| HS Code | 273724 |
| Product Name | Evonik VESTOSINT® 1111 natural color Polyamide 12 |
| Material | Polyamide 12 (PA12) |
| Form | Fine powder |
| Color | Natural / white |
| Mean Particle Size D50 | 80 µm |
| Particle Size Distribution | Fine and narrow |
| Bulk Density | 0.55 g/cm³ |
| Solid Density | 1.01 g/cm³ |
| Melting Point | 178 °C |
| Moisture Absorption | Low |
| Solubility In Water | Insoluble |
| Flowability | Free-flowing |
| Thermal Processing Range | 175–200 °C |
As an accredited Evonik VESTOSINT® 1111 natural color Polyamide 12 factory, we enforce strict quality protocols—every batch undergoes rigorous testing to ensure consistent efficacy and safety standards.
| Packing | Evonik VESTOSINT® 1111 natural color Polyamide 12 fine powder, supplied in sealed 20 kg cardboard boxes with inner liner for safe handling. |
| Container Loading (20′ FCL) | Polyamide 12 powder in sealed bags, loaded into 20′ FCL, secured safely, protected from moisture and contamination. |
| Shipping | Evonik VESTOSINT® 1111 natural Polyamide 12 is a fine powder shipped in sealed moisture-proof bags or drums. It is non-hazardous under normal transport, requiring dry, ventilated conditions away from heat and ignition sources. Handle gently to minimize dust; ambient temperature shipping is standard, with no special hazmat restrictions. |
| Storage | Store Evonik VESTOSINT® 1111 natural color Polyamide 12 in its original, unopened container in a cool, dry, well-ventilated area. Avoid exposure to excessive heat, direct sunlight, and moisture or humidity, which can cause clumping or degradation. Keep containers tightly sealed when not in use. Under proper conditions, shelf life is approximately two years from delivery. |
| Shelf Life | Shelf life: 2 years from production if stored unopened, cool, and dry. Avoid moisture and direct sunlight. |
For VESTOSINT 1111 natural colour polyamide 12, the primary constraint in dishwasher rack coating is not melt flow but heat transfer into mid-diameter steel wire. In production-scale fluidized bed immersion lines, wire of 3.0–5.0 mm diameter is passed through a continuous gas-fired preheat tunnel; the part surface temperature immediately before immersion is controlled at 300–350 °C depending on wire mass and conveyor speed. The powder is fluidized in a vessel with compressed air dried to a pressure dew point of ≤ −40 °C; fluidizing air pressure is maintained at 0.2–0.5 bar to prevent channelling. On withdrawal, a fusion layer of 250–400 µm is formed. Film thickness is verified with ISO 2178:2016 on a non-magnetic coating over a magnetic steel substrate. Adhesion after conditioning is assessed by ISO 2409:2020 cross-cut rating, with acceptance not lower than grade 1 on welded intersections. The powder feed is 100 wt% VESTOSINT 1111 natural; if colour is required, a PA12-based pigment masterbatch is added at 2–4 wt% of total powder mass, and the active VESTOSINT 1111 fraction becomes 96–98 wt%. For natural colour use, the coating is positioned for repeated-use food contact under FDA 21 CFR 175.300 and EU Regulation (EU) No 10/2011 when final parts are washed and conditioned before first use. The coated rack is assembled into dishwasher baskets and cutlery holders. The dominant failure mode observed on continuous lines is thin coverage at wire crossings because the overlapped joint acts as a local heat sink; production-scale lines address this by increasing preheat temperature by 5–10 °C for parts with high weld density, but preheat must not exceed 360 °C because oxidative discolouration of the polyamide 12 becomes measurable. Storage of powder at relative humidity above 60% RH requires pre-drying at 80 °C for 4 h to avoid pinholes and microvoids caused by steam evolution during immersion. Resistance to mechanical dishwashing is evaluated under EN 12875-1, and adhesion is re-checked after the dishwashing simulation to exclude interfacial degradation caused by combined detergent, water hardness, and thermal cycling.
