| HS Code | 875861 |
| Product | Arkema Rilsan Fine Powders T BLACK 7450 AC PA11 |
| Chemical Nature | Polyamide 11 (PA11) |
| Form | Fine powder |
| Color | Black |
| Specific Gravity | 1.04 g/cm³ |
| Melting Point | 186 °C |
| Bulk Density | 0.55 g/cm³ |
| Particle Size D50 | 40 µm |
| Particle Size D90 | 80 µm |
| Maximum Particle Size | 120 µm |
| Water Absorption 24h | 0.5% |
| Water Absorption Saturation | 1.2% |
| Tensile Strength | 44 MPa |
| Elongation At Break | 200% |
| Shore Hardness D | 72 |
| Dielectric Strength | 20 kV/mm |
| Volume Resistivity | 10^12 Ω·cm |
| Abrasion Resistance | Excellent |
As an accredited Arkema Rilsan Fine Powders T BLACK 7450 AC PA11 factory, we enforce strict quality protocols—every batch undergoes rigorous testing to ensure consistent efficacy and safety standards.
| Packing | Supplied in 20 kg multi-wall paper bags, this black PA11 fine powder is free-flowing and designed for coating applications. |
| Container Loading (20′ FCL) | Container Loading (20′ FCL): Arkema Rilsan Fine Powders T BLACK 7450 AC PA11, securely packed for safe chemical shipment. |
| Shipping | Arkema Rilsan Fine Powders T BLACK 7450 AC PA11 is shipped as a fine polyamide powder in sealed, moisture-proof bags or drums, placed on pallets. Shipped dry and protected from humidity and direct heat. Standard non-hazardous cargo, though dust control and grounding procedures are recommended during handling. |
| Storage | Store Rilsan Fine Powders T Black 7450 AC in a cool, dry, well-ventilated area away from direct sunlight, heat sources, and open flames. Keep the original container tightly closed to prevent moisture absorption and contamination. Avoid dust accumulation; use grounded equipment to prevent static discharge. Maintain moderate temperatures and protect from mechanical damage. |
| Shelf Life | Shelf life is 2 years from manufacture when stored in original, unopened packaging in a cool, dry place. |
In chlorinated wastewater treatment service, carbon steel butterfly valve bodies, check valves, and actuator brackets coated with Rilsan Fine Powders T BLACK 7450 AC PA11 are processed through a sequence of hot alkaline degreasing, angular steel grit sweep blasting to ISO 8501-1 Sa 2.5, and application of a zinc-free adhesion-promoting primer at a dry film thickness of 10±2 μm. The primer is flash-dried for 15–20 min at 80–100 °C before the part enters a convection preheat oven set to yield a metal surface temperature of 280–300 °C, measured with a contact thermocouple on the thickest flange section and cross-checked by infrared pyrometry at the valve throat. Powder is applied by fluidized-bed immersion for 3–8 s, with the bed fed by compressed air dried to a pressure dew point below −40 °C and filtered to 0.01 μm to prevent agglomeration. The post-flow cycle uses 2–4 min at 200–220 °C surface temperature to complete coalescence without inducing oxidative yellowing of the black pigmented layer. External dry film thickness is held between 250–350 μm, while internal waterway coverage on the blind side of butterfly discs may draw down to 150–200 μm; high-voltage holiday detection at 5 kV is therefore applied across all surfaces including seat pockets. Acceptance testing follows ISO 9227 neutral salt spray for 1,000 h, with no blistering exceeding ASTM D714 rating 8F and no red rust at the scribe, plus adhesion retained at no less than 4B under ASTM D3359 method B. Because fine PA11 powder absorbs atmospheric moisture, storage is controlled below 60% RH; if exposed to humid air, pre-drying at 80 °C for 4 h in a circulating oven is required before fluidization. Because the carbon black pigment and anticorrosion additive package alter the water-sorption profile relative to natural PA11, grade-specific corrosion resistance must be re-qualified on production parts when the operating chloride concentration exceeds 2,000 ppm or pH drops below 4. The terminal products are valves, check discs, and actuator brackets for municipal and industrial water lines.
