| HS Code | 344632 |
| Polymer | Polyamide 11 (PA11) |
| Form | Fine powder |
| Color | Silver |
| Specific Gravity | 1.04 g/cm³ |
| Bulk Density | 0.55 g/cm³ |
| Melting Point | 186 °C |
| Glass Transition Temperature | 45 °C |
| Particle Size D50 | 70 µm |
| Particle Size D90 | 150 µm |
| Tensile Strength | 42 MPa |
| Elongation At Break | 250% |
| Shore D Hardness | 72 |
| Water Absorption | 1.8% at saturation |
As an accredited Arkema Rilsan Fine Powders T SILVER 1058 BC PA11 factory, we enforce strict quality protocols—every batch undergoes rigorous testing to ensure consistent efficacy and safety standards.
| Packing | Supplied in 20 kg sealed cardboard boxes, this fine silver PA11 powder is packaged for safe handling, transport, and storage. |
| Container Loading (20′ FCL) | 20′ FCL container loading of Arkema Rilsan Fine Powders T SILVER 1058 BC PA11, safely packed in dry, stable conditions. |
| Shipping | Shipped as a non-hazardous fine polymer powder in sealed, moisture-resistant bags on pallets. Protect from humidity, excessive heat, and direct sunlight. Avoid dust generation and ignition sources. Store in a cool, dry, ventilated area. Standard ground or freight transport is acceptable with proper labeling and handling procedures. |
| Storage | Store in original, tightly sealed container in a cool, dry, well-ventilated area. Keep away from heat, open flames, sparks, and direct sunlight. Protect from moisture and humidity to prevent powder agglomeration. Maintain ambient temperature and avoid dust accumulation. Ensure containers are clearly labeled and inaccessible to unauthorized personnel. |
| Shelf Life | Shelf life is typically 2 years from manufacture when stored unopened, cool, and dry in original packaging. |
Preheat temperature control on continuous automotive tube coating lines is the first processing boundary for Rilsan Fine Powders T SILVER 1058 BC PA11. Zinc-phosphated steel brake tube is conveyed through a radiant oven, where the line speed is adjusted so that the metal surface enters the fluidized bed at 270–300°C; oven setpoints between 300–330°C are required because transfer time of 2–4 s from oven exit to powder contact removes measurable heat. The PA11 fine powder fuses within 8–12 s of contact at this surface energy input, forming a dense layer without primer. Water quenching at 20–40°C immediately after fusion lowers the crystalline fraction and reduces the likelihood of brittle failure during tube bending. Adhesion is assessed by cross-cut testing per ISO 2409:2013 or pull-off testing per ISO 4624:2016; production records for this substrate commonly show cross-cut classification 0–1 on 2 mm lattice spacing after 72 h water immersion at 40°C. Terminal parts include brake tube assemblies, fuel vapor purge lines, and pneumatic control conduits. A defined boundary exists: this grade is not intended for continuous immersion in concentrated mineral acids above 10 wt% at elevated temperature. Published data for long-term chemical exposure of this exact silver-pigmented fine powder configuration is limited, so qualification tests should be run against the specific brake fluid or road salt solution in use.
On batch lines for dishwasher baskets, steel wire is resistance-welded, degreased, and immersed in a fluidized bed at preheat temperatures between 290°C and 310°C. Above 310°C, melt flow on vertical wires produces drips and thin edges at weld intersections; below 270°C, the powder does not fully coalesce around wire diameters below 2 mm, leaving uncoated crevices that capture detergent. The coating thickness for this product is specified at 300–500 µm on the outer wire surface, while hidden contact points between intersecting wires typically retain 150–250 µm. Detergent immersion testing uses a 1% alkaline solution at 70–80°C for 500–1000 h under ISO 2812-1; the silver-pigmented PA11 layer should show no visual deterioration, though gloss reduction is accepted on production parts. The base polyamide 11 resin is listed in 21 CFR 177.1500; the silver-pigmented grade requires additional pigment purity verification before food-contact use. Powder moisture content must remain below 0.15 wt% because steam pinholes form during fusion if higher moisture is present. Pre-drying at 80°C for 3–4 h is required after storage at relative humidity above 60%. Terminal products include dishwasher baskets, cutlery baskets, and washing machine drum paddles.
