UV Adhesives / UV Curing Equipments / UV LED Equipments / UV LED Spot Equipments

Incure Litemask™ 8188G: A High-Temperature Peelable Maskant for PCB Assembly

Board assembly puts a lot of surfaces close together that need different treatment: pads to be soldered, contacts to stay bare, features to stay clean. Incure Litemask™ 8188G is a high-temperature, light-curable peelable gel maskant for protecting the ones that must not see solder or process contamination. Selective protection on a populated board On a printed circuit board headed through wave soldering or selective soldering, the maskant defines where solder is allowed and where it is not. It covers gold fingers, edge connectors, press-fit sockets, test points, and mechanical hardware, then peels away after the thermal process without leaving anything behind. 8188G is formulated as a tough-yet-soft film. It withstands the temperatures of wave soldering while keeping enough elongation to be removed in one clean piece, rather than embrittling and breaking into fragments that wedge between leads and pads. What it protects against The cured film shields surfaces from chemical stains, burnt marks, and other contamination generated during soldering. The formulation is 100% solids with no volatile organic compounds and no acids. On electronic assemblies, the absence of ionic residue is critical: trapped ionic species can drive corrosion and electrochemical migration in service. Typical protected features are PCBs, populated components and sub-assemblies, and any board-level connector or contact that has to stay solderable and clean for a later operation. Cure options and control 8188G cures under UV, visible, or LED light. The reaction is radical photopolymerization driven by energy near 365–405 nm. Repeatability depends on the delivered dose, measured in millijoules per square centimeter with a radiometer, and on exposure of every masked surface, including the shadowed side of tall components. Gel films built thick, or masked regions in a lamp shadow, are where cure lags. A skinned-over surface with a soft underlayer leaves residue on peel. Adequate dose plus a fixture that presents all masked faces to the light keeps the full film solid. Because UV output declines with source age, intensity should be verified on a schedule. Batch trays cure under Incure L-Series UV LED flood lamps, and enclosed work fits an Incure B/C-Series UV cure chamber. Application and removal 8188G is applied by brush or dispense and shaped to the masked boundary. Its gel body holds position around component outlines and on vertical features without running. After soldering, the film peels by hand; the target is a single clean motion with no fragments left in fine-pitch areas. Because it replaces the slow work of cutting and burnishing high-temperature tape around connectors and dense features, the gel reduces the labor content of solder masking. For help matching Litemask™ 8188G to a specific soldering profile and peak temperature, Email Us with the process details and the features being protected. Failure modes Charring at the mask line means the film exceeded its temperature limit or dwelled too long in the heat; set the boundary back from the hottest zone. Fragmenting on removal indicates excess thermal history, so removal timing is part of the process spec. Tacky residue is a cure…

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August 23, 2024
UV Adhesives / UV Curing Equipments / UV LED Equipments / UV LED Spot Equipments

Incure Litemask™ 8114VT: A High-Temperature UV-Curable Masking Resin

Processes that heat a part, from wave soldering to bake cycles, need a maskant that does not soften, char, or bleed at the boundary. Incure Litemask™ 8114VT is a high-temperature, UV-curable masking resin with a thixotropic body that stays where it is applied and peels off clean. Controlled placement at high temperature The VT designation points to a very thixotropic rheology: the resin resists flow at rest, so it holds a defined edge on vertical walls and around standing features without sagging, then thins under the shear of a brush or dispense tip. That combination matters for high-temperature masking, where a wandering or feathered edge tends to be the first place the film breaks down under heat. 8114VT forms a tough-yet-soft peelable film. It withstands elevated temperature during processing while retaining enough elongation to be removed in one piece rather than shattering into fragments. What it protects The cured film guards surfaces against chemical stains, burnt marks, and other contamination from soldering and thermal processing. It is also used for product surface protection, shielding finished parts from scratches, stains, and handling damage during shipping and storage. The resin is 100% solids with no volatile organic compounds and no acids. On cleanliness-sensitive electronic hardware, that absence of ionic residue is a requirement, not a nicety, because trapped ionic species can drive corrosion and electrochemical migration downstream. Cure options and control 8114VT cures under UV, visible, or LED light. The reaction is radical photopolymerization driven by energy near 365–405 nm. A repeatable cure needs the delivered dose measured in millijoules per square centimeter with a radiometer, plus exposure of every masked surface, including shadowed faces behind tall components. Thick sections and shadowed pockets are where cure lags. If the surface skins before the bulk sets, the underlayer stays soft and leaves residue on peel. Enough dose and a fixture that presents all masked faces to the lamp keep the full film solid. Because lamp and LED output falls with age, intensity should be verified on a schedule rather than assumed. Batch trays cure under Incure L-Series UV LED flood lamps, higher-output arc coverage comes from Incure F-Series UV flood lamps, and inline curing runs on an Incure CDM UV conveyor. Application and removal 8114VT is brushed or dispensed and shaped to the masked boundary. Its thixotropic body builds film on vertical and overhead surfaces and holds a crisp edge. After processing, the film peels by hand in a single motion, ideally without leaving fragments in tight features. Because it replaces the labor of fitting high-temperature tape around connectors and irregular features, the resin cuts the time and cost of the masking step. For help matching Litemask™ 8114VT to a specific thermal profile and peak temperature, Email Us with the process details and the surfaces being protected. Failure modes Breakdown at the mask line means the film was exposed above its temperature limit or held in the heat too long; set the boundary back from the hottest zone. Fragmenting on removal indicates excess…