Hardware in domestic and commercial dishwashers—cutlery baskets, rack tines, and impingement screens—is coated with the same PA11 fine powder by electrostatic corona spray. Low-carbon steel wire of 3–5 mm diameter is first resistance-welded into rack geometry, then processed through an iron phosphate conversion coating with a coating weight of 2–4 g/m² and dried. Corona-gun voltage is maintained between 60–80 kV and powder delivery at 70–120 g/min, with part-grounding resistance verified below 1 MΩ before spraying. Because fine PA11 powder shifts particle size distribution under mechanical reclaim, the system is operated at a virgin-to-reclaim ratio of 70:30 to 50:50 by weight, and laser diffraction analysis per ISO 13320 is performed when the reclaim fraction exceeds 30 wt%. Dry film thickness is held at 180–250 μm on tines and 150–200 μm on basket grids, followed by a fusion cycle of 10–15 min at 200–220 °C part temperature. Under detergent exposure—0.5–1.0 wt% sodium metasilicate plus 0.2–0.5 wt% sodium carbonate in 65–75 °C water for 500 cycles—the coating is examined for gloss change, blistering per ASTM D714, and adhesion retention per ASTM D3359. Edge coverage on welded intersections is the controlling quality variable, and a minimum two-pass wrap spray is specified to avoid thin-film failure at wire crossover points. The terminal products are dishwasher rack assemblies and cutlery baskets, where the black PA11 layer must resist cutlery impact, alkaline detergents, and hot-water swelling without delaminating from the phosphate interface.
For copper bus bars that carry low-voltage DC power in industrial drives and battery storage cabinets, electrostatically applied PA11 fine powder functions as an insulating and abrasion-resistant jacket. The copper or tin-plated copper substrate is degreased, edge radii are maintained at 1.0–2.0 mm to avoid high-voltage stress concentrations, and the part is preheated to 60–80 °C before corona spray at 40–60 kV. A fusion cycle of 8–12 min at 190–210 °C produces a dry film thickness of 250–400 μm; thickness below 250 μm increases the risk of pinhole defects, while thickness above 400 μm can create dimensional interference in bolt-on connection points. Because carbon black pigment can influence surface and volume resistivity, lot-specific dielectric verification is required under IEC 62631-3-1 on cured film specimens, and a proof test at 1.5 kV for 60 s is applied across actual insulated bars. The test configuration should include the bus bar edge, bend radius, and molded-through holes because dielectric failure initiates at these discontinuities. Flammability classification under UL 94 must be re-verified for the pigmented grade; published data for this specific black PA11 formulation is limited. Terminal assemblies are insulated conductors, tapped bus bars, and PCB bus links; fastener holes are masked or reamed after coating to maintain hardware torque.
The dominant process constraint in lining a cast iron pump volute and impeller with PA11 fine powder is the conflict between corrosion protection and hydraulic profile retention. For volute interiors and casing bowls, a fluidized-bed dip process converts a preheated casting at 270–290 °C into a fused lining of 300–400 μm after 4–10 s immersion and 1–3 min post-flow at 200–220 °C. On impeller vanes, the leading edge and suction-side profile are restricted to 150–200 μm because excess thickness distorts shutoff head and shifts best efficiency point. The powder is applied after masking of bearing bores, seal glands, threaded bosses, and coupling fits with high-temperature tape and silicone plugs; dry film thickness is verified with a magnetic induction gauge per ISO 2178 at three positions per vane and five positions per volute. A high-voltage holiday test at 5 kV is applied to 300 μm linings, with any pinhole repaired by local preheating and powder touch-up. Abrasion performance is ranked by ASTM D4060 using CS-17 wheels at a 1,000 g load, and slurry abrasion response is compared by ASTM G75 with 50 wt% silica in water. The operational boundary is set by deionized water exposure above 60 °C; prolonged immersion under these conditions increases water absorption in PA11 and can reduce interfacial adhesion unless an epoxy primer of 15–25 μm is applied and fully cured prior to powder coating. The end products are slurry pump volutes, impellers, and wear ring carriers; published data for T BLACK 7450 AC in high-velocity slurry above 5 m/s is limited and should be generated on a production-scale pump test loop rather than extrapolated from film coupons.
