| HS Code | 538556 |
| Product Name | Arkema Rilsan Fine Powders WHITE RDP 21 ES PA11 |
| Chemical Basis | Polyamide 11 (PA11) |
| Color | White |
| Physical Form | Fine powder |
| Particle Size D50 | Approximately 50 microns |
| Apparent Density | 0.35 - 0.45 g/cm³ |
| Specific Gravity | 1.04 g/cm³ |
| Melting Point | 186°C |
| Tensile Strength | 46 MPa |
| Elongation At Break | >300% |
| Flexural Modulus | 950 MPa |
| Izod Impact Strength Notched 23 C | 40 kJ/m² |
| Moisture Absorption 24h Immersion | 0.9% |
| Vicat Softening Point | 170°C |
As an accredited Arkema Rilsan Fine Powders WHITE RDP 21 ES PA11 factory, we enforce strict quality protocols—every batch undergoes rigorous testing to ensure consistent efficacy and safety standards.
| Packing | White PA11 fine powder supplied in 25 kg bags, suitable for fluidized bed coating and electrostatic spraying. |
| Container Loading (20′ FCL) | 20′ FCL loaded with Arkema Rilsan Fine Powders WHITE RDP 21 ES PA11; packages secured, dry, ventilated, and protected from moisture. |
| Shipping | Shipping description: Arkema Rilsan Fine Powders WHITE RDP 21 ES PA11 (polyamide-11 powder). Not classified as dangerous goods for transport. Pack in moisture-resistant sealed containers, palletized and secured. Avoid creating dust clouds; keep away from ignition sources. Transport dry, protected from contamination. Handle with care to prevent bag damage. |
| Storage | Store in a cool, dry, well-ventilated area, away from heat, open flames, and direct sunlight. Keep the original container tightly sealed to prevent moisture absorption, which can affect powder flow and performance. Maintain temperatures below 25°C. Use within recommended shelf life; avoid exposure to humidity and incompatible materials. |
| Shelf Life | Shelf life is approximately 2 years when stored unopened in original packaging, in a cool, dry place. |
Replacement of solvent-borne nylon 11 topcoats on forged carbon steel ball-valve bodies with Arkema Rilsan Fine Powders WHITE RDP 21 ES PA11 proceeds through an electrostatic spray deposition sequence in which cleaned substrates are pre-heated to 220–280°C and the powder is charged at 60–100 kV using reciprocating guns positioned at 250–350 mm from the surface. The powder itself is applied as 100 wt% of the dry topcoat; if a zinc-rich epoxy primer is specified, the primer contributes 50–75 µm to total system build while the PA11 layer is maintained at 250–350 µm. Downstream process steps include abrasive blasting to ISO 8501-1 Sa 2½, zinc phosphating to ISO 9717, electrostatic spraying, and post-fusion in a convection oven at 190–200°C for 2–4 min. Neutral salt spray resistance is verified under ISO 9227:2017 at 5 wt% NaCl for 1,000 h with maximum scribe creep of 2 mm. Production-scale field observations indicate that powder moisture above 0.4 wt% in the feed hopper, typical when silo storage relative humidity exceeds 60%, reduces first-pass transfer efficiency and produces orange-peel on valve body necks; hoppers are therefore pre-dried at 80°C for 4 h and supplied with desiccated air at a dew point below -20°C. Service exposure is not recommended for continuous immersion in concentrated hydrochloric acid above 40°C. Terminal products in this segment are ball-valve bodies, butterfly-valve discs, and pump volutes exposed to mild chemical process atmospheres.
For automotive connector shells and brake-line fittings with recessed windows, electrostatic application of Rilsan WHITE RDP 21 ES must overcome Faraday cage effects that prevent charged powder from entering blind pockets. The powder is applied at 100 wt% of the dry-film formulation; when e-coat or zinc-flake base layers are used, those contribute 10–20 µm while the PA11 topcoat is controlled to 200–300 µm. Production-scale booths for these parts use guns operated at 60–80 kV, reduced to 45–60 kV for internal bores, with powder delivery at 80–120 g/min per gun and part rotation at 3–5 rpm during the gel phase. Post-fusion is conducted at 190–200°C for 3–5 min in a box oven. Compliance for OEM supply includes PPAP documentation under IATF 16949, stone-chip resistance tested to SAE J400 with chip length not exceeding 2 mm, and corrosion resistance according to ISO 9227. Field data on multi-gun lines indicate that excessive fines below 40 µm in recovered powder raise dust accumulation at booth corners and cause thick bridging across connector socket openings; maintaining 30–50 wt% fresh powder addition limits fines accumulation. Terminal products are automotive connector shells, brake-line clips, and wiring harness retainers.