In automotive clip and cable guide coating, VESTOSINT 1111 natural is applied as a 100% powder film at 80–120 µm dry film thickness. Stamped spring steel clips are first degreased in an alkaline immersion cleaner at 60–80 °C, rinsed, and zinc-phosphated according to DIN EN 12476. The parts are conveyed by chain-on-edge or overhead conveyor into a convection oven where the substrate surface reaches 220–250 °C before corona-charged electrostatic spray. Automatic guns operate at 60–80 kV and powder output of 80–150 g/min per gun, with recovery cartridges returning overspray to the virgin-material feed through a closed-loop sieve. Fusion and levelling are completed in a post-cure zone at 190–200 °C for 5–10 min or until the metal temperature reaches 185 °C. The cured film is tested under ISO 9227:2022 neutral salt spray for 480 h with no red rust at scribe; cyclic corrosion performance is evaluated under VDA 621-415. The component supplier operates within IATF 16949:2016 product approval and PPAP documentation requirements. The terminal parts include brake-line clips, cable guides, seat-track end caps, and fuel-tank strap isolators. Edge coverage is the critical process limit: on punched edges, film thickness can fall below 50 µm if the gun-to-part distance exceeds 250 mm or if reclaim powder exceeds 30% of total feed because reclaimed fines lower charge-to-mass ratio and reduce wrap-around. Specification enforcement therefore rejects parts with edge dry film thickness below 40 µm measured by ISO 2178:2016. Avoid combination with amine-based adhesion promoters or mineral-oil corrosion inhibitors that remain on the substrate, because these compounds generate gas bubbles and loss of intercoat adhesion during fusion.
VESTOSINT 1111 natural is deposited onto cold-rolled steel or stainless steel wire baskets by fluidized bed immersion at a dry film thickness of 200–350 µm. The powder is used without solvent or liquid carrier at 100 wt%. Substrate preparation involves alkaline degreasing, rinsing, and grit blasting to surface cleanliness Sa 2½ according to ISO 8501-1:2007; for indoor trolley use, blast profile is typically 30–50 µm Ry. The prepared basket is preheated to 300–340 °C in a continuous gas-fired tunnel, then immersed in an air-fluidized bed for 5–10 s. The post-fusion stage is carried out at 185–200 °C for a time sufficient to bring the coldest wire junction to ≥ 180 °C. Compliance is assessed under EN 1929-1:1998 for self-service trolley performance, with coating integrity evaluated by ISO 2409:2020 cross-cut and ASTM D2794-93(2019) direct impact at 1.8 J reverse impact without cracking. The terminal product is a supermarket shopping trolley basket, often with child seat hinge covers and lower shelf wirework. The most frequent manufacturing defect is incomplete fusion at weld junctions, which are heavier and lag the surrounding wire by 15–30 °C; production lines compensate by increasing preheat for baskets with more than 40 weld joints until junction temperature is within the 180–200 °C fusion band. Powder contamination with silicones or organic release agents must be avoided because intercoat adhesion loss is not recoverable by thermal reprocessing. Natural unpigmented PA12 is not specified for continuous outdoor UV exposure without carbon black or a weatherable additive package; exterior service therefore requires a separate specification and requalification under the relevant outdoor furniture or corrosion standard.
