| HS Code | 446821 |
| Density | 1.24 g/cm³ |
| Tensile Modulus | 4800 MPa |
| Tensile Strength | 48 MPa |
| Elongation At Break | 8% |
| Flexural Modulus | 4100 MPa |
| Flexural Strength | 70 MPa |
| Izod Impact Notched | 3.5 kJ/m² |
| Heat Deflection Temperature At 0 45 Mpa | 175 °C |
| Heat Deflection Temperature At 1 82 Mpa | 110 °C |
| Melting Point | 184 °C |
As an accredited ALM PA 620-MF Mineral Fiber Filled Nylon 12 SLS Prototyping Polymer factory, we enforce strict quality protocols—every batch undergoes rigorous testing to ensure consistent efficacy and safety standards.
| Packing | Sealed, moisture-resistant foil bag containing 10 kg of ALM PA 620-MF Mineral Fiber Filled Nylon 12 SLS Prototyping Polymer powder. |
| Container Loading (20′ FCL) | One 20-foot FCL container loaded with ALM PA 620-MF Mineral Fiber Filled Nylon 12 SLS Prototyping Polymer, securely packed and documented. |
| Shipping | ALM PA 620-MF Mineral Fiber Filled Nylon 12 powder ships as non-hazardous, non-DG cargo in sealed, moisture-resistant containers. Keep dry, away from ignition sources and oxidizers. Avoid dust inhalation; use grounded equipment. Transport at ambient temperature, protecting from heat/humidity. Standard ground or air freight is acceptable with proper labeling. |
| Storage | Store ALM PA 620-MF in its original, tightly sealed container in a cool, dry, well-ventilated area. Keep away from heat, sparks, open flames, and incompatible materials. Protect from moisture and humidity to prevent degradation. Avoid generating dust; clean spills promptly. Ensure containers are clearly labeled and inaccessible to unauthorized personnel. |
| Shelf Life | Shelf life is 12 months from manufacture date when stored unopened in a cool, dry environment. |
Thermal loading during internal combustion engine validation cycles exposes underhood air intake duct prototypes to soak temperatures between 110 °C and 130 °C for periods exceeding 6 h, while oil mist and ethylene glycol coolant spray create surface chemical exposure not addressed by unfilled polyamide 12 SLS powders. PA 620-MF is processed as a ready-to-use powder with a nominal 25 wt% mineral fiber filler loading; this filler fraction influences heat deflection temperature under ISO 75-2:2013 method B at 0.45 MPa, and the lot-specific value is recorded on the incoming batch certificate. Automotive thermal validation for this class of prototype is conducted to ISO 16750-4:2010 operating temperature and thermal shock profiles, while tensile and flexural property verification follows ASTM D638-14 and ASTM D790-17. The powder bed is prepared off-line with a virgin-to-reclaimed ratio of 70:30 by weight; material recovered from the build is sieved to 150 µm and dried under vacuum at 80 °C for 8 h before reintroduction. If a duct section requires local flexibility at a bellows interface, a dry blend of 50 wt% PA 620-MF with 50 wt% unfilled nylon 12 of the same molecular class is used, but this blend reduces the heat deflection benefit and is not applied to flange sealing faces. Parts are grown at 0.10 mm layer thickness in a CO₂ laser powder bed fusion system operating at 10.6 µm wavelength, with build chamber bed temperature held between 165 °C and 175 °C and laser fill settings adjusted for the lower melt-flow path length created by the mineral fiber. The powder cake is slow-cooled for 8–10 h, after which compressed air at 1.5–2.0 bar and glass bead blasting with 0.2–0.4 mm media at 2.5–3.0 bar remove unsintered powder from internal channels. Terminal prototype parts in this application include air intake duct sections, positive crankcase ventilation separator mockups, resonator bodies, coolant expansion tank covers, and charge air cooler end tanks for form-and-fit validation.
