| HS Code | 223608 |
| Material | Polyamide 11 (PA11) |
| Color | Grey |
| Physical Form | Fine powder |
| Particle Size D50 | 80 µm |
| Density | 1.04 g/cm³ |
| Bulk Density | 0.55 g/cm³ |
| Melting Point | 186 °C |
| Shore D Hardness | 75 |
| Tensile Strength | 43 MPa |
| Elongation At Break | 250% |
| Impact Resistance | High, excellent at low temperatures |
| Abrasion Resistance | Excellent |
| Chemical Resistance | Good against oils, greases, alkalis, and diluted acids |
| Water Absorption | Low, about 1.0% at saturation |
| Uv Resistance | Good |
As an accredited Arkema Rilsan Fine Powders T GREY 7458 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 grey PA11 fine powder is packaged for safe handling, storage, and industrial use. |
| Container Loading (20′ FCL) | Arkema Rilsan Fine Powders T GREY 7458 PA11 loaded in 20' FCL, packed in 25 kg bags on pallets, secured. |
| Shipping | Arkema Rilsan Fine Powders T GREY 7458 PA11 ships in sealed, moisture-resistant packaging to preserve powder integrity. Transport ambient in dry conditions, avoiding extreme heat and static ignition sources. Standard non-hazardous freight applies, but proper labeling ensures traceability. Full documentation accompanies all shipments for regulatory compliance and safe handling. |
| Storage | Store 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 and contamination. Avoid generating dust; use appropriate grounding during handling. Under these conditions, the powder typically retains its properties for up to 12 months from manufacture. |
| Shelf Life | Shelf life is typically 2 years when stored sealed, cool, and dry, away from moisture and direct sunlight. |
On coil coating lines running at 80–120 m/min, the absence of surface micro-roughness in a single-coat polyester topcoat produces transport-strap chafing returns within the first 8 weeks of appliance warehousing. Arkema Rilsan Fine Powders T GREY 7458 PA11 is incorporated as a grey, fine-grained polyamide 11 powder to transfer a controlled roughness profile to the cured film while retaining formability. The powder is introduced after the pigment dispersion phase but before the final viscosity adjustment, at a rate of 5–12 wt% based on total resin solids. A high-shear dissolver with a tip speed of 15–20 m/s disperses the powder for 10–15 min; the batch temperature is held below 45 °C during this step to avoid premature swelling. The coating is applied on chrome-passivated hot-dip galvanized steel at 18–25 µm dry film thickness and cured at a peak metal temperature of 224–232 °C for 20–35 s. Because the powder reaches the melt transition during cure but remains phase-separated from the polyester matrix at the short dwell, the cured surface displays a low-gloss, rough film; the gloss is measured by EN 13523-2 and the kinematic roughness profile by ISO 4287. Compliance for appliance and architectural coil ends includes EN 13523-0, ISO 1519-1, ISO 2409, and ASTM D4147. Finished article types are domestic appliance side panels, cold-room door skins, architectural spandrel panels, and interior wall cladding. The principal operational boundary is moisture absorption; when the powder has been stored at relative humidity above 60%, drying at 80 °C for 4 h until moisture content is below 0.2% is required to prevent microfoam.
Scale-up from a 5 kg laboratory batch to a 500 kg production vessel changes the shear history. At constant tip speed of 15–20 m/s, the larger vessel requires active jacket cooling to keep batch temperature below 45 °C; without cooling, the adiabatic temperature rise in a 500 kg batch can exceed 12 °C and produce microfoam at the coating surface. The addition point is therefore after the millbase letdown, not before pigment dispersion, to minimize residence time under high shear and to preserve the particle size distribution.
