| HS Code | 277056 |
| Chemical Composition | Polyamide 11 (PA11) bio-based polymer |
| Color | White |
| Density | 1.04 g/cm³ |
| Melting Point | 186 °C |
| Tensile Strength | 45 MPa |
| Elongation At Break | 300% |
| Shore D Hardness | 78 |
| Impact Resistance | No break (Charpy impact test) |
| Water Absorption | 1.4% at saturation |
| Dielectric Strength | 16 kV/mm |
| Particle Size Distribution | D50 approximately 60 microns |
| Abrasion Resistance | Excellent |
As an accredited Arkema Rilsan Fine Powders TECHLINE WHITE 7601 PA11 factory, we enforce strict quality protocols—every batch undergoes rigorous testing to ensure consistent efficacy and safety standards.
| Packing | Supplied in 25 kg sealed polyethylene bags, this PA11 fine powder is packaged for safe handling and moisture protection. |
| Container Loading (20′ FCL) | Load 20′ FCL with Arkema Rilsan Fine Powders TECHLINE WHITE 7601 PA11, using secure palletized packaging, moisture-proof lining, proper ventilation, and safe handling procedures. |
| Shipping | Arkema Rilsan Fine Powders TECHLINE WHITE 7601 PA11 is shipped in sealed, moisture-resistant containers to preserve flow and purity. Standard ground freight applies; keep dry, avoid extreme heat, and store upright. Not classified as hazardous under typical conditions, but use proper PPE and follow manufacturer handling guidelines. |
| Storage | Store in original, unopened container in a cool, dry, well-ventilated area away from heat, open flames, and direct sunlight. Keep tightly sealed to prevent moisture absorption and contamination. Avoid generating airborne dust. Maintain temperatures below 30°C (86°F). Under these conditions, shelf life is typically 12 months from date of manufacture. |
| Shelf Life | Shelf life is typically 2 years from manufacture when stored in original, unopened packaging in a cool, dry place. |
Surface preparation for potable water gate valves and flanged spools receiving Arkema Rilsan Fine Powders TECHLINE WHITE 7601 PA11 begins with dry abrasive blasting to SSPC-SP10/NACE No. 2 near-white metal, followed by angular profile verification in the 50–75 µm range under ISO 8503-2. A phosphate or phenolic primer is not required when the surface is freshly blasted and soluble salts are below 20 mg/m² equivalent NaCl per ISO 8502-9. The powder is electrostatically deposited with corona-gun settings between 60 kV and 100 kV, delivery air between 0.5 bar and 1.5 bar, and fluidizing air with a dew point below -40 °C. Substrate preheat at the point of powder impact is controlled between 220 °C and 260 °C using short-wavelength pyrometry calibrated against contact thermocouples. Fusion completes in circulated air at 180–200 °C for 2–5 min. Minimum dry film thickness is 250 µm on flat surfaces and 300 µm at valve-body corners to compensate for thinning. Pull-off adhesion according to ISO 4624 is commonly specified at ≥10 MPa mean with no more than 30% adhesive failure at the steel interface. Potable water service compliance is documented through AWWA C224 and NSF/ANSI/CAN 61 when the applicator follows the certified protocol. Incoming powder lots are checked for particle size distribution by laser diffraction under ISO 13320-1; retained material on a 200 µm sieve exceeding 0.5% is rejected for electrostatic work because it creates spray splatter. Production failure modes include back-ionization caused by powder moisture above 0.2% by weight, producing orange-peel and pinpoint voids; moisture is verified by Karl Fischer titration at 160 °C or the supplier’s oven method. Edge coverage below 250 µm on gate-valve guiding ribs has been associated with corrosion creep during thermal cycling between 5 °C and 60 °C in water lines.
