| HS Code | 109350 |
| Density | 1.34 g/cm³ |
| Tensile Strength | 51 MPa |
| Tensile Modulus | 8700 MPa |
| Elongation At Break | 2.5% |
| Flexural Strength | 89 MPa |
| Flexural Modulus | 7200 MPa |
| Impact Strength Izod Notched | 43 J/m |
| Heat Deflection Temperature 0 45 Mpa | 177 °C |
| Heat Deflection Temperature 1 82 Mpa | 126 °C |
| Melting Point | 185 °C |
| Water Absorption | 0.4% |
| Glass Content | 40% |
As an accredited ALM PA-616-GS Filled Nylon 12 Prototyping Polymer factory, we enforce strict quality protocols—every batch undergoes rigorous testing to ensure consistent efficacy and safety standards.
| Packing | Supplied in sealed, moisture-resistant containers to preserve quality. Quantity: 1 kg per bottle, ideal for prototyping applications. |
| Container Loading (20′ FCL) | 20′ FCL: one full 20-foot container of ALM PA-616-GS Filled Nylon 12 Prototyping Polymer, securely packed for shipment. |
| Shipping | ALM PA-616-GS is a nylon 12 prototyping polymer powder, shipped as non-hazardous industrial material. Packed in sealed, moisture-proof containers to prevent clumping. Avoid dust inhalation and ignition sources; store dry, cool, and away from oxidizers. Standard ground or freight shipping, with proper labeling. |
| Storage | Store ALM PA-616-GS in an airtight, resealable container with desiccant, in a cool, dry, well-ventilated area away from sunlight, heat, and ignition sources. Keep the polymer sealed when not in use to prevent moisture absorption, which degrades print quality. Avoid contact with strong oxidizers. Use within recommended shelf life. |
| Shelf Life | Store sealed in original container, away from moisture and heat. Shelf life is 12 months from date of manufacture. |
In underhood thermal cycling work, unfilled polyamide 12 prototypes frequently fall outside the deflection envelope required for charge-air path mockups, but the glass bead dispersion in ALM PA-616-GS raises the storage modulus and suppresses the long-range shrinkage that causes sealing flange warpage. The glass bead fraction in as-supplied glass-filled PA 12 laser-sintering powders typically occupies the 25–30 wt% range; the ALM PA-616-GS lot certificate should be read before altering laser parameters, because a two-point shift in bead loading changes melt pool thermal conductivity enough to widen or close the interlayer fusion window. Thermal validation for underhood prototype exposure is commonly performed against ISO 16750-4 Section 5.3.1 temperature cycle profiles rather than long-term heat aging, while mechanical property acceptance is recorded from specimens tested per ISO 527-2 and ISO 75-2. The powder addition strategy for first-article builds uses 100% as-delivered PA-616-GS; after the first overflow pass through a 150 µm test sieve, subsequent builds adopt a virgin-to-reclaimed ratio of 70/30 by mass, with the reclaimed fraction dried at 80 °C for 6 h when ambient relative humidity exceeds 60%. The powder should not be dry-blended with unfilled PA 12 or external glass frit; the melt viscosities diverge and produce intra-layer delamination at the interface between filled and unfilled regions. The downstream production process is CO2 laser powder bed fusion at a chamber setpoint of 175 °C, layer thickness 0.10 mm, fill laser power 42 W, outline power 8 W, and scan spacing 0.27 mm on a system equipped with a counter-rotating recoater running at 80 mm/s; this specific combination avoids the recoater streak defect that appears when glass bead enrichment in the overflow fraction exceeds 5%. The terminal article is an engine bay air intake snorkel prototype used for fit-and-function checks on a turbocharged gasoline engine program.
