| HS Code | 341387 |
| Material | Polyamide 11 (PA11) |
| Color | White |
| Density | 1.05 g/cm³ |
| Melting Point | 189 °C |
| Particle Size D50 | 21 µm |
| Bulk Density | 0.46 g/cm³ |
| Shore Hardness D | 75 |
| Tensile Strength | 45 MPa |
| Elongation At Break | 30% |
| Water Absorption 24h | 0.3% |
| Abrasion Resistance | Excellent |
| Chemical Resistance | Good to excellent against most solvents and weak acids |
As an accredited Arkema Rilsan Fine Powders WHITE RDP 21 FB PA11 factory, we enforce strict quality protocols—every batch undergoes rigorous testing to ensure consistent efficacy and safety standards.
| Packing | Arkema Rilsan Fine Powders WHITE RDP 21 FB PA11 is packaged in 25 kg sealed multi-layer bags, ensuring safe handling and storage. |
| Container Loading (20′ FCL) | 20′ FCL container loading of Arkema Rilsan Fine Powders WHITE RDP 21 FB PA11: 25 kg bags, palletized and wrapped, approx. 10,000 kg net per container. |
| Shipping | Arkema Rilsan Fine Powders WHITE RDP 21 FB PA11 is a fine polyamide powder shipped in sealed, moisture-resistant containers to preserve flowability. Avoid exposure to humidity, static discharge, and high temperatures. Handle with care to minimize dust generation; use grounding and protective equipment during transfer. |
| Storage | Store Rilsan Fine Powders White RDP 21 FB PA11 in its original, tightly sealed container in a cool, dry, well-ventilated area away from heat, open flames, and ignition sources. Protect from moisture and humidity to prevent caking. Avoid dust generation; keep containers closed when not in use. Follow standard powder handling practices and rotate stock to maintain shelf life. |
| Shelf Life | Store in dry, cool conditions in original sealed packaging. Shelf life is typically 2 years from manufacture date. |
Steel wirework intended for dishwasher baskets is first degreased and blasted to Sa 2½ (ISO 8501-1) with a surface profile of Rz 40–75 µm (ISO 8503-4). The Rilsan Fine Powders WHITE RDP 21 FB is applied in a fluidised-bed tank fitted with a porous sintered polyethylene plate; fluidising air pressure is maintained at 0.1–0.3 bar with a pressure dew point of ≤ −40 °C. Wire baskets are preheated in a forced-air convection oven to a peak metal temperature of 300–350 °C, then immersed for 3–8 s. The fine particle size distribution allows the powder to enter intersections of wire diameters from 3 mm to 6 mm. Film build after a single immersion is 250–500 µm, measured on wire surfaces by ISO 2178. After removal, residual heat completes melt coalescence; post-fusion is held at 190–210 °C for 3–6 min only when large baskets lose heat faster than the melt can level. Water quench follows to suppress discoloration. Adhesion is tested on wire coupons by ISO 2409 cross-cut and by ISO 6272-1 impact; the substrate profile, not chemical adhesion, dominates bond strength. Detergent exposure is evaluated by immersion in 0.5 wt% sodium tripolyphosphate solution at 60 °C for 100 h; acceptance is set by the appliance OEM. Published data for this specific grade under current detergent formulations is limited.
The limiting variable for cast pump bodies is thermal mass rather than powder composition. A cast iron volute with wall thickness 8–20 mm is preheated to 280–320 °C; the surface must remain above 186 °C during immersion, but internal cores may remain hotter and cause local melt sag. Immersion time is set at 4–10 s for a target film of 300–600 µm. Angular grit blasting to Sa 2½ (ISO 8501-1) and a profile of Rz 50–90 µm are required for mechanical anchoring. The fluidising air must be dry, ≤ −40 °C pressure dew point, to avoid hydrolysis during fusion. Thickness is measured on flat and curved surfaces by ISO 2178, and internal bore coverage is checked with a borescope. Typical conflicts are edge pull-back at sharp flange radii below 2 mm and bridging in tapped holes; these are controlled by pre-coat masking or by preheating adjustment. Post-fusion at 190–210 °C for 5–10 min is applied to eliminate craters. The absence of a crosslinking reaction means over-baking does not increase network density, but held above 220 °C thermal degradation starts to shift colour and reduce impact resistance. Scribe creep after 1000 h ISO 9227:2022 neutral salt spray is specification-dependent; published data for this configuration is limited.