| Application segment | Typical preheat or fusion cycle | Dry film thickness | Primary test standard |
|---|---|---|---|
| Wastewater valve body | 280–300 °C preheat; 200–220 °C post-flow | 250–350 μm | ISO 9227 |
| Dishwasher rack | 200–220 °C fusion | 180–250 μm | ASTM D3359 |
| Bus bar insulation | 190–210 °C fusion | 250–400 μm | ASTM D149 |
| Pump impeller | 270–290 °C preheat | 150–200 μm on vanes | ASTM D4060 |
| Offshore clamp | 270–290 °C preheat | 300–500 μm | ISO 9227 |
Where outdoor public transport stanchions and handrails are specified with black, impact-resistant polymer coatings, PA11 fine powder is applied over aluminum tube or stainless steel tube after a chromate conversion coating per MIL-DTL-5541 Type II or a trivalent chromium or organosilane replacement aligned with REACH. The powder is sprayed electrostatically to 150–220 μm dry film thickness and fused for 12 min at 200 °C part temperature. The black pigmented system is selected because carbon black contributes to ultraviolet screening, although outdoor durability must still be verified by ISO 4892-2 xenon arc testing; a qualification criterion of ΔE no greater than 3.0 after 1,000 h exposure per ISO 4892-2 and color measurement per ISO 11664-4 is used. Impact damage from passenger luggage and service carts is measured by ASTM D2794 reverse impact at 40 in-lb with no delamination from the conversion coating, and wear on high-grip areas is checked by ASTM D4060 with CS-10 wheels at 500 g. The conversion layer and powder fusion cycle must be matched so that the aluminum substrate does not exceed 220 °C for more than 20 min, which would hydrate the aluminum oxide interface and reduce adhesion. Terminal products are interior rail car stanchions and platform handrails where flammability and smoke density must be confirmed to the relevant rail vehicle specification, because carbon black and PA11 can contribute to fuel load.
When stainless steel mixer paddles, dough hooks, and auger screws are lined with PA11 fine powder, the application is governed by food-contact substance limits rather than only by corrosion test performance. The powder is applied to 316L or 304 stainless steel after degreasing and chemical passivation; preheat is restricted to 220–240 °C to limit distortion and oxide tinting, and the powder is sprayed or fluidized to a dry film thickness of 250–350 μm. Fusion is completed at 200–220 °C for 10–15 min; a thick film is required to survive metal-blade impacts and abrasion from granular food media. Compliance is assessed under FDA 21 CFR 177.1500 for nylon resins, with end-use condition of use selected from 21 CFR 177.1500(c) because the test solvent and time-temperature protocol depend on food type and temperature. For the European market, EU 10/2011 requires an overall migration below 10 mg/dm², and specific migration of residual 11-aminoundecanoic acid and cyclic oligomers must be quantified by LC-MS/MS; published migration data for T BLACK 7450 AC are limited, so the formulator and converter are responsible for end-use migration testing. Cleaning-in-place exposure with 1–2 wt% sodium hydroxide at 80 °C for 30 min is the practical hydrolysis boundary; continuous steam exposure above 121 °C is not recommended because PA11 undergoes hydrolytic molecular weight reduction at elevated temperature and pressure. Terminal products include mixer paddles, helical conveying screws, and indexer plates in snack and bakery lines, but cut edges and fastener holes must be sealed to prevent food ingress under the coating.
