| HS Code | 337001 |
| Appearance | Colored, fine free-flowing powder |
| Bulk Density | 0.45 g/cm³ |
| Density Solid | 1.01 g/cm³ |
| Melting Point | 178 °C |
| Vicat Softening Temperature | 170 °C |
| Crystallinity | Semicrystalline |
| Particle Size D50 | 41 µm |
| Particle Size D90 | 90 µm |
| Water Absorption At 50 Rh | 0.5% |
| Water Absorption Saturation | 1.5% |
| Shore Hardness D | 75 |
| Tensile Strength | 40 MPa |
| Elongation At Break | 200% |
As an accredited Evonik VESTOSINT® 1141 colored Polyamide 12 factory, we enforce strict quality protocols—every batch undergoes rigorous testing to ensure consistent efficacy and safety standards.
| Packing | Supplied in 20 kg moisture-protected paper bags, palletized and labeled with product details, batch number, and handling instructions. |
| Container Loading (20′ FCL) | 20′ FCL: palletized bags of Evonik VESTOSINT® 1141 colored Polyamide 12, securely loaded, protected from moisture and contamination. |
| Shipping | VESTOSINT® 1141 colored Polyamide 12 ships as a free-flowing powder in moisture-protective bags, drums, or bulk containers. Transport under dry, ventilated conditions, avoiding excessive heat or humidity. Standard non-hazardous handling applies, though dust-control measures are recommended. Ensure secure palletization to prevent bag damage during transit. |
| Storage | Store VESTOSINT® 1141 colored Polyamide 12 in its original, tightly sealed container in a cool, dry place. Protect from direct sunlight and moisture, as humidity can affect powder flow and coating properties. Maintain temperatures below 25°C (77°F). Under these conditions, shelf life is typically 12 months from delivery. |
| Shelf Life | Store in original unopened containers, dry and cool. Shelf life is typically 2 years from production date. |
In commercial dishwasher basket coating lines, the colored VESTOSINT 1141 PA12 powder is typically processed by hot-dip fluidized-bed coating. Low-carbon steel wire baskets with diameters from 3.2 mm to 8.0 mm are first degreased in alkaline solution, rinsed, and then given an iron phosphate conversion coating in accordance with DIN EN 12476. The pretreatment layer weight should be maintained between 0.4 g/m² and 0.8 g/m²; higher phosphate mass can reduce the peel adhesion of the fused PA12 film. After drying, the baskets are preheated in a convection tunnel or infrared oven until the steel surface reaches 290–340 °C, measured by infrared pyrometer at the thickest wire junction rather than the oven air temperature. The preheated basket is immersed into a fluidized bed of VESTOSINT 1141 colored powder for 4–10 seconds, depending on the thermal mass of the part and the required film thickness. Fluidizing air pressure is typically maintained between 0.2 bar and 0.5 bar through a porous polyethylene distributor plate, and bed height is adjusted to avoid slugging at the part surface. The powder melts and coalesces on contact, producing a continuous film of 250–500 µm; corner and weld areas may build thicker films, which must be checked because colored pigments can alter the local melt rheology and reduce flow-out compared with uncolored PA12. When the basket emerges from the bed, residual substrate heat is usually sufficient to complete film formation, although parts with wire junctions above 10 mm cross-section may require a post-fusion oven dwell at 185–200 °C for 10–15 minutes. In production, adhesion is routinely tested according to ISO 2409 with a cross-cut spacing of 2 mm, and a rating of class 0 or 1 is expected. Impact resistance is checked with the ISO 6272-1 falling-weight test using a 1 kg indenter from 50 cm; film cracking or detachment at the scribe is rejected. Mechanical dishwashing resistance is evaluated by the EN 12875-1 test sequence with alkaline detergent at 65 °C, and gloss retention is recorded after 500 cycles. The colored variant requires a formal incoming pigment-dispersion check on each batch, because pigment agglomerates above 50 µm can survive the fusion step and create pinpoint surface defects that reduce detergent resistance in service.
