| HS Code | 266686 |
| Productname | Arkema Rilsan Fine Powders T YELLOW 7379 MAC PA11 |
| Material | Polyamide 11 (PA11) |
| Color | Yellow |
| Specificgravity | 1.04 g/cm³ |
| Meltingpoint | 186 °C |
| Particlesized50 | 80 µm |
| Bulkdensity | 0.50 g/cm³ |
| Shoredhardness | 70 |
| Tensilestrength | 50 MPa |
| Elongationatbreak | 350 % |
| Impactstrength | No break (Charpy) |
| Abrasionresistance | Excellent |
| Chemicalresistance | Resistant to many solvents and diluted acids |
| Waterabsorption | 1.0 % at 20 °C / 65 % RH |
As an accredited Arkema Rilsan Fine Powders T YELLOW 7379 MAC PA11 factory, we enforce strict quality protocols—every batch undergoes rigorous testing to ensure consistent efficacy and safety standards.
| Packing | Supplied in 25 kg multi-layer bags, this yellow PA11 fine powder is packaged securely for safe handling and storage. |
| Container Loading (20′ FCL) | Load 20′ FCL with palletized sealed bags of Arkema Rilsan Fine Powders T Yellow 7379; stow securely, keep dry, away from heat and ignition sources. |
| Shipping | This fine polyamide powder requires careful shipping to prevent dispersion and moisture uptake. Use sealed, grounded containers to avoid static buildup. Ensure proper labeling for non-hazardous polymer dust, and maintain dry conditions. Handle with standard industrial hygiene practices, avoiding high temperatures. Deliver promptly to preserve product quality. |
| Storage | Store in a cool, dry, well-ventilated area away from direct sunlight, heat, sparks, and open flames. Keep the container tightly sealed to prevent moisture absorption and contamination. Avoid contact with strong oxidizers. Maintain temperatures below 40°C (104°F) and use within one year of receipt for optimal performance. |
| Shelf Life | Shelf life is typically 2 years from manufacture when stored cool, dry, in original sealed container. |
Dishwasher basket coating lines operate with carbon steel wire racks preheated to 260–280 °C before immersion in a fluidised bed containing Arkema Rilsan Fine Powders T Yellow 7379 MAC PA11 as the sole binder. The formulation addition ratio is 100 % as-supplied pigmented powder; no co-reactant, accelerator, or thermoset crosslinker is introduced because film formation proceeds by melt fusion and recrystallisation of PA11 rather than cure chemistry. On 4–6 mm wire diameter, immersion time is held at 2–6 s and produces a 250–400 µm fused film; where a corrosion primer is used, it is limited to 10–15 µm dry film thickness and the PA11 topcoat then accounts for 90–95 % of the total dry film system. Pretreatment comprises alkaline degreasing at 60–70 °C, reverse-osmosis rinse, and iron phosphating to 1.5–2.5 g/m²; blast cleaning to ISO 8501-1:2007 Sa 2½ is substituted when the wire is heavily rusted. Compliance for North American household dishwasher components sold into food-zone areas is evaluated under NSF/ANSI 51-2023, while European market product must meet Regulation (EU) No 10/2011 with an overall migration limit of 10 mg/dm²; the base polyamide 11 resin is referenced in FDA 21 CFR 177.1500. The main production-line failure mode is edge bridging at welded intersections, where the reduced thermal mass of the weld fillet drags excess powder during fluidisation and produces local film thickness above 600 µm; this defect reduces falling-weight impact resistance under ISO 6272-1:2011 and is controlled by reducing preheat temperature to 260 °C or by air-knife levelling after withdrawal. Batch-to-batch moisture content is checked by the Karl Fischer method; when moisture exceeds 0.2 %, steam pinholes appear in the fused film unless the powder is dried at 80 °C for 4 h before charging the fluid bed. Terminal products are dishwasher basket assemblies, cutlery caddies, and lower-rack tine supports.
