| HS Code | 346091 |
| Product | Evonik VESTOSINT® 1161 white Polyamide 12 |
| Color | White |
| Density | 1.01 g/cm³ |
| Melting Point | 178 °C |
| Particle Size D50 | 50 µm |
| Bulk Density | 0.38 g/cm³ |
| Water Absorption 24h | 0.2 % |
| Tensile Strength | 40 MPa |
| Elongation At Break | 200 % |
| Shore Hardness | D70 |
| Impact Strength Charpy | No break |
| Abrasion Resistance | Excellent |
| Chemical Resistance | Good resistance to acids, alkalis, and solvents |
As an accredited Evonik VESTOSINT® 1161 white Polyamide 12 factory, we enforce strict quality protocols—every batch undergoes rigorous testing to ensure consistent efficacy and safety standards.
| Packing | Evonik VESTOSINT® 1161 white Polyamide 12 powder is supplied in sealed 25 kg multi-layer paper bags, protecting against moisture. |
| Container Loading (20′ FCL) | 20' FCL: Evonik VESTOSINT® 1161 white PA12 powder, packed in sealed bags on pallets, loaded securely for safe transport. |
| Shipping | Evonik VESTOSINT® 1161 white Polyamide 12 ships as non-hazardous powder in sealed bags or drums, protected from moisture. Keep dry, away from ignition sources, and store below 50°C. Standard freight is suitable; avoid excessive heat and crush damage during handling. |
| Storage | Store VESTOSINT® 1161 white Polyamide 12 in its original, tightly sealed container in a cool, dry, well-ventilated area. Protect from moisture, direct sunlight, heat, and ignition sources. Keep away from strong oxidizers. Avoid generating dust and static. Under proper conditions, shelf life is typically two years from delivery. |
| Shelf Life | Store in original sealed packaging, dry and cool. Shelf life is at least 2 years from production date. |
Coating of dishwasher basket wire goods with VESTOSINT® 1161 white is specified where the finished component must withstand alkaline dishwasher detergents, rinse-aid surfactant attack, wet abrasion from crockery contact, and mechanical deformation during basket loading. The material is applied as an unmixed powder at 100 wt% solids; no additional resin, hardener, or solvent is introduced. When electrostatic fluidisation is used, an external dry-flow agent such as fumed silica may be metered at 0.05–0.2 wt% to stabilise powder suspension, but addition above 0.3 wt% has been observed on production lines to reduce film impact toughness. The specified coating deposit for dishwasher baskets is typically 300–500 µm on primary wire surfaces, with local thickening at welded intersections sometimes exceeding 650 µm on dense-grid areas because of melt flow restriction during dipping. Compliance for this segment is commonly evaluated against DIN EN 12875-1:2006 for mechanical dishwashing resistance, DIN EN ISO 2178 for magnetic film thickness measurement, and ISO 9227 neutral salt spray when corrosion resistance of the underlying steel is part of the purchase specification. The downstream process consists of alkaline degreasing, iron phosphate conversion coating, forced-air drying, substrate preheat in a multi-zone convection oven at 280–340 °C, fluidised-bed immersion for 3–8 s, and post-fusion at 190–210 °C for 2–5 min. Production-scale failure modes include localised powder agglomeration when compressed air dew point is higher than -40 °C, and uneven cure when dense baskets exit the oven with internal wire packs below 175 °C. Finished terminal products are dishwasher baskets, cutlery baskets, wire racks, and internal washing-machine load supports.