| Qualification parameter | Test method | Acceptance range |
| Gloss at 60° | EN 13523-2 | 15–30 GU |
| Cross-cut adhesion | ISO 2409 | Class 0–1 |
| T-bend | ISO 1519-1 | ≤ 1.5 T |
| Taber abrasion | ASTM D4060 | ≤ 35 mg after 1000 cycles |
A blocked polyester-polyurethane primer containing ceramic microspheres at 10 wt% on total solids exhibits a characteristic failure: crack-propagation pathways through the primer at sharp particle-matrix interfaces. Arkema Rilsan Fine Powders T GREY 7458 PA11 is used at 5–10 wt% of total primer solids, with direct replacement of 30% of the ceramic microsphere loading by polyamide 11 powder. The primer is applied over electrocoat at 18–22 µm dry film thickness with a high-rotation bell at 70–85% electrostatic transfer efficiency. Cure is 20 min at 145 °C, which remains below the PA11 melt peak of approximately 185 °C; therefore the powder survives as discrete elastomeric domains rather than coalescing. Chip resistance is assessed under SAE J400 and ASTM D3170, with a 473 mL gravel charge at 483 kPa pressure in a Gravelometer. Retention ratings of 7 A or 8 A are achievable at the replacement level, versus 5 A in the all-ceramic control. The finite domains also reduce stone-chip delamination at the electrocoat interface. Substrate qualification includes ISO 2409 cross-cut adhesion after 240 h of water immersion at 40 °C. Finished terminal products are automotive rocker panel skins, lower door outer panels, sill extensions, and plastic-metal hybrid battery housings where the primer is applied to metal sections before assembly. A processing constraint is that the powder must be sieved to remove agglomerates above 60 µm before addition, because coarse agglomerates cause spray-nozzle clogging in high-rotation bells.
| Primer formulation condition | Direct impact, in-lb (ASTM D2794) | Gravelometer rating (SAE J400) | Cross-cut class after 240 h water immersion (ISO 2409) |
| Control: 10 wt% ceramic microspheres | 40 | 5 A | Class 2 |
| Replacement: 3 wt% PA11 + 7 wt% ceramic | 60 | 7 A | Class 1 |
| Replacement: 5 wt% PA11 + 5 wt% ceramic | 70 | 8 A | Class 1 |
Concurrently, in offshore and chemical-plant maintenance painting, the need for low-friction, high-abrasion dry-film properties in manually airless-sprayed flanges and spool pieces cannot be met by mineral fillers alone. When Arkema Rilsan Fine Powders T GREY 7458 PA11 is incorporated at 10–20 wt% on total solids of a two-component epoxy-polyamide or epoxy-amidoamine coating, the cured film exhibits a lower coefficient of sliding friction and improved resistance to edge chipping during pipe handling. The addition is made to Part A after rheology modifiers are fully solvated, using a low-speed anchor stirrer at 300–500 rpm for 15 min; the batch is then passed through a horizontal bead mill without grinding media to avoid particle fracture. Application proceeds with a 63:1 airless pump and a reversible clean-out tip of 0.019–0.023 in, giving a wet film thickness of 120–160 µm. Cure is 7 days at 23 °C for full property development. The relevant compliance boundary is ISO 12944-5 for C5-M environments, with test methods ISO 2409, ISO 1519-1, and ISO 4628-2 for blister evaluation after 2000 h of salt spray per ISO 9227. Finished parts are flanges, valve bodies, pump pedestals, pipe spools, and skid frames. The material is not suitable where cathodic protection-induced alkalinity exceeds pH 12 at the coating-metal interface, because amide hydrolysis may be locally accelerated.
Thermoset powder coating production cannot incorporate a high-melting thermoplastic texture agent during twin-screw compounding because the agent would soften and destroy formulation structure. Arkema Rilsan Fine Powders T GREY 7458 PA11 is instead dry-blended into a 60/40 polyester-epoxy hybrid powder after extrusion and classification, at 2–6 wt% of total powder mass. The mixing step uses a vertical cone mixer or plowshare mixer operating at 40–60 rpm for 3–5 min, avoiding high-shear heat input above 35 °C. The dry-blended powder is applied by corona electrostatic spray at 60–80 kV onto zinc-phosphated steel. Curing at 200 °C for 10 min achieves full thermoset crosslinking while the PA11 domains soften and relax to produce a low-gloss, discrete texture without sag. Transfer efficiency remains above 70% when the powder resistance is controlled by the supplier’s surface treatment. Compliance methods are ISO 8130-2, ISO 8130-3, and ASTM D3451. The resulting coated articles include office furniture drawer skins, electronic enclosure covers, laboratory instrument housings, and point-of-sale display frames. The edge coverage benefit is only observed when the dry blend is used within 48 h; longer storage can stratify the two powders due to density differences and transfer efficiency drift.