The selection is driven by repeated sliding wear, stone-chip exposure, and impact loading of stamped DC01 steel brackets under seat-latch actuation. Rilsan Fine Powders T Yellow 7379 MAC PA11 is applied at 100 % as-supplied powder over a zinc-flake or e-coat base, with PA11 forming 80–90 % of the total dry film system; dry-blended external lubricant, where used, is limited to 0.3–0.8 wt% because higher levels reduce cross-cut adhesion to the base layer. Coating is performed with corona electrostatic spray guns at 60–80 kV and a powder feed pressure of 1.0–1.5 bar; parts are preheated to 230–260 °C and post-fused in a convection oven at 200–220 °C for 3–5 min. Reclaimed powder is limited to 30 wt% of the feed blend; higher proportions shift particle size distribution toward fines and increase back-ionisation in the corona field, visible as starred orange peel on vertical faces. Automotive qualification protocols require ISO 9227:2022 neutral salt spray exposure with scribe creep not exceeding 2 mm after a customer-defined duration, ISO 2409:2020 cross-cut adhesion classification of 0–1, and ISO 4624:2016 pull-off adhesion testing when the coating is specified over smooth e-coat; OEM acceptance values are confidential and must be agreed with the tier-one converter. The operational boundary is the 180–250 µm window: below 180 µm edge coverage on punched holes becomes discontinuous, while above 300 µm the seat-latch pawl may experience torque drift due to coating creep under sustained clamp load. Terminal components are seat-latch brackets, seat-belt anchor plates, and sliding seat-rail wear inserts.
For topside and subsea valve packages operating under ISO 12944-2:2018 C5-M conditions, cast iron valve handwheels and pipe support pads are coated with Rilsan Fine Powders T Yellow 7379 MAC PA11 as a 100 % thermoplastic topcoat over a 60–80 µm fusion-bonded epoxy primer. The PA11 topcoat therefore represents 80–85 % of the total dry film thickness when the final system is specified at 400–500 µm. Preheating is carried out to 280–300 °C for sand castings, allowing 1 min/mm wall thickness to prevent outgassing pinholes at the coating interface; after fluidised-bed dip coating, the parts are post-crystallised at 180–200 °C for 5–8 min to stabilise impact strength and avoid fast-quench under-crystallisation. Qualification testing is run under ISO 9227:2022 neutral salt spray and ISO 12944-6:2018 for high-durability C5-M systems; where Norwegian continental shelf delivery is required, NORSOK M-501:2022 may impose additional cyclic ageing and stone-impact testing, and the converter must verify whether the specific yellow grade requires a topcoat sealer. Published data for this exact pigmented grade under subsea splash-zone exposure is limited, so qualification panels should be exposed simultaneously with the production run. The terminal product types are valve handwheels, pipe support pads, lifting lugs, and pump impeller nuts.
| Application scenario | Standard / clause | Property evaluated | Acceptance practice |
|---|---|---|---|
| Dishwasher wire goods | NSF/ANSI 51-2023; FDA 21 CFR 177.1500; EU No 10/2011 | Food-zone material suitability; overall migration | 10 mg/dm² OML under EU; end-use extractable testing required |
| Automotive seat-latch brackets | ISO 9227:2022; ISO 2409:2020; ISO 4624:2016 | Neutral salt spray, cross-cut adhesion, pull-off adhesion | Scribe creep ≤ 2 mm; class 0–1; OEM values confidential |
| Offshore valve components | ISO 12944-2:2018; ISO 12944-6:2018; NORSOK M-501:2022 | Corrosivity class, high-durability cyclic ageing, offshore system qualification | C5-M high durability; converter-conducted qualification panels |
| Food processing equipment | EU No 10/2011; FDA 21 CFR 177.1500; NSF/ANSI 51-2023; EC 1935/2004 | Migration, food-zone material suitability, traceability | 10 mg/dm² OML; enamel or coating not to mask substrate defects |
| Busbar insulation | ASTM D149-20; ASTM D257-14; IEC 60455-2:2015; UL 94 | Dielectric strength, volume resistivity, insulation resin testing, flammability | Converter-level type testing mandatory for finished assembly |
| Textile machinery guides | REACH 1907/2006; RoHS 2011/65/EU; ISO 8501-1:2007; ISO 2409:2020 | Surface preparation, adhesion, restricted substance documentation | Sa 2½ blast; cross-cut class 0–1 after conditioning |
Direct-contact food processing equipment requires the coating to perform as a hygienic surface under clean-in-place chemistry, not merely as a corrosion barrier. Rilsan Fine Powders T Yellow 7379 MAC PA11 is applied at 100 % as-supplied powder, with an optional 20–30 µm food-grade epoxy primer when the substrate is stainless steel; in that system the PA11 topcoat constitutes 85–90 % of the dry film. Conveyor guide rails, star wheels, and dough mixer paddles are preheated to 250–260 °C and coated by electrostatic spray at 50–70 kV, then fused at 200–210 °C for 4–6 min. The acceptable film thickness is 300–450 µm; below 250 µm the coating is prone to pinhole initiation under 2 % sodium hydroxide CIP solution at 80 °C, while above 500 µm edge build-up can crack at radii sharper than 3 mm. Compliance is governed by Regulation (EU) No 10/2011 Annex I and an overall migration limit of 10 mg/dm², FDA 21 CFR 177.1500 for nylon 11, NSF/ANSI 51-2023 for food-zone equipment, and Regulation (EC) No 1935/2004 Article 3 for traceability. The production-line failure mode is over-spray on cold spots of thin stainless sheet, leading to unfused powder inclusion; therefore process validation includes a hot-tape pull test after each shift and holiday detection under ASTM D5162-15. Terminal product types are product transfer guide rails, star-wheel pockets, kneading paddles, and slicer blade guards.