In sewage sludge service, hydrogen sulfide and abrasive grit accelerate coating loss on wastewater penstock gate stems; fluidized bed application of the 7601 white PA11 powder is specified where the stem must survive reciprocating travel through bronze guide blocks and occasional contact with wet sludge at pH 2.0–5.5. Degreasing is followed by blast cleaning to ISO 8501-1 Sa 2.5 with chilled iron grit, and the surface profile is held between 60 µm and 85 µm. Preheat for fluidized bed dip coating is maintained between 260 °C and 280 °C in a gas-fired recirculating oven; the stem is immersed in the fluidized powder bed for 3–8 s, withdrawn slowly to allow melt flow-out, and then water-quenched or air-cooled below 60 °C before handling. Fluidization air is dried to a dew point below -40 °C, and bed density is controlled by adjusting air flow so that the expanded bed height remains within 10–15% of the settled bed height. Coating thickness on sealing journals is measured by magnetic induction per ISO 2360 and is maintained between 300 µm and 600 µm; above 600 µm clearance interference with guide blocks has been recorded, while below 300 µm pitting corrosion in the packing area appears within 12–18 months of intermittent operation. Pinhole integrity is tested with a DC holiday detector at 1 kV per 100 µm of film thickness according to ISO 2746 or NACE TM0384. Wastewater contact is commonly evaluated under AWWA C224, supplemented by ASTM D543 immersion in 10% sodium chloride at 23 °C for 30 d with no blistering or adhesion loss beyond 10%. Continuous exposure to strong mineral acids above 5 wt% at temperatures above 40 °C falls outside the recommended service envelope for PA11-based films; published chemical resistance data for this specific grade in high-H₂S vapour phases are limited and should be generated for project-specific approvals.
Before electrostatic deposition onto food-contact conveyor rails, substrates are degreased with alkaline detergent at 60–80 °C, rinsed to conductivity below 200 µS/cm, and dried. The fine powder is sprayed onto preheated stainless steel or mild steel supports at 200–230 °C to build a continuous film between 150 µm and 300 µm; fusion proceeds in a recirculating oven at 180–200 °C for 2–4 min, with water quenching avoided on thin-gauge fabrications to prevent distortion. Terminal components include quick-release hopper linings, bakery pan stacking rails, and food chute wear plates. Food-contact suitability is assessed under FDA 21 CFR 177.1500 for nylon resins, and overall migration testing under Regulation (EU) No 10/2011 with its amendments; because the 7601 white grade contains inorganic pigment, the colorant package must be confirmed against the positive list for food-contact plastics. Abrasion resistance is tested with ASTM D4060 Taber abraser using CS-17 wheels and 1 kg load; representative pigmented PA11 films on rigid substrates show mass loss in the range 2.5–4.0 mg/1,000 cycles. Repeated cleaning with 2% sodium hydroxide at 80 °C is common in bakery plants; the PA11 film shows mass uptake in the range 0.5–1.2% after 72 h immersion in that medium and retains adhesion under ASTM D3359 method B with coating removal not exceeding 5%. Process limitations include electrostatic field collapse on thin-gauge stainless steel corners; auxiliary guarding is used to maintain thickness above 150 µm at radii below 3 mm. Pre-drying of the powder for 4–6 h at 60–80 °C is required when storage relative humidity exceeds 60%.
| Application | Standard or regulation | Clause or method | Acceptance condition |
|---|---|---|---|
| Potable water valves | AWWA C224 | Full document | Minimum film thickness 250 µm; holiday-free at 1 kV/100 µm |
| Potable water valves | NSF/ANSI/CAN 61 | Certified applicator protocol | Listing maintained by coating applicator |
| Food-contact conveyor rails | FDA 21 CFR 177.1500 | Nylon resins | Repeated food contact; migration limits per EU 10/2011 |
| Food-contact conveyor rails | ASTM D4060 | CS-17 wheels, 1 kg | Mass loss 2.5–4.0 mg/1,000 cycles |
Rolled aluminium profiles and steel lighting poles that receive a white PA11 powder finish must retain dimensional compatibility with the thermal expansion of the metal substrate; the coating is applied by electrostatic spray with substrate preheat between 200 °C and 240 °C, followed by fusion at 180–200 °C for 2–5 min. Dry film thickness is kept within 180–350 µm on exterior architectural panels to balance edge protection against embrittlement-induced chipping during panel handling. For qualification, accelerated weathering is conducted under ISO 16474-3 Cycle 1 for 1000 h; coating acceptance criteria commonly require ΔE ≤ 3.0 and 50% minimum gloss retention. The white 7601 powder is used for public seating frames, balustrade panels, and lighting pole access covers where chip resistance and colour stability under solar load are required. AAMA 2604 performance requirements for superior-performing organic coatings on aluminium extrusions are applied when the buyer specifies an architectural powder coat; powder applicators must verify that the specified white batch passes dry-film adhesion under ISO 2409 and impact resistance under ASTM D2794. Field failures observed on these lines typically involve local film thickness below 180 µm at drainage holes and weld seams, resulting in filiform corrosion at coastal sites within 24 months. Pre-drying at 60–80 °C for 4–6 h is required if the powder has been exposed to ambient relative humidity above 60%; fluidization air is dried to a dew point below -40 °C to prevent micro-bed collapse.