When a two-piece aluminum can runs through a filling line at 1,800 cans/min, can-to-can abrasion removes exterior basecoat ink and exposes bare metal. Arkema Rilsan Fine Powders T GREY 7458 PA11 is introduced at 3–8 wt% on total basecoat solids in a high-solids polyester-urethane system; the powder is pre-wetted in butyl glycol acetate before addition to prevent floating in the high-speed mixer. The coating is applied by roller coat at 120–180 m/min line speed over washed and conversion-coated 3104 aluminum cups, then UV-cured in 2–5 s at 200–400 mJ/cm². Because the coating film is less than 8 µm dry, the PA11 particle size must be constrained below 25 µm to avoid visible specks. Compliance is tied to FDA 21 CFR 175.300 for resinous and polymeric coatings, and the abrasion test is ASTM D4060 with CS-10 wheels at 1000 g load. Finished products are 330 mL and 500 mL two-piece aluminum beverage cans for beer and carbonated soft drinks. The operational limitation is that the basecoat viscosity at application must not exceed 150 mPa·s at 25 °C, or the powder may transfer unevenly on the roller coater. Published data for this specific grey grade in UV-cured can exterior basecoats is limited; the addition ratio is derived from solventborne coating trials with equivalent PA11 fine powders.
Waterborne flexographic overprint varnishes applied to folding carton board develop blocking failures when pile temperatures exceed 45 °C unless a low-surface-energy particle protrudes from the dried film. Arkema Rilsan Fine Powders T GREY 7458 PA11 is added at 1–3 wt% of formulated varnish weight, following the letdown of acrylic emulsion and before pH adjustment to 8.5–9.0. The varnish is applied with a 200 L/cm anilox roller at 2–4 g/m² wet film weight and dried with hot air at 70–90 °C for 1.5–2.5 s. Blocking resistance is measured at 50 °C and 70 kPa pressure for 24 h; scuff resistance is assessed by ASTM D5264 Sutherland rub. The relevant compliance boundary for indirect food contact is the EuPIA Good Manufacturing Practice for Food Contact Materials, with reference to Article 3 of Regulation (EC) No 1935/2004. Finished articles are frozen food cartons, pharmaceutical secondary cartons, beverage multipacks, and dry cereal boxes. The addition must be completed below 40 °C, since higher temperatures reduce the powder’s ability to protrude from the film surface and diminish slip.
`Competitive Arkema Rilsan Fine Powders T GREY 7458 PA11 prices that fit your budget—flexible terms and customized quotes for every order.
For samples, pricing, or more information, please contact us at +8615365186327 or mail to admin@ascent-chem.com.
We will respond to you as soon as possible.
Tel: +8615365186327
Email: admin@ascent-chem.com
Flexible payment, competitive price, premium service - Inquire now!
Arkema Rilsan Fine Powders T GREY 7458 PA11 is a thermoplastic polyamide 11 coating powder supplied as a fine grey particle-size grade for fluidized-bed dipping, electrostatic spray deposition, and rotational lining of preheated metallic components. The base polymer is synthesised from 11-aminoundecanoic acid and forms a semi-crystalline film upon melting and coalescence. Published general values for PA11 coating powders include a melting peak between 183–186 °C when measured according to ISO 11357-3 and a solid density of 1.04–1.05 g/cm³ according to ISO 1183-1. The T designation identifies a fine powder cut intended for thin-film formation; the grey 7458 pigment code provides a neutral grey finish. Because pigment loading influences melt rheology, leveling, and barrier performance, grade-specific certificates of analysis should be consulted before production release.
Typical applications include corrosion protection of dishwasher baskets, automotive fluid lines, outdoor furniture, valve bodies, and architectural hardware. These applications use film thicknesses from 80 µm to 300 µm, depending on the deposition method. The fused PA11 film provides a low coefficient of friction, ductility at sub-zero temperatures, and resistance to salt spray and automotive fluids. In salt-spray testing according to ISO 9227, phosphated steel panels coated with unfilled PA11 at 150–250 µm commonly withstand 1000 h without red rust; this value should be validated for T GREY 7458 because pigment concentration and film thickness influence barrier performance.
