| HS Code | 232453 |
| Productname | Arkema Rilsan Fine Powders ES NAT PA11 |
| Material | Polyamide 11 (PA11) |
| Color | Natural |
| Density | 1.04 g/cm³ |
| Meltingpoint | 186 °C |
| Particlesize | D50 50 µm |
| Bulkdensity | 0.45 g/cm³ |
| Tensilestrength | 48 MPa |
| Elongationatbreak | 250% |
| Shorehardness | 72 Shore D |
| Waterabsorption | 1.2% (24h at 23°C) |
| Impactstrength | 70 kJ/m² (Charpy) |
| Dielectricstrength | 16 kV/mm |
As an accredited Arkema Rilsan Fine Powders ES NAT PA11 factory, we enforce strict quality protocols—every batch undergoes rigorous testing to ensure consistent efficacy and safety standards.
| Packing | Packaged in 25 kg multilayer paper bags with polyethylene liner, protecting Arkema Rilsan ES NAT PA11 fine powder from moisture and contamination. |
| Container Loading (20′ FCL) | 20′ FCL loading: Arkema Rilsan Fine Powders ES NAT PA11 in sealed bags on pallets, secured for safe transport. |
| Shipping | Arkema Rilsan Fine Powders ES NAT PA11 ships as a fine, moisture-sensitive polymer powder. Pack in sealed, anti-static containers to prevent dust accumulation and contamination. Transport dry, away from ignition sources and incompatible materials, with proper labeling for safe handling and regulatory compliance. |
| Storage | Store in a cool, dry, well-ventilated area away from direct sunlight, heat, and ignition sources. Keep the original container tightly sealed to prevent moisture absorption and contamination. Avoid dust accumulation and static discharge. Under these conditions, shelf life is typically two years from the date of manufacture. |
| Shelf Life | Shelf life is typically 2 years from production when stored unopened, cool, and dry in original packaging. |
Rilsan Fine Powders ES NAT PA11 is supplied as a natural-color micronized polyamide 11 powder with a melting range of 184–190 °C measured by differential scanning calorimetry according to ISO 11357-3:2018, and a density reference of 1.04 g/cm³ according to ISO 1183-1:2019. In architectural polyester powder coatings, the material is introduced as a dry-blend additive at 2.0–8.0 wt% on total dry formulation; the 3.0–5.0 wt% band is the narrow working zone in which the cured film shifts from high-gloss values toward the 25–50 GU low-gloss range at 60° geometry while retaining the rapid-deformation and scratch-resistance requirements of Qualicoat Class 1 and EN 12206-1:2021. Exterior architectural finishes must also satisfy AAMA 2605-22 or Qualicoat 14th edition requirements for accelerated weathering, humidity resistance, and South Florida exposure. The downstream process uses a high-speed dry-blend mixer to combine the polyamide 11 powder with carboxy-functional polyester resin, beta-hydroxyalkylamide or triglycidyl isocyanurate hardener, pigment, and flow-agent preblend, followed by melt compounding in a co-rotating twin-screw extruder with L/D 40:1; barrel zone set points are held between 90 °C and 110 °C, and screw speed is maintained at 250–400 rpm so that the polyamide 11 particles remain substantially discrete rather than becoming dispersed into the polyester melt. If barrel temperatures exceed 160 °C, the additive softens prematurely, causing melt-pressure oscillations at the die, increased chiller roll pickup, and batch-to-batch variance in surface texture. The chilled extrudate is flaked and then milled in an air classifier mill with milling air inlet below 40 °C and classifier speed adjusted to keep the powder within the electrostatic application window. Final powder is applied to extruded aluminum curtain-wall profiles, window mullions, and façade panel sections by corona or tribo electrostatic guns at film builds of 60–90 µm, then cured at 180–200 °C for 10–15 min. During cure, the polyamide 11 particles may soften and fuse at the surface into low-gloss texture domains; peak metal temperatures below 170 °C produce incomplete texture development. Published data for this exact grade in individual polyester systems is limited; lot-specific verification under ISO 2813:2014, ISO 1518-1:2019, and ISO 6272-2:2011 is required before specification.