Offshore pipe clamps and cable cleats fabricated from hot-dip galvanized S355 structural steel are coated with a combined primer and PA11 powder system when both corrosion resistance and impact resistance are required during bundle installation. The galvanized surface is sweep blasted to a 25 μm profile using non-metallic abrasive, then an epoxy primer at 15–25 μm is applied and cured before the fluidized-bed powder step. The part is preheated to 270–290 °C, immersed for 5–10 s, and post-flowed at 200–220 °C to produce 300–500 μm of PA11 on external clamp bodies; flange seating areas and threaded studs are masked or machined to restrict the coating to 100–150 μm to preserve clamp force. Salt spray resistance is tested according to ISO 9227 for 1,500 h with no blistering and no loss of adhesion under ASTM D3359; low-temperature impact at −40 °C is conducted with ASTM D2794 to confirm that the pigmented PA11 does not crack at installation temperatures encountered in arctic or deepwater topside environments. Bending adhesion is assessed with ISO 1519 mandrel bend on witness coupons processed in the same batch. The operational boundary is the upper service temperature of the primer, which often limits the assembly to continuous contact below 80 °C unless a high-temperature primer is substituted. Terminal products are gas, hydraulic, and umbilical clamps where black pigmentation also provides a consistent visual finish across batch-to-batch production.
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Arkema Rilsan Fine Powders T BLACK 7450 AC PA11 is a carbon-black-pigmented polyamide 11 powder supplied for dry-film coating of metal components. The grade designation identifies a fine powder thermoplastic within the Rilsan family, with T indicating the coating-powder form, BLACK indicating the pigment package, and AC identifying the anticorrosion additive system. Unlike solvent-borne polyamide coatings, the material is applied at 100 % solids and forms a film by melt coalescence and cooling rather than by solvent evaporation. The polyamide 11 base resin is produced from castor oil-derived monomers; renewable carbon documentation is typically supported by ASTM D6866. Fused films from this polymer class are semi-crystalline thermoplastics and can be remelted in repair operations, which differentiates them from thermoset epoxy or polyester powder coatings.
Incoming powder control for this class of Rilsan fine powder typically specifies a particle-size distribution with a median particle size of 80–120 µm and a maximum sieve residue of 0.5 % on a 250 µm screen when tested per ISO 8130-1. Apparent powder density is usually reported in the range 0.45–0.55 g/cm³ by ISO 8130-2; fused film density is 1.03–1.05 g/cm³ by ISO 1183-1. The melting peak of polyamide 11 homopolymer is 183–187 °C by ISO 11357-3. These values are characteristic of the product class and should be confirmed against lot-specific certificates for T BLACK 7450 AC.
| Control parameter | Typical range/class value | Test method |
|---|---|---|
| Median particle size | 80–120 µm | ISO 8130-1 |
| Apparent powder density | 0.45–0.55 g/cm³ | ISO 8130-2 |
| Fused film density | 1.03–1.05 g/cm³ | ISO 1183-1 |
| Melting peak | 183–187 °C | ISO 11357-3 |
| Fused film Shore D hardness | 70–75 | ISO 868 |
| Water absorption at saturation | 1.8–2.0 % | ISO 62 |
Powder classification is performed by air separation or sieving after cryogenic grinding. Equipment with a classifier rotor speed of 3,000–5,000 min⁻¹ and a grinding temperature below -100 °C is used to prevent particle coalescence during size reduction. The resulting powder must remain free-flowing; powder flow is measured by ISO 6186 to detect agglomeration or moisture-related bridging. Because polyamide powder is combustible, dust-handling equipment is designed to ATEX or NFPA 654 requirements. The powder is hygroscopic; storage at relative humidity above 60 % increases moisture pick-up and may require oven drying at 80–90 °C for 4–6 h to reduce bubble defects in the fused layer. Processors on production lines with fluidized-bed hoppers monitor dew point to avoid agglomeration and uneven feed.
