| HS Code | 356195 |
| Density | 1.22 g/cm³ |
| Tensile Strength | 48 MPa |
| Tensile Modulus | 2.6 GPa |
| Elongation At Break | 30% |
| Flexural Strength | 65 MPa |
| Flexural Modulus | 2.3 GPa |
| Charpy Notched Impact Strength | 5.0 kJ/m² |
| Rockwell Hardness | R115 |
| Heat Deflection Temperature At 1 82 Mpa | 85 °C |
| Heat Deflection Temperature At 0 45 Mpa | 145 °C |
| Melting Point | 178 °C |
| Water Absorption 24h | 1.5% |
| Volume Resistivity | 10^4 ohm·cm |
| Surface Resistivity | 10^5 ohm/sq |
As an accredited ALM PA 820-MF CN Nylon 11, Mineral Fiber Reinforced factory, we enforce strict quality protocols—every batch undergoes rigorous testing to ensure consistent efficacy and safety standards.
| Packing | Supplied in 25 kg net bags: moisture-proof polyethylene liner inside laminated paper bag, palletized and stretch-wrapped for protection. |
| Container Loading (20′ FCL) | 20′ FCL container loading of ALM PA 820-MF CN Nylon 11, mineral fiber reinforced, ensures secure, efficient transport with proper packaging and weight distribution. |
| Shipping | Ship as non-hazardous polyamide 11 powder, mineral fiber reinforced. Pack in sealed, moisture-proof containers to protect from humidity. Avoid extreme heat, open flames, and static ignition. Keep upright and dry during transit. Handle with care to prevent bag damage and product contamination. |
| Storage | Store in a cool, dry, well-ventilated area away from direct sunlight, heat sources, and ignition hazards. Keep the original sealed container to prevent moisture absorption and contamination. Maintain moderate temperatures (below 50°C) to avoid deformation. Ensure good ventilation to prevent accumulation of dust or fumes. Protect from mechanical damage and sharp objects. |
| Shelf Life | Store sealed in a cool, dry place. Shelf life is 12 months from the date of manufacture. |
In diesel return-line quick connectors, ALM PA 820-MF CN is specified because the mineral fiber raises hoop stiffness at the sealing barb while retaining PA11’s resistance to Diesel B7 and return-flow pulsation fatigue. Tooling validation is performed against ISO 20860-1 and SAE J2044 male/female envelope dimensions, with an added production check that filler orientation does not shrink the snap-fit arm below its minimum engagement depth. The compound contains a supplier-controlled mineral fiber fraction, commonly in the 10–20 wt% range for strength and flow balance; the exact loading for each lot is confirmed by ash content to ISO 3451-1 from the certificate of analysis. Drying is a hard control point: a dew-point dryer with -40°C air is held at 80°C for 4–6 h, and pellet moisture is tested to ISO 15512 until it remains below 0.08%. Higher moisture produces screw-tip viscosity loss and silver streaks on the thread ramp. Injection is performed on a 3-zone reciprocating screw with L/D 20:1 and compression ratio 2.2:1, barrel profile 210/235/245°C, nozzle 250°C, and oil-circulated mold temperature 60–80°C. Hold pressure is set at 80–120 MPa and maintained until gate freeze, because early release lets mineral particles rebound and creates sink at the O-ring groove face. Weld lines around the core pin are the most common production-line failure mode: short mineral fiber restricts knit-line elongation, so gate position is moved to force the weld line into a non-pressurized side boss. Diesel immersion is run per ISO 1817 for 500 h at 70°C, then tensile properties are retested to ISO 527-2:2012. When OEM limits for elongation retention are not met, productions are corrected by raising mold temperature or adding a post-mold anneal at 100°C for 2 h under nitrogen.
