| HS Code | 757930 |
| Density | 2.60 g/cm³ |
| Water Absorption 24 Hr | 0.08 % |
| Linear Mold Shrinkage | 0.003-0.007 mm/mm |
| Tensile Strength At Yield | 30.0 MPa |
| Elongation At Break | 1.2 % |
| Tensile Modulus | 6.50 GPa |
| Flexural Modulus | 5.80 GPa |
| Flexural Strength | 45.0 MPa |
| Charpy Impact Notched 23 C | 4.0 kJ/m² |
| Heat Deflection Temperature At 0 45 Mpa | 90.0 °C |
| Heat Deflection Temperature At 1 8 Mpa | 45.0 °C |
| Melting Point | 178.0 °C |
As an accredited Avient Gravi-Tech™ GRV-NJ-110-W Polyamide 12 (Nylon 12) factory, we enforce strict quality protocols—every batch undergoes rigorous testing to ensure consistent efficacy and safety standards.
| Packing | Supplied as 25 kg moisture-resistant bags of Nylon 12 pellets, sealed for safe handling and storage. |
| Container Loading (20′ FCL) | 20′ FCL container: palletized bags of Avient Gravi-Tech™ GRV-NJ-110-W Polyamide 12, securely loaded, maximizing weight capacity safely. |
| Shipping | Avient Gravi-Tech™ GRV-NJ-110-W Polyamide 12 ships as impact-resistant pellets in sealed, moisture-barrier bags or drums. Store in a cool, dry area, away from direct sunlight and humidity. Standard ground or freight transport is suitable; no special hazardous material designation applies. Keep containers closed to prevent moisture absorption and ensure intact, stable packaging throughout transit. |
| Storage | Store Avient Gravi-Tech™ GRV-NJ-110-W Polyamide 12 in its original, sealed container in a cool, dry, well-ventilated area. Protect from direct sunlight, heat sources, and moisture, as nylon 12 absorbs humidity. Maintain moderate temperatures and low humidity to prevent degradation. Keep containers tightly closed when not in use and use within recommended shelf life. |
| Shelf Life | Shelf life is 1 year from date of manufacture when stored in original, unopened packaging in a cool, dry place. |
In nuclear medicine and portable diagnostic X-ray environments where lead removal is a procurement condition under EU Directive 2011/65/EU RoHS recast and REACH Annex XVII entry 63, Gravi-Tech™ GRV-NJ-110-W polyamide 12 is injection molded as a high-density polymer alternative for vial shields, isotope transport caps, and collimator housings. The compound’s nominal specific gravity of 11.0 g/cm³ per ASTM D792-20 provides mass concentration without the assembly and coating steps required for lead sheet, lead-loaded vinyl, or die-cast zinc shielding. In these partially assembled devices, the PA12 matrix contributes low moisture uptake and reduces the dimensional drift observed with PA6 or PA66 matrices after exposure to controlled-area humidity cycles.
Regulatory documentation for radiation-shielding components typically references IEC 61331-1:2014 for attenuation characteristics of protective devices against diagnostic medical X-radiation. When the molded surface is in skin contact for more than 30 days, biocompatibility evaluation follows ISO 10993-5 for cytotoxicity and ISO 10993-23 for irritation. If the component is supplied as a medical device accessory, quality management records are maintained under EN ISO 13485:2016. Attenuation-critical parts also require lot-level density verification because a density shift of 1.5% can alter shielding thickness calculations by an equivalent mass-per-unit-area ratio, particularly when wall thickness falls below 3.0 mm.