Commercial food-processing trolleys and bakery rack assemblies require a PA12 layer that withstands repeated washdown, starch residues, and incidental oil contact. VESTOSINT 1111 natural is applied at 150–250 µm dry film thickness from a 100% powder feed. The steel or stainless steel frames are degreased, rinsed, and dried; carbon steel is grit blasted to Sa 2½ per ISO 8501-1. The components are preheated to 300–330 °C in a convection oven, then coated either by electrostatic fluidized bed or by conventional fluidized bed immersion. Post-fusion at 185–200 °C is continued until the metal core reaches the lower melt endotherm of the PA12 powder. The terminal parts are baking racks, cooling racks, meat trolley frames, and catering tray supports. Regulatory compliance for food-contact use is anchored to FDA 21 CFR 177.1500 for polyamide resins and EU Regulation (EU) No 10/2011 as amended; overall migration testing is conducted under EN 1186-1 using food simulants selected according to final food type and contact duration. The operational boundary is that exposure to oven air above 220 °C leads to surface oxidation and yellowing of natural colour film; therefore the coating is specified only for racks used at ambient or mild warming conditions, not for direct flame, heating element contact, or high-temperature baking use. Exposure to strong oxidizing acids and steam at temperatures above 80 °C should also be excluded because hydrolysis of the polyamide backbone accelerates under those conditions.
Cast iron valve bodies and pipe fittings represent a deep-dive case because thermal mass and section thickness create a narrow processing window. VESTOSINT 1111 natural is applied at 300–600 µm dry film thickness as a 100% powder. The substrate is preheated in a forced convection oven; for cast iron parts with wall thickness 5–20 mm, the oven set point is 330–360 °C, and the part is held until the surface reaches 300–320 °C before immersion. The fluidized bed vessel is operated with dry air at a pressure dew point ≤ −40 °C and fluidizing air pressure adjusted to maintain a uniform powder cloud; for a 100 L vessel, bed height of VESTOSINT 1111 natural is maintained at 300–450 mm. Immersion time ranges from 8–20 s, and the part is then transferred to a post-fusion oven at 185–200 °C for 10–20 min. Coating thickness is measured by ISO 2178:2016 on magnetic cast iron; adhesion is tested by ISO 2409:2020; corrosion performance in industrial atmospheres is specified under ISO 12944-5:2019 for C4 high and C5-I medium corrosivity categories, with performance tested by ISO 12944-6:2018 cyclic ageing. The terminal products are cast iron valve bodies, pipe hangers, coupling halves, and actuator mounting brackets used in chemical distribution, water treatment, and mechanical engineering. The process limit is that section thickness differences of more than 15 mm within one casting produce a surface temperature spread of 20–30 °C after preheating; if the coolest area drops below 270 °C before immersion, insufficient melt adhesion results, while the hottest area above 350 °C risks oxidation. Avoid combination with amine-based surface conditioners or solvent-borne adhesion promoters that leave residues, because the residues generate gas bubbles and pinholing in the fused coating. Powder storage above 60% RH requires drying at 80 °C for 4 h prior to charging the fluid bed. Batch-to-batch bulk density variation should be monitored against the supplier certificate of analysis; where published data for a specific casting configuration is limited, pre-production trial runs with thickness mapping at the thinnest and thickest sections are used to establish the immersion time window.
Handles, levers, tension springs, and retaining brackets are coated with VESTOSINT 1111 natural as a thin film of 100–200 µm from 100% powder. Small parts are processed on a chain-on-edge conveyor with automatic electrostatic guns at 60–80 kV, part-to-gun distance 150–250 mm, and powder output 80–150 g/min per gun. The substrate is preheated to 220–250 °C; post-fusion is performed at 190–200 °C for 3–8 min, and parts are cooled by ambient air or low-pressure blown air. The cured coating is evaluated under ISO 9227:2022 salt spray at 240 h for light-duty indoor parts and 720 h for on-machine components, with cross-cut adhesion per ISO 2409:2020 and impact per ASTM D2794-93(2019). The terminal parts include control levers, hand wheels, spring covers, locking tabs, and slide rail spacers in industrial machinery. The final assembly falls under Machinery Directive 2006/42/EC; the coating itself is qualified within the supplier component approval process. A known failure mode on high-speed lines is back-spraying into the preheat tunnel causing powder particles to fuse on quartz heating elements; this is controlled by recirculation airflow and infrared tunnel design with negative pressure at the entrance. The coating is limited to operating environments below 120 °C continuous dry heat because PA12 softens progressively above its glass transition and loses load-bearing hardness. For parts with threaded sections or close-tolerance bores, masking is required before coating because the 100–200 µm layer cannot be mechanically removed from internal threads without damaging the fused polyamide surface.