Electrical busbar and battery busbar coating uses corona electrostatic guns operating at 60–90 kV with a gun-to-target distance of 150–250 mm. The substrate is preheated to 180–220°C, which is lower than fluidized bed preheat because the powder deposit is thinner and electrostatic wrap assists edge coverage. Dry film thickness ranges from 120–200 µm on flat copper sections; edges receive 80–120 µm depending on orientation and gun position. Transfer efficiency for fresh powder on simple geometries is typically 55–75%, and closed-loop reclaim of overspray is standard when the reclaimed powder is sieved through a 125 µm screen and blended with virgin powder at a ratio no higher than 30:70 reclaimed to virgin. Dielectric strength is measured according to IEC 60243-1 and comparative tracking index according to IEC 60112; published data for this exact silver-pigmented grade on busbar geometries is limited, so specimen-level laboratory values should be verified before production release. RoHS compliance is addressed under 2011/65/EU at the finished-component level. End products include insulated busbars, capacitor cans, and electric vehicle power distribution modules. The presence of silver pigment can alter space-charge behavior under direct-current conditions; qualification at 500 V DC and 1000 V DC is advisable before use in high-voltage assemblies.
Cast iron and ductile iron valve bodies for potable water distribution are coated by fluidized bed dipping after shot blasting to ISO 8501-1 Sa 2½ and zinc phosphate treatment per ISO 9717. Preheat temperature is held at 300–340°C because the thermal mass of a DN50–DN150 body causes a 20–40°C drop during transfer from oven to fluid bed. The part remains in the bed for 90–180 s; the resulting lining is 300–600 µm on external faces and 250–350 µm inside threaded ports. Post-fusion at 180°C for 10–15 min completes crystallization and reduces internal stress. Potable water compliance is evaluated under NSF/ANSI/CAN 61; the specific T SILVER 1058 BC grade is used in cold-water service up to 23°C, with derating above 60°C continuous. In the UK market, WRAS approval is product-specific and must be confirmed against the final coated component. End products include gate valve bodies, check valve housings, and backflow preventer internals. A process incompatibility exists with amine-cured epoxy primers: residual amine can yellow the PA11 and interfere with fusion at the interface.
| Application | Surface preparation | Coating process | Typical film thickness | Key standards |
|---|---|---|---|---|
| Automotive brake tubes | Zinc phosphate per ISO 9717 | Fluidized bed dip | 200–350 µm | ISO 4624, ISO 2409 |
| Dishwasher baskets | Degrease, blast | Fluidized bed dip | 300–500 µm | ISO 2812-1 |
| Electrical busbars | Degrease | Electrostatic spray | 120–200 µm | IEC 60243-1, IEC 60112 |
| Valve bodies | Sa 2½ blast, zinc phosphate | Fluidized bed dip | 300–600 µm | NSF/ANSI/CAN 61 |
| Architectural hardware | Degrease, conversion coating | Electrostatic spray | 80–120 µm | ISO 4892-2 |
| Marine fasteners | Degrease, grit blast | Fluidized bed dip | 250–400 µm | ISO 9227, ISO 6272 |
Architectural hinges, handles, and façade brackets made from aluminum or stainless steel are coated by electrostatic spray at preheat temperatures between 190°C and 220°C. The film is thinner than fluidized bed deposits, usually 80–120 µm, because edge aesthetics and dimensional tolerance are critical on concealed bearing surfaces. PA11 provides higher impact resistance than epoxy at equal thickness, but its glass transition temperature near 40–45°C means that dark-surface heat buildup in full sun does not cross that boundary for most temperate locations. Accelerated weathering under ISO 4892-2 or ASTM G154 for 1500–2000 h shows no rust creep at scribe; direct color shift data for this silver-pigmented grade is not published, so batch-to-batch pigment loading must be recorded. End products are façade support brackets, railing stanchions, and door furniture. The powder should not be applied over acid-curing silicone sealants; acetic acid release during cure produces surface haze and interferes with film coalescence.