Automotive seat adjuster rails and sliding elements coated with VESTOSINT® 1161 white are processed on electrostatic spray lines where low-friction movement, low noise generation, and corrosion resistance after stone impingement are the controlling requirements. In this segment the coating is not compounded with solid lubricants; the powder is sprayed as a 100 wt% solids formulation and the final sliding behaviour is generated by the semicrystalline PA 12 matrix rather than by a secondary lubrication layer. Dry-flow additive content is maintained between 0.1 wt% and 0.2 wt% in powder hoppers fitted with fluidising plates to prevent pulse-fed charge variation. Film build is held to 200–400 µm on sliding faces; values above 500 µm create interference in U-channel clearance and have been measured as a direct cause of increased adjustment effort during end-of-line actuation tests. Corrosion and adhesion requirements are verified by ISO 9227 neutral salt spray exposure and cross-cut adhesion tested according to ISO 2409:2020, with typical classification ≤1 after 480 h NSS. The production sequence uses Alkaline-cleaned mild steel or galvanised substrates, phosphate conversion treatment, preheat at 200–240 °C, electrostatic application with corona guns operating at 60–80 kV, and cure at 190–210 °C for 4–7 min. On actual high-volume lines, the dominant defect is Faraday cage penetration inside U-section rail channels, resulting in local film thickness below 80 µm at the radius bottom; manual touch-up or downstream remelting is required when the defect exceeds 15% of the slide path length. Finished terminal products include seat adjustment rails, fore-aft slider profiles, release handle brackets, and seat latch sliding shoes.
| Application method | Substrate preheat | Coating deposit range | Fusion or cure condition | Observed line limitation |
| Fluidised-bed dip | 280–340 °C | 300–800 µm | 190–210 °C, 2–5 min | Moisture-induced powder agglomeration above 60% RH; bed dew point must stay below -40 °C |
| Corona electrostatic spray | 180–240 °C | 150–400 µm | 190–210 °C, 4–7 min | Faraday cage in U-channel geometry lowers local thickness below 80 µm |
| Flame-spray deposition | 120–170 °C | 400–1000 µm | Post-heat 190–210 °C, 3–6 min | Oxidised powder residue when flame distance is below 150 mm; surface roughness Sa 2.5–3.0 µm required |
On food-contact conveyor guide rails and chain guides, the use of VESTOSINT® 1161 white begins with the premise that a no-primer single-layer polyamide 12 deposit removes the cut-edge corrosion pathway created when subsequent machining exposes bare steel through a two-coat epoxy system. The powder is applied at 100 wt% solids with no solvent carrier; formulation addition is confined to external dry-flow modification at 0.05–0.1 wt% where the fluidised-bed hopper shows pulsating powder feed. Target film thickness is 250–500 µm on food-contact guide surfaces, because thinner deposits on stainless or mild steel have been found on filling lines to lose impact resistance at welded tab connections during cleaning-in-place cycles. Compliance in this segment is governed by FDA 21 CFR 175.300 for resinous and polymeric coatings used in contact with food, and by EU Regulation 10/2011 where the finished component is placed on the European market; lot-specific migration documentation is required only after the final part geometry and cleaning protocol are fixed. The downstream production process for guide rails involves degreasing, grit blasting or phosphate treatment, preheat at 190–230 °C, electrostatic spray application at 50–70 kV, and oven fusion at 190–210 °C. A recurring production bottleneck is the cleaning of blind holes and chain-link pin recesses; phosphate drag-out into these cavities causes localised blistering after 200 h of detergent immersion. Finished terminal products are conveyor guide rails, chain guides, sorting paddles, bakery dough scraper brackets, and chain tensioner covers.
Mechanical engineering components such as valve handwheels, levers, torsion springs, and latch handles are coated with VESTOSINT® 1161 white when the specification requires a ductile polymer layer that does not shatter under impact at low ambient temperature. The formulation is used as supplied at 100 wt% solids; no pigment dispersion or co-resin addition is used, and the white coloration is intrinsic to the powder grade. In fluidised-bed lines, the powder may receive a dry-flow additive at 0.05–0.15 wt% to reduce rat-holing in the bed, but higher levels reduce inter-particle fusion at the deposit boundary. The standard coating thickness for this segment is 300–600 µm, with torsion spring coils frequently showing 150–200 µm local variation between the inner and outer coil surfaces because of geometric shielding during immersion. Corrosion acceptance is normally tested under ISO 9227 neutral salt spray; a common engineering requirement is no red rust after 720 h on shot-blasted steel. The production sequence includes degreasing, blast cleaning to Sa 2.5 according to ISO 8501-1, preheat in a convection oven at 260–320 °C, immersion in a fluidised PA 12 bed for 5–10 s, and post-fusion at 190–210 °C until the part surface reaches a uniform melt condition. One observed line failure is the loss of preheat on thin spring wire below 2 mm diameter during transfer from preheat oven to powder bed; this produces sand-like incomplete fusion at the coil apex and requires rework. Finished terminal product types are handwheel rims, lever arms, torsion springs, cam levers, and locking latch bodies.
