| HS Code | 763370 |
| Product Name | Rilsan Fine Powders 6120 Warm White RDP 21 FB PA11 |
| Material | Polyamide 11 (PA11) |
| Color | Warm White |
| Density | 1.04 g/cm³ |
| Bulk Density | 0.45 g/cm³ |
| Melting Point | 186 °C |
| Glass Transition Temperature | 45 °C |
| Particle Size D50 | 40 µm |
| Tensile Strength | 40 MPa |
| Elongation At Break | 200 % |
| Shore D Hardness | 75 |
| Water Absorption 24h | 0.3 % |
As an accredited Arkema Rilsan Fine Powders 6120 WARM WHITE RDP 21 FB PA11 factory, we enforce strict quality protocols—every batch undergoes rigorous testing to ensure consistent efficacy and safety standards.
| Packing | Supplied as a 25 kg multi-ply paper bag of fine warm white PA11 powder, ready for coating applications. |
| Container Loading (20′ FCL) | 20′ FCL container loading of Arkema Rilsan Fine Powders 6120 Warm White, palletized bags secured safely for transport. |
| Shipping | Rilsan Fine Powder PA11 ships as a fine thermoplastic powder in sealed, moisture-resistant packaging. Keep dry, away from excessive heat and ignition sources. Use grounded equipment to prevent static accumulation. Standard freight handling is suitable; avoid crushing bags. No special hazardous shipping requirements for normal dry transport. |
| Storage | Store Arkema Rilsan Fine Powders 6120 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, which can affect powder flow and performance. Maintain temperatures below 25°C (77°F) and avoid exposure to humidity. Use within the manufacturer’s recommended shelf life and keep away from incompatible materials. |
| Shelf Life | Shelf life is typically 2 years from production date when stored in original, unopened packaging under dry, cool conditions. |
Arkema Rilsan Fine Powders 6120 WARM WHITE RDP 21 FB PA11 is applied on continuous fluidized bed lines where M8–M24 carbon steel or A4 stainless fasteners are conveyed through a gas-fired convection tunnel. The substrate temperature must exceed the PA11 melting endotherm measured at 183–187 °C by ASTM D3418-21; industrial preheat setpoints are typically 260–320 °C depending on thread mass and conveyor speed. Low preheat yields insufficient melt flow into thread roots, producing pinholes along the root-to-flank transition. Excessive preheat oxidises the warm white pigment and produces a yellow shift that is measurable with a spectrophotometer before physical failure occurs. The fluidization hopper must maintain compressed air dew point below -20 °C and powder temperature below 35 °C, because moisture uptake above 0.1 wt% causes micro-bubble formation during fusion. Blast cleaning to SA 2.5 per ISO 8501-1:2007 followed by zinc phosphating at 1.5–3.0 g/m² is the typical pretreatment; alkaline residues from cleaner drag-in are a common batch-to-batch cause of delamination. Immersion time is controlled between 1 s and 6 s by a pneumatic dipper, but the actual film thickness range of 150–400 µm is governed more by metallic heat capacity than by dip duration alone. Airflow through the porous polyethylene distribution plate is set at 30–60 m³/h per m² depending on bed density, and the bed is levelled after each shift to avoid dead zones. Published data for this specific warm white grade on A4 stainless is limited; salt spray verification per ISO 9227:2022 on production samples is used to confirm freedom from under-film creep beyond the first thread.
