| HS Code | 440937 |
| Product Name | Arkema Rilsan Fine Powders T GREY 7144 AC PA11 |
| Chemical Family | Polyamide 11 (PA11) |
| Color | Grey |
| Specific Gravity | 1.04 g/cm³ |
| Melting Point | 186 °C |
| Particle Size | D50 = 60 µm (typical) |
| Bulk Density | 0.45 g/cm³ (typical) |
| Water Absorption | 0.3% after 24 hours |
| Tensile Strength | 45 MPa (typical) |
| Elongation At Break | 250% (typical) |
| Shore Hardness | 70 Shore D |
| Vicat Softening Point | 145 °C (typical) |
As an accredited Arkema Rilsan Fine Powders T GREY 7144 AC PA11 factory, we enforce strict quality protocols—every batch undergoes rigorous testing to ensure consistent efficacy and safety standards.
| Packing | Supplied as 25 kg bags of grey fine powder, Arkema Rilsan T GREY 7144 AC PA11 for coating applications. |
| Container Loading (20′ FCL) | 20′ FCL container loading of Arkema Rilsan Fine Powders T GREY 7144 AC PA11, securely packed in sealed bags on pallets. |
| Shipping | Rilsan PA11 Fine Powder T Grey 7144 is a polyamide-11 powder shipped in sealed, moisture-resistant bags or drums. Not classified as dangerous goods for general transport, but avoid dust accumulation, ignition sources, and excessive heat. Keep dry, secure properly, and ensure containers are labeled with product identification and lot number. |
| Storage | Store Rilsan Fine Powders T GREY 7144 AC PA11 in its original, tightly sealed container in a cool, dry, well-ventilated area. Protect from moisture, direct sunlight, and excessive heat. Keep away from flames, sparks, and ignition sources. Use within the manufacturer’s shelf life and reseal promptly after use to prevent contamination or clumping. |
| Shelf Life | Shelf life is typically 2 years when stored unopened in a cool, dry place away from sunlight. |
Across automotive fluid-handling and chassis component coating lines, Arkema Rilsan Fine Powders T Grey 7144 AC PA11 is charged as a single-binder powder at 98.5–99.5 wt% of the fluidised-bed charge, with the remaining 0.5–1.5 wt% consisting of dry-flow silica and electrostatic charge-control additives already present in the as-supplied pigment package; the same addition ratio is retained after return of overspray through a 150 µm vibratory sieve, because accumulation of fines below 40 µm above 30 wt% of the reclaimed feed has been observed on production lines to increase orange-peel and reduce edge coverage on stamped brackets. Qualification for under-hood and chassis service is normally performed against ISO 9227 neutral salt spray for 1,000 h on zinc-phosphated steel substrates, ASTM D2794 rapid-deformation impact at 18 J reverse impact, and ISO 1519 cylindrical bend at a 6 mm mandrel; supply-chain documentation is managed under IATF 16949:2016 clause 8.4.2.4 for supplier quality management. The coating sequence consists of alkaline degreasing at 60 °C, shot blasting to Sa 2½ per ISO 8501-1:2007, zinc phosphating at 2.5–3.5 g/m², preheating in a continuous oven to 340–360 °C, immersion in a 1.5 m³ fluidised-bed tank with a porous polyethylene membrane and air flow of 180–220 m³/h per m² for 3–6 s, post-fusion at 190–200 °C for 3–4 min, and water quenching. Substrate thickness above 4 mm requires a preheat offset of +15 °C to compensate for the heat sink, while sheet-metal stampings below 1.5 mm tolerate no more than 310–320 °C to avoid thermal sag and local film buildup at radii. Finished component classes include brake hose brackets, seat belt anchor loops, bonnet latch strikers, battery tray brackets, and fuel filler neck flanges, at a target film thickness of 220–350 µm; edges with radius below 0.5 mm exhibit thinning and are inspected by low-voltage holiday detection at 2.0 kV per ISO 29601. When ambient relative humidity exceeds 60%, the powder is dried at 80 °C for 4 h before transfer to the coating hopper to reduce steam pinholes during fusion.