High-temperature electrical connector housings for EV battery management systems and industrial power distribution are prototyped in PA 620-MF when the ambient operating temperature at the connector body exceeds 90 °C and the design requires snap-fit retention after repeated thermal cycling. Compared with unfilled nylon 12 SLS powder, the mineral fiber reinforcement in PA 620-MF reduces edge curl on thin connector walls and increases short-term heat resistance under ASTM D648-18, but it lowers notched impact performance measured by ISO 179-1:2010 Charpy notched specimens; this trade-off is quantified by printing tensile bars to ASTM D638-14 in horizontal and vertical orientations and comparing the vertical-to-horizontal elongation ratio before connector design release. Electrical clearance and creepage tests are conducted according to IEC 60664-1:2020, and flammability documentation for the supplied powder is UL 94 HB; designs requiring V-2 or V-0 classification must use an external halogen-free flame-retardant coating or a different polymer because PA 620-MF is not inherently UL 94 V-0. The powder feed for connector housings uses 80 wt% virgin PA 620-MF and 20 wt% reclaimed material from the same build lot; reclaimed powder is screened to 125 µm and conditioned at 80 °C for 4 h before mixing to prevent moisture-induced surface defects. Parts are printed with 0.10 mm layer thickness, with build orientation set so the snap beam bending axis lies in the X-Y plane to reduce notch sensitivity at the beam root. After extraction, vapor smoothing in a closed cyclohexane vapor system at 40 °C for 20–30 min seals surface porosity and improves the consistency of conformal-coating adhesion. Terminal finished parts in this application include pin and socket connector housings, high-current terminal covers, wire harness retainers, and sensor bodies for pre-compliance electrical testing.
Assembly jigs and dimensional inspection fixtures produced from PA 620-MF are used to locate injection-molded production parts during adhesive bonding, ultrasonic welding, and coordinate measuring machine first-article inspection. The mineral fiber filler reduces overall part shrinkage compared with unfilled SLS nylon 12, but circular bores printed below 10.00 mm diameter still require single-point boring or reaming to achieve H7 fit tolerance under ISO 286-2:2010; as-built hole tolerance from direct SLS is typically insufficient for precision dowel pin retention. Dimensional inspection of the fixture itself follows ISO 10360-2:2009 for CMM measurement, and acceptance protocols for repeatable clamping locations require dynamic repeatability not exceeding 0.15 mm across 100 cycles. Material property verification for fixture plates follows ASTM D638-14 tensile testing and ASTM D790-17 flexural testing, with specimen build orientation parallel to the fixture plate edge. The powder bed for fixture plates larger than 150 mm × 150 mm uses a 65:35 virgin-to-reclaimed powder ratio by weight; reclaimed fraction above 30 wt% is monitored for melt volumetric flow rate under ISO 1133-1:2022 at 235 °C with a 2.16 kg load, but the supplier datasheet remains the primary acceptance source for lot-to-lot flow limits. Parts are printed with 0.10 mm or 0.12 mm layer thickness, and high-load contact surfaces are designed with a solid fill depth of at least 5.0 mm to limit creep under sustained clamping force. After slow cooling, the fixture is post-machined on a three-axis CNC mill using carbide tools at 10,000–14,000 rpm to cut dowel holes, mounting slots, and reference edges. Terminal products include insertion fixtures, CMM holding nests, robotic end-of-arm locators, printed go/no-go gauges, and adhesive-bonding alignment plates.
Flat control panel housings for European domestic appliance prototypes exhibit unacceptable curl when printed in unfilled nylon 12 at build angles exceeding 30° from the X-Y plane; PA 620-MF is therefore selected for short-run usability samples of washing machine detergent drawer fronts and dryer lint filter housings where dimensional flatness under 40 °C steam exposure is the primary acceptance criterion. For these cosmetic outer surfaces, 100 wt% virgin PA 620-MF is used to avoid surface pitting and gloss nonuniformity from recycled powder; structural internal ribs and bosses may be built from a 70:30 virgin-to-reclaimed blend within the same build envelope provided the reclaimed fraction has been sieved to 125 µm and dried at 80 °C for 6 h. Household appliance electrical safety evaluation is performed to IEC 60335-1:2020, and material resistance to detergent solutions and fabric softener residues is assessed according to ISO 175:2010 immersion testing with visual and dimensional checks after 7 days at 60 °C. Flammability documentation remains UL 94 HB; appliance standards that require glow-wire or flame-retardant ratings above the supplied grade must be satisfied by coating or material substitution, not by modifying PA 620-MF with post-hoc additives. The SLS system runs at 0.10 mm layer thickness with a bed temperature profile specific to the mineral-filled polyamide; parts are extracted after slow cooling for 8 h, lightly glass-bead blasted at 2.0 bar with 0.2–0.3 mm media, and then exposed to a 100 °C steam jet for 30 min to relax surface gloss variation and remove residual powder from snap features. Terminal finished outputs include washing machine control panel housings, vacuum cleaner cyclonic separator mockups, refrigerator door handle supports, dryer lint filter bodies, and small appliance motor housing covers for field-installation trials.