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VESTOSINT® 1111 is a natural, unpigmented polyamide 12 (PA12) coating powder supplied by Evonik Industries. It is intended for dry-coating of formed metal parts, wire goods, appliance baskets, and process equipment components where a fused film must provide dry-running wear resistance, corrosion protection, and acoustical damping without the high water uptake associated with PA6 and PA66 coating powders. The grade designation 1111 identifies a fine-particle natural-color powder within the broader VESTOSINT® PA12 range. In comparison with pigmented PA12 powders, the absence of carbon black, titanium dioxide, or organic colorants removes a source of triboelectric and melt-viscosity variation during electrostatic deposition. The grade is supplied as a dry powder, not as a compound, and is not interchangeable with injection-molding PA12 pellets. Published data for this specific configuration is limited for some particle-size and rheology parameters; when lot-specific values are required, the current Evonik certificate of analysis and safety data sheet are controlling.
Representative physical data for natural PA12 coating powders of this class, measured according to ISO 1183-1:2019, ISO 60, ISO 11357-3:2018, and ISO 307:2019, indicate a solid density near 1.01 g/cm3, a bulk density in the range 0.45–0.55 g/cm3 depending on aeration and compaction, and a crystalline melting endotherm near 176–180°C. Melt viscosity is controlled by molecular weight; coating grades typically show viscosity numbers around 130–150 cm³/g when dissolved in m-cresol or sulfuric acid according to ISO 307:2019. Melt volume-flow rate can be measured according to ISO 1133-1:2022 at 235°C with a 2.16 kg load; values for natural PA12 coating powders are typically in the range of 20–30 cm³/10 min. Particle size distribution is the primary grade-differentiation variable. Published values for similar fine PA12 coating powders give a median particle diameter d50 in the range 50–70µm and an upper particle size d90 below 100µm, as determined by laser diffraction according to ISO 13320:2020. Tensile properties of free films, when tested according to ASTM D638-14, generally show yield stress in the range 40–50 MPa and elongation at break above 200% for unfilled PA12. Shore D hardness typically falls between 70 and 78 when tested according to ISO 868:2003. These values are representative ranges from general PA12 coating-powder data and are not a substitute for a lot-specific certificate.
Colorants and fillers alter melt viscosity, recrystallization behavior, particle charging, and film smoothness. A natural PA12 powder avoids pigment-specific differences in triboelectric charging and dielectric loss, which supports more consistent transfer efficiency in corona electrostatic spray lines. In comparison with PA11 and PA6 powders, PA12 offers lower water absorption, lower density, and a narrower property shift under humid service conditions. According to ISO 62:2008, PA12 absorbs approximately 0.2% water at 23°C and 50% relative humidity, compared with roughly 2.5% for PA6 under the same exposure. At saturation in water, PA12 uptake is on the order of 0.7%, whereas PA6 can exceed 9%. This lower moisture uptake reduces hydrolysis and dimensional change in humid environments, but it does not eliminate the need for substrate corrosion protection. Filled grades, by contrast, may provide higher stiffness but produce rougher films, higher melt-viscosity build-up, and greater spray-gun wear. VESTOSINT® 1111 is designed without reinforcing fillers or internal release agents, and the natural color permits downstream tinting only if the additive system is compatible with the polyamide matrix. For outdoor applications, unpigmented PA12 is not inherently UV-stable; long-term exposure can cause embrittlement and discoloration. Where UV resistance is required, a pigmented or stabilized grade should be selected, or a topcoat should be used.