| Application segment | Substrate and pre-treatment | Powder addition in dry film | Pre-heat range | Post-fusion | Target dry-film thickness | Primary test reference |
|---|---|---|---|---|---|---|
| Steel valve bodies | Carbon steel, ISO 8501-1 Sa 2½ + ISO 9717 zinc phosphate | 100 wt% of topcoat; primer 50–75 µm | 220–280°C | 190–200°C / 2–4 min | 250–350 µm | ISO 9227 |
| Automotive connector shells | E-coated or zinc-flake steel, base layer 10–20 µm | 100 wt% of topcoat | 200–260°C | 190–200°C / 3–5 min | 200–300 µm | SAE J400, ISO 9227 |
| Food-processing conveyor rails | Stainless or mild steel, degreased and abrasively cleaned | 100 wt% of topcoat; no primer | 200–240°C | 185–195°C / 3 min | 150–250 µm | FDA 21 CFR 177.1500, EU 10/2011 |
| Pneumatic cylinder end caps | Cast aluminium, chromate/chromium-free conversion layer 3–8 µm | 100 wt% of topcoat | 240–270°C | 185–190°C / 5 min | 225–325 µm | ISO 2409, ASTM D2794 |
| Filter housings | Cast aluminium, alkaline degreased, chromium(III) conversion coating | 100 wt% of topcoat; porosity primer where needed | 220–250°C | 190–195°C / 4 min | 300–400 µm external | ASTM B117, ASTM D4060 |
| Retail fixtures | Recycled steel, ISO 8501-1 Sa 2½ | 100 wt% of topcoat; no primer | 230–260°C | 190–200°C / 3–4 min | 250–350 µm | REACH Article 33, RoHS 2011/65/EU |
Food-processing conveyor guide rails and bottle-handling chutes are coated with the powder at 100 wt% of the topcoat onto stainless steel or mild steel that has been degreased and abrasively cleaned. Dry-film thickness is held at 150–250 µm so that moving-chain clearances are not consumed. Substrate pre-heat in this application is normally 200–240°C; lower temperatures are used on thin-gauge sheet to prevent thermal distortion. After spraying, the coating is fused at 185–195°C for 3 min. Food-contact suitability for the finished component must be established under FDA 21 CFR 177.1500 and EU Regulation (EU) No 10/2011, with overall migration testing performed to EN 1186-1 where wet or fatty contact occurs. Published data for the specific RDP 21 ES grade in high-acid citrus processing environments is limited; qualification is performed on the finished component rather than on generic resin alone. Terminal products include conveyor guide rails, bottle-handling scrolls, and dry-food chute liners.
Conversion from solvent-borne nylon lacquers on aluminium pneumatic cylinder end caps to Rilsan WHITE RDP 21 ES PA11 dry powder requires a shift in substrate preparation and thermal loading. The powder is applied as 100 wt% of the dry coating; chromate or chromium-free conversion layers contribute 3–8 µm of pre-treatment film, and the PA11 topcoat is maintained at 225–325 µm. Cast aluminium components are pre-heated to 240–270°C, sprayed with guns operating at 60–80 kV, and fused at 185–190°C for 5 min in a convection oven. Cured parts are evaluated for adhesion under ISO 2409 with classification ≤1, reverse impact under ASTM D2794 at 1.5 J without cracking, and salt spray under ISO 9227 for 720 h. Process limits observed on production lines include local film thinning below 200 µm on sharp port threads and discoloration of cast aluminium when pre-heat exceeds 270°C for more than 6 min. The terminal products are pneumatic cylinder end caps, solenoid-valve manifolds, and compressed-air filter bowls.