Chemical metering pump volute covers and filter end caps produced from PA 620-MF are used in short-run field trials where continuous contact with aliphatic hydrocarbons and glycol-based process fluids at temperatures up to 80 °C is required, but published data for this specific configuration is limited beyond the material supplier’s ISO 175:2010 immersion data for representative fluids. REACH and RoHS Recast 2011/65/EU documentation is supplied with the powder; food-contact, potable-water, and USP Class VI approvals are not assigned to PA 620-MF as delivered. Mechanical integrity after chemical exposure is verified by ASTM D638-14 tensile testing of coupons aged for 7 days at 60 °C in SAE 15W-40 oil and in a 50:50 ethylene glycol–water mixture, with acceptance defined as no more than 15% loss in tensile strength relative to dry-as-built values. The powder feed for pump components uses 75 wt% virgin PA 620-MF with 25 wt% reclaimed powder that has been cycled no more than three times; reclaimed powder is dried under vacuum at 80 °C for 8 h before sieving to 125 µm, and any powder with visible oil contamination from the post-processing area is rejected. Parts are printed at 0.12 mm layer thickness with a high-detail contour offset to preserve lip seal grooves, then sealed using a hot paraffin wax dip at 95 °C for 15 min to reduce porosity in wetted surfaces; tapped holes for threaded connections are post-machined to ISO 228 G-thread geometries. Terminal parts in this application include volute covers, filter end caps, impeller prototypes for non-load-bearing flow visualization, drain plugs, and bypass valve bodies used in chemical metering pump test stands.
Large-format HVAC and industrial air handling manifolds printed in PA 620-MF are used to validate airflow distribution and flange flatness before investment tooling is released. The mineral filler reduces the coefficient of linear thermal expansion compared with unfilled nylon 12, which is advantageous for flanges that must seal against gaskets over a −20 °C to 70 °C operating window. However, outgassing of low-molecular-weight polyamide species during first heat-soak cycles produces a visible film on polycarbonate sight windows in duct assemblies; this is a known limitation of mineral-filled polyamide SLS systems and is not indicative of polymer degradation. Compliance for duct prototypes is project-dependent; internal specification screening commonly uses UL 94 HB and ASTM D648-18 heat deflection temperature at 0.45 MPa, while airflow validation of duct friction loss follows ASHRAE 120-2017. The large-part powder feed holds the reclaimed fraction at 50 wt% to control powder cost, but each 100 kg lot is homogenized in a tumble mixer for 30 min and conditioned to below 0.1% moisture by weight under vacuum at 80 °C before loading; moisture above that threshold causes intermittent steam pores at the part surface and increases the reject rate in pressure-decay testing. SLS builds are performed at 0.12 mm layer thickness on a large-frame CO₂ laser powder bed system with a build volume of 340 × 340 × 600 mm, with slow cooling in the powder cake for 12 h to reduce flange bow. After extraction, surfaces are blasted with crushed walnut shell media at 1.5 bar to remove powder without excessive abrasion, and flange sealing faces are hand-scraped and sealed with cyanoacrylate to close open porosity before installation on airflow test rigs. Terminal products include HVAC duct manifold prototypes, industrial extraction nozzles, air diffusers, laboratory fume hood duct fittings, and cleanroom return-air plenum mockups.
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ALM PA 620-MF is a mineral fiber filled nylon 12 SLS prototyping polymer that occupies an intermediate performance position between unfilled polyamide 12 and glass-filled polyamide 12. The material is specified where unfilled PA 12 lacks the flexural modulus and dimensional flatness required for load-bearing prototypes and where glass-filled grades introduce excessive density, equipment abrasion, or cost. The product designation combines the PA 620 matrix and the MF fiber reinforcement; the mineral fiber remains as a discontinuous filler in the fused polymer after laser melting. Sintered parts are typically built with layer thicknesses between 0.1 mm and 0.12 mm under a CO₂ laser, with the part bed temperature maintained at approximately 172–178 °C and the uncured powder removed after a controlled cool-down cycle. Typical sintered part density is 1.25–1.30 g/cm³; the mineral filler increases bulk density relative to unfilled PA 12 and decreases the elongation at break. Current supplier datasheets should be consulted for exact lot-specific values.