Push-in fittings for commercial-vehicle air brake circuits are validated under SAE J2494-3 because service loading is not static pressure but combined vibration, pressure pulse, and thermal cycling from -40°C to 85°C. The mineral fiber in ALM PA 820-MF CN raises resistance to grab-ring indentation under ISO 2039-1 and slows creep of the tube support shoulder under ISO 899-1, but the design limit remains compressed-air leakage at the brass grab ring after thermal aging. Fittings are molded with oil-heated tools at 70–85°C and a valve-gated hot runner drop to prevent cold slugs at the inlet. Running the tool below 50°C forms a resin-rich skin over the mineral core that can micro-delaminate during thread tapping or the SAE J2494-3 vibration block. Minimum wall thickness at the tube support is not a catalog value; it is derived from burst testing at 1.2 MPa after 72 h at 100°C in air. Threaded preforms are checked for fiber agglomeration at the thread root by light-section microscopy because the mineral filler migrates toward the laminate surface under high shear. Final leak testing is performed at -40°C after a 24 h cold soak and again at 85°C after 1 h stabilisation. Because the glass transition of PA11 is near 45°C, the upper-temperature leakage test must be reported with relative humidity; absorbed moisture plasticizes the matrix and can shift the apparent leak threshold if the conditioning sequence is not locked.
| Application | Standard code | Method / condition |
|---|---|---|
| Diesel return-line connectors | ISO 20860-1, SAE J2044 | Dimensional envelope, Diesel B7 immersion at 70°C for 500 h, tensile retest to ISO 527-2:2012 |
| Air brake push-in fittings | SAE J2494-3 | Indentation to ISO 2039-1, creep to ISO 899-1 at 60°C |
| EV coolant distribution manifolds | ISO 16750-4 | Tensile and flexural retests after 1,000 h in 50:50 water/glycol at 95°C |
| Downhole ESP centralizer bushings | NACE MR0175 / ISO 15156 | Sour service exposure, hydrocarbon aging to ISO 23936-2 |
| Compressed-air valve bodies | ISO 8573-5 | Lot-to-lot melt flow rate to ISO 1133-1:2022 |
| Water meter housings | ISO 4064-2:2014 | NSF/ANSI/CAN 61 confirmation on production tool |
In EV coolant distribution units operating at 1.2–1.6 barg, mineral-reinforced PA11 is preferred for hose nipples, manifold flanges, and degas chamber bosses where creep under clamp load and hydrolysis are simultaneous. The filler raises flexural modulus and allows the sealing bead to maintain surface pressure after 1,000 h in 50:50 water/ethylene glycol at 95°C; specimens are tested to ISO 178:2019 for flexural modulus and ISO 527-2:2012 for tensile strength after immersion, but published data for this exact grade under automotive coolant ageing is limited and must be generated for PPAP submission. Multiple gates create knit lines across the nipple base; manufacturers use sequential valve-gate sequencing or a single direct hot-tip gate because mineral fibers align parallel to flow and produce anisotropic shrinkage measured to ISO 294-4. Flow-axis shrinkage commonly differs from transverse shrinkage by more than 30% in short-fiber semicrystalline compounds; actual values for ALM PA 820-MF CN are taken from supplier mold-flow data before tool steel is cut. Hot runner manifold temperature is held at 255°C, and total material residence time is kept below 8 min to avoid thermal degradation at the hot tip. Final parts include coolant hose nipples, degas bottle adapters, cooling plate connectors, and mounting flanges; all sealing surfaces are inspected for mineral fiber read-through because surface roughness at the nipple bead can create a weep path under thermal cycling.
Electrical submersible pump centralizer bushings and thrust rings operate in produced water, hydrocarbon, H2S, and CO2 at bottomhole temperatures up to 90°C. ALM PA 820-MF CN is selected where PPS is too brittle during installation and unfilled PA11 wears too quickly against steel shafts. The mineral filler raises the unlubricated sliding PV limit and reduces wear rate against 316L shaft surfaces, but the material must be evaluated to NACE MR0175/ISO 15156 for sour service and to ISO 23936-2 for long-term hydrocarbon aging. Molding is performed on a 4-zone screw with barrier mixing, melt temperature 240–260°C, and mold temperature 60–90°C; rapid cooling below 50°C produces low crystallinity and reduces compression strength after downhole conditioning. Bushings are annealed at 120°C for 4 h in a nitrogen-purged oven to stabilize the crystalline fraction before machining. Field failure modes include swelling after methanol squeeze treatments and acidizing fluids; the compound is not recommended for continuous exposure to formic acid or hot concentrated sulfuric acid. Parts are inspected for voids by CT scan at 0.1 mm voxel resolution because internal porosity acts as an H2S blister initiation site.