For closed vessels with cylindrical geometry and flanged-only access, line-of-sight electrostatic deposition is not feasible, so rotational lining is specified to produce a seamless interior film of Arkema Rilsan Fine Powders TECHLINE WHITE 7601 PA11. The vessel is charged with 5–8 wt% of the shell weight in powder, closed, and rotated biaxially at primary-axis speed of 4–8 rpm and secondary-axis speed of 1–2 rpm inside a forced-circulation oven held at 260–280 °C. First-pass build-up rate is typically 0.8–1.5 mm per cycle; additional cycles are run to reach a total internal thickness of 3–5 mm. After fusion, rotation continues during air cooling to below 80 °C to avoid slumping and pinhole formation at the bottom knuckle radius. Lined vessels are used for storage of non-acidic wastewater, surfactants, or brine at service temperatures below 50 °C. Adhesion is tested with a high-voltage holiday detector at 15 kV for a 4 mm nominal coating; pinhole-free acceptance is required because any breach exposes the carbon steel shell to under-film corrosion. Immersion testing according to ISO 2812-1 in 10% sodium chloride at 23 °C for 60 d must show no blistering, cracking, or adhesion loss beyond 10%. Continuous exposure to sulfuric acid above 10 wt% or sodium hydroxide above 40 wt% at elevated temperature is outside the recommended service envelope; PA11 films show progressive mass uptake in concentrated acidic media and measurable hardness loss after 30 d at 60 °C.
| Parameter | Electrostatic spray | Fluidized bed dip | Rotational lining |
|---|---|---|---|
| Surface profile | 50–75 µm | 60–85 µm | 50–75 µm |
| Preheat temperature | 220–260 °C | 260–280 °C | 260–280 °C |
| Fusion temperature | 180–200 °C | 180–200 °C | 260–280 °C oven |
| Film thickness | 150–600 µm | 300–600 µm | 3–5 mm |
| Moisture limit | 0.2% by weight | 0.2% by weight | 0.15% by weight |
Because threaded stainless steel fasteners driven into aluminium decks form galvanic couples in saltwater, a PA11 coating isolates the shank and underhead region from the aluminium substrate; fluidized bed application is used to coat deck screws, hinge pins, and cable guide bolts. Blast cleaning to ISO 8501-1 Sa 2.5 with aluminium oxide grit produces a 50–75 µm profile without embedding ferrous particles that could initiate rust staining. The fasteners are preheated to 270–285 °C, immersed in the fluidized powder bed for 2–5 s, and post-fused at 180–200 °C for 1–3 min. Coating thickness on threads is maintained between 75 µm and 150 µm; above 150 µm thread interference occurs, and below 75 µm the film can be cut through by thread edges during tightening, exposing the base metal. Salt spray resistance is evaluated under ISO 9227 for 1000 h with no red rust and no under-film creep beyond 2 mm at a scribed line. The coated fasteners are used in aluminium gangways, deck fittings, and small-boat rail hardware where direct contact between stainless steel and aluminium must be prevented. Because PA11 has lower hardness than the stainless steel substrate, high-torque installation with hardened washers can displace the film; torque specifications must be reduced or a hard polymer topcoat specified. Powder moisture above 0.2% by weight before dip coating produces void clusters at the thread roots and reduces salt spray performance; pre-drying at 60–80 °C for 4 h is required if storage relative humidity exceeds 60%.