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August 23, 2024
UV Adhesives / UV Curing Equipments / UV LED Equipments / UV LED Spot Equipments

Incure Litemask™ 8177G: A High-Temperature Light-Curable Peelable Maskant

Wave soldering and reflow expose a board and its neighbors to temperatures that break down an ordinary maskant at the mask edge. Incure Litemask™ 8177G is a high-temperature, light-curable peelable gel maskant built to hold its boundary through soldering heat and peel away without residue. The high-temperature masking problem A peelable maskant used near soldering has two jobs at once. It has to survive the thermal exposure of the process, and it has to come off cleanly afterward. Many masking materials do one or the other. A film that resists heat well often embrittles and shatters on removal; a film that peels easily often softens or chars at the mask line during soldering. 8177G is formulated as a tough-yet-soft film. It withstands the temperatures of wave soldering while retaining enough elongation to peel off in one piece rather than fragmenting into slivers that lodge between leads and pads. What it protects against The cured film shields surfaces from chemical stains, burnt marks, and other contamination generated during soldering and related processing. Typical use is masking gold fingers, press-fit connectors, test points, and mechanical features on a board or assembly that must stay solder-free and clean. The formulation is 100% solids with no volatile organic compounds and no acids, which matters on cleanliness-sensitive electronic hardware where residual ionic species could drive corrosion or electrochemical migration later. Cure options and control 8177G cures under UV, visible, or LED light. The reaction is a radical photopolymerization driven by energy near 365–405 nm. A repeatable cure depends on the delivered dose, measured in millijoules per square centimeter with a radiometer, and on exposure of every masked surface, including the shadowed side of tall components. Gel films built up thick, or masked areas sitting in a lamp shadow, are where cure lags. If the surface skins before the bulk sets, the underlayer stays soft and can leave residue on removal. Adequate dose and a fixture that presents all masked faces to the light keep the full film solid. Because UV output declines as sources age, intensity should be verified on a schedule. Batch trays cure under Incure L-Series UV LED flood lamps, and enclosed work fits an Incure B/C-Series UV cure chamber. Application and removal 8177G is applied by brush or dispense and shaped to the masked boundary. Its gel body holds position on vertical features and around component outlines without running. After processing, the film peels by hand; the goal is a single clean motion with no fragments left in tight spaces. Because it removes the slow work of fitting and burnishing high-temperature tape around connectors and fine-pitch features, the gel reduces the labor content of solder masking. For help matching Litemask™ 8177G to a specific soldering profile and peak temperature, Email Us with the process details and the surfaces being protected. Failure modes Charring or breakdown at the mask line means the film was exposed above its limit or held in the heat too long; set the masked boundary back from the highest-temperature…

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August 23, 2024
UV Adhesives / UV Curing Equipments / UV LED Equipments / UV LED Spot Equipments

Incure Litemask™ 4139G: A Light-Curable Gel Peelable Maskant

Some masking work needs a material that stays exactly where the operator puts it, with a defined edge and no migration into areas that must stay exposed. Incure Litemask™ 4139G is a light-curable gel peelable maskant formulated for controlled placement and clean removal on plating and cleaning lines. Gel versus liquid maskants A liquid maskant flows, self-levels, and finds its own edge. A gel maskant holds a shape. With 4139G, the operator sets the boundary and the material stays there: no run-off on vertical surfaces, no creep past the intended line, no pooling in low spots. That control is valuable when the masked and exposed regions sit close together and a feathered or wandering edge would spoil the result. The gel is applied by brush or dispense, cured in place into a tough elastomeric film, and peeled off by hand with no adhesive residue left behind. Cure options and control 4139G cures under UV, visible, LED, or heat. The reaction is radical photopolymerization driven by energy near 365–405 nm. Repeatability comes from two measured quantities: the delivered dose in millijoules per square centimeter, checked with a radiometer, and exposure of every masked face to that dose. A gel film built up thick, or one sitting in the shadow of a standing feature, is where cure lags. If the surface skins before the bulk sets, the layer underneath stays soft and chemicals attack it during the bath. Enough dose plus a heat step for shadowed areas keeps the full film solid. Because UV sources lose output with age, intensity should be verified on a schedule. Batch trays cure under Incure L-Series UV LED flood lamps, and enclosed work fits an Incure B/C-Series UV cure chamber. Chemical resistance and surface neutrality The cured film resists a wide range of chemicals, protecting masked surfaces through plating and cleaning cycles. The formulation is non-affective, so it does not stain, etch, or alter the masked surface before or after cure, and it lifts cleanly. It is 100% solids with no volatile organic compounds, giving low cure shrinkage and no solvent flash. Application and film build 4139G is placed by brush or dispensed bead and shaped to the boundary. Its gel body builds film on vertical and overhead surfaces where a thin resin would drain away. A second application adds barrier for longer or harsher baths. A wet-film gauge keeps thickness consistent across operators. Because it replaces the slow work of cutting and burnishing tape into radii and pockets, 4139G reduces the labor content of masking on plating and coating prep lines. For guidance matching Litemask™ 4139G to a specific bath chemistry, temperature, and dwell time, Email Us with those parameters and the substrate. Failure modes Tacky residue after peel is a cure problem: add dose, add a heat step, and confirm the gel was not built too thick for the light to penetrate. Tearing on removal that leaves gel in a recess means the film was too thin for that feature. Bleed-under of bath solution…