Compressed-air valve bodies and rail brake panel fittings require dimensional stability after moisture uptake; PA11 absorbs less water than PA6 or PA66, and the mineral fiber reduces linear expansion so the spool bore remains within clearance after 40°C/80% RH conditioning per ISO 62:2008. The spool bore is machined after molding from a blank with 1.2 mm stock because the mineral fiber makes the surface more abrasive to cutting tools; cutting speed is limited to 250 m/min with tungsten carbide or PCD. Before machining, blanks are annealed at 100–120°C for 2 h to complete crystallization and relieve molded-in stress. Post-machining leakage is tested at 10 bar air pressure, with the acceptance threshold set by the valve original equipment manufacturer. Tools are ventilated at the end of flow path at 0.015–0.03 mm depth because mineral-filled PA11 traps volatiles that char at the cavity boundary. Published machinability data for this exact mineral-reinforced PA11 grade is limited; tool wear and bore roundness are tracked during PPAP runs before series production.
Mineral-reinforced PA11 is used for water meter chambers and transducer housings where low creep under clamp load and low water absorption maintain metering accuracy. The grade is evaluated for cold potable water contact within the meter assembly to ISO 4064-2:2014; certification to NSF/ANSI/CAN 61 for the molded formulation is product-specific and must be reconfirmed on the production tool because color masterbatch, process lubricants, and regrind level can affect extraction test results. Molding uses pre-drying at 80°C for 6 h to below 0.08% moisture, melt temperature 235–255°C, and mold temperature 60–80°C. Tooling is ventilated at 0.015–0.03 mm depth to release gas from the mineral filler and prevent charred outlets at the last-filled meter boss. Threaded insert retention is checked after 1,000 h at 60°C in water to ISO 899-1; the test is used because the failure mode is not immediate pull-out but delayed thread relaxation. Production lots are rejected if ash content varies by more than ±2 wt% from the approved PPAP value because mineral content variation shifts the clamp-load decay curve and alters water meter calibration at the threaded coupling.
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ALM PA 820-MF CN is a mineral fiber reinforced polyamide 11 powder supplied as a laser powder-bed fusion feedstock. The matrix is poly(11-aminoundecanoic acid); the filler is a mineral fiber rather than glass or carbon fiber. The CN field is vendor-specific and should not be interpreted as a generic chemistry code. The product is specified through powder particle size distribution, filler content, melt flow index, and fused-specimen mechanical properties. Typical test methods used for lot certification include ASTM D638 for tensile properties, ASTM D790 for flexural modulus, ASTM D648 for heat deflection temperature, ISO 1133-1 for melt flow rate, ISO 11357-3 for melting and crystallization transitions, and ISO 3451-4 for filler content. The material is used in additive manufacturing of components that require higher modulus and lower creep than unfilled polyamide 11 while retaining the lower density and chemical resistance of the C11 backbone.
Moisture control is a boundary condition for this powder. The material is conditioned in a vacuum dryer or desiccant bed at 80–90 °C until moisture content falls below 0.1 wt% as measured by Karl Fischer titration according to ISO 15512. Powder exposed to ambient relative humidity above 60% for more than several hours should be re-dried before loading into the build chamber, because residual moisture increases laser spatter, surface porosity, and melt-pool instability.
Manufacturer certificates for this grade typically separate incoming powder characteristics from fused-part mechanical properties. Powder characteristics include bulk density, tapped density, particle size distribution by laser diffraction under ISO 13320-1, and filler content by loss on ignition under ISO 3451-4 or thermogravimetry under ISO 11358-1. Fused-part density for mineral-filled polyamide 11 powders is generally reported within 1.15–1.25 g/cm³ when measured by ISO 1183-1. The density elevation relative to unfilled polyamide 11 is due to the mineral filler and is accompanied by a measurable increase in tensile modulus. Tensile modulus for this class of powder is commonly in the range of 1800–2400 MPa, tensile strength in the range of 35–45 MPa, and elongation at break in the range of 5–12% when tested at 23 °C under ASTM D638.