| Cast wall thickness | Preheat peak metal temperature | Immersion time | Film build after post-fusion |
|---|---|---|---|
| 3–5 mm | 300–340 °C | 3–5 s | 250–400 µm |
| 5–10 mm | 290–320 °C | 5–8 s | 350–500 µm |
| 10–20 mm | 280–310 °C | 8–12 s | 450–600 µm |
For copper and aluminium busbars in low-voltage switchgear, Rilsan Fine Powders WHITE RDP 21 FB is applied after degreasing and light alumina grit blasting. The powder is sprayed at 60–100 kV corona charging to a cold metal part, then fused at 190–210 °C peak metal temperature for 5–10 min. Edge coverage on rectangular cross-sections is controlled by lowering gun voltage and increasing powder output; sharp edges below 0.5 mm radius cause electrostatic starvation. Dielectric testing is performed by spark tester at 3–5 kV for a 300–600 µm film; a continuous film without holidays is the acceptance criterion. The coating contributes insulation efficiency but is not a substitute for creepage and clearance distances defined by IEC 60664-1. Water absorption below 2.0 % by ISO 62 limits dimensional swelling in humid enclosures. Salt mist exposure per ISO 9227:2022 is used to qualify corrosion resistance on copper. Published dielectric strength values for the specific white grade should be taken from the supplier technical datasheet.
In electrostatic spray coating of stamped steel seatbelt guides, springs, and latch components, film thickness is held at 150–300 µm using corona guns operating at 60–90 kV and powder hose pressure 0.5–1.2 bar. Substrate preparation is alkaline degreasing followed by zirconium passivation or thin phosphate conversion coating, with a final rinse conductivity ≤ 30 µS/cm. The powder is sprayed onto cold parts, then fused at 190–210 °C for 3–8 min in a gas-fired convection oven. Film thickness is measured on curved surfaces by ISO 2178. The main production failure mode is Faraday-cage penetration in small springs with coil gaps below 2 mm; this is addressed by lowering gun current to 10–20 µA, increasing air flow, and preheating parts to 60–80 °C. Abrasion resistance is evaluated by ASTM D4060 with CS-17 wheels, 1000 g load, for 1000 cycles; acceptance thresholds are OEM-defined. Powder storage must remain below 60 % relative humidity to prevent clumping in the hopper; exposed material is dried at 80 °C for 2 h before use.
When dry food processing equipment requires a non-epoxy polymer barrier, Rilsan Fine Powders WHITE RDP 21 FB is applied to cast aluminium or stainless steel mixer components by electrostatic spray at 40–70 kV or by electrostatic fluidised bed. Stainless steel is degreased and blasted with clean aluminium oxide; aluminium is given a chromate-free conversion coating. Film thickness is maintained at 200–400 µm to avoid cracking when parts are brushed or scraped. Curing is fusion-only at 190–205 °C; no crosslinking reaction occurs. Contact compliance is assessed under FDA 21 CFR 177.1500 and EU Regulation 10/2011 as applicable to polyamide 11. Migration testing is carried out under EU 10/2011 with food simulants; published extraction data for this specific white grade is limited. Dry chemical resistance to flour dust, sugar, and cleaning agents is validated by ISO 2812-1 spot tests. The absence of a crosslinked network provides post-cure flexibility but limits upper service temperature to 70–90 °C continuous immersion, depending on load.
| Requirement | Standard / test method | Condition |
|---|---|---|
| Resin compliance | FDA 21 CFR 177.1500 | Polyamide 11 |
| Overall migration | EU 10/2011 | Food simulant |
| Dry film thickness | ISO 2178 | Magnetic substrate |
| Blast cleanliness | ISO 8501-1 | Sa 2½ |
| Chemical spot resistance | ISO 2812-1 | 24 h / 20 °C |
On marine deck hardware, the fluidised-bed immersion cycle begins with mild steel blasted to Sa 2½ (ISO 8501-1) or stainless steel blasted with fresh aluminium oxide and passivated per ASTM A967. Parts are preheated to 290–330 °C, immersed 6–12 s, and post-fused at 190–210 °C for 5–8 min. Target film thickness is 350–700 µm on hinge plates, handrail brackets, and cleats. Sharp corners below 1 mm radius lead to edge pull-back; the acceptance standard is NORSOK M-501 for offshore coating systems where specified. Salt spray testing is per ISO 9227:2022; seawater immersion is per ISO 2812-2. The white pigmentation limits solar heat build-up, but long-term gloss retention in marine UV requires top-coating; published data for this grade under marine UV is limited. Holiday detection is performed at 3 kV for a 500 µm nominal film.