High-volume automotive clip coating lines use corona-charged electrostatic spray booths rather than fluidized-bed immersion. The spring-steel or zinc-plated clips are loaded onto grounded racks, and the VESTOSINT 1141 colored powder is delivered through venturi pumps at 80–200 g/min per gun. Corona electrodes operate at 60–90 kV with total gun current limited to 10–40 µA; the gun-to-work distance is held between 150 mm and 300 mm to maintain transfer efficiency above 65% while minimizing back-ionization. Faraday penetration into the narrow gap between clip and rail is often the controlling defect source; reducing the powder delivery rate and increasing the number of reciprocator strokes improves coverage where the colored powder shows a slightly wider particle size distribution than clear grades. After deposition, the films are fused in a convection oven at 190–210 °C for 15–25 minutes, with the metal part temperature as the controlling variable and not the oven setpoint. A fused film thickness of 120–250 µm is typical on spring clips, and the cured coating is checked for cross-cut adhesion per ISO 2409 as well as mandrel bend performance using a 6 mm mandrel; the coating must not crack or detach at the bend. Corrosion performance is tested according to ISO 9227 neutral salt spray on scribed panels, with a maximum scribe creep of 2 mm after 500 hours being a common internal gate for this substrate class. The colored PA12 also provides noise-abatement and low slip friction on clip-to-plate interfaces; coefficient of friction should be measured according to ISO 8295, with typical static values between 0.25 and 0.40. Because pigment-containing powder can alter tribological response, an incoming-grade qualification panel is recommended for each pigment batch before release to the spray line.
When wheelchair rims and transfer-support rails are powder coated on stainless steel or aluminum, the thermal history must be restricted because the substrate gauge is often below 2 mm and distortion occurs above 200–220 °C. VESTOSINT 1141 colored PA12 is applied by either fluidized-bed dipping of preheated tubes at 270–300 °C or by electrostatic spray followed by a convection cure at 185–200 °C. Coating thickness is typically held between 150 µm and 350 µm on hand-contact surfaces; thicker films produce orange peel and reduce tactile quality, while thinner films show low gloss and poor edge coverage. Chemical resistance to hospital disinfectants is assessed by immersion in 70% isopropanol, 0.5% sodium hypochlorite, and quaternary ammonium solution per ISO 2812-1 at 23 °C for 24 hours, followed by a cross-cut adhesion check. The coating is acceptable only if gloss change is below 10 gloss units and no softening is detected with pencil hardness above HB per ASTM D3363. For devices that require biocompatibility data, the cured finish must be tested according to ISO 10993-5 cytotoxicity on extracts prepared under ISO 10993-12; the manufacturer must not rely on generic PA12 data, because pigments and grinding aids in colored powder may alter the extractables profile. Steam autoclave exposure at 134 °C is generally outside the recommended continuous service window of PA12 under load, and such parts should be validated by measuring adhesion after 5 autoclave cycles before release.
Commercial kitchen racks and preparation-table wire components are coated with the colored VESTOSINT 1141 powder to withstand repeated cleaning with acidic and oxidizing detergents. The critical process variable is film thickness at weld intersections, not average film thickness. On wire racks formed from 4 mm to 6 mm rod, the fused PA12 layer is specified at 200–400 µm on flat sections and at least 150 µm at the weld root. Preheat temperature should be limited to 280–310 °C for steel parts because colored pigments tend to reduce the thermal stability of the powder film at the upper end of the normal PA12 window, and local overheating appears as yellowish discoloration and reduced citric acid resistance. Citric acid testing is performed with 5% citric acid solution at 60 °C for 8 hours, after which the surface is examined for blistering and adhesion loss; acceptance is class 0 under ISO 2409. For food-contact articles intended for the European market, the finished article must satisfy the overall migration and specific migration requirements of Regulation (EU) No 10/2011 under the intended time and temperature conditions, and the responsible converter must generate compliance documentation because pigment systems are not automatically covered by generic PA12 certifications. In US jurisdictions, relevant coating end-use data are evaluated under FDA 21 CFR 175.300 for resinous and polymeric coatings, with extraction testing matched to the food type and use temperature. The colored powder is also checked for dry film coefficient of friction by ISO 8295; a static value above 0.45 can make rack movement difficult on polymer guide rails.