The mineral fiber reinforcement, dispersed in the polyamide 12 matrix, restricts chain motion and raises the heat deflection temperature of the fused part. Under ASTM D638-14 Type I testing, the XY-direction tensile modulus of PA 620-MF is generally reported in the 2800–3800 MPa range, while the tensile strength is in the 40–50 MPa range. The elongation at break drops to 3–6% because the mineral fiber initiates a more brittle fracture mode. Flexural modulus data under ASTM D790-17 typically falls between 2700 MPa and 3500 MPa. The polyamide 12 matrix retains its lower moisture uptake relative to PA 6 and PA 66; nevertheless, moisture conditioning under ISO 1110 can reduce tensile modulus by 5–15% relative to dry-as-built values. The filler also raises melt viscosity during powder coalescence, which improves layer-to-layer flatness but requires careful selection of laser energy density.
The reinforcing phase creates measurable anisotropy. In the XY orientation, tensile properties are affected by the raster pattern and laser scan vector; in the Z orientation, the tensile strength is governed by layer-to-layer fusion rather than fiber orientation. Values for Z-direction tensile strength of PA 620-MF may be 10–30% lower than XY values under ASTM D638-14, depending on scan strategy and part wall thickness. This behavior is not unique to PA 620-MF, but the stiffness gap between filled and unfilled grades narrows in the Z direction because interlayer fracture paths pass through the matrix rather than through the fibers. Designers should avoid using XY properties for thin vertical sections unless Z-direction coupons have been tested.
| Property | Test method | PA 620-MF | Unfilled PA 12 |
|---|---|---|---|
| Tensile strength, XY | ASTM D638-14 | 40–50 MPa | 42–48 MPa |
| Tensile modulus, XY | ASTM D638-14 | 2800–3800 MPa | 1500–1900 MPa |
| Elongation at break, XY | ASTM D638-14 | 3–6% | 12–20% |
| Flexural modulus, XY | ASTM D790-17 | 2700–3500 MPa | 1300–1600 MPa |
| Heat deflection temperature, 0.45 MPa | ASTM D648-16 | 165–180 °C | 145–155 °C |
| Heat deflection temperature, 1.82 MPa | ASTM D648-16 | 85–100 °C | 45–55 °C |
| Notched Izod impact | ASTM D256-23 | 20–40 J/m | 40–60 J/m |
| Sintered density | ASTM D792-20 | 1.25–1.30 g/cm³ | 1.00–1.05 g/cm³ |
During build parameter qualification on production laser sintering systems, PA 620-MF requires a slightly higher laser energy density than unfilled PA 12 because the mineral fiber increases the effective melt viscosity and reduces the thermal penetration depth of the powder bed. Recoat blade condition is a practical process limit: worn or contaminated recoater blades produce streaking and density variations that are visible as surface roughness and reduced Z-direction strength. On platforms such as the EOS P 396 with a 70 W CO₂ laser, the powder is generally processed at a scan speed in the 6–12 m/s range, with laser power and scan spacing adjusted to produce a targeted energy density between 0.03 J/mm² and 0.06 J/mm². The refresh ratio for virgin powder is commonly held at 30–50%; when the ratio falls below 20% or when powder is stored in humid air, tensile elongation and impact resistance decline. The powder should be dried at 80 °C for 4–6 h if the moisture content exceeds 0.1%, because retained moisture creates porosity and steam-induced defects during laser fusion.
Lot-to-lot variance in mineral fiber distribution is a known limitation. When changing powder lots, the same laser power and scan speed may produce deviations in flexural modulus of 5–10% and in tensile elongation of 1–2 percentage points if the fiber content or particle size distribution shifts. In-process verification therefore requires a standardized test coupon placed in the same build position for every production lot. The coupon should be built in the XY, YZ, and ZX orientations to capture anisotropy. Data from production-scale machines show that failure modes in wet powder include porosity, rough side walls, and local part growth; these defects are not corrected by post-process polishing.