Dishwasher basket wire goods coated with the PA11 fine powder normally enter an electrostatic spray booth configured with corona-charged guns operating at 40–80 kV and powder flow rates of 100–200 g/min per gun. The warm white powder is reclaimed through a cyclone and sieved at 125 µm to remove fused agglomerates before reconditioning. Because wire intersections create Faraday cage shielding, fully automatic application lines frequently leave a thin band at the tangent point where two wires cross; robotic guns with short stroke reversal or tribo guns are used to reinforce these regions before the part enters the infrared and convection cure oven. The substrate must reach 220 ± 10 °C for 5–10 min to coalesce the powder into a continuous film; lower part temperature produces orange-peel and reduced adhesion, while higher temperature darkens the warm white colour and can generate amine-odour volatiles from thermal oxidation of the PA11 backbone. Film thickness on wire goods is specified between 200 µm and 350 µm, measured on witness plates or by cross-section microscopy per ISO 2808:2019. Food-contact approvals for PA11 are supported by FDA 21 CFR 177.1500(b) and EU Regulation 10/2011; compliance for a pigmented grade requires overall migration testing under EU 10/2011 Annex V because the warm white pigment dispersion must not elevate migration above 10 mg/dm². Adhesion is checked after a 68–72 °C detergent immersion cycle using cross-cut ISO 2409:2020; any flaking in the wire intersection zone indicates inadequate post-fusion time rather than detergent attack.
Small hollow chemical-dosing vessels and pump liners are occasionally rotomoulded from the same PA11 fine powder grade on biaxial machines operating with a minor-to-major speed ratio of 4:1 and oven air temperatures of 280–320 °C. The limiting variable is not oven setpoint but the internal air temperature measured inside the mould, which must remain between 220 °C and 240 °C for sufficient densification of the polymer against the mould wall. Below this range the warm white material retains powder boundaries and the part develops pinholes at the mould parting line; above it the material degrades, the melt viscosity decreases sharply, and uneven wall thickness occurs as melt slides down vertical walls. A nitrogen purge through the mould vent at 0.5–1.0 m³/h is used to suppress oxidative yellowing of the warm white pigment, because the same PA11 under air purge can shift colour by visual comparison against D65 illuminant panels. Wall thickness is typically controlled between 1.5 mm and 3.0 mm, with the lower bound set by melt strength and the upper bound by cycle time. Published data for this exact RDP 21 FB grade in rotomoulding is limited; screening on a pilot-scale shuttle machine is required after particle-size verification by ISO 13320-1:2020 because fine powder fluidity and bulk density affect mould filling. The main process conflict occurs with threaded metallic inserts: insert surfaces must be preheated independently to avoid a cold sink that prevents the PA11 from wetting the insert knurling. If the insert is not coated with a thin phosphate layer, thermal expansion mismatch during cooling causes circumferential cracking.
Underhood automotive tube and hose clamps are coated with the warm white PA11 powder after alkaline degreasing and zinc phosphating on rotary indexing machines. The coating provides both corrosion protection and a low-noise interface between the clamp band and rubber hose, reducing stick-slip during engine vibration. The preheat stage for this segment is tighter than for marine fasteners because the clamp band is thin and loses heat rapidly: oven exit temperature is held at 240–260 °C and transfer time to the powder cloud is kept below 3 s to prevent the surface temperature falling below the PA11 crystallisation point before fusion. Film thickness is maintained between 120 µm and 250 µm; heavier films crack at the band edge during crimping, while thinner films expose phosphate crystals and initiate cosmetic red rust under SAE J1455 cyclic exposure. Salt spray resistance is verified by ISO 9227:2022 on flat panels and finished clamps; zinc-phosphated mild steel with a 150–200 µm PA11 layer is commonly inspected for red rust after 720 h, though this acceptance depends on phosphate coverage in the radiused edges. Impact testing on curved clamp zones uses the ASTM D2794-93(2019) direct-impact method with a 1.0 kg indenter, but rounded geometry makes it difficult to obtain reproducible indentations; panel-level testing is more reliable. The warm white pigment increases hiding power but also makes latent damage visible as a bright surface mark, which is useful for in-line visual inspection. Lubricity of PA11 on rubber surfaces is measured indirectly as installation force; no single standard governs this parameter, and automotive OEM specifications define acceptable insertion force ranges for each clamp design.