Automotive trim assembly cells replace machined acetal jig plates with laser-sintered ALM PA-616-GS when the contour-scanning fixture must survive repeated clamping against decorative door panels without marring the cover stock. The tolerance class for non-mating surfaces is ISO 2768-1 Class m, while fixture calibration records are held under ISO 9001:2015; load-deflection calculations for cantilever clamp sections use tensile modulus values obtained by ISO 527-2 and heat deflection temperature values from ISO 75-2. The powder addition ratio is 80/20 virgin-to-reclaimed by mass, because raising reclaimed content above 20% in this material class progressively enriches the fines fraction with glass bead fragments, and the resulting thermal conductivity gradient across the powder bed alters local melt densification. The build process uses 0.12 mm layer thickness, a chamber setpoint of 178 °C, fill laser power 48 W, and outline laser power reduced to 8 W to limit edge over-sintering; parts are held in the build envelope until the bed temperature drops below 60 °C to prevent thermal shock curl. Build chamber relative humidity is controlled below 50% because powder bridging in the hopper reduces layer density and produces flatness errors on the jig locating face. After extraction, the jig plates are dry-media blasted at 0.4 MPa with 150–180 µm glass beads, and critical locating edges are hand-scraped to remove the residual semi-sintered layer. The terminal products are alignment fixtures and inspection templates for door trim assembly, with beam lengths up to 300 mm; published flatness data for this specific glass-filled configuration are limited, so first-piece CMM inspection is used to lock the global scaling factors for each lot.
For pneumatic distribution prototypes operating below 0.8 MPa at 20–50 °C, the glass bead fraction in PA-616-GS reduces creep under continuous clamp load compared with unfilled PA 12, but the layer interfaces and residual surface porosity remain a leak-path risk unless the downstream treatment is matched to the fitting type. Chemical inventory compliance is assessed under REACH and RoHS 2011/65/EU Annex II; threaded interfaces for push-to-connect fittings are checked against ISO 228-1 G-series gauges, while tensile creep data from ISO 527-2 and ISO 899-1 support boss deflection calculations. The powder formulation remains 100% as-delivered PA-616-GS for leak-critical hollow bodies because mixed reclaimed lots can carry degraded glass-polymer interfacial adhesion that raises microcrack density around blind thread roots. The production process is a 0.10 mm layer thickness CO2 laser build at a bed temperature of 174 °C, fill laser power 44 W, and scan spacing 0.25 mm, followed by parting-line removal, low-pressure abrasive blasting, and the application of a low-viscosity anaerobic sealant rated for PA 12 substrates; the sealant cures inside blind thread roots where oxygen is excluded, but coat-out on exposed surfaces must be avoided because the cured film changes insertion torque. Steam vapor smoothing is not recommended for threaded bosses because the process removes material from thread crests and can expand the effective clearance beyond the fitting manufacturer limit. The terminal article is a pneumatic distribution manifold prototype for a robotic welding cell air supply; published burst-test data for this specific glass bead filled nylon 12 configuration are limited, so each lot requires a shop-floor proof test at 1.5× the intended operating pressure.
Aerospace full-scale cabin interior mockups require large contoured panels that combine low mass, stiff thin-wall sections, and the ability to accept film adhesives during later decorative lamination. Because the mockup is not a production cabin component, 14 CFR 25.853(a) vertical burn data are generated on witness specimens from the same build lot for screening, but the material is not qualified as a service cabin material; mechanical property verification follows ISO 527-2 and ISO 75-2 on flat tensile coupons extracted from the panel and from the center of the build envelope. The build powder is maintained at a 70/30 virgin-to-reclaimed ratio after sieving through a 150 µm aperture, and overflow is discarded if visible carbonized specks are present, because glass bead clusters that pass through the recoater produce surface craters on the large contiguous upper face. The downstream production sequence uses a large-frame CO2 laser powder bed fusion machine at 0.12 mm layer thickness, a bed temperature of 176 °C, and fill laser power not exceeding 50 W to prevent local glass bead devitrification at thin-section overhangs. At panel sizes exceeding 600 mm, the center of the build envelope cools more slowly than the perimeter; extraction timing should follow the machine manufacturer thermal curve rather than a fixed elapsed-time rule. After the build, panels are abraded with 120-grit aluminium oxide paper, wiped with isopropyl alcohol, and joined with a two-part epoxy film adhesive; threaded inserts are potted into undersized cavities rather than press-fit to avoid radial cracking. The terminal article is a cabin air diffuser mockup assembly used for human-factors evaluation and volumetric validation.