In fluidized-bed immersion, the metallic workpiece is preheated to 250–350 °C and immersed for 2–10 s in a fluidized powder cloud. The porous plate in the fluidizing tank is typically a sintered metal or high-density polyethylene membrane with a bubble-point diameter below 20 µm. Fluidizing air is dried to a dew point below 10 °C and supplied at 0.5–2.0 bar; excessive air flow causes channeling and uneven film build. The heat capacity of the part determines the final thickness, with thin-wall components requiring lower preheat or shorter immersion. Batch-to-batch variance in powder particle size distribution across silo transfers can shift fluidization density; sieve analysis per ISO 8130-1 is therefore used after every transfer.
Electrostatic spray application operates at 40–80 kV corona gun voltage and 20–60 µA current, with the part grounded through the conveyor hanger. For black-pigmented powder, tribo-charging may also be used, but carbon black can reduce charge-to-mass ratio compared with natural polyamide powder. Cure is completed in a convection oven at 220–240 °C for 5–10 min after deposit; the film forms by particle coalescence at the melt state. Gel time by ISO 8130-6 is used as an incoming lot-control parameter. A significant shift in gel time relative to the certified value indicates moisture uptake or thermal history in the powder supply. Melt viscosity and surface tension control wetting of phosphated steel; excessive melt viscosity from under-heating produces orange peel and pinholing, while overheating reduces melt viscosity but increases oxidation risk.
Edge coverage on sharp corners remains a process limitation. Because the molten film shrinks during cooling, edges with a radius below 0.5 mm tend to show thinner coverage and are more susceptible to corrosion. Preheating to the upper end of the range improves wetting but may cause thermal degradation on small parts; infrared pyrometers are used to prevent surface temperature overshoot above 260 °C during preheat. Oven zone profiling is adjusted for part mass and conveyor speed to hold the substrate within the required cure window without exceeding the degradation threshold.
Adhesion on cold-rolled steel is controlled by substrate preparation before the powder is deposited. Zinc phosphate conversion coatings at 1.5–2.5 g/m² produce a microcrystalline layer that improves wet adhesion. Cross-cut adhesion after curing is evaluated by ISO 2409; classification 0 is expected on properly phosphated steel. Blasted steel with an Ra of 50–75 µm gives higher mechanical interlock but increases powder consumption and can create shadow zones that reduce coverage. Degreasing and rinsing must be complete because residual alkaline salts reduce adhesion and cause blistering during salt spray. Iron phosphate is a lower-cost alternative but provides lower wet adhesion than zinc phosphate; salt spray failures on iron-phosphated steel typically occur as underfilm filiform corrosion from a scribe, with creep values exceeding 5 mm at 1,000 h in some trials.
Film thickness for corrosion service is normally specified at 250–350 µm. Below 200 µm, the coating may not cover sharp edges sufficiently; above 500 µm, internal stress and cooling-rate gradients can produce shrinkage voids and reduce impact resistance. Falling-weight impact testing by ISO 6272-1 is used to detect over-thick or under-fused films. The AC additive system in T BLACK 7450 AC is formulated to maintain adhesion after moisture exposure; industrial coating trials with black-pigmented PA11 powders have shown no reduction in cross-cut classification after immersion in deionized water at 23 °C for 500 h. For exact performance values, the current technical data sheet and lot certificate should be consulted.
Neutral salt spray performance is assessed per ISO 9227 on zinc-phosphated steel panels coated at 250–350 µm. Standard laboratory panels with a scribe line through to the substrate typically report scribe creep below 3 mm after 1,000 h exposure. Results are highly dependent on edge geometry, phosphate coating weight, and cure temperature. Published data for the exact T BLACK 7450 AC grade in end-use installations is limited; these values derive from the general performance envelope of black PA11 coating powders on zinc-phosphated steel under laboratory conditions.