Copper and aluminium busbars for low-voltage switchgear are coated with Rilsan Fine Powders T Yellow 7379 MAC PA11 as a 100 % as-supplied thermoplastic powder; the absence of a crosslinking agent permits re-fusion and field repair of localised damage, but limits continuous operating temperature to the PA11 heat-deflection range below its melting onset. Filler addition is zero for insulation-critical applications because conductive or semi-conductive particulates raise volume conductivity and reduce dielectric performance. Substrates are preheated to 230–250 °C, coated electrostatically at 60–80 kV to a film thickness of 400–600 µm, and post-fused at 200–220 °C for 5–8 min. Volume resistivity and dielectric strength are tested per ASTM D257-14 and ASTM D149-20; insulation compatibility is evaluated under IEC 60455-2:2015, and flammability is screened under UL 94. Published data for this exact yellow grade under 500 µm films is limited, so converter-level type testing on the finished busbar assembly is mandatory, and generic PA11 dielectric data must not be transferred unverified. Terminal components are busbars, terminal posts, and cable gland adapters.
High-speed draw-twisting frames processing polyester filament at 800–1200 m/min utilise steel yarn guide rails coated with Rilsan Fine Powders T Yellow 7379 MAC PA11 as the sole powder at 100 % as-supplied; the substrate is grit-blasted to ISO 8501-1:2007 Sa 2½, preheated to 250–270 °C, dip-coated in a fluidised bed for 2–4 s, and post-fused at 200–220 °C for 3–5 min to yield a 250–350 µm film. Compliance for European machinery supply is maintained through REACH Regulation (EC) No 1907/2006 Article 33 and RoHS Directive 2011/65/EU; adhesion is verified by ISO 2409:2020 cross-cut testing, while the terminal products are yarn guide rails, balloon control rings, and tensioner arms in ring-spinning and texturising frames.
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Arkema Rilsan Fine Powders T Yellow 7379 MAC is a thermoplastic polyamide 11 powder coating grade supplied for solvent-free thermal coating of metal parts. The product is built on a semi-crystalline PA11 backbone derived from 11-aminoundecanoic acid of castor oil origin. It belongs to the Rilsan Fine Powder T series, in which particle-size distribution and melt-flow behaviour are controlled for fluidized-bed dipping and electrostatic spray application. The full grade designation identifies the T series, the Yellow 7379 colour match, and the MAC metallic adhesion classification. Public literature does not disclose the exact pigment loading or toning system used in Yellow 7379 MAC. The base resin density is 1.04 g/cm³ under ISO 1183-1:2019, and the polymer melting temperature is reported between 184 °C and 188 °C by differential scanning calorimetry under ISO 11357-3:2018. The product is intended for applications that require a dry, high-molecular-weight thermoplastic layer with low water uptake, high impact toughness, and resistance to abrasive wear.
The thermal response of T Yellow 7379 MAC is governed by the PA11 crystalline phase. The melting range places it above standard PA12 coating powders and below high-temperature thermoplastics such as PPS or PEEK. The melt-viscosity profile is designed for fusion on preheated metal substrates rather than for injection moulding or extrusion. Table 1 summarizes the class-typical property set for Rilsan Fine Powder PA11 grades. Values for the yellow-pigmented grade should be confirmed against the lot certificate because pigment addition can alter melt rheology, gloss, and electrostatic charging behaviour.
| Property | Test method | Typical value or range | Notes |
|---|---|---|---|
| Polymer type | — | Polyamide 11 | Castor oil-derived monomer |
| Resin density | ISO 1183-1:2019 | 1.04–1.06 g/cm³ | At 23 °C |
| Melting temperature | ISO 11357-3:2018 | 184–188 °C | DSC second heat |
| Particle size D50 | ISO 13320:2020 | 80–120 µm | Lot-specific target for fluidized-bed use |
| Moisture content | ISO 15512:2019 | <0.1 % after drying | After 4 h at 80 °C |
| Applied film thickness | ISO 2178:2016 | 250–400 µm | Fluidized-bed dip after cure |
| Gloss at 60° | ISO 2813:2014 | Pigment-dependent | Not controlled by the PA11 resin alone |
The tabulated values are derived from the Rilsan Fine Powder PA11 class and standard PA11 polymer data rather than from a published technical datasheet dedicated exclusively to Yellow 7379 MAC. Published data for this specific yellow configuration is limited. Therefore, lot-specific certificates should be used for release testing, particularly when gloss, colour, and film-build limits are contractually fixed.