At 100 wt% compound, the as-molded density remains at the datasheet value of 11.0 g/cm³ (ASTM D792-20). Volume-additivity calculation for a 90 wt% GRV-NJ-110-W / 10 wt% unfilled PA12 blend of 1.01 g/cm³ yields approximately 5.5 g/cm³; reducing the compound to 70 wt% produces a calculated density near 2.8 g/cm³. These dilution ratios are used only when attenuation is not the primary function. For shielding components, unfilled PA12 let-down is typically limited to 0–5 wt% reprocessed material from the same compound, and only after the regrind density has been revalidated by ASTM D792-20 to prevent non-conforming mass distribution.
| Blend composition | Calculated density | Application window |
|---|---|---|
| 100 wt% GRV-NJ-110-W | 11.0 g/cm³ | Maximum attenuation, syringe shields |
| 90 wt% GRV-NJ-110-W / 10 wt% unfilled PA12 | 5.5 g/cm³ | Reduced-mass shielding housings |
| 70 wt% GRV-NJ-110-W / 30 wt% unfilled PA12 | 2.8 g/cm³ | Non-attenuation dense structural inserts |
Pre-drying is performed in a closed-loop desiccant dryer at 80°C for 4 h to a residual moisture content below 0.10%. Injection molding machines with 18:1 to 20:1 L/D general-purpose screws and bimetallic barrels are specified because the high-density filler package increases screw torque and barrel wear relative to unfilled PA12. Barrel temperatures are held between 230°C and 260°C, mold temperatures from 50°C to 80°C, and fill velocities in the low-to-moderate range reduce melt-front turbulence that would otherwise produce surface flow lines at the filler-matrix interface. Melt residence time above 12 min at the upper barrel setpoint is avoided to limit yellowing and viscosity degradation of the PA12 matrix.
Terminal molded product types include tungsten-filled PA12 syringe shields, 18F-FDG vial transport caps, radioisotope source holder housings, and portable X-ray collimator rings. Wall thickness in these parts commonly ranges from 2.5 mm to 6.0 mm to meet a specified lead-equivalence value while keeping part mass below that of equivalent lead shielding.
Automotive interior programs requiring mass-damped tactile feedback in shift-by-wire selectors, rotary gear selectors, and electronic park-brake levers use Gravi-Tech™ GRV-NJ-110-W because it consolidates a dense counterweight and a chemical-resistant structural carrier into one injection-molded part. Die-cast zinc and lead-free brass inserts historically provide the mass function but introduce separate machining, corrosion protection, and assembly steps. A high-density PA12 compound eliminates those secondary operations while maintaining cabin mass targets and damping low-amplitude vibration at the selector knob interface.
Component compliance for these applications is documented under FMVSS 302 and ISO 3795 for horizontal burn rate, DIN 75201-B for windshield fogging, and VDA 270 for odor. REACH Annex XVII and RoHS 2011/65/EU documentation is generated from IEC 62321-3-1 extraction data. The high-density filler chemistry is listed separately in IMDS submissions when the assembly is supplied to European OEM platforms. Automotive interior material specifications may also require lot-to-lot density control under ASTM D792-20 because a density deviation above 0.8% can change detent feel in shift actuators.
The compound is processed at 100 wt% for maximum density. When a specific knob mass is below the full-density part weight, processors blend the same compound with 10–20 wt% unfilled PA12 of the same viscosity family by gravimetric dosing at the throat. Hand mixing is not used because filler segregation in the feed system causes part-to-part mass variation above 2%. The resulting blend density is verified by ASTM D792-20 on each batch, and the dryer dew point is held at or below −30°C to prevent moisture-induced viscosity shifts in the PA12 matrix.
Production-scale molding on 120–200 t hydraulic or electric toggle presses uses fill speeds of 30–60 mm/s and pack pressures of 50–80 MPa. Tooling requires hardened ejector pins and gate inserts because the retained high-density filler creates sliding wear at the sprue bush and hot-tip gate. Mold temperatures of 60–80°C reduce post-mold sink over thick counterweight sections, while a melt temperature of 250–265°C keeps injection pressure below 120 MPa. Short-shot testing is not used as a standalone process validation method for this grade because density-related flow hesitation at wall-thickness transitions can mask true fill imbalance; screw cushion stability and shot-mass capability studies provide more reliable production data.