| Film property | Reference method | Inspection condition | Unit |
|---|---|---|---|
| Gloss at 60° | ISO 2813:2014 | Film build 60–90 µm | GU |
| Scratch resistance | ISO 1518-1:2019 | Stylus tip 0.5 mm, constant load ramp | N |
| Rapid deformation | ISO 6272-2:2011 | Indenter diameter 20 mm | kg·cm |
| Pencil hardness | ASTM D3363-22 | Gouge hardness | Pencil grade |
In anhydrous color cosmetic dispersions, micronized polyamide 11 functions as a spherulitic slip modifier, soft-focus agent, and sebum-absorption reducer when added at 0.5–5.0 wt% in pressed powders and 0.2–2.0 wt% in hot-pour stick products. Regulatory status for the European Union is governed by EC No 1223/2009; the material is listed under the INCI designation Nylon-11, and manufacturing hygiene must follow ISO 22716:2007 with microbiological limits verified according to ISO 17516:2014. In a hot-pour lipstick line, the wax and oil phase is heated to 80–85 °C in a jacketed kettle with counter-rotating scraped-surface agitation, while the pigment phase is dispersed separately through a three-roll mill with roller gaps set between 15 µm and 30 µm; the polyamide 11 powder is pre-wetted with an emollient ester and introduced after pigment letdown at a process temperature below 100 °C to avoid particle deformation. The batch is then passed through a vacuum deaeration step at −0.08 MPa and filled into molds or componentry at 75–80 °C. For pressed powders, the powder is blended in a ribbon mixer with mica, silica, and binder esters, then compressed in an automatic press at compaction force between 30 kN and 80 kN depending on pan diameter. Finished product types include loose powders, pressed powder compacts, hot-pour lipsticks, and anhydrous foundation sticks. Addition above 5.0 wt% tends to increase dry drag and visible whitecast in high-pigment anhydrous systems, defining the upper operational boundary. Powder properties should be verified by laser diffraction per ISO 13320:2020 and powder flowability by USP General Chapter 1174 or equivalent as part of incoming quality control.
In polyester and polyurethane coil coating formulations, Rilsan Fine Powders ES NAT PA11 is introduced at 1.0–3.0 wt% on total liquid coating as a partial replacement for silica matting agents in single-coat systems and primers for exterior building components. Coil-coated metal is inspected under EN 13523-2:2014 for gloss, EN 13523-4:2014 for pencil hardness, and EN 13523-6:2020 for adhesion after indentation; exterior lines additionally verify condensation resistance under ISO 6270-1:2018. The downstream process runs through a roll coater with a pick-up roll and applicator roll, followed by an oven with peak metal temperature of 210–240 °C and line speed of 20–60 m/min. Because the polyamide 11 melting range overlaps the oven thermal profile, the powder particles are not retained as solid dispersed phase but instead fuse and deform during crosslinking; final film roughness is therefore controlled by cooling-quench conditions and back-up roll pressure as much as by the original additive particle size. Pre-dispersion of the additive in a separate mill base with a high-speed dissolver at 5–8 m/s tip speed is required before letdown, because direct post-add incorporation without shear can result in filter-press pressure rise and non-uniform gloss across the coil width. Terminal products include metal cladding panels, appliance housings, and garage door slats. Addition above 3.0 wt% can raise low-shear viscosity and reduce flow-out, especially in high-solids polyurethane topcoats; this is the principal formulation limitation in coil applications.
Modification of scuff resistance in UV-curable overprint varnishes on folded carton board uses a low-dose particulate additive that remains below the coating surface and does not generate visible haze in uncoated crease areas. In this application, Rilsan Fine Powders ES NAT PA11 is added at 0.5–2.5 wt% on total varnish mass; the regulatory path for packaging inks and overprint varnishes includes EU 94/62/EC and Swiss Ordinance 817.023.21 where brand-owner specifications require migration limits and verification of printing inks for indirect food contact. The production sequence involves a high-speed dissolver with a toothed disc at 800–1500 rpm in the oligomer-monomer premix, followed by final letdown and filtration through a 25 µm bag or cartridge filter. High-shear bead milling of the polyamide 11 additive is avoided because it narrows the particle size distribution and reduces the surface texturing contribution. Rub resistance is assessed on a Sutherland rub tester according to ASTM D5264-98(2019), and static coefficient of friction is measured according to ASTM D1894-24. Terminal goods include cosmetic cartons, beverage multipacks, and pharmaceutical folding cartons where scuff-free barcode areas and unprinted creases are required. Above 2.5 wt%, the risk of pinholing in low-coat-weight UV varnishes increases on non-absorbent film-laminated board; the upper addition limit is therefore determined by print trial rather than by simple viscosity adjustment.