Fluidized-bed processing of this product is controlled by three thermal zones. The first is the preheat oven, where steel or cast iron parts are heated to 260–350 °C under forced air. The second is the fluidized bed, where dry compressed air passes through a porous plate to suspend the powder. The third is the post-cure oven, where the coalesced film is held at 180–200 °C for 3–5 min. On a production line using a mesh-belt oven and stainless-steel fluid bed, a steel component with 4 mm wall thickness typically requires 4–6 min preheat to reach the target surface temperature. Thin sheet metal may require less time.
Immersion time between 2 s and 4 s produces dry film thickness from 250 µm to 400 µm as measured by magnetic induction under ISO 2178:2016. Overheating above 400 °C causes yellowing and oxidative degradation of the PA11 chain. Underheating below 260 °C leads to incomplete melt coalescence, pinholes, and poor adhesion. The powder should be dehumidified if exposed to relative humidity above 60 % for more than 2 h. Typical drying conditions for PA11 are 80 °C for 4 h under circulated dry air with residual moisture content below 0.1 % by ISO 15512:2019. These parameters are class-typical for Rilsan Fine Powder T grades and must be adjusted for part mass, line speed, and oven recovery capacity.
Electrostatic spray application of T Yellow 7379 MAC uses corona charging guns operated at 40–80 kV. The powder is deposited on a grounded preheated part. Preheat temperature for spray application is usually 180–220 °C; the part is then moved to a post-cure oven at 180–200 °C. Film thickness is typically controlled between 150 µm and 300 µm for edge protection. Multiple passes may be required for heavier films. Powder recovered from the spray booth can be reused if sieved through a 125 µm mesh and mixed with virgin powder at a maximum recycled fraction of 20 wt%. Higher recycle ratios can shift charge acceptance and reduce transfer efficiency. Published production data specific to Yellow 7379 MAC recycle ratios is limited.
Compared with PA12 fine powders, the PA11 structure in T Yellow 7379 MAC has a higher melting point, typically 184–188 °C versus 176–180 °C for standard PA12 coating powders. The PA11 density is approximately 1.04 g/cm³, while PA12 is approximately 1.01 g/cm³. PA11 offers a different balance of stiffness, low-temperature toughness, and surface hardness. Compared with PA6 and PA66, PA11 shows lower moisture uptake because the amide group concentration per polymer chain is lower. This property reduces dimensional swelling and loss of mechanical strength in humid environments.
Compared with epoxy powder coatings, T Yellow 7379 MAC does not rely on a thermosetting cure reaction. Epoxy powders form highly crosslinked films with good chemical resistance, but they can be brittle under impact and abrasion. PA11 coatings absorb more fracture energy before failure. The PA11 powder also has a narrower processing window than thermosetting epoxy because it requires controlled melt fusion and sufficient substrate preheat. Colour-specific differences between Yellow 7379 MAC and neutral or grey Rilsan T grades are driven by pigment volume concentration and pigment thermal stability. Yellow pigments can shift gloss at 60° under ISO 2813:2014 and may require a small adjustment in preheat temperature. Exact gloss values for this shade are not published in open technical literature.
The MAC designation distinguishes the grade from non-MAC fine powders intended for less demanding adhesion environments. The series is formulated to maintain bond strength on metal when used with appropriate mechanical pretreatment and primer. The difference is not a change in base polymer but a combination of melt-viscosity control, particle-size distribution, and surface-wetting behaviour. Users should compare the MAC grade against standard T grades only after adhesion testing under ISO 2409:2020 or ASTM D3359-23 on the actual substrate and primer system.