Terminal product categories include rotary shift knob counterweights, shift-by-wire lever damper masses, electric park-brake lever dampers, and steering column stalk weights. These parts are typically integrated into assemblies by ultrasonic welding, heat-staking, or snap-fit retention rather than adhesive bonding because the low surface energy of PA12 limits epoxy joint durability.
For lead-free freshwater jig heads and saltwater inshore trolling lure bodies, the specific gravity of Gravi-Tech™ GRV-NJ-110-W allows sink-rate control without lead wire, brass beads, or post-molded metal inserts. The PA12 matrix absorbs less moisture than PA6, reducing the sink-rate drift that occurs when nylon-based lures swell after water exposure. This property is critical in suspending hard baits where the density difference between freshwater and saltwater must be compensated by wall thickness or internal void volume.
Lead-free tackle regulations in the U.S. Northeast and REACH Annex XVII entry 63 restrictions on lead-containing articles make high-density polymer a substitution option in export markets. Finished lure bodies that may be handled by children are tested for heavy-metal migration under EN 71-3:2019+A1:2021, and California Proposition 65 screening for lead and cadmium is documented. RoHS testing per IEC 62321-3-1 confirms the absence of restricted substances when metallic hook shanks and decorative coatings are included in the finished assembly.
For fast-sinking jig heads and saltwater trolling lures, the compound is molded at 100 wt%. For suspending hard baits requiring neutral buoyancy in 4°C freshwater, 4–9 wt% GRV-NJ-110-W is gravimetrically blended into a low-viscosity unfilled PA12 base. The final density is controlled between 1.05 g/cm³ and 1.10 g/cm³ to compensate for saltwater buoyancy differences, with the exact addition ratio established by trial molding two-cavity test plaques and measuring density by ASTM D792-20. This blending approach avoids the density instability caused by air entrapment in manually mixed masterbatch dilutions.
Injection molding of high-density PA12 lures uses melt temperatures of 225–245°C, mold temperatures of 40–60°C, and slow-to-moderate injection velocities to avoid jetting at thin tail sections. Water-circulating mold temperature controllers are preferred over oil units for faster cycle response in multi-cavity lure tooling. Insert-molded hook shanks are preheated to 80°C before placement to reduce sink-line formation around the shank. Pack pressure of 40–60 MPa and gate sealing time of at least 2 s reduce internal voids below 0.5% by volume because void content, rather than polymer density, becomes the dominant source of sink-rate variation in thick sections.
Terminal products include lead-free jig heads overmolded onto stainless steel hooks, weighted soft-plastic harness cores, suspending jerkbait bodies, saltwater trolling lure heads, and downrigger weight shells. The unsupported maximum wall thickness in these parts rarely exceeds 8.0 mm to prevent centerline porosity from density gradients.
Glass-like mass targets in perfume cap and cosmetic jar overclosure programs are met by Gravi-Tech™ GRV-NJ-110-W PA12 without secondary metal inserts or die-cast zinc cores. The PA12 matrix provides resistance to ester-based fragrance oils, ethanol, and plasticizing sunscreen actives that can craze amorphous polymers such as PMMA, SAN, and PC. This stress-cracking resistance is relevant because fragrance oils frequently migrate into the cap interior during vapor-phase contact in accelerated aging tests.
Packaging components exported to the EU are supported by REACH Annex XVII and EU 94/62/EC packaging directive documentation for heavy-metal concentration limits. When brand owners apply decorative metallic lacquer, coating adhesion is validated under ISO 2409 cross-cut testing after 24 h exposure to fragrance oil at 40°C. Cosmetic packaging suppliers also request RoHS compliance via IEC 62321-3-1 because many closures contain metallic-effect coating layers that are tested separately from the polymer substrate.