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Arkema Rilsan Fine Powders TECHLINE WHITE 7601 PA11 is supplied as a white-pigmented polyamide 11 fine powder for electrostatic spray and fluidised-bed deposition on metallic substrates. The base resin is synthesised from 11-aminoundecanoic acid derived from castor oil; the TECHLINE designation identifies coating-grade powders with controlled particle size distribution and coalescence behaviour. The white pigmentation is intended to provide opacity and colour stability, but it also changes the surface charging characteristics relative to natural PA11 powder. ISO 8130-2 laser diffraction and ISO 8130-3 sieve analysis are used for particle size quality control. The product is a thermoplastic solid at ambient temperature; film formation requires heating above the crystalline melting point, typically in the range 183–189°C for PA11 as measured by ISO 11357-3.
Storage and handling are process-critical. The powder should be kept in sealed containers below 30°C and below 60% relative humidity. Moisture regain in PA11 at saturation is approximately 1.0–2.0% by ISO 62. At humidities above 60%, fluidisation and triboelectric charging become inconsistent because absorbed water alters dielectric properties and particle cohesion. A dry air supply with a dew point of −40°C is recommended for powder hopper fluidisation. Agglomerated powder should be screened through a 150 µm mesh before use, and reused powder should be mixed with virgin material at a controlled ratio to maintain transfer efficiency.
The product is not an injection moulding or extrusion compound. It is delivered as a free-flowing coating powder. Because the coating is thermoplastic, overspray can be reclaimed and re-used within limits; however, reclaimed powder contains a higher proportion of fines and can exhibit different fluidisation and charge acceptance. A screen analysis through 150 µm mesh and mixing with virgin powder at a ratio of 20–30% reclaim is used on production lines to maintain transfer efficiency. The ratio is not fixed; it must be adjusted when the D90 of the reclaimed fraction exceeds 140 µm or when the application rate becomes unstable.
White pigmentation, typically achieved with titanium dioxide, modifies the surface conductivity and charge acceptance of the powder. In corona-charging spray guns operating at 30–70 kV, the white grade may require lower gun voltage or higher powder output than an unpigmented grade to avoid back-ionisation on the part. Back-ionisation initiates when accumulated charge in the deposited layer exceeds the dielectric breakdown field of the air within the powder film, producing small craters. The effect is observed in production-scale coating of zinc-phosphated steel brackets, where excessive voltage creates pinholes in the deposited layer before coalescence. Gun-to-part distance is normally maintained at 150–250 mm, and the workpiece is grounded to a resistance below 1 MΩ. Transfer efficiency and film thickness distribution should be verified on a standardised test fixture before volume production, using ISO 2178 for dry film thickness on ferrous substrates and ISO 2360 on non-ferrous substrates.
The difference from black or natural PA11 is not limited to appearance. The white pigment can also alter thermal absorption during post-fusion. A white powder layer reflects more infrared radiation than a dark powder, which changes the time required to reach melt temperature in infrared ovens. Processing lines that switch between black and white grades must adjust dwell time or oven intensity to maintain the same coalescence state. For parts with recesses, tribo guns may provide better penetration than corona guns because they do not generate free ions that accumulate at edges; however, tribo charging of white PA11 can be lower and must be validated by charge-to-mass ratio measurement before transfer efficiency is accepted.