Within the Evonik VESTOSINT PA12 family, the 1111 designation is positioned as a general-purpose natural unpigmented coating powder. Other VESTOSINT grades may be formulated with pigments, mineral fillers, or optimized particle size distributions for specific film thickness ranges. The choice between a fine grade and a coarse grade affects bed expansion, powder consumption, and edge coverage. Finer powders allow smoother thin films, better penetration of small openings, and lower minimum film thickness; coarser powders reduce dusting and improve handling in high-volume fluidized bed lines. The absence of pigments in VESTOSINT 1111 means that batch-to-batch color consistency is controlled by the base polymer rather than pigment dispersion stability. This is an advantage where natural color is acceptable, but it also means that the powder cannot provide the UV screening associated with carbon black or titanium dioxide.
Fluidized-bed dipping of metal parts uses a preheated substrate to sinter the powder into a continuous film. Production-scale lines typically preheat steel or aluminum components to 250–320°C before immersion into an aerated powder bed. The part temperature and mass determine the deposit thickness; dip times of 2–8 s are common for thin-wall steel wire goods, with heavier sections requiring longer immersion. After dipping, residual heat fuses the powder into a coherent layer; parts may then be post-cured in a convection oven at 180–220°C for several minutes. Electrostatic spray application of VESTOSINT® 1111 can be performed with corona charging guns operating at 60–100 kV and powder feed rates of 50–200 g/min, depending on part geometry and required film thickness. The powder's particle size distribution is selected for adequate spray-cloud uniformity and film-build control. Overlarge particles reduce transfer efficiency and create a coarse surface, while fines below 10µm can produce dusting, spitting, and poor edge coverage.
In electrostatic spray lines, transfer efficiency is governed by particle charge-to-mass ratio, gun voltage, booth airflow, and powder resistivity. For natural PA12 powders, the absence of carbon black increases volume resistivity relative to black pigmented grades; this can improve faraday cage penetration but may also increase the risk of back-ionization. Booth relative humidity should be maintained between 30% and 50% to stabilize charging without causing powder clumping. Typical gun-to-part distance is 150–250 mm, and a maximum film thickness per pass of 80–120µm is often targeted before curing; thicker single-pass deposits can develop trapped air ports and solvent-free voids. Multiple passes may be used to build thicker films, but inter-pass adhesion depends on the first pass remaining sufficiently molten or tacky. In fluidized beds, bed aeration is adjusted to maintain a dense-phase expanded bed with a free surface resembling a boiling liquid. Uneven airflow produces channeling and areas of high powder velocity that deposit non-uniformly. The powder feed system should include sieve classification at the return line to remove oversize agglomerates that form after exposure to moisture or electrostatic charge.
Film defects arise when substrate temperature is too low to melt particles or too high causing yellowing and oxidation. At temperatures above 220°C, prolonged exposure can cause thermal degradation of PA12, evidenced by discoloration, melt-viscosity shift, and reduced film toughness. Use of a post-fusion oven above 230°C accelerates oxidation; hot spots and flame impingement must be avoided. Substrate pre-treatment is also critical: residual oils, mill scale, or loose phosphate conversion coatings reduce adhesion and can create interfacial corrosion paths. For ferrous substrates, a zinc phosphate or iron phosphate conversion layer is commonly specified to improve wet adhesion and corrosion creep resistance; for stainless steel and aluminum, mechanical abrasion or chemical etching may be required. The coating line should be operated with dry compressed air and with powder recovery cyclones and sieves to prevent accumulation of fines and foreign debris.
The final film structure depends on cooling rate through the recrystallization region between 150°C and 160°C. Slow cooling can produce greater spherulite growth and higher surface tack; rapid quenching in water or dry air reduces crystalline perfection and produces a tougher, more transparent layer. On production lines, this is controlled by conveyor speed, air-knife cooling, or water quench. Misalignment can lead to inter-particle void formation, pinholes, and poor edge coverage on stamped or welded wire goods. In industrial coating operations, batch-to-batch variance in particle size and moisture content has been reported to shift the minimum film-forming melt temperature by 3–5°C, requiring adjustment of preheat settings and powder-bed aeration. Published data for this specific configuration is limited; process conditions should be established on representative part geometries before full-scale production.