The compound is injection molded at 100 wt% for maximum density. Color masterbatch addition is limited to 1–2 wt% because higher liquid-carrier masterbatch levels reduce the effective density and can increase mold deposit buildup on polished cavity surfaces. In components overmolded onto a transparent inner collar, the high-density PA12 core can occupy 70–85 wt% of the total shot, with the transparent copolyester or polyamide overmolding layer forming the remainder. The overmolding layer is kept above 0.6 mm to prevent read-through of the dense core under bright packaging display lighting.
Pre-drying at 80°C for 4–5 h to a moisture content below 0.10% is required before processing. Molding with polished, high-gloss cavities and sequential valve-gated hot runners fills the part from the inner wall outward to avoid visible flow hesitation at the thickest cross-section. Melt temperature is held at 240–260°C, mold temperature at 60–80°C, and hold pressure at 50–70 MPa. Family tooling across multiple cap diameters is not recommended because the density of the compound magnifies cavity-to-cavity fill imbalance beyond what conventional runner balancing can compensate; separate cold-runner drops or independent hot-tip control is required.
Terminal products include high-mass perfume cap shells, jar overclosures, lotion pump collars, and compact case lower bases that require a cool tactile response and scratch resistance without metal plating. These parts are decorated by vacuum metallization, UV lacquer coating, or pad printing after a brief solvent wipe to remove surface contamination from mold release.
To distribute mass toward the temple tip without stamped stainless steel inserts, ophthalmic frame manufacturers mold dense core components from Gravi-Tech™ GRV-NJ-110-W inside injection-molded PA12 or transparent polyamide frames. The high-density core eliminates metal inserts that can cause stress whitening at the hinge block and require secondary mechanical fastening. Because the core is fully encapsulated, it does not alter the exterior surface finish or create galvanic contact points at the temple hinge.
Finished ophthalmic frames are evaluated under ISO 12870:2016 for dimensional stability, sweat resistance, and nickel release. Skin-contact safety of the encapsulated core is supported by ISO 10993-10 and ISO 10993-23 testing when the frame is submitted for biocompatibility assessment. EU REACH Annex XVII and RoHS 2011/65/EU documentation apply to the finished frame because the high-density filler contains metallic constituents. Sports and safety frames are additionally certified to EN 166 for impact resistance, which requires the core-to-frame bond line to remain intact after high-velocity projectile testing.
The core is processed at 100 wt% compound. In two-shot molding, the dense core typically represents 8–15 wt% of the finished frame mass, while the outer frame resin is an unfilled transparent or translucent polyamide of the same matrix family to maintain melt-bond strength above 40 MPa in lap-shear testing adapted from ISO 527-2. Dilution of the core compound with 10–20 wt% unfilled PA12 is used only when the frame target mass is below the full-density core mass, and the resulting density is verified by ASTM D792-20.
Two-shot injection molding is conducted with a rotary platen or core-back tool. The core shot is molded first at 250–265°C melt temperature and 60–80°C mold temperature; the outer frame polymer is injected at a mold temperature of 40–60°C to reduce sink over the core. Core surface roughening by plasma or excimer treatment improves mechanical interlock at the interface. Core shift during the second injection is controlled by maintaining core length-to-diameter ratios below 2:1 and by placing the gate tangentially to the core axis. Process validation includes cross-sectioning at the hinge block to confirm concentric core placement because off-center cores alter frame balance and create thin outer walls prone to cracking during temple flexure.
Terminal products include temple counterweight cores for rimless and full-frame designs, hinge reinforcement inserts, and nose-bridge balance components used in sports eyewear, safety frames, and prescription frames. The high-density core is not used in direct skin contact without encapsulation because the filler package may produce surface roughness that requires additional coating.
Active stylus and haptic motor counterweight programs for mobile computing devices use Gravi-Tech™ GRV-NJ-110-W to concentrate mass in small form-factor housings that are overmolded by soft-touch polyamide or TPU. The compound’s density allows stylus barrels to achieve a writing-weight feel comparable to metal-bodied pens without electromagnetic interference from non-ferrous metal cores. In haptic actuator modules, the mass block contributes to the low-frequency vibration amplitude required for alerting functions while reducing assembly complexity relative to sintered tungsten inserts.