| Application | Standard / Method | Exposure or Test Condition | Acceptance Boundary |
|---|---|---|---|
| Dishwasher basket | EN 12875-1 | Alkaline detergent, 65 °C, 500 cycles | No blistering; adhesion class 0–1 per ISO 2409 |
| Automotive clip corrosion | ISO 9227 | Neutral salt spray, 5% NaCl, 35 °C, 500 h | Scribe creep below 2 mm |
| Medical mobility hardware | ISO 2812-1 | 70% isopropanol, 0.5% sodium hypochlorite, 24 h | Gloss change below 10 units; pencil hardness at least HB |
| Commercial kitchen rack | Citric acid immersion | 5% citric acid, 60 °C, 8 h | Class 0 adhesion per ISO 2409 |
| Marine deck hardware | ISO 9227 | Neutral salt spray, 1000 h | Scribe creep limit established on pre-production panel |
For exterior marine deck hardware fabricated from 316L stainless steel, colored VESTOSINT 1141 PA12 is occasionally applied to reduce glare and provide a non-marring surface. The coating must be applied at a minimum 250 µm dry film thickness and tested for scribe creep after 1000 hours of neutral salt spray per ISO 9227; published data for this specific colored PA12 configuration in marine service is limited, so a pre-production sea-trial panel is required before line qualification.
Spring units in seating and reclining furniture are coated with colored VESTOSINT 1141 to suppress metal-to-metal contact noise and to protect the spring wire from moisture-induced corrosion in transit. The springs are normally coated by electrostatic spray at 60–80 kV, or by fluidized-bed dipping where high edge coverage is required. Steel spring wire diameter ranges from 1.8 mm to 3.5 mm, and the thin cross-section demands a lower preheat temperature of 240–270 °C for dip coating because the entire wire reaches oven temperature rapidly. Fused film thickness on furniture springs is typically 80–180 µm; thicker films can alter spring constant and cause embrittlement at torsion points. Cure completion is verified by differential scanning calorimetry per ISO 11357-1 at 10 K/min under nitrogen, with the first heating scan showing no residual melting endotherm above 180 °C. The coated springs are subjected to 80,000 fatigue cycles at 1 Hz in a servohydraulic test frame, after which the coating must show no flaking or powdering at the contact points. The use of colored pigment raises the importance of dispersion control; pigment agglomerates above 25 µm can act as stress concentrators under cyclic loading and should be monitored by optical microscopy of microtomed cross-sections.
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Evonik VESTOSINT® 1141 colored Polyamide 12 is a dry, pigmented, semicrystalline PA12 powder produced for electrostatic spray and fluidized-bed dip coating of metallic substrates. The base resin is synthesized from laurolactam and compounded with heat-stable pigments before cryogenic size reduction. The resultant fused coating is specified where dry lubrication, electrical isolation, resistance to hot alkaline cleaning solutions, and friction control are required on formed wire, sheet steel, cast aluminum, and galvanized components. The PA12 backbone contains fewer amide groups per unit chain length than PA6 or PA66, which limits equilibrium moisture regain and reduces stiffness shift in humid service. Conditioning to ISO 62:2008 for 24 h at 23 °C typically yields water uptake below 0.7% for unfilled PA12 sheet, while PA6 sheet generally exceeds 2.0% under the same procedure. The 1141 colored grade carries a finer particle-size cut than natural coarser VESTOSINT grades; this permits pinhole-free fused films starting near 150 µm on smooth blasted steel, whereas coarser PA12 powders commonly require 250 µm or more. The product is applied to dishwasher baskets, medical device arms, automotive seat frames, and industrial levers. Specifications for colored variants are pigment-dependent; inorganic pigments raise specific gravity and dielectric charging, while organic pigments can shift melt rheology and heat stability. The following table lists representative physical data for the unpigmented matrix and optimally dispersed colored compounds; values are typical data rather than batch-release limits.