Flexural modulus values under ASTM D790 are commonly 1700–2300 MPa. Heat deflection temperature at 0.45 MPa is reported in the range of 140–165 °C; the 1.82 MPa heat deflection temperature is lower because the fiber-matrix interphase and amorphous regions soften under increased stress. These ranges are representative of mineral-filled polyamide 11 powder-bed fusion materials and are not lot-specific certificates for ALM PA 820-MF CN. The manufacturer’s grade-specific datasheet and certificate of analysis remain the controlling documents for part qualification.
Melt rheology of mineral-filled polyamide 11 is characterized by melt flow index under ISO 1133-1, but parallel-plate oscillatory rheology at 190–200 °C provides a more informative view of the sintering behavior. The filler raises storage modulus in the melt and reduces the terminal slope of the complex viscosity curve. This shear-thinning behavior is relevant in laser sintering because the melt pool is formed under near-zero shear; the filled grade therefore requires higher laser energy density to overcome the higher low-shear viscosity. Incoming powder with an unexpected reduction in melt flow index often indicates moisture, oxidative degradation, or contamination with fine particulate.
| Property | Test standard | Unfilled PA 11 powder | Mineral fiber PA 11 powder | Glass-filled PA 12 powder |
|---|---|---|---|---|
| Fused-part density | ISO 1183-1 | 1.03–1.06 g/cm³ | 1.15–1.25 g/cm³ | 1.22–1.28 g/cm³ |
| Tensile modulus | ASTM D638 | 1400–1700 MPa | 1800–2400 MPa | 2400–3200 MPa |
| Elongation at break | ASTM D638 | 20–50% | 5–12% | 3–8% |
| Heat deflection temperature at 0.45 MPa | ASTM D648 | 135–150 °C | 140–165 °C | 150–175 °C |
| Linear XY shrinkage | Internal build calibration | 2.2–3.0% | 1.5–2.0% | 1.4–1.8% |
Table values are representative industrial ranges for powder-bed fusion polyamide materials and are not lot-specific certificates for ALM PA 820-MF CN. Dimensional stability is controlled by the mineral fiber through a reduction in linear shrinkage. Unfilled PA 11 powder typically shrinks 2.2–3.0% in XY and 2.8–3.5% in Z after powder-bed fusion; mineral-filled PA 11 powders typically reduce XY shrinkage to 1.5–2.0% and Z shrinkage to 2.0–2.6% under identical laser energy density. These values are machine-dependent and require calibration artifacts for critical dimensions.
On production-scale powder-bed fusion equipment, mineral-filled polyamide 11 requires higher energy density than unfilled polyamide 11 because the filler increases melt viscosity and reduces particle coalescence. Equipment technical bulletins for laser powder-bed fusion systems with 30–70 W CO₂ lasers describe a starting energy density adjustment of 5–15% relative to unfilled polyamide 11, but specific settings for ALM PA 820-MF CN are machine-dependent and should be established through design-of-experiment builds. The build chamber temperature is maintained within 5–10 °C below the melting onset measured by ISO 11357-3. This condition reduces edge curl while avoiding premature coalescence of unexposed powder in the feed zone.
Layer thickness for mineral-filled polyamide 11 is typically set at 100–120 µm. Layers below 100 µm increase the risk of short feed and fiber bridging across the recoater gap, while layers above 120 µm reduce Z-axis resolution and require deeper laser penetration. The mineral fiber also causes higher recoater blade wear than unfilled powder; production maintenance logs show shorter inspection intervals for recoater blades and powder inlet contact surfaces.
The functional difference between ALM PA 820-MF CN and glass-filled PA 12 grades begins with filler morphology. Mineral fiber has lower hardness than glass fiber, so it generates less abrasion in recoater systems and hopper liners. Glass-filled PA 12 powders generally produce higher tensile modulus but create stronger anisotropy because the fibers align in the build plane. Mineral fiber reinforcement provides a more balanced XY and Z mechanical response at the cost of lower absolute modulus. The polyamide 11 matrix also has a melting point approximately 10–15 °C higher than PA 12, which improves short-term thermal dimensional stability but narrows the sintering window.
Compared with unfilled PA 11, the mineral-filled product shifts failure mode from ductile yielding to earlier fracture. Elongation at break falls from 20–50% for unfilled PA 11 powder to 5–12% for the filled grade. This shift is acceptable for brackets, housings, and fixture bodies but not for snap-fit elements or impact-loaded clips. The mineral fiber increases tensile modulus and reduces creep under constant load, which benefits bolted joints and vibration fixtures. When a part requires repeated flexure or high strain recovery, unfilled PA 11 or a lower-modulus polyamide remains the more predictable choice.