Large flat appliance housing panels expose the shrinkage anisotropy of glass bead–filled PA 12 more clearly than small tensile bars. The filler suppresses in-plane radial shrinkage but does not remove the z-axis consolidation gradient, so first articles are built with a scaling factor of 1.4% in X and Y and 2.2% in Z; these values are revised after coordinate measuring machine inspection against the CAD model, because lot-to-lot changes in bead size distribution shift the shrinkage boundary by up to 0.3%. Compliance for the prototype housing uses UL 94 HB for flammability screening, while the mechanical property certificates reference ISO 527-2, ISO 75-2, and ISO 178 for flexural modulus; electrical safety tests under IEC 62368-1 are applied only if the prototype carries live conductors. The powder blend ratio is 65/35 virgin-to-reclaimed by mass, with the reclaimed fraction screened to 150 µm and conditioned at 80 °C until moisture falls below 0.15%. The process runs on a large-frame CO2 laser powder bed fusion system at 0.12 mm layer thickness and a chamber setpoint of 172 °C; fill laser power is held to 46 W, and the outline pass is disabled on large flat panels to reduce edge bead. The powder bed temperature should not be raised above the prescribed upper limit because localized glass bead de-wetting around bead-rich zones increases surface haze and primer bond variance. After cooling, surface finishing includes solvent wipe and 240-grit sanding before primer adhesion. The terminal article is a refrigerator compressor shroud prototype used for airflow and acoustic screening.
Robotic end-effector tooling fabricated from glass bead–filled PA 12 undergoes cyclic jaw loading that makes the balance between stiffness and impact toughness the dominant design input. For non-safety-critical bin-picking gripper jaws, a 50/50 virgin-to-reclaimed ratio reduces powder cost but lowers the notched impact response compared with a 80/20 blend; the higher virgin fraction is therefore specified for jaws that contact metal transfer plates or hardened locating pins. Compliance references include ISO 10218-1 for industrial robot safety and ISO 12100 for risk assessment, while tensile elongation is measured according to ISO 527-2 and creep recovery according to ISO 899-1; the design acceptance boundary for critical jaws is an elongation at break of not less than 6% to avoid brittle failure at the insert root. Amine-based adhesion promoters in post-applied coatings should be avoided because they plasticize the PA 12 matrix at the insert wall and reduce heat-set insert pull-out force. The build process uses 0.10 mm layer thickness, a chamber setpoint of 176 °C, fill laser power 45 W, and scan spacing 0.27 mm; the gripper jaw bodies are oriented with the screw boss axis vertical to reduce stress risers from layer interfaces. Insert pockets are re-reamed after build to an H7 fit, and brass heat-set inserts are installed at 180 °C with a dwell time of 8 s to consolidate the surrounding polymer without pushing melted material into the workpiece contact face. The terminal article is a two-finger bin-picking gripper jaw set with M5 threaded insert interfaces and a rear bayonet alignment feature.
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ALM PA-616-GS Filled Nylon 12 Prototyping Polymer is a glass-filled polyamide 12 powder formulated for selective laser sintering of functional prototypes, manufacturing aids, and short-run production components. The GS suffix denotes a glass-filled system within the Advanced Laser Materials PA-600 series, in which the reinforcement raises elastic modulus and heat deflection temperature while lowering elongation at break relative to unfilled nylon 12 feedstocks. The powder is consolidated with a CO₂ laser at 10.6 µm wavelength, using layer heights from 0.100 mm to 0.150 mm and a heated nitrogen-inerted bed maintained near the polymer’s crystallization onset to reduce part warpage. Published data for this specific configuration is limited in open academic literature; design decisions should therefore use the manufacturer’s lot-specific certificate of analysis in combination with the standard test methods referenced below.