| Property | Test method | Typical value |
|---|---|---|
| Melting range | ISO 11357-1:2016 | 176–181 °C |
| Specific gravity | ISO 1183-1:2019 | 1.01–1.04 |
| Bulk density | ISO 60:1977 | 0.40–0.48 g/cm³ |
| Particle size d50 | ISO 13320:2020 | 40–60 µm |
| Melt flow rate | ISO 1133-1:2022, 190 °C/2.16 kg | 25–60 g/10 min |
| Tensile strength | ISO 527-1:2019 | 40–50 MPa |
| Elongation at break | ISO 527-1:2019 | 200–300% |
| Shore D hardness | ISO 868:2003 | 70–75 |
| Water absorption, 24 h | ISO 62:2008 | 0.5–0.7% |
The electrostatic application window for VESTOSINT® 1141 colored PA12 is controlled primarily by the particle-size distribution, bulk density, and surface moisture content. The d50 interval of 40–60 µm measured to ISO 13320:2020 provides sufficient fines for dense film packing but can reduce free-flowing hopper discharge when the powder has been stored above 60% relative humidity. Pre-drying is therefore required after humid storage; a convection oven set at 70–80 °C for 2–4 h is used in production to restore flowability without inducing thermal yellowing. Corona spray guns with maximum voltage capability of 100 kV are typically operated between 50 kV and 80 kV for the colored grade, with automatic reciprocator stroke speeds adjusted to maintain a film thickness of 150–250 µm on planar surfaces. Lower charging voltage is preferred when the pigment system contains conductive inorganic compounds, because excessive surface charge can produce back-ionization and orange peel on the fused layer. Venturi-pump powder delivery systems with fluidizing air pressures of 1.5–2.5 bar and powder feed rates of 50–150 g/min have been used on multi-gun lines for continuous wire goods. Transfer efficiency in recessed zones is frequently below that of flat plate targets; modified tribo guns or lower voltage settings reduce Faraday-cage occlusion but may require multiple passes to achieve edge coverage.
Adhesion of the fused coating to prepared steel is evaluated by cross-cut testing to ISO 2409:2020; a rating of 0–1 is expected on degreased and grit-blasted substrates with a surface profile of 25–50 µm. Substrates that retain oil films or phosphate crystals outside the specified profile generate adhesion loss at edges and should be rejected before preheat. The colored powder exhibits some difference in electrostatic saturation because pigments modify surface resistivity; therefore every new color batch is checked against a reference RAL panel and an electrostatic charge-to-mass ratio measurement using a Faraday pail. Published data for all pigment combinations is limited because each color formulation changes the charge acceptance rate and powder cloud density.
Pigment addition in VESTOSINT® 1141 colored Polyamide 12 introduces measurable changes in melt viscosity, thermal stability, and mechanical elongation. Inorganic pigments such as iron oxide, titanium dioxide, and mixed-metal oxides increase specific gravity and can reduce melt flow rate relative to the unpigmented base. The melt flow rate of the colored grade, measured to ISO 1133-1:2022 at 190 °C with 2.16 kg mass, is generally within 25–60 g/10 min; heavily pigmented variants may fall at the lower end of this interval. Organic pigments can exhibit thermal degradation above approximately 240 °C; therefore curing temperatures should not exceed 220 °C for extended dwell periods. The fusion window is narrower than for the natural grade because insufficient temperature fails to level pigment aggregates, while excessive temperature accelerates polymer oxidation at the pigment-polymer interface. Differential scanning calorimetry to ISO 11357-1:2016 shows crystalline melting near 176–181 °C, so oven set points of 180–200 °C are common for thin sections. Heavy steel sections require preheat temperatures above 250 °C to retain thermal mass for gelation; this practice is permissible only when dwell time is limited and when inorganic pigments dominate the formulation.
Elongation at break of the colored grade remains within 200–300% under ISO 527-1:2019 tensile testing, but high pigment loadings can move the material toward the lower end of this range. The operational boundary is therefore fixed by the color-matching requirement: a formulation with high hiding power may require a compromise in flexibility. The colored grade also differs from the natural base in its dielectric response. Carbon-black-containing variants should not be processed with high-voltage corona guns unless the voltage is reduced below 40 kV; otherwise the enhanced conductivity can cause short-circuit current paths and uneven film build. Combination with amine-based adhesion promoters is contraindicated because residual amines accelerate thermo-oxidative degradation of the PA12 matrix and cause premature crosslinking at the coating-substrate interface. For all colored batches, colorimetric control to CIE L*a*b* coordinates is performed using a spectrophotometer; the acceptance tolerance is typically ΔE ≤ 0.8 within a production lot and ΔE ≤ 1.5 across lots.