In coastal HVAC installations and water-treatment plant rooms, cast aluminium filter housings are electrostatically coated with RDP 21 ES as the 100 wt% dry topcoat after alkaline degreasing and chromium(III) conversion coating. The dry-film thickness of the PA11 layer is set at 300–400 µm on external faces and 200–250 µm on internal fins where clearance is constrained. Pre-heat for cast aluminium is controlled to 220–250°C to prevent outgassing from porous castings; pores are sealed with a powder-coated primer where porosity exceeds class 2 under ASTM E505. Post-fusion is performed at 190–195°C for 4 min. Neutral salt spray per ASTM B117-19 is used for incoming inspection at 1,000 h, with maximum scribe creep of 3 mm. Abrasion resistance is checked under ASTM D4060 using CS-17 wheels at 1,000 g load; acceptable mass loss is below 20 mg after 1,000 cycles. Continuous immersion in strong oxidising acids above 50°C is outside the validated operating envelope. Terminal products are cast aluminium filter housings, HVAC damper bodies, and coastal electrical enclosure covers.
Retail fixture OEM documentation packages concerning recycled steel substrates process RDP 21 ES at 100 wt% of the coating film. A base powder or adhesive primer is not required when the substrate is blast-cleaned to ISO 8501-1 Sa 2½ and pre-heated to 230–260°C. The dry-film thickness is specified at 250–350 µm on flat surfaces; cut edges below 150 µm are acceptable only if crevice corrosion is excluded by design. After powder application, parts are cured at 190–200°C for 3–4 min and cooled under forced air to below 50°C before packaging. Compliance requires REACH Article 33 communication for SVHC content above 0.1 wt% and RoHS 2011/65/EU verification where fixtures contain electronic components. Field data from multi-line production shows that the main source of rejects is not fusion but electrostatic wrap on internal corners of folded steel panels; gun voltage above 85 kV increases back-ionisation and pinhole formation on thin-gauge sheet. Terminal products are point-of-sale display arms, shelving brackets, and retail furniture frames.
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Arkema Rilsan Fine Powders WHITE RDP 21 ES PA11 is a white-pigmented polyamide 11 coating powder supplied as a fine-particle material for electrostatic spray and fluidized-bed coating operations. The base polymer is polyamide 11, a long-chain aliphatic polyamide derived from castor oil. Cured films of the base resin typically exhibit a melting peak between 183–187 °C when analysed by ISO 11357-3 and a density of 1.03–1.05 g/cm³ when measured by ISO 1183-1. The product code RDP 21 ES denotes an electrostatic-spray-grade powder; the final particle-size distribution and moisture content are controlled on the batch certificate and should not be inferred from generic Rilsan Fine Powders literature. In contrast to dry-blended pigments, the white pigmentation is melt-compounded into the polymer matrix, which reduces colour segregation in the fluid bed but requires revalidation of transfer efficiency and cure conditions.
| Property | Typical value | Test method |
|---|---|---|
| Melting peak | 183–187 °C | ISO 11357-3 |
| Density | 1.03–1.05 g/cm³ | ISO 1183-1 |
| Tensile yield strength | 38–42 MPa | ISO 527-1/-2 |
| Tensile modulus | 1.1–1.3 GPa | ISO 527-1/-2 |
| Water absorption at saturation | 1.6–2.0 % | ISO 62 |
Particle-size control is a primary process variable. In corona-charging electrostatic spray systems, charge acceptance and transfer efficiency depend on particle diameter, surface moisture, and the electrical resistivity of the powder. Excessive fines below 10 µm can produce powder dusting and low deposition efficiency, while coarse particles above 150 µm can increase orange peel and reduce hiding at thin film builds. For WHITE RDP 21 ES, the batch certificate should list D50 and D90 values by laser diffraction, measured according to ISO 8130-1 or ISO 13320-1. Fluidization behaviour of the powder-air mixture can be assessed by ISO 8130-5, and the outcome is sensitive to the dew point of the air supplied to the hopper and fluidizing membrane.
Polyamide 11 absorbs water reversibly from ambient air. At 23 °C and 50 % RH, the equilibrium moisture content of PA11 is approximately 1.1–1.5 %. Above 60 % RH, surface moisture can increase powder cohesiveness, lower charge-to-mass ratio, and cause bridging in feed hoppers. In plants without humidity control, powder conditioning is recommended with dried compressed air having a dew point below −40 °C. If bags have been opened in ambient air above 60 % RH for more than a few hours, pre-drying at 60–80 °C for 2–4 h in a desiccant dryer or vacuum dryer is commonly required before electrostatic application. The white pigmentation makes moisture agglomeration visible as mottling or streaks in the cured film, and transfer efficiency may fall more sharply than in unpigmented powder because the pigment particles modify moisture uptake at the powder surface.