Offshore and marine fasteners of 316L stainless steel or high-tensile steel are coated in a preheated powder bed at 280–300°C to produce a 250–400 µm film. The key property is not absolute thickness but fusion density, which is controlled by cooling rate: water quenching at 20°C yields lower crystallinity and fewer micropores than slow air cooling at 1°C/min, improving barrier resistance to chloride ingress. Salt spray testing per ISO 9227:2017 for 1000 h on scribed panels is the standard acceptance criterion, but fastener threads require mandrel bend or impact testing per ISO 6272 because thread roots concentrate stress. End products include bolted flanges, cable tray clips, and pump mounting studs. This grade is not recommended for continuous immersion in seawater above 40°C at hydrostatic pressures exceeding 1 MPa, because water uptake and plasticization accelerate in the PA11 amorphous segment; published data for this specific configuration is limited.
Textile draw rollers and guide rollers are coated by fluidized bed dipping at 250–350 µm dry film thickness after preheat to 280–300°C.
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Arkema Rilsan Fine Powders T SILVER 1058 BC PA11 is a thermoplastic polyamide 11 powder coating material supplied for electrostatic spray, fluidized-bed dipping, electrostatic fluidized-bed, and minicoat deposition. The base polymer is produced from 11-aminoundecanoic acid derived from castor oil; the fine powder is cryogenically ground, air-classified, and pigmented to produce a silver-effect metallic finish. Unlike epoxy, polyester, or hybrid thermosetting powders, this material does not crosslink during cure. It is fused above the PA11 crystalline melt peak and solidifies by recrystallization on cooling. Typical unfilled Rilsan PA11 coating powder data include density 1.04 g/cm³ (ISO 1183-1), melt temperature 186 °C (ISO 11357-3), Shore D hardness 70 (ISO 868), tensile strength 45 MPa (ISO 527-2), elongation at break >200 % (ISO 527-2), and saturation water absorption 1.9 % (ISO 62). For T SILVER 1058 BC, metallic flake addition alters melt-flow and tensile elongation; the specific numerical deviations should be taken from the certificate of analysis because published data for this exact configuration is limited. The product is specified for metal parts requiring combined impact resistance, abrasion resistance, chemical resistance, and a specified silver appearance.
The silver effect is generated by metallic flakes dispersed in the PA11 matrix. Because the flakes are not encapsulated in a clear topcoat, the surface finish is sensitive to handling, cleaning, and abrasion. Surface roughness and gloss should be specified with a glossmeter per ISO 2813 and a surface profilometer; production lots may show variation in flake orientation. The product is not a direct substitute for chrome-plated or physical-vapour-deposited metallic surfaces but is used where sacrificial impact resistance and corrosion protection are required with a bright metallic appearance.
Polyamide 11 is a semi-crystalline thermoplastic with a ductile deformation mode. In contrast to thermoset epoxy-polyester hybrid films, which exhibit brittle crack propagation at low strain, PA11 coatings maintain tensile elongation above 200 % (ISO 527-2). Impact resistance of coated panels is assessed by rapid-deformation testing according to ASTM D2794 and cylindrical bend testing according to ISO 1519; PA11 films at 300–400 µm dry-film thickness typically do not crack when the metal substrate is degreased and phosphated. Abrasion resistance is evaluated by ASTM D4060 with a Taber abrasion apparatus; acceptance limits are specified by the end-use standard rather than by a universal value. Salt-spray corrosion performance is assessed by ISO 9227; coated panels with intact film show reduced scribe creep after prolonged neutral salt-spray exposure, but the exact duration depends on substrate preparation, dry-film thickness, and edge geometry. These properties explain selection in dishwasher-basket coating, valve and pump components, automotive clips, and architectural hardware where impact, flexure, and hot alkaline cleaning agents act simultaneously. The upper continuous service temperature is below the melting point; repeated exposure above 100 °C can soften the film and should be avoided unless the mechanical load is low.