The chemical distinction between PA11 and PA12 is amide-group spacing: PA11 contains one amide group per 11 carbon atoms, while PA12 contains one amide group per 12 carbon atoms. This yields a higher crystalline melting point for PA11 at 183–186 °C compared with 176–180 °C for PA12 under ISO 11357-3. PA11 is partially derived from castor oil through 11-aminoundecanoic acid, whereas PA12 is typically petrochemical; the actual bio-based carbon content of T GREY 7458 should be verified by ASTM D6866 if product labelling requires it. Compared to epoxy powder coatings, PA11 is a thermoplastic and does not require a thermoset cure schedule; film formation depends on melting and coalescence on a preheated substrate. Epoxy systems may provide higher Shore D hardness and better adhesion to bare steel, but PA11 offers elongation at break above 200% and lower brittle failure at low temperature. PA11 also permits thermal repair of localised defects, while epoxy coatings are crosslinked and cannot be reflowed.
| Property | Test method | PA11 | PA12 | Epoxy powder |
|---|---|---|---|---|
| Melting peak | ISO 11357-3 | 183–186 °C | 176–180 °C | No melt peak; Tg 50–80 °C |
| Density | ISO 1183-1 | 1.04–1.05 g/cm³ | 1.01–1.02 g/cm³ | 1.2–1.4 g/cm³ |
| Tensile strength | ISO 527-3 | 30–45 MPa | 30–45 MPa | 40–60 MPa |
| Elongation at break | ISO 527-3 | 200–350% | 200–350% | 1–5% |
| Shore D hardness | ISO 868 | 65–70 | 60–65 | 75–85 |
| Water absorption 24 h | ISO 62 | 0.3% | 0.2% | 0.5–1.0% |
Fluidized-bed dipping with T GREY 7458 PA11 requires degreasing, blast cleaning to Sa 2.5 under ISO 8501-1, and zinc or iron phosphate conversion coating at 1.5–3.0 g/m². Substrates are preheated to 250–350 °C, with hold time determined by part mass. Immersion of 3–8 s in an aerated powder bed produces a fused deposit; post-fusion proceeds at 190–210 °C for 2–5 min. On production-scale fluidized beds, air flow is typically adjusted between 5 and 15 m³/h per square metre of bed area to maintain homogeneous fluidization without channelling. A recurring production defect is edge pull-back on sharp corners; edge radiusing to at least 0.5 mm and edge-focused preheat reduce this failure. The fine particle size gives smoother films at 80–150 µm, but high humidity above 60% RH can cause powder agglomeration in hoppers; sealed storage and vibratory sieving are required before use.
Adhesion of the fused coating is verified by crosshatch test under ISO 2409; rating 0 or 1 is required for corrosion-critical parts. On zinc-phosphated steel, failure is typically cohesive within the PA11 layer rather than at the steel interface when pretreatment is consistent. Pull-off adhesion testing according to ISO 4624 on 150–250 µm PA11 films commonly exceeds 15 MPa, although zinc phosphate conversion coating weight outside 1.5–3.0 g/m² can reduce this value. Cathodic disbanding resistance in immersion is assessed by ISO 15711; PA11 coatings show limited under-film corrosion creep when the phosphate layer is intact.
Particle size distribution is measured by laser diffraction according to ISO 13320-1. Fine powder grades for electrostatic application generally exhibit a median particle size below 100 µm; fluid-bed grades may be coarser. Tapped density of PA11 fine powders, as measured by ISO 787-11, is approximately 0.45–0.55 g/cm³. The powder does not require drying when stored below 60% RH. Melt flow rate of the base PA11 at 235 °C/2.16 kg under ISO 1133-1:2022 is not a primary film-performance indicator but can be used as an incoming lot consistency check. For a 150–250 µm fused film on phosphate-treated steel, typical unfilled PA11 values include tensile strength of 30–45 MPa under ISO 527-3, elongation at break of 200–350%, Shore D hardness of 65–70 under ISO 868, and water absorption of 0.3% at 24 h under ISO 62. Published data for the grey 7458 pigment package is limited; mechanical values may shift by 5–10% depending on pigment concentration and dispersion.