Within laboratory and cleanroom equipment frames, VESTOSINT® 1161 white is selected primarily for low particle shedding, wipe-down chemical resistance, and the absence of a separate topcoat that could delaminate after repeated disinfection. The powder is used as a 100 wt% solids coating; no liquid carrier or crosslinking hardener is included, and the formulation addition ratio is limited to external dry-flow agents at 0.05–0.1 wt% when the powder feed system requires it. Coating thickness on instrument housings and frame connectors is controlled at 200–350 µm because heavier deposits on sharp corners create stress concentration and can crack during assembly. The applicable cleanroom compliance reference is ISO 14644-1:2015 for airborne particulate cleanliness, while coating adhesion after chemical exposure is checked by cross-cut adhesion testing under ISO 2409:2020. The downstream process is electrostatic spray application onto degreased and phosphate-treated steel or aluminium, with substrate preheat at 180–220 °C, corona charging at 50–70 kV, and fusion at 190–210 °C for 3–5 min. A characteristic field observation is that aluminium frames with mass above 8 kg may retain heat too long and create over-fusion if the line speed is unchanged from smaller parts; this results in yellowing at edges and a reduction in impact resistance. Finished terminal products include HPLC instrument housings, cleanroom pass-through frames, laboratory cart frames, and gas chromatography support stands.
Because office chair armrest supports, height-adjustment columns, and conference table bases are subjected to repeated cyclic loading and intermittent impact from briefcases and cleaning equipment, the PA 12 coating applied to their steel substructures must combine ductility with resistance to cosmetic scratch propagation. VESTOSINT® 1161 white is sprayed as a 100 wt% solids powder; the only addition permitted on line is a dry-flow agent at 0.05–0.1 wt% in the powder hopper to maintain constant cloud density. The target deposit is 200–350 µm, because thickness above 400 µm has been measured on chair height-adjustment tubes to reduce fit-up tolerance and cause scraping during telescoping movement. Adhesion after impact and scratch exposure is evaluated by ISO 2409:2020 cross-cut testing, while furniture-level mechanical durability references ANSI/BIFMA X5.1-2017 for office seating where the coating must not produce visible crack propagation during cyclic armrest loading. The production process uses zinc phosphate pretreatment, electrostatic spray at 50–65 kV, preheat at 190–220 °C, and fusion at 190–210 °C for 4–6 min. A common line defect is powder bridging inside the height-adjustment tube end; this requires reduced gun output at the tube mouth and lower conveyor speed for parts with closed-section geometry. Finished terminal products are armrest support brackets, height-adjustment columns, table base frames, and swivel chair spider bases.