Unfilled PA 12 grades, including ALM PA 650 or equivalent, provide higher elongation and lower density but exhibit lower flexural modulus and lower heat deflection temperature under load. PA 620-MF raises stiffness and reduces creep under short-term loads, but the reduction in elongation at break removes living hinge and snap-fit arm suitability. Glass-filled PA 12 systems typically offer higher flexural modulus and HDT than mineral-filled grades, yet they increase recoater blade wear and may produce a higher part density. The mineral fiber in PA 620-MF is less abrasive than glass fiber, which reduces maintenance on metering rollers and re-coater assemblies during multi-lot production runs. In dimensional metrology and assembly fixture applications, PA 620-MF is selected when the part must remain flat and dimensionally stable through moderate temperature changes but does not require the upper stiffness threshold of glass-filled systems. Published data for the exact fiber loading and fiber aspect ratio in PA 620-MF is limited; the supplier’s datasheet and lot certification should govern procurement decisions.
From a supply chain standpoint, PA 620-MF is generally stocked in the same powder packaging as other ALM nylon grades, but the mineral filler changes the bulk density and flow behavior. The powder flows less readily than unfilled PA 12, so hopper and re-coater settings may require adjustment. Unlike glass-filled grades, the mineral filler does not produce the same degree of re-coater blade scoring; this is a practical benefit when the machine is shared across multiple material types. However, the reduced abrasiveness also indicates that the upper stiffness limit is lower than glass-filled nylon 12.
For parts exposed to humid air or water, PA 620-MF requires post-build conditioning before mechanical testing. Nylon 12 absorbs less water than PA 6 and PA 66, but the mineral filler does not eliminate moisture-related property shifts. Conditioning at 50% RH and 23 °C to equilibrium reduces tensile modulus and increases strain at break relative to dry-as-built values. Validation programs should test according to ISO 1110 or ASTM D570-22, not only with dry specimens, because production parts often operate at ambient humidity. The powder should not be blended with unfilled PA 12, PA 11, or glass-filled powders without re-qualification, because particle size distribution and melt flow differences create segregation in the feed bed. In engine bay assembly fixtures that experience air temperatures of 80–100 °C, the higher heat deflection temperature of PA 620-MF relative to unfilled PA 12 is an advantage, but continuous service above 120 °C in constrained geometries is not recommended unless validated under actual load and environment.
Long-span parts built from unfilled PA 12 may exhibit measurable out-of-plane deformation after cooling and moisture conditioning. PA 620-MF reduces the coefficient of linear thermal expansion relative to unfilled PA 12, which lowers the magnitude of post-build warpage in flat brackets, enclosures, and fixture plates. Flatness measurements on similar mineral-filled polyamide 12 powder-bed components are generally reported in the 0.2–0.5 mm per 100 mm span range for thick sections, but exact values are geometry-dependent and should be established on the target build platform. The mineral filler also improves creep resistance below the heat deflection temperature; short-term creep tests under ASTM D2990-17 show that reinforced grades deflect less than unfilled PA 12 under identical load. The trade-off is a more brittle failure mode: if the part contains thin wall sections or sharp internal corners, crack initiation may occur earlier than in unfilled PA 12. For such features, finite element analysis combined with physical bend or impact tests under ASTM D790-17 or ASTM D256-23 is required.
Surface finish and post-processing behavior differ from unfilled nylon 12. The mineral filler increases surface roughness after bead blasting and can produce a more matte appearance after dyeing. Dimensional accuracy is maintained by controlled cooling of the build cake; removing parts from a hot chamber or accelerating cooling may increase warpage. Storage conditions require sealed containers at 20–25 °C and ≤60% RH. Once opened, powder should be re-dried if the moisture content exceeds 0.1%, as measured by a Karl Fischer titrator. The product is not recommended for direct food-contact articles unless validated under FDA 21 CFR 177.1500 or applicable regional standards. No volatile organic compounds are intentionally added, but users must follow the safety data sheet for local extraction and respiratory protective equipment during powder handling. The material should not be mixed with carbon-fiber-filled nylon 12 or other filled powders because the differences in filler type and particle size will cause segregation and inconsistent mechanical properties.
Quality control for PA 620-MF should include sieve analysis of the powder, melt flow rate testing of the virgin polymer, and tensile coupons from each build. The powder’s particle size distribution influences resolution and surface finish; the mineral fiber can increase surface roughness relative to unfilled PA 12 after dyeing or bead blasting. The material is sold as a prototyping polymer; production-quantity part performance should be qualified through a formal process capability study on the specific laser sintering machine.