The electrostatic-spray grade can be applied as a 100% solids one-component system; no solvent, water, or additional binder is required, and the only formulation variable is the ratio of reclaimed overspray to virgin powder, which is held at or below 30 wt% of the feed after sieving at 125 µm. Compliance for repeat-use food-contact articles is anchored to FDA 21 CFR 177.1500 for nylon resins, EU Regulation 10/2011 as amended for plastic materials intended to come into contact with food, and EN 12875-1 mechanical dishwashing resistance; appliance-level electrical safety considerations are handled under IEC 60335-2-5 for dishwashers. In a typical downstream process, carbon-steel or stainless-steel wire racks are degreased, phosphated, preheated to 80–120 °C, coated in a corona spray booth at 60–80 kV and 0.5–1.2 bar powder transport air, and cured at 190–200 °C for 10–12 min. Film thickness is controlled from 250–400 µm; coating below 180 µm at wire crossing points produces pinpoint rust within approximately 300–500 cycles under standard dishwasher detergent exposure, while thickness above 600 µm causes sags, wire-to-wire bridging, and interference in the rack slide. Lines producing approximately 1,200 baskets per day typically detect that reclaim rates above 30 wt% raise fines concentration below 40 µm, which degrades transfer efficiency on vertical wires and increases visual non-uniformity. Finished items include lower and upper dishwasher baskets, cutlery holders, and wine-glass retainers; the Grey 7144 pigment package is melt-compounded into the PA11 matrix and does not require post-coat painting, which eliminates the dimensional tolerance risk associated with liquid topcoats.
Where steel potable-water valve bodies and pipe spools require internal and external corrosion protection without post-coat painting, the Grey 7144 AC powder is applied at 100% binder solids; dry-bed contamination with hydrophobic release agents or zinc dust is kept below 0.05 wt% because surface contamination is known to cause fisheyes and loss of wet adhesion during water-immersion service. Regulatory compliance for this sector is demonstrated through ANSI/AWWA C224 for nylon-11 and nylon-12 based polyamide coating systems on steel water pipe and fittings, and NSF/ANSI/CAN 61 for drinking water system components; published data for this exact grey-pigmented variant under chloramine concentrations above 3 mg/L is limited, so coupon validation under AWWA C224 is recommended before specification in high-residual disinfection systems. The coating process consists of blast cleaning the steel substrate to Sa 2½ per ISO 8501-1:2007 with angular steel grit, producing a 50–75 µm surface profile, followed by preheat at 340–360 °C, immersion in a fluidised bed for 4–10 s, post-cure at 190–200 °C for 4–5 min, and 100% holiday detection at 3.0 kV for a 400 µm nominal thickness. The critical processing window on 6 mm carbon-steel valve bodies is narrow: preheat below 320 °C fails to fully fuse the powder into internal fillets of gate-valve cavities, while preheat above 370 °C can discolor the grey pigment and reduces impact resistance of the fused film. Masking of machined seats and flange faces is performed before coating, and manual touch-up is executed with an electrostatic hand gun at 50–60 kV after demasking. Finished products include gate valves, check valves, Y-strainers, pipe spools, and fire hydrant internals, with dry film thickness of 350–500 µm for immersed service and 250–300 µm for external atmospheric exposure.
The powder is used neat at 100% PA11 binder; when continuous service temperature exceeds 90 °C in charge-air cooling or traction-battery circuits, a heat-stabiliser masterbatch can be dry-blended at 1.0–2.0 wt%, but the Grey 7144 pigmentation is already melt-compounded and requires no further colour adjustment. Electrical insulation performance is verified over flat coated panels according to IEC 62631-3-1 dielectric strength, ASTM D149 short-time breakdown, and IEC 60112 comparative tracking index, with a target CTI of 600 V; flame performance of the assembled component is assessed to IEC 60695-11-10 on the composite structure rather than on the powder alone. In the downstream process, copper or aluminium busbars are solvent-degreased, grit-blasted, preheated to 80–120 °C, sprayed electrostatically at 60–70 kV, and cured at 190–200 °C for 10–15 min. Contact pads are masked with high-temperature silicone caps; edge coverage on 10 mm × 3 mm copper profiles is maintained by spraying at 45° incidence and rotating the bar during application. Film thickness is specified at 300–500 µm; breakdown voltage measured by a 500 V/s ramp on flat samples must exceed 25 kV/mm. The main failure mode on sharp edges is local thickness collapse below 120 µm, which is corrected by a second pass at edge zones before full cure. Finished product types include power distribution busbars, busbar joints, motor terminal insulation, and EV battery chamber side plates; the powder must be dried at 80 °C for 4 h when storage humidity exceeds 60% RH, otherwise pinholes and reduced dielectric strength occur.