Thermal control is the primary processing constraint. In SLS systems with build volumes above 350 mm x 350 mm x 400 mm, the powder bed is typically held at a temperature 2–10 °C below the onset of melt, depending on filler loading and absorbed moisture. If the bed temperature drops below the recrystallization window, residual stress formed during laser scanning is not relaxed, producing upward curl at part edges and increasing the probability of recoater collision. Operators of production equipment often set the build platform heater target in 1 °C increments and monitor bed surface temperature with an infrared pyrometer because small thermal gradients across the part bed produce asymmetric shrinkage. For glass-filled nylon 12 grades, the filler raises melt viscosity relative to unfilled systems, which may require a slightly higher build chamber temperature to maintain interlayer coalescence, but exact setpoints must be derived from differential scanning calorimetry traces according to ISO 11357-1:2016 and ISO 11357-3:2018.
Laser energy density is a second boundary condition. Typical volumetric energy density for filled nylon 12 SLS is in the range of 0.08–0.12 J/mm³, calculated from laser power, scan speed, hatch spacing, and layer thickness. When the energy density is too low, interlayer adhesion degrades and tensile specimens fail prematurely at the layer interface; when too high, polymer degradation, excess smoke generation, and surface roughness increase. The addition of glass filler reduces laser absorption depth and can increase surface emissivity, so a higher laser power may be needed relative to unfilled PA 12 on the same machine. On a 30 W CO₂ laser system with a 0.100 mm layer height, operators often scan at 8–12 m/s and adjust hatch spacing to maintain the target energy density. These values are representative of machine settings and must be tuned for the specific optical path and thermal history of the system.
Recoater wear is an operational failure mode observed in glass-filled SLS campaigns. Particle size distribution and particle shape govern the minimum feature resolution and recoating robustness. For comparable glass-filled SLS polyamide 12 powders, D10 values typically range from 20 µm to 30 µm, D50 from 45 µm to 60 µm, and D90 from 80 µm to 110 µm. These distributions support layer thicknesses between 0.100 mm and 0.120 mm while limiting recoater dragging. Hausner ratio values near 1.25–1.35 are commonly observed. The presence of glass filler increases the apparent hardness of individual particles, which can raise recoater blade wear on high-volume production systems. Operators should monitor blade edges and refresh powder at ratios of 30% to 50% virgin material depending on part density and thermal history. A deviation in D50 beyond the supplier’s certified window typically manifests as edge definition loss on thin walls and non-uniform radiant absorption.
Polyamide 12 absorbs moisture from ambient air, and glass-filled grades are not exempt. Pre-drying at 80 °C for 4–6 h in a desiccant dryer or vacuum oven is commonly specified when powder has been exposed to relative humidity above 60% for more than 24 h. The target residual moisture before SLS is below 0.10 wt%; higher values produce visible steam plumes at the laser scan line, increase porosity in the sintered part, and create inconsistent melt pool geometry. Karl Fischer titration according to ISO 15512:2019 should be used for lot acceptance, with the threshold verified against the manufacturer’s certificate. In field use, moisture-related defects concentrate near the top surface of the powder bed because the laser heats the water first, displacing powder particles and producing a rougher surface finish.
Powder refresh and lot blending are not optional in production. Recycled powder from SLS builds undergoes thermo-oxidative aging, which lowers its melt flow index and shifts its crystallization kinetics. A common practice for filled nylon 12 is to maintain a 30–50% virgin material ratio by weight, with the exact ratio set by measuring melt flow rate according to ISO 1133-1:2022 and notched tensile performance after aging. Batch-to-batch variation in filler content or particle size can shift the optimal bed temperature by 1–2 °C, so mixing a new lot with the previous lot without a qualification build is not recommended. Equipment records should include the percentage of recycled powder, the number of thermal cycles, and the measured flow value for each build to prevent a sudden increase in part brittleness.
