the needfor oil or electrically heated molds, with highersafety risks, higher mold and maintenance costs,and more difficult processing.

For prolonged exposure above 100ºC (210˚F),Stanyl dries out, especially rapidly at higher tem-peratures, and properties will approach thosegiven by the "dry" curve. This leads to aconsistent property profile over a widetemperature range, especially once the effects ofannealing are taken into account.

Figure 21 Shear modulus of glass fiber reinforced thermoplastics.

high crystallinity

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Moisture uptake leads to dimensional changes.However, because highly filled compounds areused, in many applications this dimensionalchange is limited. Due to glass fiber orientation,dimensional changes mainly take place in thedirection perpendicular to the flow direction(thickness of the part, see Tables 6 and 7).This is thedirection that in terms of dimensions is often theleast critical. The effect of moisture on dimensionsis small compared to the dimensional change dueto temperature changes (Coefficient of LinearThermal Expansion, see Table 5). Stanyl exhibitsexcellent performance in many applications where dimensions are very critical, including many small connectors, gears, or SMT components. ForE/E applications where dimensional stability isvery critical, special flame retardant, reinforcedgrades have been developed: 46HF5050 and46HF5041LW.

Moisture absorption usually takes place atroom temperatures. This is a rather slowprocess taking a long time before equilibrium isreached. When using the application at operatingtemperatures, which for Stanyl parts is oftenabove 100°C (210˚F), drying is extremely fast.Therefore, full saturation is not seen in typicalapplications (see Figure 22) and effects of mois-ture uptake are very limited.

Table 5 Typical CLTE values for Stanyl grades.

Table 7 Dimensional change as a function of moisture uptake of flame retardant grades.

Figure 22 Water absorption at 23°C/50%RH followed by desorption at 180°C of Stanyl(3.2 mm thickness sample).

Note: oriented part: thickness 2mm / non oriented part: thickness 3-4 mm

Table 6 Dimensional change as a function of moisture uptake of non-flame retardant grades.

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annealing

Annealing significantly reduces moistureuptake. Moisture absorption is significantlyreduced upon annealing of Stanyl. Annealingresults in densification of the amorphous part ofStanyl upon exposure at high temperatures (>100°C). This phenomenon is unique for Stanyland is irreversible. Annealing takes place duringoperation at elevated temperatures in forinstance automotive applications. Annealingmay result in a moisture uptake reduction by afactor three. Annealing can also be used as aseparate step to improve the dimensional stability of Stanyl parts (preferably using anitrogen atmosphere). Moisture uptake reductiondepends on the annealing time and temperature.DSM has developed a model to quantify this.Please contact your local sales engineer for further information.

Properties such as stiffness, strength, fatigue,creep and abrasion resistance are generallyimproved upon annealing while toughness mightbe slightly reduced, although still at a level thatoutperforms competitive materials.This leads to astrongly improved property profile for applica-tions such as gears.

Figure 23 Reduction of water uptake of Stanyl GF and competitive materials at severalannealing conditions.

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Blistering. Moisture uptake at extreme humiditiesmay lead to blistering during soldering at veryhigh peak temperatures close to a material’s HDT.This is a phenomenon not unique to Stanyl. It isalso observed for other polyamides and even forLCPs. Blistering can be prevented by protectionfrom moisture, and optimized processing.

Molded part after molding

– Keep parts under dry circumstances as much as possible.

– Record the actual molding date to control thetime to re-flow process.

Detailed information on blistering in connectorscan be found at www.dsmep.com.

Moisture control during processing. During meltprocessing, a high moisture content may lead tothe occurrence of silvery streaks or splash markson the surface of the final parts. In extreme casesit may lead to degradation of the base polymerresulting in a drop in viscosity. To prevent thisStanyl granules are supplied dry in airtight,moisture proof bags. Should your Stanyl materialcome into contact with ambient air for extendedperiods, moisture will be absorbed and it shouldbe dried prior to processing.

Drying

– Dryer should be a dehumidifying dryer orvacuum dryer (not hot air oven).

– Material before molding should contain below0.1% moisture.

– Regrind material also should be dried beforemolding.

– Regrind material size should be uniform asmuch as possible.

– Content of regrind material should be controlled.

Molding

– Temperature at the nozzle should be controlledprecisely.

– Frequently check the wear of sealing ring at the front.

– Tool temperature should be set between 80 to 120°C(175 - 250˚F).

– Barrel temperature setting should be set 310˚C+/-10°C (could be different for High Flow grades.Contact your local sales representative for moreinformation).