The powder is applied at 100% solids; for carbon-steel fasteners a zinc phosphate conversion layer is used to maintain adhesion, while for stainless-steel deck hardware a thin zinc phosphate layer is applied solely to provide mechanical keying. Compliance for topside marine atmospheric exposure is verified by ISO 9227 neutral salt spray for 1,500 h on phosphated steel and ISO 20340 for offshore atmospheric exposure; immersed fasteners additionally undergo cathodic disbondment testing to ISO 15711 because of galvanic coupling with adjacent metals. In production, M12 × 60 carbon-steel bolts are degreased, phosphated, preheated to 340–350 °C, dipped in a 0.5 m³ fluidised bed for 3–5 s, and post-cured at 190–200 °C for 3 min, producing 250–380 µm films on the bolt head and thread flanks; threads are chased after coating to remove excess powder from the load-bearing flanks. Finished items include deck bolts, hinge pins, lifting eyes, and valve handles on workboats and offshore access platforms. Continuous UV exposure on horizontal exterior surfaces is an operational boundary; polyamide 11 may chalk over 5–10 years without a UV-stable topcoat, and published data for this specific grey pigment under tropical UV is limited.
Chemical immersion resistance is assessed under ISO 2812-1 by 30-day immersion in 10 wt% sulfuric acid, 10 wt% sodium hydroxide, and aliphatic hydrocarbon reference fluids at 23 °C and 40 °C; coating integrity after exposure is measured by cross-cut adhesion to ISO 2409 and by electrochemical impedance spectroscopy at 0.1 Hz on scribed panels. The coating is applied as a 100% solids system; for pump impeller applications where suspended solids exceed 5 wt% of the slurry, a two-layer build is specified without interlayer primer, consisting of a first layer at 150–200 µm, intermediate cooling to a 120 °C surface temperature, and a second layer at 150–200 µm. The downstream process for cast-iron pump housings consists of blast cleaning to Sa 2½ per ISO 8501-1:2007, degassing at 200 °C for 1 h to remove absorbed hydrocarbons from casting porosity, preheating to 330–350 °C, coating in a fluidised bed or with reciprocating electrostatic guns for internal cavities, and curing at 195–200 °C for 5–8 min. Production-scale equipment with infrared preheat zones has reduced pinhole counts from 4–6/dm² to below 1/dm² at 350 °C on cast iron; the absence of the degassing step is the principal cause of pinhole clusters in volute cavities. Finished items include pump impellers, volute casings, filter housings, and valve bodies for dilute mineral acid and salt brine transfer. Continuous immersion in concentrated acetic acid or phenolic disinfectants above 50 °C is not recommended because polyamide 11 swells above 3% and the coating may soften, reducing erosion resistance.
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The primary distinction is the amide-group density in the repeat unit. PA11 has one amide group per 11 carbon atoms, which yields lower equilibrium moisture uptake than PA6 or PA66 and a lower density than PA6. In immersion service, PA11 coatings are specified where dimensional stability in humid environments is tighter than for PA6/PA66; water uptake measured by ISO 62 at saturation is typically 1.8% to 1.9% for unfilled PA11, compared with 9% to 10% for PA6. Against PA12, PA11 typically exhibits a higher melting peak and higher renewable carbon content, but PA12 may show slightly lower moisture uptake. Because the 11-aminoundecanoic acid monomer is obtained from castor oil, PA11 coatings are used where renewable carbon content measured by ASTM D6866 is part of the specification; unmodified grades commonly exceed 90% bio-based carbon. The fine powder designation indicates that the product has been milled or classified to a lower median particle size than standard Rilsan PA11 powder grades, improving coverage of sharp edges and small-diameter bores while requiring closer control of fluidisation air flow.