When the powder is applied to preheated steel at 250–350°C by fluidised-bed immersion, the substrate heat drives melting. Thick-wall parts may require preheat temperatures at the upper end of this range, while thin sheet components are preheated near 250°C to limit pigment yellowing. Immersion times of 4–10 s followed by post-fusion at 180–200°C for 2–5 min are typical starting parameters. The fluidised bed is supplied with compressed air at a dew point of −40°C and a pressure of 0.5–1.5 bar, adjusted to obtain a smooth, bubbling bed without slugging. For hollow bodies, the component is rotated to prevent powder packing in internal cavities. The transfer time from preheat oven to fluid bed should not exceed 20 s; above this interval, the substrate surface can cool below the crystalline melting point and particle boundaries will persist. On lines with long transfer distances, a holding tunnel or a higher preheat set point is used, but the risk of thermal degradation at the substrate surface must be balanced.
The low melt viscosity of PA11 coating grades at 200°C supports wetting of Sa 2½ blast-cleaned steel without primer. On smooth galvanised surfaces, surface wetting is less reliable, and adhesion should be confirmed by ISO 2409 cross-cut testing or ISO 4624 pull-off testing. Values below 10 MPa on untreated zinc substrates may occur; zinc phosphate pre-treatment or an adhesion primer is then an operational requirement.
The fine particle size distribution reduces the practical minimum film thickness and improves edge coverage. PA11 fine powder coatings can be applied as films from 80 µm to 300 µm in a single pass after thermal coalescence, but the lower limit depends on particle size distribution and substrate mass. On sharp edges and threaded sections, finer particles transfer more efficiently under electrostatic field concentration, reducing pinholing caused by shrinkage during cooling. The coating should be checked for porosity with a low-voltage holiday detector according to ASTM D5162; a test voltage of 9 kV is common for a 200 µm dielectric layer.
Particle size distribution is a primary control because it determines both film thickness and electrostatic transfer. Laser diffraction data commonly report D10, D50, and D90; for fine powder coating PA11, D10 may be near 40–60 µm, D50 at 80–120 µm, and D90 below 160 µm. A batch with an elevated D90 will produce thicker films at identical gun settings and may reduce penetration into narrow gaps. Conversely, excessive fines below 20 µm can reduce fluidisation and increase back-ionisation. On production lines, sieving after reclaim and periodic particle size checks are less disruptive than online laser diffraction, which remains uncommon for powder coating operations.
Moisture sensitivity remains a boundary. PA11 absorbs 1.0–2.0% water at saturation by ISO 62; exposure to high humidity before application increases particle cohesion and clumping. Hopper fluidising air should be dried to a dew point of −40°C, and the spray room should be maintained at 20–25°C and 45–55% relative humidity. If powder has been conditioned incorrectly, sieving through 150 µm mesh and drying at 50–60°C for 2–4 h may restore flow, but charge stability should be re-validated.
| Property | Representative range | Test method |
|---|---|---|
| Density | 1.03–1.05 g/cm³ | ISO 1183-1 |
| Melting point | 183–189°C | ISO 11357-3 |
| Particle size D50 | 80–120 µm | ISO 8130-2 |
| Water absorption at saturation | 1.0–2.0% | ISO 62 |
| Shore D hardness of coating | 70–75 | ISO 868 |
| Mandrel bend diameter without cracking | 10 mm or lower | ISO 1519 |
On carbon steel prepared to ISO 8501-1 Sa 2½ with a surface profile of 50–75 µm, the thermoplastic melt flows into the anchor profile and forms a mechanical bond. The surface profile is measured with replica tape per ISO 8503-2. The resulting adhesion typically exceeds 15 MPa in ISO 4624 pull-off testing on blasted steel. On hot-dip galvanised or zinc electroplated substrates, zinc oxides can reduce wetting and lower pull-off values below 10 MPa; chemical pre-treatment or a primer is required. Surface preparation standards such as ISO 12944-4 may require sweep blasting or zinc phosphate treatment before powder application. Without such treatment, adhesion failure can be cohesive within the zinc corrosion layer. This limitation should be communicated to the supply chain when replacing a thermoset epoxy that does not have the same sensitivity.
