| HS Code | 138044 |
| Melting Point | 186°C |
| Glass Transition Temperature | 45°C |
| True Density | 1.02 g/cm³ |
| Apparent Density | 0.70 g/cm³ |
| Average Particle Size D50 | 50 µm |
| Tensile Modulus | 1600 MPa |
| Tensile Strength At Yield | 44 MPa |
| Elongation At Break | 30% |
| Charpy Impact Strength Notched | 4.5 kJ/m² |
| Shore D Hardness | 75 |
| Water Absorption 24h | 1.2% |
| Heat Deflection Temperature A | 52°C |
As an accredited Arkema Rilsan Fine Powders ES NAT MAC PA11 factory, we enforce strict quality protocols—every batch undergoes rigorous testing to ensure consistent efficacy and safety standards.
| Packing | Supplied in 25 kg sealed multi-layer paper bags with polyethylene liner, protecting the PA11 powder from moisture and contamination. |
| Container Loading (20′ FCL) | 20′ FCL container loading of Arkema Rilsan Fine Powders ES NAT MAC PA11 requires secure, dry, moisture-protected packing to prevent damage. |
| Shipping | Arkema Rilsan Fine Powders ES NAT MAC PA11 is a polyamide 11 powder shipped in sealed, moisture-protective packaging. It is generally non-hazardous for transport, but handled as a combustible dust. Keep dry, cool, and away from ignition sources. Use grounded equipment and avoid static discharge during handling. |
| Storage | Store Rilsan Fine Powders ES NAT MAC PA11 in its original, tightly sealed container in a cool, dry, well-ventilated area away from direct sunlight, heat sources, and ignition sources. Keep the container closed when not in use to prevent moisture absorption, which can affect powder flow and coating performance. Ideal storage temperature: below 25°C with moderate humidity. |
| Shelf Life | Shelf life is typically two years from production when stored cool, dry, and sealed in original packaging. |
Zinc-nickel electroplated double-wall steel brake tubing with a 12–15 µm electroplate layer is processed through an alkaline degrease, rinse, zinc phosphating or tricationic phosphate conversion coating and final deionized rinse before preheating to 250–280°C. Fluidized bed dip application of Arkema Rilsan Fine Powders ES NAT MAC PA11 builds a fused film of 180–260 µm as measured by ISO 2808 Method 6 on magnetic steel. The residual heat from the tube mass maintains the melt above 185°C for 60–120 s; tubes with wall thickness below 0.7 mm may require an additional infrared dwell because heat drains too quickly to complete levelling. Adhesion is assessed after 24 h conditioning at 23°C and 50% RH using ISO 4624 pull-off with 20 mm dollies; cohesive failure within the PA11 layer above 12 MPa is accepted when interfacial attack is absent. Scribe corrosion resistance is validated through OEM cyclic tests such as SAE J2334 or VDA 233-102 rather than static salt mist; the coating must remain free of red rust at the scribe for the duration specified on the engineering drawing. The upper melt temperature must not exceed 300°C for thin-wall tube because oxidation of the zinc-nickel intermetallic layer reduces adhesive strength.
Welded carbon steel wire racks from 3.0–4.5 mm rod are degreased, shot blasted to ISO 8501-1 Sa 2½, phosphated and preheated to 320–360°C before fluidized bed dip. Fusion produces a film of 250–450 µm, but drainage at wire intersections reduces local thickness below 200 µm; this junction governs impact failure in service. Acceptance testing per ISO 6272-1 with a 2 kg weight and 12.7 mm hemispherical punch at -20°C records first crack impact energy; commercial dishwasher rack specifications often require no cracking below 18 J. Detergent cycling at 95°C in a 0.2% caustic cleaning solution followed by cold shock at -20°C is repeated for 1,000 cycles and evaluated for loss of adhesion by ISO 2409 cross-cut. The natural resin in ES NAT MAC has no pigment to mask interfacial cracks, so visual inspection under 10x magnification is used to detect craze networks before cross-cut testing. Where oven recovery is slow, a separate post-fusion hold at 180–200°C for 20–30 min reduces pinhole density in weld pockets.