Balustrade brackets, gate hinges, and exposed façade fixings in marine atmospheres are coated with the warm white PA11 powder as an alternative to post-galvanised polyester systems. The absence of a liquid primer means mechanical anchoring is the primary adhesion mechanism, and the specified surface profile must be reproduced on every batch. Angular chilled iron grit blasting is set to achieve Rz 40–70 µm per ISO 4287:1997 on stainless steel or carbon steel; smoother profiles produce intercoat shear failure within 12 months of coastal exposure, particularly where filiform corrosion initiates at cut edges. After blast cleaning, the substrate is preheated in a convection oven at 280–300 °C before dipping; the higher setpoint compensates for rapid heat loss from decorative open-section profiles. Coating thickness is specified as 250–400 µm across the visible face, with edge coverage of at least 150 µm. Ultraviolet stability of the warm white colour is assessed using ISO 4892-3:2016 UVA-340 lamps; project-specific acceptance often limits colour change to ΔE* ≤ 3.0 after 1,000 h and rejects any chalking below architect-defined Gloss 60° retention values. The main process conflict is thermal overshoot on narrow edges, which can produce a local film-thickness drop below the edge specification after capillary flow away from the edge. On production lines this is corrected by reducing preheat on visible faces or by using edge-shield fixtures that slow air movement across the component. Salt-laden coastal fog testing per ISO 9227:2022 is extended to 1,000 h for marine-grade architectural projects, with cut-edge creep limited to 2 mm.
Copper and aluminium busbars for stationary battery packs are coated with the PA11 fine powder in a fluidized bed or by electrostatic spray to provide a dielectric barrier and abrasion resistance during stack assembly. The critical coating region is the rectangular conductor edge, where electrostatic spray exhibits the same Faraday shielding problem as wire goods; fluidized bed deposition is preferred when the busbar cross-section is below 10 mm × 40 mm. Preheat temperatures are set between 250 °C and 300 °C, but the actual surface temperature before immersion must be confirmed with an infrared pyrometer because copper and aluminium differ in thermal diffusivity. Film thickness is specified in the range 200–400 µm, with the lower limit governed by ASTM D149-20 dielectric strength testing on flat specimens and the upper limit governed by heat dissipation requirements. Unfilled PA11 is often reported with dielectric strength between 15 kV/mm and 25 kV/mm depending on specimen thickness and conditioning; for this warm white pigmented grade, production witnesses are tested after 48 h at 50 °C because pigment dispersion can create microvoids that reduce breakdown voltage. The powder must be kept free of metallic fines from busbar handling, since aluminium dust contamination lowers volume resistivity and creates local dielectric weak points. Edge coverage is verified by sectioning at 5 mm from each end and measuring the film thickness over the radius; edge thickness below 100 µm is rejected. The application does not require electrical conductivity, and the PA11 coating must withstand 1,000 VDC hipot testing per customer specification after thermal cycling from -40 °C to 85 °C. Published data for this specific RDP 21 FB grade in busbar insulation is limited; qualification includes a full dielectric type test on finished busbar assemblies.
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Arkema Rilsan Fine Powders 6120 WARM WHITE RDP 21 FB PA11 is a polyamide 11 coating powder derived from 11-aminoundecanoic acid obtained from castor oil. The polymer repeat unit is −[NH−(CH₂)₁₀−CO]−, with bio-based carbon typically above 90% when assessed by ASTM D6866. The grade is supplied as a fine powder for electrostatic spray, fluidised-bed dipping, and electrostatic fluid-bed application. The term “Fine Powders” identifies a particle-size distribution controlled for coating processes, while “WARM WHITE” identifies a specific dry-blended pigment variant. The numerical code 6120 and the suffix RDP 21 FB are supplier-defined formulation and lot identifiers; they do not replace the batch certificate or a regulatory determination for a finished article. Generic PA11 property ranges include a density of 1.03–1.04 g/cm³ by ISO 1183-1 and a melting peak of 186–190 °C by ISO 11357-3. Grade-specific particle-size limits, moisture control, and cured-film performance must be confirmed against Arkema documentation.