On a production-scale fluidised-bed line, the substrate is preheated in a forced-air or infrared tunnel before immersion in the aerated powder volume. For thin-wall steel fabrications with wall thickness below 4 mm, preheat settings between 280 °C and 320 °C are typically required to compensate for thermal loss between oven removal and immersion. The powder is suspended by compressed air dried to a pressure dew point below −40 °C; bed pressure-drop and bubble quality are monitored by differential pressure transducers. A deviation greater than 15% from the qualified pressure-drop setpoint often indicates moisture uptake, fine-particle attrition, or a shift in the D50. The component remains in the fluidised cloud until conductive transfer and particle sintering form a continuous film; minimum dry-film thickness for corrosion service is commonly set at 250 µm, measured according to ISO 2178 on ferrous substrates. Underheating creates a brittle, non-fused layer that fails crosshatch adhesion; overheating above about 400 °C produces visible darkening and thermo-oxidative chain scission in the polyamide matrix.Electrostatic spray is selected when components are too large for dip tanks, when one side of a sheet or pipe interior must remain uncoated, or when line changeover between colours demands a shorter cleaning cycle. In this configuration, the PA11 powder is transported from a fluidised hopper to a corona charging gun operated at 60 kV to 100 kV; ground continuity should be verified so that deposition efficiency does not fall outside the qualified range. The sprayed part is then heated in a convection oven at 220 °C to 250 °C for 3 min to 10 min, depending on metal mass and target dry-film thickness. Thick sections require longer dwell because the coating temperature must exceed the PA11 melting peak throughout the interface; pyrometric monitoring of the part surface, not oven air temperature, is the controlling variable. Premature oven ramping can sinter the powder surface before the underlying layer has coalesced, trapping air and producing crater defects. For this reason, production lines with high-mass valve bodies or pump bodies often use a two-stage profile: a lower zone to complete coalescence and a short final zone to level the film.
Particle-size distribution measured by ISO 13320 is a critical incoming-inspection parameter. Fine powder fractions with a D50 in the 30 µm to 45 µm range can enter narrow grooves and cover sharp edges more uniformly than coarse powders, but their fluidisation behaviour is more sensitive to moisture and electrostatic charge. Bulk density determined by ISO 60 for fine PA11 powders typically falls between 0.45 g/cm³ and 0.60 g/cm³; values outside this band can indicate agglomeration, excessive fines, or grade substitution. On a powder-coating line, batch-to-batch D50 variation greater than 5 µm has been recorded to alter edge coverage on fastener threads; the magnitude depends on geometry, immersion time, and gun voltage. For grey-pigmented grades such as T GREY 7144 AC, pigment dispersion within the powder particles influences both colour consistency and dielectric charging behaviour. Sieve retention on 63 µm mesh according to ISO 2591-1 should be trend-charted to identify mill wear or classifier drift.The table compares typical unfilled polyamide coating resin values across PA11, PA12, and PA6. Values are not grade-specific for T GREY 7144 AC because pigmentation and additives shift mechanical and thermal properties; they are included to bound formulation decisions.
| Property | PA11 | PA12 | PA6 | Test method |
|---|---|---|---|---|
| Density | 1.03–1.05 g/cm³ | 1.01–1.02 g/cm³ | 1.13–1.15 g/cm³ | ISO 1183-1 |
| Melting peak | 183–187 °C | 176–180 °C | 220–225 °C | ISO 11357-3 |
| Saturation water uptake | 1.8–1.9% | 1.4–1.6% | 9–10% | ISO 62 |
| Tensile yield | 42–50 MPa | 43–50 MPa | 75–85 MPa | ISO 527-2 |
| Elongation at break | 200–300% | 200–300% | 50–100% | ISO 527-2 |
| Shore D hardness | 65–70 | 62–68 | 75–80 | ISO 868 |
Compliance for a grey-pigmented PA11 powder is evaluated at the formulated-product level. The base PA11 polymer is subject to REACH registration under EC 1907/2006; RoHS Directive 2011/65/EU compliance must be verified for the specific pigment package, especially for cadmium and lead carrier systems that may have been used in older colour grades. Food-contact suitability is not automatically conferred by the base resin; any application for repeated contact with food should be assessed against FDA 21 CFR 175.300 for resinous and polymeric coatings or applicable national equivalents. The absence of a crosslinking agent does not modify the requirement to test migration of the pigment package.
Immersion in hot water or steam above 70 °C can make hydrolysis a limiting mechanism for PA11 coatings; accelerated testing should follow ISO 175 at the specified maximum service temperature because published data for this specific grey-pigmented configuration is limited. Concentrated hydrochloric acid, formic acid, and halogenated solvents at elevated temperature are known solvating or stress-cracking agents for PA11 and should be excluded from the chemical resistance envelope unless validated by component-specific immersion trials. Diesel, hydraulic fluid, and aliphatic hydrocarbon immersion generally follows mass-change behaviour described in ISO 175. When the powder is stored in an uncontrolled warehouse above 60% relative humidity, pre-drying at 80 °C for 2 h to 4 h in dehumidified air is required before use; a moisture content above 0.2% measured by ISO 15512 increases the risk of pinholes and micro-blisters in the fused film. The powder should be kept sealed below 40 °C to prevent pigment migration and particle sintering.