The addition of Rilsan Fine Powders ES NAT PA11 to two-component polyurethane topcoats at 1.0–4.0 wt% on total wet paint provides surface slip and dry-film scratch resistance in coatings where silicone-based slip additives are restricted because of recoatability or electronic assembly requirements. Protective performance is specified by ISO 12944-6:2018 for C3/C4 atmospheric corrosivity, with Taber abrasion measured by ASTM D4060-19 using CS-17 wheels under 1000 g load, pencil hardness by ASTM D3363-22, and scratch resistance by ISO 1518-1:2019. The powder is pre-dried at 80 °C for 4 h when ambient storage relative humidity exceeds 60%, because absorbed moisture can introduce microfoaming during crosslinking with aliphatic polyisocyanate hardeners. The production process loads the additive into the post-grind letdown phase using a high-speed disperser at 5–8 m/s tip speed, followed by filtration through a 30 µm mesh; addition before the pigment grind is avoided because prolonged high shear disrupts the controlled powder size distribution and may reduce the slip effect. Application is by conventional or HVLP spray at dry-film thicknesses of 60–120 µm, with forced cure at 70–80 °C for 30–45 min. Terminal finished products include machine tool housings, laboratory furniture, and metal electrical enclosures. The operational boundary is the incompatibility of high-humidity films with unreacted isocyanate; if water content is not controlled, surface defects become visible as microcraters under 20× magnification before the hardness specification is reached.
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Arkema Rilsan Fine Powders ES NAT PA11 is a natural-colour, castor-oil-derived polyamide 11 micropowder supplied as a free-flowing powder. The grade belongs to the Rilsan Fine Powders range and is differentiated by a fine particle-size distribution; the D50 determined by laser diffraction under ISO 13320-1 is typically in the 15–25 µm band, with the D90 controlled below 50 µm to limit surface defects in thin films. The crystalline melting peak determined by differential scanning calorimetry under ISO 11357-3 is reported at 183–186 °C. Density at 23 °C measured by ISO 1183-1 is 1.04 g/cm³, and bulk density measured by ISO 60 falls in the 0.35–0.45 g/cm³ range. Because the polymer is polyamide 11 rather than polyamide 6 or polyamide 66, the longer methylene sequence between amide groups produces comparatively lower equilibrium water absorption; the powder nevertheless requires moisture control in formulations sensitive to free water.
| Parameter | Test method | Typical range |
|---|---|---|
| Melting peak | ISO 11357-3 | 183–186 °C |
| Density at 23 °C | ISO 1183-1 | 1.03–1.05 g/cm³ |
| Particle size D50 | ISO 13320-1 | 15–25 µm |
| Particle size D90 | ISO 13320-1 | 35–50 µm |
| Bulk density | ISO 60 | 0.35–0.45 g/cm³ |
| Oil absorption | ISO 787-5 | 50–70 g/100 g |
| Residual moisture | ISO 15512-1 | <0.2 wt% |
In production-scale powder handling, the primary failure mode is hopper bridging caused by cohesive interparticle forces at low bulk density. Feeders with agitating hoppers, vibratory troughs, or line surfaces with a roughness below 0.8 µm Ra are specified. A single-screw volumetric feeder at screw speeds below 20 min⁻¹ can produce mass-flow oscillation because the fine powder lacks the particle inertia of the coarser D-series products; a 30 mm open-flight auger with an agitator paddle has been found to maintain feed uniformity in cosmetic pressing lines, whereas a 20 mm closed-flight auger without agitation produced short-term deviations of ±5 wt%. Residual moisture above 0.2 wt% measured by ISO 15512-1 also increases agglomerate formation during high-shear dispersion; pre-drying at 60–70 °C for a minimum of 4 h is specified when ambient relative humidity exceeds 60 %.