Chemical resistance of PA11 is documented against fuels, oils, greases, and aqueous salt solutions. In immersion testing according to ISO 175, unfilled PA11 retains mechanical properties after prolonged exposure to aliphatic hydrocarbons and mineral oils at ambient temperature. Strong acids, strong bases, and phenolic solvents attack polyamide 11; the film is not recommended for continuous immersion in strong hydrochloric acid or in phenolic cleaning agents at elevated temperature. The silver pigment may additionally react with oxidizing acids or chlorinated solvents; compatibility testing according to ISO 175 should be performed for each cleaning regime before production approval.
On production-scale electrostatic lines, the powder is charged with a corona gun operating at 60–100 kV and applied to a grounded, preheated substrate at a gun-to-part distance of 150–250 mm. Compressed air for fluidization is dried to a pressure dew point below -20 °C to limit agglomeration. Preheat temperatures for Rilsan PA11 in electrostatic spray are commonly held between 200 °C and 250 °C; industrial settings vary with part mass and required film build. In fluidized-bed dipping, parts are heated above the powder fusion point, immersed in the fluidized bed, and then allowed to flow out in a heated zone. The T SILVER 1058 BC grade contains metallic flake, so its charge-to-mass ratio is not identical to that of non-metallic Rilsan fine powders. On some lines, transfer efficiency falls when the reclaim ratio exceeds 20:1 because fines and metallic flakes separate in the reclaim loop. Tribo-charging is evaluated as an alternative when corona charging produces spitting or back ionization on thin-section areas.
Adhesion to steel and aluminum requires removal of scale, rust, and drawing lubricants. A zinc phosphate conversion coating or grit-blasting to a surface profile of 50–75 µm is commonly used before PA11 powder application. Without mechanical anchor, PA11 coatings can delaminate under impact because of their thermoplastic nature. A primer is generally not required for PA11 if the surface is correctly prepared, but a phenolic or epoxy primer may be used where wet adhesion is critical.
PA11 is hygroscopic. Saturation water absorption is 1.9 % (ISO 62). Powder that has been stored open in production environments above 60 % RH can accumulate sufficient surface moisture to produce pinholes, micro-voids, and melt-viscosity reduction during fusion. Conditioning in a desiccant dryer at 80 °C to a residual moisture content below 0.2 % by Karl Fischer titration (ISO 15512) is required before fluidized-bed use when the powder has been exposed to humid air. In fluidized-bed hoppers, membrane dryers or desiccant-wheel dryers with a supply dew point below -20 °C are used to maintain the powder at a stable moisture level. Moisture-related defects are typically seen as cratering, bubble entrapment at the coating-substrate interface, or reduced film gloss. These defects cannot be corrected by extending oven dwell time because the moisture is trapped within the fused thermoplastic film.
| Property | PA11 basis | PA12 reference | Test method |
|---|---|---|---|
| Density | 1.04 g/cm³ | 1.01 g/cm³ | ISO 1183-1 |
| Melt temperature | 186 °C | 176 °C | ISO 11357-3 |
| Shore D hardness | 70 | 65 | ISO 868 |
| Saturation water absorption | 1.9 % | 1.5 % | ISO 62 |
| Tensile elongation | >200 % | >200 % | ISO 527-2 |
Values are representative of unfilled base resins. The pigmented T SILVER 1058 BC grade may exhibit lower elongation, altered density, and modified surface resistivity due to metallic flake content.