Glass-filled nylon 12 is used when unfilled nylon 12 prototypes fail stiffness or deflection-temperature requirements. Reinforcement increases the elastic modulus but reduces elongation at break, typically to less than 5% for heavily filled systems. This trade-off appears immediately in standard tensile data: unfilled SLS nylon 12 commonly exhibits elongation at break of 10–30%, while glass-filled grades often fall between 2% and 5% when tested according to ASTM D638-14. Impact resistance may also decline when the part is loaded perpendicular to the build direction. Consequently, glass-filled PA 12 prototypes are less suitable for snap-fit features that require large elastic strain, but are preferred for brackets, housings, and fixture plates where geometric stability under load matters more than elongation.
| Property | Unfilled PA 12 SLS | Glass-Filled PA 12 SLS |
|---|---|---|
| Density (ASTM D792) | 1.00–1.03 g/cm³ | 1.25–1.38 g/cm³ |
| Tensile modulus (ASTM D638-14) | 1500–1800 MPa | 2500–3500 MPa |
| Tensile strength (ASTM D638-14) | 40–50 MPa | 30–45 MPa |
| Elongation at break (ASTM D638-14) | 10–30% | 2–5% |
| Flexural modulus (ASTM D790-17) | 1400–1700 MPa | 2600–3400 MPa |
| Heat deflection temperature at 0.45 MPa (ASTM D648-16) | 150–175 °C | 165–190 °C |
| Notched Izod impact (ASTM D256-10) | 30–50 J/m | 20–40 J/m |
Surface finish and geometric tolerance differ from injection molding. Laser-sintered glass-filled nylon 12 parts typically require media blasting with glass bead or plastic media to remove semi-sintered powder from surfaces. The filler raises the as-built surface roughness because the glass particles protrude from the melt surface, producing an arithmetic mean roughness Ra commonly in the range of 8–15 µm after blasting, compared with 6–12 µm for unfilled PA 12 under similar post-processing. Direct published Ra values for ALM PA-616-GS are limited; the range cited is from comparable glass-filled SLS nylon 12. Dimensional compensation factors must be established for X, Y, and Z directions separately. Filled grades often show reduced overall shrinkage but increased anisotropy because the filler particles do not flow uniformly along the scan path.
Build validation should include a lattice or gauge block artifact with calibrated measurements. On production-scale equipment, the optimal X-Y scaling factor for glass-filled nylon 12 may fall between 0.4% and 1.2%, while the Z-direction factor may require an additional 0.2–0.5% adjustment to account for layer consolidation. These ranges are class-level estimates and must be derived experimentally for each lot and machine combination. Failure to compensate anisotropy on a part with long unsupported spans typically results in bowing, particularly when the part is oriented parallel to the recoater travel direction.
| Standard | Test or Characterization Method |
|---|---|
| ASTM D638-14 | Tensile properties of plastics |
| ASTM D790-17 | Flexural properties of unreinforced and reinforced plastics |
| ASTM D648-16 | Deflection temperature of plastics under flexural load |
| ASTM D256-10 | Izod pendulum impact resistance |
| ISO 527-2:2012 | Tensile properties for molding and extrusion materials |
| ISO 178:2019 | Flexural properties of plastics |
| ISO 1133-1:2022 | Melt mass-flow rate and melt volume-flow rate |
| ISO 15512:2019 | Water content via Karl Fischer titration |
| ISO 11357-3:2018 | Differential scanning calorimetry for melting and crystallization |
Compared with carbon-fiber-filled nylon 12, glass-filled grades generally maintain higher electrical insulation and lower cost, but exhibit higher density and lower modulus improvement per unit filler. Compared with mineral-filled nylon 12, glass-filled systems may offer better repeatability of surface finish but require more aggressive drying and powder blending control. The use of ALM PA-616-GS should therefore be restricted to applications in which stiffness and dimensional stability outweigh ductility, and in which all design properties are verified with test specimens built in the same orientation as the production part. Where a direct substitution from unfilled PA 12 is planned, the reduction in elongation at break and the increase in powder bed temperature setpoints must be incorporated into the process qualification before release.