Because pigment addition and fine grinding affect powder rheology, the material cannot be treated as an unfilled PA11 extrusion resin. Coating-powder characterisation follows selected methods from the ISO 8130 series. Particle-size distribution is checked by sieve analysis under ISO 8130-1, gel time by ISO 8130-6, and stoving loss by ISO 8130-7. Production coaters typically record the D50 and D90 from each batch certificate, since fines below 20 µm may reduce electrostatic transfer and increase back-ionization at sharp edges. The warm-white pigment package can shift melt viscosity relative to natural PA11; therefore, gel-time and levelling data from the same coloured lot are required for process characterisation.
| Property | Method | Typical or control range |
|---|---|---|
| Density of fused material | ISO 1183-1 | 1.03–1.04 g/cm³ |
| Melting peak | ISO 11357-3 | 186–190 °C |
| Particle-size D50 | ISO 8130-1 | Lot-specific; fine-powder grades typically controlled in 80–150 µm |
| Moisture content at application | ISO 15512 | ≤0.15% |
| Bio-based carbon | ASTM D6866 | ≥90% for the PA11 base polymer |
The melting peak of PA11 is approximately 10–15 °C higher than that of PA12. This elevates the minimum part preheat temperature and the oven set point but also supports a higher short-term thermal resistance. In fluidised-bed dipping, a PA11 powder may require part temperatures of 280–320 °C for light-gauge steel, while a PA12 powder may fuse at lower preheat. PA12 typically absorbs less water at saturation by ISO 62, with values near 1.5–2.0%, whereas PA11 may take up 2.5–3.5%. Selection of PA11 is therefore driven less by dimensional stability in wet environments and more by renewable feedstock, a higher melting peak, and the toughness of the resulting lining. When the specification cites hot-water immersion or condensation exposure, the higher crystallisation temperature of PA11 can reduce stress relaxation at elevated service temperatures, but the final decision requires comparative test data under EN 13501-1, ISO 6270-1, and ISO 9227.
Compared with epoxy and polyester/epoxy powder coatings, PA11 is a thermoplastic rather than a thermosetting system. The film does not crosslink; it fuses and crystallises. This distinction permits repair by reheating, but adhesion depends on mechanical anchoring and primer chemistry rather than covalent network formation. The absence of a cure exotherm simplifies oven control and reduces over-bake risk, although a minimum holding time above the melting temperature is still required to eliminate interface voids.
In production-scale corrosion-protection lines, dry-film thicknesses of 150–350 µm are common for PA11 linings on steel pipe fittings, valve bodies, and dishwasher baskets. The substrate is prepared to Sa 2½ per ISO 8501-1, followed by zinc phosphate or a chromate-free conversion layer before powder application. A corona spray system from Gema, Nordson, or Wagner is operated in a climate-controlled booth at 40–70% RH to limit moisture pickup. Manual touch-up is performed with a tribo gun where component geometry prevents corona wrap; however, transfer efficiency may be lower for warm-white pigmented powder because the inorganic pigment can shift charge-to-mass ratio. Powder charge and particle velocity should be verified with a powder-charge measurement instrument, and published data for this specific pigmented grade is limited. A shift in D50 greater than 15 µm relative to the qualified lot may change film thickness at identical gun settings.
After application, fusion and levelling take place in forced-air ovens. The part-metal temperature must reach the grade-specific cure index; for PA11 powders, typical time-temperature windows are 200–220 °C for 10–20 min. Thin parts reach the target faster, while cast or thick sections lag and require longer dwell. Cure is not a crosslinking reaction; extending dwell beyond the supplier maximum may not harden the film but can yellow the warm-white pigment and reduce impact toughness. Dry-film thickness is measured with ISO 2178 magnetic gauges on steel, and adhesion is checked by ISO 2409 cross-cut or ASTM D4541 pull-off. Salt-spray testing under ISO 9227 is frequently specified for 1,000–2,000 h on zinc-phosphated panels; however, published data for this specific grade is limited, and each pretreatment–coating system must be qualified independently.