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Arkema Rilsan Fine Powders WHITE RDP 21 FB PA11 is a polyamide 11 powder grade developed for thin-to-medium film coating of metallic substrates by electrostatic spray and fluidized-bed immersion. The product belongs to the Rilsan Fine Powders range, where the designation RDP identifies a fine powder and the suffix 21 FB denotes the white-pigmented variant. The polymer is synthesized from 11-aminoundecanoic acid derived from castor oil; the resulting eleven-carbon aliphatic segment between amide groups provides a balance of low moisture uptake, impact resistance, and chemical resistance distinct from shorter-chain polyamides. Publicly available data for the exact RDP 21 FB grade is limited; representative values in this text are drawn from the Arkema Rilsan Fine Powders PA11 family and from ISO 11357-3, ISO 1183-1, ISO 62, and ISO 13320 test methods. They must be confirmed against the current commercial datasheet and lot certificate for the specific grade.
The melting endotherm of PA11 fine powder measured by differential scanning calorimetry according to ISO 11357-3 is typically observed between 186 °C and 189 °C, with crystallization onset on cooling near 150 °C to 160 °C depending on cooling rate. This melting point places RDP 21 FB above PA12 coating powders, which melt near 176 °C, and below PA6 or PA66 powders, which melt above 220 °C. Solid-state density of unfilled PA11 is approximately 1.04 g/cm³ per ISO 1183-1; white-pigmented grades may show slightly higher density because of the inorganic opacifier package. Water absorption at saturation in deionized water at 23 °C is approximately 1.8 % to 1.9 % by mass when tested to ISO 62. This is below the saturation uptake of PA6 or PA66 and moderately above typical PA12 values. The low water uptake helps maintain dimensional stability and adhesion when the coating is exposed to humid conditions or intermittent water contact.
| Property | Test method | PA11 Rilsan Fine Powders family representative | PA12 fine powder typical |
|---|---|---|---|
| Melting peak | ISO 11357-3 | 186–189 °C | 176–178 °C |
| Density | ISO 1183-1 | 1.04 g/cm³ | 1.01–1.03 g/cm³ |
| Water absorption at saturation, 23 °C | ISO 62 | 1.8–1.9 % | 1.4–1.6 % |
| Particle size D50 for fine coating grades | ISO 13320 | 30–45 µm typical range, grade-controlled | 30–50 µm typical range, grade-controlled |
The particle-size specification is critical because it controls transfer efficiency and minimum achievable film thickness. Powders with a D10 below 10 µm can exhibit reduced flow, dusting, and gun spitting; materials with a D90 above 80 µm may not form films below 150 µm in electrostatic spray. The actual D10, D50, and D90 for RDP 21 FB are lot-controlled and printed on the certificate of analysis. The white opacifier package is not disclosed in public literature but is typically titanium dioxide–based; it can alter powder resistivity, particle-charging rate, and infrared absorption relative to natural PA11 grades. No single property should be used to approve a lot without reviewing the full certificate and the intended coating line.
In production-scale electrostatic spray lines, the powder is conditioned in a fluidized hopper, metered by venturi or dense-phase pumps, and charged by corona electrodes operating between 30 kV and 100 kV depending on booth configuration and part geometry. The grounded metal substrate is either preheated for hot flocking or the powder is applied to ambient parts and then fused in a convection oven. For fluidized-bed immersion, the part is preheated to 250 °C to 350 °C and dipped into the fluidized powder for a controlled dwell time. Film thickness for PA11 coatings produced by fluidized-bed immersion typically ranges from 150 µm to 500 µm, while thin electrostatic spray films may be deposited below 150 µm. The white pigmentation in RDP 21 FB can reduce infrared absorption compared with dark or natural powders; therefore oven setpoints and line speeds for white RDP 21 FB may require empirical adjustment against a production reference. Published data for the optimum preheat shift in this specific grade is limited, so production trials are required to establish the setpoint.
Substrate preparation is a control point. Carbon steel parts for salt-spray service are typically degreased, blasted to a surface profile of Sa 2½ according to ISO 8501-1, and often primed with an epoxy or zinc-rich primer before PA11 powder application. The primer prevents underfilm corrosion and improves moisture resistance. Without a primer, the PA11 coating can still provide dielectric and abrasion protection, but long-term neutral salt-spray resistance to ISO 9227 is highly dependent on film thickness, edge coverage, and surface cleanliness.
Application sectors that use white RDP 21 FB include dishwasher baskets, wire goods, valve bodies, pump housings, automotive fluid-contact clips, and outdoor furniture. These applications exploit the PA11 balance of abrasion resistance, hydrocarbon resistance, and impact resistance. For white parts, the grade reduces the need for a separate topcoat to achieve uniform whiteness; however, the cured film gloss and color stability must be measured to ISO 2813 and ISO 7724 because white PA11 can show gloss reduction after abrasion or extended UV exposure. UV stabilization is formulation-specific and should be confirmed if the part is intended for outdoor service.