Chromium-free conversion coated 6063-T6 aluminium profiles for interior architectural trim and lighting housings are preheated to 220–260°C and coated by electrostatic spray with ES NAT MAC PA11. Film build of 200–350 µm is maintained to avoid electrostatic edge wipe at sharp extrusion corners. The natural grade shows limited exterior UV resistance; in direct outdoor exposure, chalking and gloss reduction under ISO 16474-2 accelerate beyond 1,000 h, so the product is confined to indoor or fully sheltered service unless a pigmented PA11 or fluoropolymer topcoat is applied. Adhesion on aluminium is evaluated by ISO 2409 cross-cut; class 0 is achievable on chromium-free conversion layers when the conversion coat weight is 0.6–1.2 g/m² for zirconium/titanium systems. After 500 h water immersion at 40°C per ISO 2812-2, adhesion drop to class 1 indicates hydrated aluminium oxide formation at the interface; this is a controlled failure mode rather than coating degradation.
Cast steel and ductile iron pump volutes are degreased, pre-baked at 180–200°C for 2 h to remove absorbed hydrocarbons, blasted to SSPC-SP 10/NACE No. 2 with 2–4 mm angular steel grit, and preheated to 290–320°C. Arkema Rilsan Fine Powders ES NAT MAC PA11 is applied by electrostatic spray or fluidized bed to an internal film thickness of 350–600 µm. The thermoplastic nature of PA11 eliminates crosslinking cure; film properties develop during coalescence and solidification, so the limiting process variable is the time above 185°C. Methanol and 50% aqueous ethylene glycol exposure at 60°C for 56 days per ISO 2812-1 is used to assess chemical resistance; dimensional change and mass uptake are recorded. Threaded connection areas are masked to keep film thickness below 100 µm to prevent interference and torque relaxation; high-temperature silicone plugs withstand the preheat cycle. Pull-off adhesion after chemical conditioning per ISO 4624 is specified on a coupon basis because cast iron surface roughness and graphite flake orientation produce local variation that exceeds the scatter of the test method itself.
Lamellar graphite cast iron releases water vapour, absorbed oil residues and thermal decomposition products when heated. At substrate temperatures above 330°C, ES NAT MAC begins fusing before the gas evolution front has ended; bubbles remain trapped at the metal-coating boundary and fail during the first wet corrosion cycle. Isothermal outgassing per ASTM E595 at 300°C for 24 h on a representative casting sample is a useful screening method, though component mass and section thickness alter the time-temperature profile. Metallographic cross-sections after blasting are examined for interconnected porosity reaching the machined surface; if porosity is present, the preheat temperature is reduced to 270–290°C and the part is held longer to allow complete film levelling without excessive gas pressure. Primers for these substrates are limited to solvent-borne epoxy systems that are fully cured before powder application; moisture-cured primers generate CO₂ during the fusion cycle and produce the same blistering defect. This boundary is the primary production control in cast iron coating lines and is checked by daily isothermal trials on scrap castings before the first production batch.
Tinned copper bus bar sections are masked with high-temperature tape, preheated to 210–240°C, and dipped in a fluidized bed of ES NAT MAC PA11 to deposit a 300–500 µm dielectric layer; complex edges may require a second dip after a brief reheat. Unfilled PA11 has a dielectric strength measured per IEC 60243-1 at 23°C in oil with a 500 V/s ramp typically in the 15–20 kV/mm range; the useful insulation limit is set by pinhole density and film thickness at sharp corners rather than bulk polymer breakdown. Volume resistivity exceeds 10^14 Ω·m per IEC 62631-3-1; however, surface contamination from finger salts reduces the practical withstand voltage, so glove handling and pre-cleaning with isopropanol are mandatory. For safety-critical insulation, a high-potential test at 1.5 times the rated voltage is applied for 60 s after 24 h water immersion at 23°C to detect capillary paths through the coating. Dye penetration per ASTM E1417 is used to locate pinholes not visible on the natural translucent film.