Consumer electronics material specifications require IEC 62321-3-1:2013/AMD1:2021 test reports for RoHS 2011/65/EU and EU 2015/863 phthalate restrictions. UL 94 HB at 0.8 mm is commonly reported for the unfilled matrix, while final part-level flammability is determined by the overmolding layer. REACH Annex XVII and IEC 62474 declarable substance lists are maintained for the compound and its metallic filler. Because the high-density filler may affect radio-frequency transparency, the component supplier provides density and filler distribution data when the counterweight is placed within 3 mm of an antenna keep-out zone.
Core sections are molded at 100 wt% compound. In stylus barrel assemblies, the high-density core constitutes 10–20 wt% of the total finished part mass and is overmolded with 10–15 wt% TPU or soft polyamide for grip and impact compliance. In haptic actuator housings, the compound is injection molded as a 100 wt% insert and then overmolded or press-fit into the module carrier. Blend dilution is not used in these components because the target mass is achieved by adjusting core volume, not by reducing compound density.
Desiccant drying at 80°C for 4 h and barrel residence time below 10 min at 235–255°C are required because small shot sizes in multi-cavity stylus tools increase thermal history variance. High-density compounds of this type generate higher screw torque during plastication, so molding cells are configured with 18:1 to 22:1 L/D screws and hardened check rings. Tooling for insert molding uses tapered cores and ejector sleeves rather than standard ejector pins to avoid core cracking from ejection forces. Pack pressure of 60–80 MPa and gate diameters of at least 0.8 mm on cold-runner sub-gates reduce short shots in thin-walled sections below 1.2 mm.
Terminal products include active stylus barrel counterweights, haptic motor mass blocks, gaming controller trigger weights, and wearable band clasp counterweights. These components are post-processed by solvent wipe, pad printing, or laser marking; the high-density filler can reduce laser marking contrast unless a contrasting surface layer is overmolded.
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Avient Gravi-Tech™ GRV-NJ-110-W is a high-specific-gravity thermoplastic compound based on a polyamide 12 (nylon 12) matrix. The grade is supplied in pellet form for injection molding and specialized extrusion operations. The numerical suffix 110 in the grade designation corresponds to a nominal density of 11.0 g/cm³ when measured according to ISO 1183-1:2019. The compound belongs to a family of high-density materials used to concentrate mass in small volumes, replace metallic inserts, provide radiation shielding, and tune vibrational response. Published property data specific to GRV-NJ-110-W are limited; therefore, qualification batches should be tested against the supplier’s current technical datasheet before production release.
The high-density filler phase is dispersed within the PA12 matrix at loadings that approach the practical packing limit for this polymer family. If a tungsten-based filler with a density of 19.25 g/cm³ is assumed as the dispersed phase, a two-phase density calculation indicates that the filler weight fraction must reach approximately 95.8 wt% to raise the compound density from 1.01 g/cm³ to 11.0 g/cm³. The corresponding filler volume fraction is approximately 55 vol%, leaving a reduced but continuous PA12 matrix. This filler network raises melt viscosity, shifts the shear-thinning response, and increases resistance to flow through narrow gates. Compounding is typically carried out on a co-rotating twin-screw extruder with a length-to-diameter ratio of 40:1 or greater; downstream pelletizing requires water-bath temperatures adjusted to prevent brittle fracture of the highly filled strands.
Thermal conductivity of the compound is higher than that of unfilled PA12 because the filler phase conducts heat more efficiently than the polymer matrix. This creates two opposing process effects: thick sections may cool faster due to higher thermal diffusivity, but thin gates and runners may freeze prematurely because the compound no longer carries the low-viscosity thermal mass of neat PA12. Molders should avoid pinpoint gates below 1.0 mm diameter and should use round or trapezoidal runner sections with minimum diameters of 4.0 mm or greater when filling multi-cavity layouts.