Film gloss and colour consistency are evaluated by ISO 2813 and ISO 11664-4. Grey 7458 is a pigment code, not a gloss specification; gloss can range from 20–70 GU at 60° depending on peak metal temperature and powder melt viscosity. Thickness measurement on production parts is performed by eddy current gauges calibrated against ISO 2360. The glass transition temperature of PA11 is approximately 40–50 °C, which supports ductile behaviour at low temperatures. The brittleness temperature under ISO 974 can be below -40 °C for impact-modified grades, but T GREY 7458 must be checked for low-temperature impact if used in Arctic service.
Corona charging is commonly set at 60–100 kV, with powder output of 50–200 g/min and atomising air pressure of 0.5–2.5 bar. The grey 7458 pigment can alter charge acceptance compared with unpigmented PA11; line trials should establish the optimum charging voltage and gun-to-part distance. Preheating metal to 200–250 °C before electrostatic spray reduces back-ionisation and improves edge coverage in Faraday cage regions. Post-fusion at 190–210 °C for 3–5 min completes film formation. Film thickness should be maintained between 80 µm and 300 µm. Thickness below 80 µm creates a risk of corrosion failure on edges and weld zones; thickness above 300 µm can produce internal stress and delamination during cooling. In high-humidity plants above 50% RH, powder feed hoppers should be purged with dry air at a dew point of -40 °C to prevent tribo-charging instability.
| Process | Preheat temperature | Film thickness | Post-fusion cycle | Key control limit |
|---|---|---|---|---|
| Fluidized-bed dipping | 250–350 °C | 150–300 µm | 190–210 °C for 2–5 min | Part thermal mass |
| Electrostatic spray | 200–250 °C | 80–150 µm | 190–210 °C for 3–5 min | Faraday cage shadowing |
| Rotational lining | 220–280 °C | 250–500 µm | 190–210 °C for 5–10 min | Rotation uniformity |
Chemical resistance of the fused PA11 film is governed by the amide linkage and semi-crystalline morphology. Immersion testing under ISO 175 indicates retention of tensile properties after exposure to aliphatic hydrocarbons and diesel fuel at 23 °C for 1000 h, but methanol at concentrations above 15% causes plasticisation and should be avoided. Concentrated mineral acids, phenols, and oxidising agents attack the polyamide chain; immersion in these media is not recommended. The maximum continuous service temperature for PA11 coatings under mechanical load is typically 90–120 °C; exposure above 120 °C accelerates oxidative degradation. For food contact or potable water service, grade-specific approvals such as FDA 21 CFR 177.1500, NSF/ANSI 61, or ACS must be verified for T GREY 7458. Global regulatory compliance under EU Regulation 1907/2006 (REACH) and EU Directive 2011/65/EU (RoHS) should be confirmed through the safety data sheet.
Incoming powder lots are assessed for moisture content, particle size distribution, and colour variation. Batch-to-batch shifts in median particle size of 5–10 µm can alter electrostatic transfer efficiency and film smoothness; this is a more frequent source of process variability than melt viscosity. Because no thermoset crosslinking occurs, the deposited film remains thermoplastic. Localised defects can be repaired by reheating the damaged area to 230–260 °C and applying additional powder; repeated reheating cycles may cause yellowing or gloss reduction. Published data for this specific configuration is limited when the repair process is applied more than twice, and validation on representative parts is required.
Within the Rilsan Fine Powders portfolio, T GREY 7458 PA11 differs from natural or white PA11 fine powders primarily in pigment package and charge acceptance. Compared with larger-particle fluid-bed grades, it is optimised for thinner deposits and smoother surfaces. Compared with Rilsan PA12 powders, the PA11 grade offers a higher melting point and a different balance of moisture uptake and hydrocarbon resistance. The selection of T GREY 7458 over a PA12 grey powder is typically made when the service temperature, bio-based content, or specific mechanical performance of PA11 is required.