PA11 and PA12 both belong to the aliphatic polyamide family used in fine-powder coating, but their thermal and chemical profiles differ. RDP 21 FB melts at 186 °C to 189 °C, while PA12 melts near 176 °C; this provides a wider margin before heat softening in hot-fluid immersion service. PA12 has slightly lower water absorption and density, but PA11 has a higher melting point, higher stiffness at elevated temperature, and a high renewable carbon content. Unmodified PA11 can have a bio-based carbon content above 90 % when measured by ASTM D6866; white-pigmented RDP 21 FB has a lower bio-based carbon fraction because of the inorganic pigment mass. The white pigmentation also provides higher hiding opacity than natural PA11 or unpigmented PA12, which can reduce the number of layers or coating thickness required for uniform white coverage.
Compared with PA6 and PA66, RDP 21 FB exhibits lower saturation water absorption, which reduces film swelling and preserves adhesion in humid environments. PA6 and PA66 can absorb between 7 % and 9 % water at saturation by ISO 62; this creates greater dimensional disturbance and can produce stress at the coating–substrate interface. PA6 and PA66 have higher melting points, but their melt-processable powder coating formulations are not directly interchangeable with PA11 because of different substrate preheat temperatures and moisture sensitivity. Relative to epoxy thermoset coating powders, PA11 RDP 21 FB is a thermoplastic. It has no pot-life constraint, can be re-melted and re-coated, and offers high impact and abrasion resistance. Epoxy systems may provide better adhesion to bare steel and better resistance to strongly polar solvents, but they cannot be re-melted and are more likely to embrittle under impact.
When the target film thickness is below 150 µm, electrostatic charging and powder rheology interact in ways that are often lot-dependent. In corona charging, fine particles can accept a higher charge-to-mass ratio than coarse particles, but particles below approximately 10 µm may become trapped in the powder cloud and reduce overall transfer efficiency. For RDP 21 FB, the white opacifier increases powder resistivity relative to carbon-black-loaded or metallic powders; if resistivity exceeds the range of approximately 1013 Ω·m to 1015 Ω·m, back-ionization on the substrate can occur, producing pinholes and orange-peel texture. The exact resistivity boundaries for this grade are not published; production-scale corona booths must map gun voltage, powder output, and relative humidity against cured-film appearance. The same powder can deposit differently on a hot-dipped galvanized bracket than on a thick steel valve body because of differences in thermal mass and grounded surface resistance.
Compliance for a white-pigmented PA11 fine powder is formulation-specific. The base PA11 resin may fall under FDA 21 CFR 177.1500 for nylon resins when the extraction limits for the intended food type and time–temperature conditions are met. In the European Union, plastic food-contact materials are assessed under Regulation (EU) No 10/2011, which specifies an overall migration limit of 10 mg/dm² for plastic materials and articles. A pigmented powder requires additional verification of the white pigment, stabilizers, and any processing aids against the positive list and migration limits. For potable-water contact, approvals such as NSF/ANSI/CAN 61, ACS, and Regulation 31 are product- and formulation-specific; they should not be assumed for every RDP 21 FB application.
| Regulation or standard | Scope and relevant limit | Typical status for PA11 fine powders |
|---|---|---|
| REACH Regulation (EC) No 1907/2006 | SVHC disclosure and authorization; 0.1 % w/w SVHC threshold for articles | Product-specific statement required |
| RoHS Directive 2011/65/EU | Pb 0.1 %, Hg 0.1 %, CrVI 0.1 %, Cd 0.01 % | Applies to the coated article; powder alone not an EEE |
| FDA 21 CFR 177.1500 | Nylon resins for food contact; extraction limits apply | Base resin may comply; pigment and additives separate |
| Regulation (EU) No 10/2011 | Overall migration limit 10 mg/dm² | Full formulation verification required |
| NSF/ANSI/CAN 61 | Potable water contact | Grade-specific listing required |
Storage of RDP 21 FB should follow the same moisture-control discipline as other polyamide 11 fine powders. Containers should remain sealed and stored below 30 °C in a dry area. Partially used containers should be purged with dry air or resealed with desiccant sachets to prevent moisture regain. The powder should not be mixed with other polymer powders or with reclaimed powder from the coating booth unless the blend is validated for particle-size distribution, melt flow, and whiteness. White RDP 21 FB may be more sensitive to visible yellowing when exposed to oven temperatures above 240 °C for extended times; this limitation is operational and does not imply degradation at normal fusion temperatures of 190 °C to 230 °C. If processing lines use recycled overspray, the reclaimed fraction should be limited to the percentage specified by Arkema and the booth filtration efficiency should be monitored to keep fine-particle enrichment and substrate contamination within the lot certificate.