Substitution of T SILVER 1058 BC for natural Rilsan in an existing coating cell is not a drop-in change. Metallic flake orientation in a thermoplastic matrix depends on melt viscosity and cooling rate. Excessive preheat temperature or extended dwell time can allow flake migration and produce a non-uniform silver appearance known as flake mottling. Quench cooling can freeze flakes near the surface and create a flake-rich outer layer with reduced abrasion resistance. Melt-flow rate of the base PA11 is determined by ISO 1133-1 at 235 °C with a 2.16 kg load; typical unfilled PA11 coating grades are in the 5–20 g/10 min range, but metallic pigment reduces flow. Powder dry-flow and apparent density, measured by ISO 6186 and ISO 60, should be part of incoming inspection because reclaim behavior depends on particle size distribution and flake geometry. Particle size distribution is determined by laser diffraction per ISO 13320; for electrostatic spray, D10, D50, and D90 are primary control parameters. A lot-to-lot shift of D50 by more than 10 µm can alter powder cloud density and film build at fixed gun voltage.
The T SILVER 1058 BC grade differs from unfilled Rilsan Fine Powders primarily in optical and electrostatic behavior. The metallic pigment package reduces dry-film electrical resistance. Unfilled PA11 is an electrical insulator with volume resistivity generally above 1 × 1014 Ω·cm (IEC 62631-3-1); a silver-filled film may show lower surface resistance. This shift must be considered where dielectric strength or electrostatic dissipative performance is specified. The grade also differs from thermosetting epoxy powders because it does not cure by chemical crosslinking and remains thermoplastic at room temperature. Compared with PA12 fine powders, PA11 has a higher melt temperature and higher hardness, with slightly higher saturation water uptake. Selection of T SILVER 1058 BC is appropriate when the specification requires simultaneous impact toughness, scuff resistance, chemical resistance, and a specified silver appearance on metal parts.
For food-contact applications, the base PA11 homopolymer is referenced in FDA 21 CFR 177.1500 for nylon resins, subject to end-testing for specific migration. The silver pigment and any external lubricants must be evaluated separately under EU 10/2011. The product is not automatically compliant with drinking-water standards such as NSF/ANSI 61 or WRAS; certification for the finished article is required for potable-water contact. For electrical and electronic equipment, compliance with RoHS Directive 2011/65/EU must be verified on the finished coated component. REACH Regulation (EC) No 1907/2006 requires SVHC screening of the full mixture, including the metallic pigment package.
| Standard or regulation | Scope | Function in qualification |
|---|---|---|
| FDA 21 CFR 177.1500 | Nylon resins for food-contact articles | Base resin reference; final article must meet migration limits |
| EU 10/2011 | Plastics intended for food contact | Overall migration and specific migration of pigment components |
| REACH (EC) No 1907/2006 | Registration, evaluation, authorisation, restriction of chemicals | SVHC screening of full powder mixture |
| RoHS 2011/65/EU | Restriction of hazardous substances in EEE | Applicable if coated components enter electronic equipment scope |
| ISO 1183-1 | Density of non-cellular plastics | Incoming resin verification |
| ISO 11357-3 | DSC melting and crystallization | Fusion window determination |
| ISO 13320 | Laser diffraction particle sizing | D10, D50, D90 powder classification |
| ISO 15512 | Karl Fischer water content | Moisture control before fusion |
| ISO 9227 | Salt spray corrosion | Coated metal corrosion performance |
| ASTM D2794 | Rapid deformation impact resistance | Film toughness verification |
| ASTM D4060 | Taber abrasion | Wear resistance of cured film |
Storage in sealed containers at temperatures below 30 °C and relative humidity below 50 % is recommended. Powder contaminated with oil, rust, or moisture from spray booth floors should be discarded and not returned to the virgin hopper. The product should not be blended with epoxy or polyester powders; contamination introduces gels and loss of interlayer adhesion. If conversion from another powder chemistry is required, dedicated hoppers, hoses, and recovery filters are necessary to prevent cross-contamination in the reclaim loop.