| Test scope | Standard / method | Reported condition |
|---|---|---|
| Dry film thickness on magnetic steel | ISO 2808 Method 6 | 180–600 µm depending on part class |
| Pull-off adhesion | ISO 4624 | 20 mm dolly diameter; report failure mode |
| Impact resistance | ISO 6272-1 | 2 kg, 12.7 mm punch, -20°C for wire goods |
| Salt mist corrosion | ISO 9227 NSS | Scribe evaluation per ISO 4628-8 |
| Chemical immersion | ISO 2812-1 | 56 days at 60°C in test fluid |
| Dielectric strength | IEC 60243-1 | 500 V/s ramp, 23°C oil |
| Thermogravimetric outgassing | ASTM E595 | Isothermal 300°C, 24 h, post-vacuum |
Coated pipe fittings and valve components intended for potable water service are evaluated under EN 12873-1 migration testing and EN 14395-1 organoleptic assessment after the full fusion cycle. The final component, not the powder alone, determines regulatory status, because weld oxides, conversion residues and absorbed oil can contribute to odour and TOC migration. ES NAT MAC PA11 is a natural polyamide 11 grade; if used in cold potable water lines, the extraction test is conducted with a surface-to-volume ratio representative of the actual installed condition. Post-bake at 200°C for 30 min often reduces residual monomers and process aids below the detection limits of the selected analytical method, but this must be verified lot-by-lot. Published data for this specific natural powder in hot potable water above 60°C is limited; design qualification should restrict service to cold or tempered water unless national approvals allow otherwise.
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Arkema Rilsan Fine Powders ES NAT MAC PA11 is a natural-colour polyamide 11 powder supplied for dry electrostatic deposition of fusion-bonded protective coatings on metallic substrates. The grade designation identifies the polymer chemistry as polyamide 11, the ES electrostatic-spray particle-size cut, the unpigmented natural appearance, and the MAC production-control package associated with metal-adhesion coating powders. The material is not a solventborne or waterborne coating. In service it is melted, coalesced, and solidified into a continuous polyamide 11 film with high abrasion resistance, low moisture absorption relative to short-chain polyamides, and resistance to many oils, fuels, salt solutions, and cleaning chemicals. Typical components coated with this powder include pipe spools, valve bodies, pump volutes, dishwasher baskets, marine hardware, rail brackets, and hydraulic fittings where combined mechanical impact, chemical exposure, and corrosion protection are specified.
Incoming inspection against the manufacturer’s certificate of analysis normally verifies the fused polymer density, melting peak, particle-size distribution, moisture content, and bulk density. The following values are typical acceptance ranges for electrostatic-spray coating-grade PA11; lot-specific values are supplied with the batch documentation.
| Property | Test method | Typical range |
|---|---|---|
| Fused polymer density | ISO 1183-1:2019 | 1.03–1.05 g/cm³ |
| Melting peak by differential scanning calorimetry | ISO 11357-3:2018 | 183–190 °C |
| Particle-size D50 by laser diffraction | ISO 13320:2020 | 80–125 µm |
| Particle-size D10 by laser diffraction | ISO 13320:2020 | 35–55 µm |
| Particle-size D90 by laser diffraction | ISO 13320:2020 | 150–200 µm |
| Moisture content at delivery | ISO 15512:2019 | <0.20 % |
| Bulk density | ISO 60:2018 | 0.45–0.60 g/cm³ |
The melting peak obtained by dynamic scanning calorimetry is not a cure temperature. On production lines the metal part is maintained above the polymer melting peak during powder deposition so that the particles adhere, fuse, and flow. The particle-size distribution is the principal variable controlling electrostatic cloud density, gun clogging, and levelling. A D50 in the 80–125 µm band with D90 below 200 µm reduces spitting and uneven film build while allowing sufficient charge-to-mass ratio at the gun. Excess fines below 10 µm raise dusting and reduce flowability; excess coarse particles above 250 µm can crater or remain partially fused. Moisture is controlled because water depresses charge acceptance and produces bubbles at the melt surface during oven dwell. A new lot on a plant-scale hopper may require adjustment of fluidising air flow because bulk density and fines content shift slightly from batch to batch.
On a typical line, the substrate is degreased and grit-blasted to Sa 2½ according to ISO 8501-1:2007. The blasted profile is measured at Rz 50–90 µm using ISO 4287:1997. After dust extraction, a thin primer is applied at 5–15 µm dry film thickness when the part requires maximum corrosion resistance; on unprimed non-ferrous alloys adhesion can be batch-dependent. The primed part is preheated in a forced-air oven to a metal temperature of 240–300 °C, then transferred to the powder booth. The corona gun is operated at 60–100 kV and 20–60 µA, with powder output between 80 g/min and 200 g/min. For Faraday-cage zones such as the inside corners of pump casings, tribo-charging or reduced gun voltage is used to avoid back-spray and heavy edge build. After deposition, the part returns to an oven for 5–10 min at 200–220 °C to complete flow and levelling. Film thickness for immersion service is commonly controlled at 250–400 µm and measured according to ISO 2808:2019. If the line stops and metal temperature falls below the melting peak, the deposit remains granular and must be stripped; prolonged exposure above 320 °C can yellow and oxidise the polyamide surface.