| Downstream segment | Primary compliance reference | Typical film build | Critical process control point |
| Dishwasher baskets | DIN EN 12875-1:2006 | 300–500 µm | Preheat uniformity across welded wire intersections |
| Automotive seat rails | ISO 2409:2020, ISO 9227 | 200–400 µm | Faraday cage coverage inside U-channel profiles |
| Food-processing guide rails | FDA 21 CFR 175.300, EU 10/2011 | 250–500 µm | Residual phosphate drag-out in blind holes |
| Mechanical valve and spring parts | ISO 9227, ISO 8501-1 | 300–600 µm | Heat loss on thin wire during transfer to powder bed |
| Laboratory and cleanroom frames | ISO 14644-1:2015, ISO 2409:2020 | 200–350 µm | Thermal mass variation in aluminium frames |
| Office furniture structural parts | ANSI/BIFMA X5.1-2017 | 200–350 µm | Powder bridging at closed tube ends |
When pump housings, flange faces, valve bonnets, and pipe hangers are transferred from solvent-borne epoxy linings to VESTOSINT® 1161 white, the driving factors are frequently the elimination of volatile organic compound emissions during lining application and the need for a single-layer deposit that can tolerate hydrocarbon and hydraulic fluid contact without under-film corrosion. The PA 12 powder is applied at 100 wt% solids; no solvent or hardener is added, and the formulation addition ratio on production lines is limited to external dry-flow agent at 0.05–0.1 wt% where fluidised-bed behaviour is unstable. For pump housings and flanges, the specified deposit is 500–1000 µm; thinner deposits below 400 µm have been shown in service to expose sharp flange edges to early corrosion after gasket compression. Compliance is often referenced to ISO 9227 neutral salt spray for corrosion resistance, DIN EN ISO 2178 for thickness verification, and ISO 8501-1 for surface preparation. Two downstream processes are used: smaller pump housings and flanges are coated by fluidised-bed dip after preheat at 250–350 °C, while large pump bodies are coated by flame-spray deposition at 120–170 °C substrate preheat followed by post-fusion at 190–210 °C. For flame-spray work, surface roughness Sa 2.5–3.0 µm is required to achieve adhesion; smoother surfaces have produced local delamination during hydrostatic pressure cycling. A process boundary is the exposure of PA 12 to strong mineral acids and polar solvents at elevated temperature; continuous immersion in ketones or concentrated hydrochloric acid is not recommended because of swelling and premature loss of adhesion. Finished terminal products are pump housings, flange faces, valve bonnets, pipe hanger brackets, and expansion joint clamping rings.
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Evonik VESTOSINT® 1161 white is a polyamide 12 coating powder supplied as a dry, white-pigmented product for electrostatic spray, fluidized bed dip coating, and flame spray deposition on metal surfaces. The base polymer is a semicrystalline laurolactam-based PA 12 with a methylene-to-amide group ratio larger than that of PA 6 or PA 66; this chemical spacing gives lower equilibrium water absorption, reduced hydrolysis rate in wet service, and less low-temperature embrittlement from absorbed moisture. Data obtained under ISO 62:2008 show saturated water absorption for PA 12 at or below 1.5 %, whereas PA 6 typically exceeds 9 % under equivalent conditions. The product is not a molding compound; its powder particle size distribution and melt viscosity are adjusted for film coalescence rather than injection or extrusion. Within the VESTOSINT range, 1161 white is positioned as a white-pigmented electrostatic spray grade, differentiated from coarser fluidized-bed powders by a controlled top cut and from black or natural grades by titanium dioxide pigmentation that affects charge dissipation and oven radiant absorption. The grade name specifies the polymer type, color, and particle size generation, and certificate-of-analysis values are lot-specific.
| Property | Test method | Reported range or typical value |
|---|---|---|
| Polymer base | — | Polyamide 12 |
| Density of fused film | ISO 1183-1:2019 | 1.01–1.03 g/cm³ |
| Melting range, DSC | ISO 11357-3:2018 | 176–180 °C |
| Water absorption at saturation | ISO 62:2008 | ≤ 1.5 % |
| Particle size D50 | ISO 13320:2020 | 50–70 µm nominal |
The amide group spacing in PA 12 produces a lower concentration of hydrogen-bonding sites than short-chain polyamides, which reduces the driving force for water sorption and limits the plasticizing effect of dissolved water on the glass transition. Differential scanning calorimetry per ISO 11357-3:2018 places the melting range of VESTOSINT 1161 white at approximately 176–180 °C; the relatively sharp melting endotherm supports rapid film coalescence once the metal substrate reaches the required peak metal temperature. In service, the lower water uptake of PA 12 translates into more stable dielectric response and dimensional response than PA 6 or PA 66 coatings in humid environments. Impact retention at subzero temperatures is governed by the long methylene sequences that remain mobile below 0 °C; the glass transition of PA 12 is below -40 °C, which supports impact retention in cold service. Comparative impact testing should follow ISO 6603-1:2000 on production-representative panels. Chemical resistance of fused films to alkaline cleaning agents, salt spray, and aliphatic hydrocarbons is used in dishwasher baskets, automotive wire goods, and conveyor components. Screening for chemical exposure can follow ISO 175:2010 with production-relevant immersion fluids, while salt spray exposure can be evaluated by ISO 9227:2017. The powder is not inherently conductive, and dry-film electrical properties are a function of moisture content and pigment dispersion; conductivity measurements on the fused film require a specific test configuration because coating thickness and substrate type affect the measured surface resistance.