– Keep residence time in screw as short as possible.

– Keep screw RPM as low as possible.

– Backpressure should be set around 5 kg/cm2.

– Injection speed should be set as fast as possible.

– Select suitable holding pressure and time.

– Suckback should be set as low as possible.

– At the start purge should be done sufficiently.

Tool design

– Sprue/runner/gate should not be too small.

– Top of the submarine gate should be "R" design.

– Gas release should be set sufficiently at the edge.

– Cooling the tool should be uniform especially for the core.

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Wear & Friction

Stanyl has an excellent abrasion resistance (orwear resistance) and outperforms most otherengineering/high performance plastics undermost conditions but especially at higher temperatures and/or high torque/loads.Although the coefficients of friction of standardgrades of these materials are quite similar,Stanyl outperforms its competitors. The mainreason is its higher PV rating, which permitshigher pressures or velocities to be used.

Where other materials fail when usingdemanding application conditions (high tem-perature, high loads, high velocities, harshchemical environment, vibrations) due tomelting (POM, PA6), brittle behavior (PPS, PPAs),low stiffness at high temperatures (POM, PPS,PA6, PA66, PPAs) or high abrasiveness (PPS),Stanyl will deliver smooth and reliable perfor-mance (see Figures 24-29).

Modified Stanyl grades with even better wearproperties are available in unreinforced as wellas glass fiber reinforced form. Its smooth andtough surface, combined with its stiffness atelevated temperatures, high melting point, highfatigue and vibration resistance, high resistanceagainst crack propagation and resistanceagainst oil and greases, make Stanyl an idealmaterial for sliding parts like valve lifter guides,chain tensioners (see Figure 27), gears, bushings,and thrust washers.

Figure 24 Comparison between Stanyl, PA66, & POM with respect to Taber Abrasion Test(ASTM D1044).

Figure 26 Stanyl performs better than PPA at high PV combinations.

Figure 25 Stanyl performs better than POM at high PV combinations.

wear resistance at high temperatures

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Figure 28 Stanyl performs better than PPS at high PV combinations.

Figure 29 Stanyl performs better than PA6 and PA66 at both low and high PV combinations.

Figure 27 Chain tensioner wear testing: Stanyl UF outperforms PA66 UF.

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Due to its unique combination of properties,Stanyl can compete across a wide range of theengineering plastics market. Some applicationswhich might be designed in polyamide 6 or 66may actually be more economical to produce inStanyl if Stanyl’s faster crystallization rates canbe used to advantage by reducing cycle timesenough to more than offset the higher cost ofStanyl. In addition, Stanyl is often used in appli-cations originally thought to be reserved for hightemperature amorphous resins such as PES, dueto the high continuous use temperature ratingsof these resins. In fact, Stanyl’s higher deflectiontemperatures under load and higher shearmodulus at elevated temperatures make it thebetter choice. Stanyl’s high flow characteristicshave allowed it to work in application areas oncereserved only for LCPs.

When designing for electrical / electronic appli-cations Stanyl provides thinner wall sections,long flow paths, multi-cavity tools, lower scrap rates (complete fill of cavities, lowerbreakages on demolding), lower rejects on pininsertion, and higher pin retention for moredurable components.

For more information on designing with Stanylvisit www.dsmep.com.

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Designing with Stanyl

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Processing with Stanyl

Stanyl combines excellent flow properties during injection molding with a high level of mechanical properties (strength, toughness andstiffness), short cycle times (high productivity)and high temperature resistance (high heatdistortion temperature, high melting point).Therefore Stanyl can be used in thin walledapplication (like connectors).

Processing with Stanyl High Flow. Flow is evenfurther improved for Stanyl High Flow grades,matching flow of the best flowing LCPs whilemaintaining high level of mechanical properties,a unique combination! Three commercial flameretardant High Flow grades (UL-94 V-0 ratings) are available for E&E applications (includingimproved dimensional stability grades) as well as two non flame retardant materials.Visit the material database at www.dsmep.comfor Stanyl 46HF designated grades.

Stanyl High Flow grades can replace LCP, result-ing in cost savings of up to 50% due to bettermechanical properties (eg weldline strength)good pin retention and low rejects levels.Components made of Stanyl High Flow maintaintheir dimensional integrity during reflow solder-ing up to 280°C (535°F) due to the extreme highstiffness level of the materials at these tempera-tures. Stanyl High Flow materials are less sensi-tive to shear heating and need different settingsduring injection molding.

For more information on processing with Stanylvisit www.dsmep.com.

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Figure 30 Spiral flow versus tensile strength.

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