The dispersion behaviour is governed by oil absorption and the interaction between particle top-size and film thickness. Oil absorption measured by ISO 787-5 is typically in the 50–70 g/100 g range. In a low-solids polyester-melamine binder system, addition of the powder at 5–15 wt% on binder solids increases the low-shear viscosity only moderately until the free binder fraction is depleted; beyond that point, the wet mass develops a yield stress. In a pilot-scale dissolver with a rotor tip speed of 12 m/s, the torque curve can rise by a factor of 2–3 when the addition level exceeds 10 wt% and the binder-to-powder ratio falls below 1.5:1. Published shear-viscosity curves for this specific configuration are limited, so 12 m/s pilot validation is required before full production. For coil-coating topcoats, the dry-film thickness should exceed the D90; a top-coat below 20 µm can expose particles with a D90 above 35 µm, producing micro-protrusions detectable by profilometry.
In color cosmetics, the powder is used as a texturizing and skin-feel modifier in loose and pressed powders. It is post-added after pigment dispersion and before pressing. On an automatic rotary press with 12–20 kN compaction force and 50 mm round tooling, the addition of 5 wt% PA11 reduces ejection force by 10–15 % compared with talc at identical loading; the effect is attributed to lower particle-particle friction at the compact tool wall. In anhydrous emulsions and lip products, the powder is incorporated at 1–5 wt% to impart a drier, powdery after-feel without the high oil absorption of porous silica. Published data for the ES NAT grade in water-based systems are limited; because the powder is hydrophobic, a nonionic wetting agent at 0.5–1.0 wt% on powder weight is required to achieve wetting in an aqueous slurry. The powder is not recommended for use with strong oxidising acids or chlorinated solvents at elevated temperature because PA11 can degrade by acid-catalysed amide hydrolysis.
When the formulation is transferred from a D-series PA11 grade, the smaller top-cut of ES NAT changes both the surface area and the optical opacity of the compact. D-series products with a D50 greater than 30 µm provide lower surface-area-dependent oil demand; ES NAT at a D50 of 15–25 µm can increase oil uptake by 5–15 g/100 g, requiring a reduction in the emollient fraction of 2–5 wt% to maintain the same powder flow and press hardness. The finer grade also reduces the grittiness failure mode in pressed eye shadows, but this benefit must be balanced against a higher tendency to form dry agglomerates. Compared with a PA12 micropowder of equivalent particle size, PA11 exhibits a melting peak approximately 6 °C higher, which can be processed through heated calendering without particle fusion under the same temperature set points. The renewable carbon fraction of Rilsan PA11 is above 98 % when measured by ASTM D6866-21, whereas conventional PA12 is petrochemical-derived unless a specific bio-content declaration is available.
For powder-coating lines operating at peak metal temperatures between 190 °C and 210 °C, the ES NAT grade is generally not used as the sole film-forming powder because its fine particle size and high surface area reduce fluidization consistency. The product is instead used as a functional additive. In a fluidized-bed coating line with an air velocity of 1–3 cm/s, the fine powder can elutriate; electrostatic spray application with a 30–50 kV corona gun and a transport air setting of 1–2 m³/h is therefore preferred. Under these settings the powder deposits onto grounded substrates with a transfer efficiency that is influenced by particle charge-to-mass ratio; published data for this specific configuration is limited, and coating trials should be run with a 1 mm thick aluminium panel to determine edge coverage and deposition uniformity.
For cosmetic and food-contact evaluation, compliance must be confirmed for the final formulation. The polyamide 11 base polymer can be evaluated against FDA 21 CFR 177.1500 for food-contact applications; however, the fine powder physical form, any milling aids, and surface treatments must be reviewed separately against the intended contact conditions. Under RoHS Directive 2011/65/EU, lead, cadmium, mercury, hexavalent chromium, PBB, and PBDE are below the specified homogeneous-material thresholds. Storage stability is limited by thermo-oxidative degradation: long-term storage above 30 °C or exposure to ultraviolet light can shift the yellowness index and increase the viscosity of the molten polymer during heated processing. Because the powder contains no volatile solvents, VOC contribution in coating formulations is limited to the carrier system; the powder itself is not classified as a volatile organic compound under Directive 2004/42/EC for decorative coatings, but classification should be verified in the final product.