Automotive fluid pipes, dishwasher baskets, valve bodies, and pump housings are representative application environments. Coated components are specified where impact resistance and a white appearance are required. On automotive tube coating lines, the powder is applied after phosphate pre-treatment and controlled at 150–250 µm dry film thickness. The coating is then subjected to impact testing according to ASTM D2794 and flexibility testing according to ISO 1519; a well-coalesced PA11 film should withstand mandrel bending around 10 mm without cracking. For stone-chip resistance, SAE J400 or ASTM D3170 may be specified in the end-user approval programme; published data for TECHLINE WHITE 7601 PA11 in this specific configuration is limited and must be generated for the target substrate and film thickness.
The upper processing temperature is constrained by thermo-oxidative degradation rather than crystalline melting alone. Holding the coating in air above 220°C can cause yellowing of the white pigmented layer and loss of impact resistance. Furnace controllers should therefore limit post-fusion oven dwell to 180–200°C for a maximum of 5 min. The post-fusion oven should have a temperature uniformity of ±5°C across the load. Data loggers placed in the thickest and thinnest sections of the workpiece should be used during commissioning to confirm that all surfaces reach 185°C for at least 1 min without exceeding 220°C for more than 2 min. If a heavier component requires longer heat soak, indirect heating or nitrogen purging is used to reduce oxidation. Degradation is indicated by a reduction in the methylene peak in infrared spectroscopy after aging, but pigmented surfaces may mask early colour change. Process validation should therefore include ASTM D2794 impact resistance and ISO 527-3 elongation at break on free films or coated specimens.
The processing window near the lower end is equally critical. If the powder is not raised above the crystalline melting point for long enough, particle boundaries remain visible and the film shows low elongation. A differential scanning calorimetry check by ISO 11357-3 on the cured coating can confirm the disappearance of residual crystallinity from the original powder; however, this is not a substitute for mechanical testing. Production lines should be audited with a temperature data logger placed at the substrate surface during the post-fusion cycle.
| Attribute | PA11 | PA12 |
|---|---|---|
| Density | 1.03–1.05 g/cm³ | 1.01–1.02 g/cm³ |
| Crystalline melting point | 183–189°C | 175–180°C |
| Water absorption at saturation | 1.0–2.0% | 0.7–1.5% |
| Monomer source | 11-aminoundecanoic acid from castor oil | Lauryllactam from petrochemical feedstocks |
| Typical Shore D hardness | 70–75 | 65–70 |
In process replacement studies, PA11 is often selected when higher continuous-use temperature or higher hardness is required, while PA12 is selected where lower water uptake and lower density are critical. The TECHLINE WHITE 7601 PA11 differs from unreinforced PA11 injection moulding grades in that it is a fine powder designed for coating, not for melt extrusion or injection; its viscosity and particle size distribution are not suitable for injection moulding screw feed without compounding. The coating-grade formulation may also contain flow control agents and pigments that are not present in moulding grades. Compared with thermoset epoxy powder, PA11 does not crosslink during film formation; the coating can be re-melted and repaired by local heating, but it exhibits lower tensile modulus and may require more aggressive surface preparation on zinc-coated substrates. Compared with PVC plastisol, PA11 does not rely on external plasticiser migration for flexibility, which reduces the risk of plasticiser loss over the service life.
Chemical resistance of the cured coating is evaluated by immersion testing according to ISO 2812-1. PA11 is resistant to aliphatic hydrocarbons, oils, and many automotive fluids, but strong acids and polar solvents cause swelling or dissolution. The white pigmented layer may show visible staining before mechanical failure, so colour change is not a reliable indicator. Tensile property retention after immersion should be measured according to ISO 527-3; a property retention above 80% is commonly used as a pass criterion for non-structural coatings, but the final requirement depends on the end-use specification.
Compliance with food-contact regulations is not automatic. Where the coated article is intended for repeated food-contact use, verification against FDA 21 CFR 175.300 or Regulation (EU) No 10/2011 must be performed on the final article, including any primer or substrate. REACH and RoHS documentation should be requested from the supplier for the specific batch, as pigment packages can vary by production site and product code. Combustible dust safety per EN 60079-10-2 applies during storage and handling because the fine powder can form explosive dust clouds when dispersed in air.