Abrasive filler particles accelerate wear on general-purpose nitrided steel screws, barrels, check rings, and mold surfaces. Production experience with this material class indicates that bimetallic barrels, through-hardened screw flights, and hardened gate inserts are required to maintain shot-to-shot consistency beyond short trial runs. Injection molding machines should be sized so that the shot volume does not exceed 60–70% of barrel capacity; excessive barrel residence time encourages filler settling and matrix degradation. Nozzles should use a minimum orifice diameter of 2.0 mm and full-length heated nozzle bodies to prevent freeze-off.
Radiation shielding and medical instrument counterweights are primary application areas for GRV-NJ-110-W. The compound permits a part to be injection molded with a localized mass concentration that would otherwise require secondary machining or lead insert assembly. In x-ray shielding enclosures, attenuation performance derives primarily from the high-density filler; however, published data for the specific half-value layer of GRV-NJ-110-W are limited, and shielding components should be validated under the applicable radiographic standard such as IEC 61331-1:2014 or the relevant institutional acceptance protocol. Unlike lead-based shielding, a PA12-based compound can be molded into complex housings with integrated fastening features, but the high filler loading does not replicate the electrical conductivity or full photon attenuation of lead across all energy ranges.Vibration-damping and mass-optimization applications include sporting goods, inert mass simulators, and hand-held diagnostic devices. The material is selected where a high-density core must be overmolded or mechanically retained. When evaluating GRV-NJ-110-W against zinc die-casting alloys or machined tungsten, the design must account for a tensile elongation at break that falls below 2.0% in high-density PA12 grades; snap-fit or high-strain living hinges are therefore not viable. The material is better suited to rigid housings, encapsulated weights, and compression-loaded spacers.
Pre-drying is mandatory for polyamide 12 compounds, and the high filler loading does not eliminate the need for moisture control. The residual moisture target should be 0.10% by weight or lower before processing. A desiccant hot-air dryer set at 80°C for 4–6 h is the standard starting condition; with relative humidity above 60%, the drying time should be extended toward the upper limit. Melt temperature should be maintained between 240°C and 270°C, measured at the nozzle, and mold temperature should be controlled between 60°C and 90°C. Temperatures above 270°C increase the risk of matrix degradation and create volatiles that can produce surface splay or nozzle drool.
High filler loadings result in a narrow processing window because the compound is less tolerant of prolonged residence time than unfilled PA12. The melt should not be held at upper melt temperatures for more than 10 min when barrel shutdown is required. During interruptions, the barrel temperature should be reduced to 180–200°C or the material purged with a low-viscosity polyamide purging compound. Start-up following shutdown should include a brief purge to remove degraded residues from the check ring and nozzle tip.
| Processing parameter | Recommended range | Basis or equipment note |
|---|---|---|
| Residual moisture | ≤ 0.10% by weight | Desiccant dryer, ISO 15512 or equivalent |
| Drying temperature/time | 80°C, 4–6 h | Closed-loop desiccant hopper dryer |
| Melt temperature | 240–270°C | Nozzle thermocouple |
| Mold temperature | 60–90°C | Water or oil mold temperature control |
| Injection pressure | 70–120 MPa | Hydraulic machine, part dependent |
| Back pressure | 0.3–0.7 MPa | Low to avoid filler separation |
| Screw compression ratio | 1.5:1–2.0:1 | Low-shear general purpose screw |
| Gate dimensions | ≥ 1.0 mm diameter or equivalent | Round or tab gate preferred |
| Property | Test method | Unfilled PA12 baseline | GRV-NJ-110-W class |
|---|---|---|---|
| Density | ISO 1183-1:2019 | 1.01–1.04 g/cm³ | 11.0 g/cm³ |
| Tensile strength at break | ISO 527-2 | 45–55 MPa | 50–60 MPa |
| Flexural modulus | ISO 178 | 1,200–1,500 MPa | 12,000–15,000 MPa |
| Elongation at break | ISO 527-2 | >50% | 0.5–2.0% |
| Mold shrinkage, flow direction | ISO 294-4 | 1.0–1.5% | 0.3–0.6% |
| Thermal conductivity | ISO 22007-2 | 0.23–0.30 W/m·K | 1.0–3.0 W/m·K |
Replacement of lead and machined metallic weights with GRV-NJ-110-W places different constraints on part design. Lead has a density of 11.34 g/cm³; the PA12 compound at 11.0 g/cm³ requires a volume increase of approximately 3% to match the same mass, assuming equivalent geometric placement. This difference is often acceptable when the part envelope allows slight thickening. However, the compound is not electrically conductive, and its surface hardness is lower than that of lead or steel. If the component must also serve as an electrical contact or grounding path, a separate conductive element is required.