Chemical immersion testing per ISO 2812-1 demonstrates resistance to aliphatic hydrocarbons, diesel fuel, hydraulic fluids, and salt solutions. The coating is not recommended for continuous immersion in concentrated mineral acids, strong oxidizing agents, or phenol-containing solvents; these media cause polyamide chain scission, swelling, and adhesion loss. Abrasion resistance of fused PA11 films is evaluated by ASTM D4060 with CS-17 wheels and 1,000 g load. Black-pigmented PA11 coating films typically show Taber wear index values below 10 mg/1,000 cycles; values above 15 mg/1,000 cycles may indicate under-cure or excessive crystallinity. Flexibility is measured by cylindrical bend per ISO 1519-1; a film of 300 µm thickness is expected to withstand bending over a 10 mm mandrel without cracking.
For potable-water contact, compliance must be confirmed against the applicable national or regional standard; PA11 grades can be screened for extractables under FDA 21 CFR 175.300 or EU 1935/2004 depending on the end market. The AC additive package does not automatically confer potable-water certification, and the manufacturer should be consulted for grade-specific regulatory status.
Carbon black reduces surface resistivity compared with natural polyamide 11. Fused-film surface resistivity is measured by ASTM D257; natural PA11 films typically remain above 1012 Ω/sq, while carbon-black grades can fall into the static-dissipative range of 106–109 Ω/sq. This change affects electrostatic spray transfer efficiency. On corona-charging lines, the same voltage setting may produce a thicker deposit with black powder because the particle charge decays more quickly; operators adjust gun voltage and powder feed rate to avoid back-ionization craters in the film. Electrostatic spray equipment with a maximum gun voltage of 100 kV and current control to 100 µA is standard for these adjustments.
Deep recesses and interior corners are subject to the Faraday cage effect regardless of pigment. Controlled preheating of the part to 60–120 °C before cold electrostatic spray improves powder adhesion in recesses; preheating above 150 °C can cause premature melting on the gun tip and should be avoided. For parts with complex geometry, fluidized-bed dipping is preferred because the molten film forms directly from the hot substrate and does not rely on electrostatic forces. On production-scale electrostatic spray lines equipped with corona guns, humidity above 60 % reduces charging efficiency and increases powder clumping at the feed hopper; dehumidified booth air and fluidizing air are required for consistent film build.
In comparison with natural Rilsan fine powder grades, T BLACK 7450 AC provides black coloration without a secondary painting step and incorporates the AC wet-adhesion package. The carbon black pigment masks thermal discoloration but also hides early oxidation; therefore, cure temperature and residence time must be controlled within the specified range. Compared with PA12 powder coatings, PA11 has a higher melting point and is often selected when the service environment includes aliphatic hydrocarbon contact and mechanical abrasion. Compared with PA6 or PA66 powder systems, PA11 exhibits lower equilibrium moisture absorption, with values near 1.8–2.0 % in water at 23 °C by ISO 62, whereas PA6 can exceed 9 %. The lower moisture uptake reduces film swelling in humid environments and contributes to dimensional stability of coated parts.
Fused PA11 films from powder coating grades typically show Shore D hardness of 70–75 by ISO 868, tensile strength in the range 40–50 MPa by ISO 527-2, and elongation at break above 200 % by ISO 527-2. These values depend on cooling rate; water-quenched films are less crystalline and softer than slowly cooled films, while oven-cured films that cool in still air develop higher crystallinity and hardness. The film properties differentiate this thermoplastic powder from thermoset epoxy or polyester coatings, which cannot be remelted and require chemical or mechanical stripping for repair.
Process limitations include the minimum substrate temperature required for fusion. The material is unsuitable for wood, plastics, or low-melting alloys that cannot withstand the 220–240 °C cure window. It is also incompatible with amine-based liquid primers that may react with the polyamide melt; where a primer is required, the primer must be tested for adhesion and outgassing before full-scale production. For black parts exposed to strong ultraviolet radiation, the carbon black grade generally retains surface appearance better than natively pigmented colored powders, but the underlying polymer still benefits from topcoating in prolonged weathering service.