Cryogenically ground polyamide powders contain irregular angular particles that can interlock and produce hopper bridging. The ES-grade conditioning may include particle rounding or dry-flow additives at concentrations below 0.5 wt% to improve fluidization without introducing excessive organic volatiles during cure. A pressure drop across the fluidizing membrane of 5–15 mbar is typical for fine polyamide powders, but the exact setting depends on hopper geometry and powder level. During film formation, the deposited powder passes through sintering and melt coalescence. PA11 has sufficiently low melt viscosity at 220–250 °C to level into a continuous film. Below 220 °C, incomplete particle fusion can leave microporosity that reduces gloss and creates pathways for moisture or salt. The white pigmentation highlights microporosity as a loss of hiding power; cure validation should therefore include cross-sectional microscopy or dye-penetrant inspection after one bake cycle. Gloss can be quantified by ISO 2813, and adhesion by ISO 2409:2013.
In recessed holes, internal corners, and wire intersections, Faraday-cage shielding limits powder transport. Reducing gun voltage, increasing gun-to-part distance, or using deep-reach nozzles can improve penetration, but no electrostatic powder can completely compensate for inaccessible geometry. Edge coverage should be inspected with dry-film thickness measurement according to SSPC-PA 2 or ISO 2808. For corrosion protection on edges, a minimum dry film thickness of 200–250 µm is frequently specified, but the threshold should be established by salt-spray exposure per ISO 9227:2017 and cyclic corrosion testing. Thin edge coverage may not be visible until the part has been in service or tested under corrosive conditions.
The substitution is not limited to colour adjustment. Titanium dioxide pigmentation changes the electrical resistivity and charge-retention behaviour of the powder layer. A line operating a black PA11 powder at 100 kV may develop back-ionization with the white grade at the same voltage, producing pinholes and rough film. The operator should begin at lower voltage and increase in steps until coverage is achieved, then confirm transfer efficiency by measuring film thickness on the first production parts. The white film may also require a slight adjustment of oven dwell because pigment loading influences melt viscosity during coalescence. Cross-cut adhesion is evaluated by ISO 2409:2013, impact resistance by ISO 6272-1:2011, and colour drift by spectrophotometric ΔE under ISO 11664-4. Over-curing above 250 °C can produce yellowing in white PA11, although the PA11 backbone is comparatively stable against thermal discoloration.
Within the Rilsan Fine Powders portfolio, grades are separated by particle-size band, melt-viscosity control, and colour chemistry. The RDP 21 ES white grade is melt-compounded rather than dry-blended, which yields a more uniform appearance and prevents colour segregation during fluid-bed application. Dry-blended pigments can accumulate at the top of a fluidized bed or in reclaim lines, causing colour streaks and shifts in ΔE. The trade-off is that melt-compounded pigment changes the rheology of the powder and may reduce the maximum permissible reclaim ratio because repeated heat history can shift white colour. Users should monitor colour drift with a spectrophotometer using CIELAB coordinates and an agreed ΔE limit, for example ΔE below 1.5 under ISO 11664-4. This is an operational control point rather than an absolute product specification.
For ferrous substrates, blast cleaning to ISO 8501-1:2007 Sa 2½ with an angular profile of 40–75 µm is the usual minimum for mechanically demanding coatings. On aluminium, a chromate conversion coating or a chromium-free alternative following ISO 8081 improves adhesion and filiform corrosion resistance. Alkaline degreasing at 60–80 °C removes drawing compounds, oils, and greases. For electrostatic spray, parts may be coated cold and then heated, but fluidized-bed application requires preheating to 260–320 °C depending on part mass. The part is then immersed in the fluidized powder bed; thickness is controlled by metal temperature, dwell time, and withdrawal speed. After coalescence, oven cure is typically conducted at 220–250 °C for 3–10 min depending on part mass and line speed. Actual metal temperature should be monitored with in-metal thermocouples because oven air temperature alone is not sufficient. Adhesion after water immersion can be checked by cross-cut per ISO 2409, and blistering is rated by ISO 4628-2.