Thermal degradation of PA12 in air follows an oxidative pathway involving amide alkyl chain scission, discoloration, and eventual gel formation. Differential scanning calorimetry of degraded samples shows both melting-point depression and broadening of the crystallization exotherm. In practical coating lines, this is detected by an increase in purge time, a drop in film gloss, and a higher proportion of brown specks. The melt temperature should be monitored by infrared pyrometry on the part before dipping; a temperature deviation can alter film thickness on complex shapes and should trigger immediate correction of oven settings or line speed.
Table 1 summarizes representative property ranges and the corresponding test methods for natural PA12 coating powders of this type.
| Property | Test method | Representative range/value | Process relevance |
|---|---|---|---|
| Solid density | ISO 1183-1:2019 | 1.01 g/cm3 | Lower mass per unit film thickness than PA6/PA66 coating powders |
| Bulk density | ISO 60 | 0.45–0.55 g/cm3 | Controls bed expansion and electrostatic feed consistency |
| Melting endotherm | ISO 11357-3:2018 | 176–180°C | Sets substrate preheat requirements for fluidized-bed dipping |
| Recrystallization peak | ISO 11357-3:2018 | 150–160°C | Defines cooling-rate sensitivity and surface tack |
| Viscosity number | ISO 307:2019 | 130–150 cm³/g | Related to melt viscosity and powder coalescence |
| Melt volume-flow rate at 235°C/2.16 kg | ISO 1133-1:2022 | 20–30 cm³/10 min | Controls melt flow and film leveling |
| Median particle size d50 | ISO 13320:2020 | 50–70µm | Controls transfer efficiency and film thickness uniformity |
| Upper particle size d90 | ISO 13320:2020 | <100µm | Limits coarse particles and surface roughness |
| Water absorption at 23°C/50% RH | ISO 62:2008 | ≈0.2% | Lower moisture uptake than PA6/PA66 |
| Shore D hardness | ISO 868:2003 | 70–78 | Indicates hard, wear-resistant film surface |
The comparison data in Table 1 are drawn from general PA12 coating-powder literature and are not lot-specific specifications. Actual values for VESTOSINT® 1111 should be taken from the current technical data sheet and certificate of analysis from Evonik.
Storage should be in sealed containers at 20–30°C and below 60% relative humidity. Once exposed to high humidity, the powder may develop flow defects and reduced electrostatic chargeability. Drying in a dry-air oven at 80°C for 2–4 h can restore flow, but oxidative degradation at higher temperatures or longer residence times must be avoided. The powder is not compatible with strong mineral acids, formic acid, phenol, or strong oxidizing agents; these media can dissolve or degrade PA12. For parts in direct contact with aggressive solvents or process fluids, tests according to ISO 175:2010 or ASTM D543 should be performed under intended service conditions. Adhesion and corrosion performance should be verified on the actual substrate and pretreatment system, because the powder alone does not substitute for a correctly cleaned and phosphated surface.
For applications involving food-contact surfaces, grade-specific compliance with FDA 21 CFR 175.300, EU 10/2011, or other regional requirements must be confirmed with Evonik, because natural unpigmented powder does not automatically guarantee food-contact approval for all conditions of use.
Corrosion resistance of PA12-coated steel is commonly evaluated by neutral salt spray according to ASTM B117 or ISO 9227. Published data for VESTOSINT 1111 in this configuration is limited, so direct comparison with other coating powders should be performed on the same test rig and the same substrate pretreatment.
Dry-running wear resistance of fused PA12 films is commonly assessed by Taber abrasion according to ASTM D4060 using CS-17 wheels; the result is reported as weight loss per 1,000 cycles. Published data for VESTOSINT 1111 in this configuration is limited, so comparative wear screening should be conducted under the same load, wheel refacing, and surface-preparation conditions.