Against glass-filled PA12 or unfilled PA12, the density increase is the primary distinction. A typical glass-fiber-reinforced PA12 grade has a density near 1.3 g/cm³; GRV-NJ-110-W is approximately 8.5 times denser. This enables mass concentration in small cavities without increasing part volume. The high-density filler also reduces mold shrinkage to 0.3–0.6%, but it lowers ductility. Linear thermal expansion coefficients are reduced relative to unfilled PA12; design tolerances should still account for the mismatch with metal inserts or mating steel components.
Within the Gravi-Tech family, GRV-NJ-110-W differs from PA6-based high-density grades because PA12 absorbs less moisture than PA6. PA6 at saturation can absorb 9–10% water by mass, while PA12 saturates near 1.5–2.0% when tested under ISO 62 at 23°C in water. The lower moisture uptake gives GRV-NJ-110-W better dimensional stability in humid service, though the high filler content dominates the absolute dimensional change. Compared with TPE-based high-density grades, the PA12 matrix offers higher stiffness and better chemical resistance, but it has lower impact resilience at low temperatures.
Chemical resistance of the PA12 matrix is retained in the compound. The material resists aliphatic hydrocarbons, greases, and salt solutions, which makes it suitable for oilfield downhole weights and marine ballast housings. Exposure to strong acids, oxidizing media, or phenolic solvents can degrade the PA12 matrix. Service temperatures above 120°C in continuous air are not recommended for unfilled nylon 12, and the high filler loading does not improve oxidative stability. For outdoor use, UV stabilization should be specified separately because the natural grade does not contain a weathering package unless ordered in a UV-stabilized variant.
Multi-cavity tools running GRV-NJ-110-W require rebalancing relative to unfilled PA12. The compound freezes more rapidly at the gate, and weld-line strength is lower because the high filler content interrupts polymer chain entanglement. Gate locations should be moved away from load-bearing sections, and the number of gates should be minimized to reduce weld lines. Mold filling studies on injection molding machines with clamp forces of at least 1,000 kN have shown that high-speed injection and a profiled velocity ramp reduce visible flow hesitation marks, but only when the vent depth is maintained at 0.01–0.02 mm and the mold surface is hardened. Published data for GRV-NJ-110-W in hot-runner systems remain limited; if hot runners are required, the manifold should use large-diameter channels and externally heated tips, and the supplier should be consulted for shear-rate limits.Regulatory qualification for food-contact or medical devices must be established by the end user. The PA12 matrix may be assessed under 21 CFR 177.1500 if the specific formulation meets the relevant extraction limits, but the high-density filler prevents automatic food-contact compliance. RoHS lead exemptions and REACH SVHC declarations should be confirmed with Avient’s regulatory affairs data sheet because high-density metallic fillers may contain trace constituents that require disclosure under Regulation (EC) No 1907/2006. End-use validation under the relevant performance standard remains necessary because the compound’s high-density filler network changes failure mode from ductile yielding to brittle fracture.