Fluidized-bed dip coating of a preheated steel or aluminum part with VESTOSINT® 1141 colored PA12 relies on conductive heat transfer from the substrate to fuse the powder. A porous polyethylene or sintered metal distributor plate with an air pressure drop of 2–4 kPa is used to maintain homogeneous fluidization. The substrate is preheated in a convection oven to 200–250 °C for steel sections up to 5 mm wall thickness; heavier sections are raised up to 280 °C to retain sufficient thermal mass for gelation. Immersion time is typically 2–8 s. Excessive immersion causes film overthickness and melt sagging; insufficient immersion produces pinholes at edges and inside perforated openings. After the part is withdrawn, residual thermal energy completes leveling for 5–10 min before cooling. The colored powder must be fluidized with dry air because moisture ingress above 0.5% by mass causes agglomeration and spitting at the distributor plate. Tank-side air preparation includes a refrigerated dryer and a coalescing filter delivering a pressure dew point below 3 °C.
Hollow and box-section parts shift the application from thermal fusion to electrostatic deposition, and the colored grade exhibits the expected Faraday-cage limitations. In production, electrostatic guns operating at 60–80 kV deposit powder on external flat faces more efficiently than inside concave radii. Transfer efficiency on recessed areas may fall below 60% when a single-pass corona system is used, requiring rotation of the part or the addition of opposing guns. The fused film thickness at sharp edges is typically lower than on adjacent planes because the electric field concentrates at the edge and then repels incoming charged powder. To counter this, the edge is preheated above 220 °C or the part is grounded through a rotating fixture. Tribo-charging provides a more uniform deposit in low-voltage powder clouds, but tribo guns deliver lower output and require careful control of powder moisture below 0.4%. The 40–60 µm d50 of the 1141 colored grade helps fill recessed zones because smaller particles follow low-velocity air streams more readily than coarser PA12 powders; however, too much fines can increase powder cloud fluctuation and reduce recovery from cyclones. Sieve analysis to ISO 8130-6:2021 is used to monitor oversize particles above 100 µm, which may be generated by reclamation systems and can degrade surface smoothness on hollow sections.
The principal differences between VESTOSINT® 1141 colored PA12 and natural VESTOSINT 1111 lie in particle-size distribution, film thickness capability, color incorporation, and electrostatic charging response. VESTOSINT 1111 is an uncolored or naturally pigmented grade with a coarser distribution; it is generally specified for thicker films above 250 µm on heavy steel parts. The 1141 colored grade is finer and permits thin films near 150 µm with improved surface smoothness, but its lower bulk density can reduce hopper throughput and requires more aggressive fluidization. Under ISO 60:1977, bulk density of the 1141 colored powder is typically 0.40–0.48 g/cm³, whereas coarser PA12 powders may exceed 0.50 g/cm³. The colored grade reduces secondary liquid painting because the pigment is dispersed in the polymer matrix; however, color range is limited by pigment heat stability at the 180–200 °C cure temperature. Natural VESTOSINT 1111 can be mixed with external dry-blend pigments, but this practice introduces color streaks and uneven charge acceptance; VESTOSINT 1141 colored avoids dry-blend inhomogeneity by pre-compounding the pigment before grinding. Compared with high-viscosity PA12 powders used for rotational molding, the 1141 colored grade has a higher melt flow rate under ISO 1133-1:2022, which supports smoother flow-out in thin electrostatic coatings but reduces sag resistance on vertical surfaces above 300 µm. The colored grade also differs from PA11 and PA6 coating powders in moisture uptake, with PA12 exhibiting lower equilibrium water absorption to ISO 62:2008 and lower shift in glass-transition-related stiffness after humidity exposure. Published data for the specific colored configuration in long-term outdoor weathering is limited; salt-spray performance of PA12 coatings is commonly evaluated by ASTM B117-19, but pass-fail values depend on substrate preparation, primer use, and film thickness. Compliance with food-contact use is possible for unpigmented PA12 referenced under FDA 21 CFR 177.1500; colored variants require pigment-specific clearance and are not automatically covered under the base polymer listing.