Electrostatic transfer efficiency with VESTOSINT 1161 white is controlled by particle size distribution, particle shape, surface moisture, and the charge-to-mass ratio produced by the corona gun. Laser diffraction per ISO 13320:2020 is used for lot release; D50 alone is insufficient because the D90 and top cut determine film smoothness and the ability to penetrate recessed weldments. For electrostatic spray, the powder should be stored and conditioned at 20–25 °C and relative humidity below 60 %. Free moisture on the particle surface reduces charge acceptance and produces spits or gun blockage; pre-drying at 80 °C for 4 h is a common corrective action when the powder has been exposed to ambient humidity. Reclaimed powder sieved through a 125 µm screen can be blended with virgin product at a maximum ratio of 30 % to avoid accumulation of fines and pigment segregation. Particle size shifts in reclaim are a process conflict on high-volume lines: the finer fraction carries less charge per particle and may build up in electrostatic filters, while the coarser fraction deposits preferentially in flat zones, leaving edges thin. A low-velocity fluidized bed hopper with dry compressed air at a dew point below -40 °C is required for stable delivery to the spray gun.
Application of VESTOSINT 1161 white by corona electrostatic spray typically operates at gun voltage settings between 60 kV and 100 kV, with direct current output in the range of 10–100 µA. The substrate is preheated before powder deposition to achieve a peak metal temperature high enough to initiate melting and flow. For thin-section steel parts, preheat oven set points from 220 °C to 300 °C are common; the lower end is selected for low thermal mass components, and the upper end for castings or thick sections where the powder must remain molten long enough to wet the surface. After application, the part is held in a convection oven until the entire cross-section reaches the fusion range; optical pyrometry or contact thermocouples on a representative part are used to validate the cure profile. Peak metal temperature control within ±5 °C is recommended because under-cure below the lower melting boundary produces discontinuous films with poor adhesion, while overbake above 220 °C can cause oxidative yellowing of the white pigment and chain scission at the film-air interface. Film thickness for electrostatic spray is normally controlled between 200 µm and 400 µm; thickness below 150 µm may be insufficient for corrosion protection on rough welds, while thickness above 500 µm can develop internal stress and sag on vertical surfaces. In fluidized bed dip coating, the powder is fluidized with dry compressed air at 0.1–0.5 bar; preheated parts are immersed for 2–10 s, withdrawn, and post-cured to complete coalescence. Faraday cage areas on complex geometries require auxiliary air movement or reduced gun voltage because charged particles follow the shortest lines of force and may not penetrate recesses.
White PA 12 films produced from VESTOSINT 1161 are used on dishwasher baskets, refrigerator wire shelves, automotive fluid reservoir brackets, medical equipment rails, and outdoor furniture when a balance of corrosion resistance, low-temperature impact, and light color is required. In dishwasher basket service, the fused coating is exposed to alkaline detergents at temperatures up to 70 °C and must maintain adhesion over repeated thermal cycles; adhesion can be evaluated by cross-cut testing per ISO 2409:2013 after cyclic exposure. For automotive clips, the low coefficient of friction and abrasion resistance of PA 12 reduce noise in interior assemblies. Coefficient of friction can be measured by ISO 8295:1995, and abrasive wear can be screened by ISO 9352:2012. Published data for specific food-contact compliance of this grade under migration testing should be obtained from the current manufacturer declaration, because migration limits depend on coating thickness, substrate, and end-use simulant. For white exterior components, UV exposure causes surface chalking, and a clear acrylic or polyurethane topcoat may be required if gloss retention is critical; without a topcoat, the PA 12 film remains protective but aesthetic gloss degrades faster than aliphatic polyurethane systems. Gloss measurements can be performed at 60° geometry according to ISO 2813:2014, but the powder is not supplied as a low-gloss or textured finish unless post-milling additives are specified.