In fluidized-bed coating, the bath is typically held in a stainless-steel vessel with a porous membrane. Dry compressed air at 0.2–1.5 bar is admitted below the membrane to expand the powder bed. The preheated part is dipped for 2–10 s depending on required thickness; excess powder is removed by shaking or air blast. Residual heat fuses the powder, after which the part enters a post-heat oven. Because white RDP 21 ES has lower visual tolerance for contamination, the fluid bed should be cleaned between colour changes and checked for scorched polymer specks. Sieving of reclaimed powder through 150 µm or finer mesh is common to prevent agglomerates from entering the bed.
Chemical resistance of the cured coating follows the general behaviour of polyamide 11: good resistance to aliphatic hydrocarbons, oils, greases, fuels, and many solvents; limited resistance to strong acids, phenol, formic acid, and strong oxidizing media. Immersion service must be confirmed on cured coupons because the coating process alters crystallinity and permeability. For potable water or food-contact applications, final compliance must be established under the applicable food-contact regulation, such as 21 CFR 177.1500 for nylon resins or 21 CFR 175.300 for resinous coatings, depending on the end use and the complete formulation. A statement of food-contact compliance cannot be made from the base resin alone if the powder is modified with pigments or flow agents.
| Characteristic | PA11 (WHITE RDP 21 ES base) | PA12 fine powder | PA6/PA66 powder |
|---|---|---|---|
| Melting peak | 183–187 °C | 176–180 °C | 215–265 °C |
| Water absorption at saturation | 1.6–2.0 % | 1.0–1.4 % | 8–10 % |
| Density | 1.03–1.05 g/cm³ | 1.01–1.03 g/cm³ | 1.12–1.14 g/cm³ |
| Low-temperature impact | High | High | Moderate |
| Monomer basis | Castor oil | Petroleum | Petroleum |
Compared with PA12 fine powders, the PA11 base in WHITE RDP 21 ES has a higher melting peak and a broader processing plateau, which can be useful in parts exposed to elevated under-hood or process temperatures. The water absorption of PA11 is slightly higher than PA12 but substantially lower than PA6 or PA66; therefore, PA11 maintains better dimensional stability in humid service than short-chain polyamides. In abrasion service, polyamide 11 coatings generally provide high Taber abrasion resistance, but the exact weight loss measured by ASTM D4060 depends on wheel type, load, and film thickness. The white grade is specified when the coated article must meet a light-colour or visual standard, whereas natural grades are used for translucent films and black grades for UV light shielding.
On automated coating lines, powder is usually fed from stainless-steel hoppers with fluidizing membranes supplied with dried compressed air at 0.5–1.5 bar. Dense-phase pumps or venturi injectors deliver powder to electrostatic guns. Powder hose length should be minimized to reduce impact fusion and fines generation. If impact fusion occurs, the resulting agglomerates can block sieves and produce specks in the white film. Reclaimed powder can be blended with virgin material at controlled ratios, generally not exceeding 20–30 % reclaim depending on line conditions and appearance requirements. The reclaim ratio must be validated by measuring colour, gloss, and dry-film thickness after reclaim addition. In fluidized-bed operations, the reclaim rate is often lower because part immersion and hot surfaces can prematurely sinter the powder.
Powder handling requires dust-control measures. Polyamide 11 powders can form explosive dust-air mixtures. Explosion parameters should be measured for the specific grade following ISO/IEC 80079-20-2 or equivalent methods. Extraction systems, grounding of powder handling equipment, and avoidance of open flames are mandatory. The white pigmentation does not remove the need for explosion protection; titanium dioxide is an inert inorganic pigment, but the polymer phase remains combustible. Regulatory assessments should also be based on the final powder formulation and cured film. Under REACH EC 1907/2006, the substance registration covers the polyamide 11 base, but the formulator or coater is responsible for evaluating the pigmented mixture and any added flow agents. RoHS 2011/65/EU heavy-metal restrictions apply to the final coated article in electrical and electronic equipment.
For dishwasher baskets and similar wire goods, the white PA11 coating is expected to resist hot alkaline detergents and mechanical loading provided the substrate preparation and film thickness are adequate. Typical film builds on wire goods range from 200–400 µm; wire intersections are prone to thin coverage and should be inspected with non-destructive thickness measurement according to ISO 2178 or ISO 2808. Adhesion after boiling-water immersion is commonly evaluated by ISO 2409, and blistering is assessed by ISO 4628-2. Published data for WHITE RDP 21 ES in this specific dishwasher configuration is limited; therefore, production qualification should include a thermal-cycle and detergent-immersion test using the actual rack design.