Polyamide 11 is hygroscopic. At saturation, base resin water absorption is 2.5–3.5% by ISO 62, but coating powders are typically processed below 0.15% moisture. Above 0.20%, the powder may agglomerate on the porous plate of a fluidised bed, causing channelling and uneven film build. In electrostatic spray, moisture lowers charge retention and increases the tendency for powder to pack in the suction tube and pump. Pre-drying of virgin and reclaimed powder may be required when ambient relative humidity exceeds 60% or when the powder has been stored in an unheated warehouse. Desiccant drying at 80 °C for 4 h or at 60 °C for 8 h is typical for PA11 powders, but the exact profile depends on initial moisture and bed geometry. After drying, the powder should be transferred under dry air with a pressure dew point no higher than −40 °C. Water content should be verified by ISO 15512 with Karl Fischer titration before first use; moisture above 0.25% may require re-drying and re-testing.
Moisture acts as a plasticiser during fusion, lowering melt viscosity initially and then generating steam that leaves microvoids. The result is a film with lower gloss, reduced salt-spray resistance, and lower adhesion at the primer interface. On production-scale fluidised-bed lines, wet powder can also form crusts on the hopper walls and fluidisation plate, increasing cleaning frequency and producing particulate contamination in the cured film.
For food-contact uses, the fabricated article, not the powder alone, must comply with the applicable food-contact regulation. The PA11 base resin may be evaluated under FDA 21 CFR 177.1500 for polyamide repeat-contact articles and under EU Regulation 10/2011 with overall migration below 10 mg/dm². The FB suffix in the product designation must not be interpreted as a self-certification; extraction testing with the specific cured film thickness, substrate, and post-treatment is required. For industrial equipment, the coating system may be assessed for surface spread of flame under EN 13501-1 or ASTM E84, although published data for this specific warm-white grade is limited. Heavy-metal restrictions under RoHS Directive 2011/65/EU require verification that the warm-white pigment package does not introduce lead, cadmium, hexavalent chromium, or mercury above the permitted thresholds.
| Requirement | Relevant standard or regulation | Application condition |
|---|---|---|
| Particle-size distribution | ISO 8130-1:2019 | Lot-specific D50/D90 |
| Moisture content | ISO 15512 | ≤0.15% before application |
| Adhesion | ISO 2409 or ASTM D4541 | After dry-film thickness verification |
| Salt-spray resistance | ISO 9227:2022 | Panel-specific; commonly 1,000–2,000 h on zinc phosphate |
| Food-contact resin | FDA 21 CFR 177.1500 | End-article extraction testing |
| EU food-contact compliance | EU 10/2011 | Overall migration 10 mg/dm² |
| RoHS heavy metals | 2011/65/EU | Pigment compliance |
In fluidised-bed dip coating, the preheat temperature of the part controls both film thickness and adhesion. For thin steel sections, preheat temperatures of 280–320 °C are common for PA11; cast or thick sections may require 320–360 °C because the thermal mass cools rapidly after withdrawal from the oven. The usable immersion window is short: a 3 mm mild-steel sheet preheated to 300 °C may cool below the PA11 crystallisation onset within 15–25 s. Immersion time is therefore adjusted to part mass and surface area, typically 2–10 s for thin wire goods and 10–30 s for heavy fittings. The powder fuses from the substrate outward; if the surface temperature falls below the PA11 melt peak before the outer layer has coalesced, the film retains powder particles and exhibits low gloss and poor salt-spray resistance.
After withdrawal, residual heat is used to level the film. The part is held above the PA11 crystallisation temperature long enough for bubble release; forced-air circulation at 220–240 °C may be used for film thicknesses above 300 µm. Overheating above 380 °C for more than 120 s can yellow the warm-white pigment and embrittle the film. Cooling is then controlled to below 50 °C before stacking to prevent blocking and incidental adhesion. Because the thermal profile depends on substrate mass, rack density, and oven recovery rate, published data for this specific grade is limited; production trials on the actual part geometry are required to establish a repeatable preheat-immersion-cure sequence.