Replacing a solventborne coating with VESTOSINT 1161 white eliminates volatile organic compound emissions from the application oven and removes the flash-off step; only oven air movement and particulate filtration remain as process emission controls. The coating is a thermoplastic, not a crosslinked thermoset. In comparison with epoxy powder, the PA 12 film has lower pencil hardness, generally in the range of HB–2H when measured by ASTM D3363-22, but offers better impact resistance and less brittleness at low temperature. Epoxy powder can withstand higher continuous dry heat and has better adhesion to untreated steel, while PA 12 requires mechanical roughening or phosphate pretreatment for maximum adhesion and provides better resistance to alkaline cleaning solutions and salt spray. In comparison with polyethylene powder, PA 12 displays superior adhesion to primed steel, higher tensile strength, and better resistance to hot detergent solutions, but is more expensive per kilogram. Compared with PA 11, PA 12 has a slightly lower density and melting point; field performance differences are often hidden by particle size distribution and substrate preparation effects. When replacing another polyamide powder within the VESTOSINT range, the defining variable is the particle-size distribution. A coarser fluidized-bed grade may produce a smoother thick film in dip coating, while 1161 white is selected for electrostatic spray and thinner films on complex shapes. Published data for direct comparative adhesion of VESTOSINT 1161 white to solventborne primer systems is limited; compatibility testing on production-representative parts is required before line conversion.
Storage of VESTOSINT 1161 white should be conducted in sealed containers at 20–25 °C and relative humidity below 60 %. The powder has a low equilibrium moisture content, but opened containers left in humid plants will develop surface moisture that depresses charge-to-mass ratio and causes impact fusion in the recovery cyclone. Drying a moist powder requires low-temperature forced air, not direct radiant heat; temperatures above 60 °C for prolonged periods risk sintering the finer fraction and shifting the D50. Reclaim handling is the main source of batch-to-batch variation on production lines. Overspray collected from booth filters and cyclone separators contains a higher proportion of fines and may also contain metallic wear debris from the coating line. If reclaim is re-introduced without sieving, the particle size distribution shifts toward smaller diameters, reducing fluidization, increasing surface area, and changing film build. A vibrating sieve at 125 µm removes agglomerates and foreign particles; the retained fraction is discarded. Blending reclaimed powder at a maximum of 30 % with virgin product is common practice, but the exact ratio should be confirmed by a charge-decay measurement because reclaimed material may carry residual moisture and altered dielectric properties. Overbake oxidative yellowing is a critical limit for a white product. Once the fused film exceeds 220 °C for extended dwell, the amide groups and titanium dioxide interface can participate in thermal oxidation pathways that shift the color from white to cream. Process audits should record peak metal temperature, oven dwell, line speed, and reclaim ratio for every batch; failure to maintain these variables within the validated window is the primary cause of field adhesion loss and color drift.
On a high-volume dishwasher basket coating line, VESTOSINT 1161 white is typically applied after degreasing and shot blasting; the parts are preheated in a gas-fired convection oven to a peak metal temperature near 250 °C, coated by automated reciprocating corona guns in a booth with 60–90 kV charging, and then post-cured for 10–15 min at a part-temperature set point validated by thermocouple. The line must balance film thickness at weld intersections against Faraday cage voids; reducing gun voltage to 70 kV and increasing reciprocation speed improves penetration but lowers first-pass transfer efficiency. Powder that does not deposit is recovered, sieved through a 125 µm screen, and blended with virgin powder at a ratio not exceeding 30 %. Coating thickness is checked at defined measurement points with a magnetic induction gauge per ISO 2360:2017; if thickness at wire intersections falls below 180 µm, the preheat set point is raised by 5 °C before adjusting the powder cloud. Published data for this specific configuration is limited, so start-up trials on production-representative baskets are required to establish the optimal gun-to-target distance, booth airflow, and reclaim ratio.