Closed containers are stored at 15–25 °C and below 50 % relative humidity. The powder is hygroscopic. Open bins in humid plants accumulate moisture, and a moisture level above 0.20 % produces bubble defects and reduces charge acceptance. If the product has been exposed to air at relative humidity above 60 %, it is dried at 70–80 °C for 4–6 h in a dehumidified-air oven. Fluidising air should have an oil-free supply with a pressure dew point below -20 °C. Reclaimed overspray is screened through a 150 µm sieve and blended with virgin powder at a maximum of 20–30 wt%. Higher reclaim fractions shift the particle-size distribution toward fines, reduce flowability, and increase spitting. The material is thermoplastic; no chemical crosslinking occurs during cure, and overspray is recoverable when it is not contaminated with dust, oil, moisture, or other polymer powders.
Because fusion and levelling require the part to exceed the polyamide 11 melting peak, ES NAT MAC PA11 is unsuitable for substrates that cannot tolerate 200 °C. Aluminium alloys that lose mechanical properties above 150 °C, soldered assemblies containing Sn–Pb or Sn–Ag–Cu joints, and polymer-matrix composite parts are excluded unless heat tolerance is demonstrated. Reducing film thickness below 150 µm or shortening oven dwell does not remove the requirement to melt the powder. In such cases a lower-melting polyamide 12 powder, an epoxy powder, or a liquid coating is usually substituted. Published data for ES NAT MAC in low-temperature cure configurations is limited. The powder must not be combined with amine-based additives or other reactive species that could shift melt stability or stain the coating during post-cure. Residual cutting fluids, silicone release agents, and phosphate residues must be removed before blasting to prevent cratering and loss of adhesion.
Corrosion testing is meaningful only after the film is verified free of holidays. A high-voltage holiday detector is set at approximately 5 kV per 0.1 mm of film thickness. For a 300 µm coating, the test voltage is therefore around 15 kV using ASTM D5162-21. Salt-spray resistance can be evaluated according to ISO 9227:2022, but the result depends on the primer chemistry, substrate alloy, film thickness, and scribe configuration. Immersion testing in deionised water, sodium chloride solution, or hydrocarbons uses ISO 2812-1:2018. Polyamide 11 is not universally resistant to strong oxidising acids, cresol, concentrated formic acid, or prolonged exposure to boiling water above its practical service limit; these environments are outside the recommended service envelope.
The principal chemical difference between this product and polyamide 12 coating powders is the monomer source. Polyamide 11 is polymerised from 11-aminoundecanoic acid derived from castor oil, while polyamide 12 is derived from petrochemical laurolactam. Renewable carbon content can be assessed by ASTM D6866-22 when biobased content is a purchase specification. Compared with polyamide 12 powders, PA11 typically exhibits a higher melting peak, slightly higher fused density, and similar low water absorption relative to short-chain polyamides. Within the Rilsan Fine Powders range, ES NAT MAC is distinguished from fluidised-bed grades by its finer particle-size cut and electrostatic-spray surface behaviour. The coarser fluidised-bed grades are not directly interchangeable on a corona-spray line. Published data for side-by-side quantitative comparisons with other Rilsan Fine Powder grades in the ES NAT MAC configuration is limited; batch-specific certificates of analysis and application trials on the intended line are required for reliable substitution.
Under REACH, the polymer is typically exempt from registration as a polymer under the polymer exemption, but the safety data sheet and exposure scenario for the supplied grade remain the controlling documents. For food-contact service, the presence of PA11 alone does not establish compliance. The final formulation and condition of use must be assessed against 21 CFR 177.1500 or EU Regulation 10/2011 as applicable. Industrial use does not require a RoHS-relevant heavy-metal package for the unmodified natural powder, but later addition of pigment concentrates or functional additives may change the regulatory status of the final coated article.
For cold-climate automotive and marine fittings, low-temperature impact testing is normally specified on the finished component rather than on the raw powder. Test methods include ASTM D2794-93(2019) for rapid deformation and ISO 6272-1:2011 for falling-weight impact. Pass/fail thresholds are part-specific and are not contained in the powder datasheet. The test values are strongly influenced by primer selection, substrate thickness, surface preparation, and cure thermal history.