The mineral fiber morphology is not constant across multiple build cycles. Recycled powder from open-bed systems often shows reduced fiber aspect ratio because brittle mineral fibers fracture during recoating, mixing, and pneumatic transfer. This reduction in aspect ratio lowers the reinforcing efficiency of the recycled fraction and produces a measurable decrease in tensile modulus after repeated cycles. A common production practice is to blend recycled powder with virgin powder at 30–50 wt% recycled for large builds; lower recycled fractions are used when Z-axis elongation is part of the acceptance criteria. The optimum blend is determined by tracking melt flow index under ISO 1133-1 after 3–5 reuse cycles, not by visual appearance alone.
Particle size distribution also shifts with reuse because fine fragments and short mineral fibers accumulate in the hopper. Recuperation sieving with a 125 µm or 150 µm mesh removes agglomerates, but fine particle carryover can increase surface roughness. A virgin powder refresh fraction of at least 50 wt% is a conservative starting point for applications requiring elongation at break above 8%. Lower refresh fractions may still meet tensile strength limits but can fail Z-oriented elongation requirements in thick sections.
If the build chamber is too cold relative to the melting onset, the sintered layer contracts before the next layer is fused, producing upward curl at part edges and a deviation in effective layer height. On systems with an IR pyrometer and heated feed powder, a temperature deviation of 3–5 °C below the setpoint is sufficient to cause edge lift in large flat parts. If the chamber is too hot, unexposed powder becomes partially tacky; this reduces the recovered powder fraction that can be reintroduced into the feed stream and can produce part growth in the Z axis.
Thermal oxidation during extended builds is another boundary condition. In an inert atmosphere with oxygen below 1%, the polyamide 11 backbone remains processable through multiple build cycles. Exposure to oxygen above this level at build temperature causes yellowing, a decrease in melt flow index, and a reduction in elongation at break. Oxidation onset measured by ISO 11357-6 is therefore part of incoming powder quality control for long builds, although published data for this specific configuration are limited. Nitrogen purity of at least 99.9% is a common inert-gas specification for polyamide powder-bed fusion systems.
| Regulation/Standard | Designation | Applicability to ALM PA 820-MF CN |
|---|---|---|
| REACH registration | EC 1907/2006 | Registration required for monomer, filler, and additives in EU supply |
| RoHS restricted substances | 2011/65/EU Annex II | Cadmium, lead, mercury, hexavalent chromium, PBBs, and PBDEs must be below threshold in homogeneous material |
| Food contact base polymer | FDA 21 CFR 177.1500 | Polyamide 11 may comply as a base polymer; filled grade requires end-use migration testing |
| Flammability | ASTM D635, ISO 3795 | Must be evaluated on fused parts, not raw powder |
| Moisture content | ISO 15512 | Accepted powder-bed fusion limit is usually below 0.1 wt% |
The mineral-filled grade is applied in powder-bed fusion manufacturing of chemical-resistant air ducts, fluid reservoirs, jigs, brackets, and low-moisture housings. For hydrocarbon exposure, polyamide 11 is evaluated by immersion testing under ISO 175; typical screening conditions are 500 h at 60 °C in representative aliphatic hydrocarbon or engine oil fluids. The mineral fiber component reduces dimensional change during these exposures by lowering the mobility of the polyamide matrix. The product is not recommended for continuous service in strong acids, oxidizing media, high-pressure steam, or aqueous chloride solutions at elevated temperature, because hydrolysis of the amide linkage proceeds at rates that depend on temperature and pH. Direct food contact requires part-specific testing under FDA 21 CFR 177.1500 because the mineral fiber and powder-bed fusion process residues may fall outside the base polymer clearance.
Electrical and electronic applications require verification of heavy metal content under 2011/65/EU Annex II and flammability under ASTM D635 or ISO 3795 on fused specimens. For design validation, the Z-axis tensile data should be generated at the same layer thickness and recycle ratio intended for production; XY-only datasheet values do not adequately predict performance in vertically built load-bearing sections.