Adhesion of a PA11 fine powder film to steel or aluminium is not obtained by chemical grafting alone. It depends on mechanical anchor profile and, in many corrosive service conditions, an epoxy or phosphate primer. Steel is degreased and abrasive blasted to a surface profile of 25–50 µm. Aluminium is conversion coated with chromate or chrome-free zirconate chemistry. The part is then primed with a thin bake-dried layer before powder coating. Cross-cut adhesion is assessed by ISO 2409:2020 or ASTM D3359-23; class 0 or 1 is commonly specified on primed steel. Pull-off adhesion by ISO 4624:2023 can exceed 10 MPa on blasted steel, but published data for Yellow 7379 MAC with specific primer combinations is limited.
Insufficient substrate preheat allows the powder to deposit without melt coalescence. Excessive preheat can degrade the primer and oxidise the PA11 surface, reducing intercoat adhesion. The MAC classification indicates a series intended for metallic adhesion, so primer compatibility should be confirmed against the supplier data sheet and validated on production geometry. The grade is not formulated as a self-priming system on untreated steel in aggressive immersion service.
Neutral salt spray testing under ISO 9227:2022 is the standard corrosion qualification for PA11 powder coatings on ferrous substrates. When applied over an approved epoxy or zinc-rich primer at 250–400 µm, PA11 systems are often qualified to 1000 h or more with scribe creep below 2 mm. The exact pass/fail criterion depends on the end-user specification. Abrasion resistance is evaluated with Taber abrasion under ASTM D4060-19 using CS-17 wheels and a 1000 g load. Weight-loss values are strongly dependent on film thickness and primer type. Impact testing by ISO 6272-1:2022 or ASTM D2794-93 provides a comparative measure of coating toughness. PA11 films generally resist direct impact exceeding 18 J on a 2 mm steel panel, while reverse-impact performance is influenced by plasticizer content and film thickness. Published yellow-pigment-specific test data for this exact product is limited.
Compliance should be verified using the safety data sheet and supplier certificate because the yellow pigment system may contain trace metals or organic pigments not covered by generic PA11 regulatory statements. Table 2 lists the common reference points for industrial coating use.
| Topic | Reference | Status or verification point |
|---|---|---|
| REACH polymer exemption | EC 1907/2006, Article 2(9) | PA11 is exempt as a polymer; monomer and impurity registration obligations remain with the supplier |
| RoHS heavy-metal limits | Directive 2011/65/EU | Lead <1000 mg/kg, cadmium <100 mg/kg, mercury <1000 mg/kg by XRF on powder; verify pigment lot |
| Food contact | FDA 21 CFR 175.300 / 177.1500 | Conditions of use, migration limits, and specific grade require supplier confirmation |
| Dust exposure | OSHA 29 CFR 1910.1000 Table Z-1 | Total particulate not otherwise classified: 15 mg/m³ total, 5 mg/m³ respirable; local exhaust ventilation required |
Storage conditions for Rilsan Fine Powders T Yellow 7379 MAC are dry, sealed, and below 25 °C. The material should be kept in original polyethylene-lined containers away from ultraviolet exposure and moisture. At ambient humidity above 60 %, opened containers should be dried at 80 °C for 4 h before use. The recommended shelf life for many Rilsan Fine Powder grades is 24 months in unopened packaging at 20–25 °C; visual inspection and moisture testing should be performed after prolonged storage. Powder exposed to moisture can show reduced charge acceptance, pinholes, and adhesion loss. Fluidisation air should be filtered to less than 0.1 mg/m³ oil and dried to a dew point below -40 °C to prevent agglomeration and spitting in the bed.
Particle-size distribution determines fluidization behaviour. The T series is controlled to a D50 between 80 µm and 120 µm as measured by laser diffraction under ISO 13320:2020. Coarser particles settle and reduce bed density. Finer particles create dust and increase explosion risk. Sieve analysis may be used on the production floor with 75 µm and 150 µm screens; the oversize fraction should remain below 1 wt%. Yellow 7379 MAC may exhibit slightly altered bulk density due to pigment particle shape. Hopper vibration and fluidising air pressure should therefore be set according to lot-specific flow tests rather than transferred directly from unpigmented PA11.
Field production experience with yellow PA11 powders shows that pigment-related coverage variation can appear if film thickness drops below 150 µm. Dense yellow tint may require higher film build than black or grey to achieve hiding power. On complex geometries, Faraday cage areas in electrostatic spray can cause thin coverage; auxiliary tribo charging or hot flocking may be required. The product is not recommended for continuous immersion in strong mineral acids, concentrated nitric acid, or phenolic solvents without compatibility testing. Continuous exposure to strongly alkaline media at elevated temperature should also be tested because PA11 can undergo hydrolysis under extreme pH conditions. No single chemical-resistance statement replaces immersion testing on the actual substrate and primer system.