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August 23, 2024
UV Adhesives / UV Curing Equipments / UV LED Equipments / UV LED Spot Equipments

Incure Litemask™ 4139: A High-Viscosity UV Peelable Masking Solution

When a masking job involves vertical walls, sharp edges, and a bath that runs long, a thin resin runs off before it can protect anything. Incure Litemask™ 4139 is a high-viscosity, light-curable peelable maskant built to stay where it is placed and hold a thick barrier. Where high viscosity helps Viscosity controls two things in a maskant: how far it flows after application and how much film it builds in one pass. A high-viscosity grade like 4139 does not sag on a vertical surface, does not drain off a knife-edge, and lays down a substantial film in a single coat. That is what a demanding chemical cleaning or plating cycle needs, where the barrier has to survive extended immersion and agitation. The trade-off is that a thick, viscous film needs deliberate cure management, because light has to drive the reaction through the full depth of the layer. Cure paths and dose control 4139 cures under UV, visible, LED, or heat. The primary reaction is radical photopolymerization driven by energy near 365–405 nm. A repeatable process requires the delivered dose measured in millijoules per square centimeter with a radiometer, and confirmation that recessed and shadowed masked surfaces receive that energy. Thick films are the classic under-cure risk. If the surface skins over before the bulk cures, the layer beneath stays soft and chemicals attack it from within during the bath. Adequate dose, and a heat step for shadowed regions, keep the full thickness solid. Because lamp output drops with age, intensity should be verified on a schedule; a fixed belt speed under a monitored lamp holds the recipe. An Incure CDM UV conveyor pairs a lamp head with a known speed, and Incure L-Series UV LED flood lamps cover batch trays at a measured intensity. Chemical resistance and surface neutrality The cured film resists a wide range of chemicals, giving reliable protection through plating and cleaning baths. The resin is formulated to be non-affective, meaning it does not stain, etch, or change the masked surface before or after cure. It is 100% solids with no volatile organic compounds, so cure shrinkage is low and there is no solvent to flash off. Application Despite the high viscosity, 4139 is workable by brush, dispense, or flow-coat. It builds film fast on vertical and overhead surfaces where a thin resin would fail. For very long or aggressive baths, a second coat adds margin. A wet-film gauge keeps thickness consistent between operators and shifts. Because it cuts the hand labor of fitting tape into complex geometry, 4139 improves throughput on plating and coating prep lines while reducing the labor content of masking. Failure modes Under-cure in the film bulk is the main risk with a thick maskant; the fix is more dose and a heat cycle for shadowed areas. Bleed-under of bath solution beneath the mask edge is prevented by a clean, oil-free substrate and a cured edge bead set back from the boundary. Mask lift in a hot agitated bath means the adhesion is…

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August 23, 2024
UV Adhesives / UV Curing Equipments / UV LED Equipments / UV LED Spot Equipments

Incure Litemask™ 1123G: A Peelable Gel Maskant for Soldering and Blast Protection

Soldering, sandblasting, and solvent cleaning all put localized stress on a part, and the surfaces next to the work zone need protection that stays put and then peels away clean. Incure Litemask™ 1123G is a light-curable peelable gel maskant designed for exactly that kind of temporary, high-contrast protection. Why a gel form A gel maskant behaves differently from a thin resin. It holds its shape on a vertical wall, does not run off an edge, and forms a defined boundary where it is placed. That makes 1123G suited to spot masking: covering a connector next to a soldering operation, protecting a machined face during grit blasting, or shielding an area from solvent splash without coating the whole part. The gel is applied by brush or dispense, cured in place, and removed by hand. It carries no adhesive, so there is no residue to clean off the protected surface afterward. Cure options 1123G cures under UV, visible, or LED light. The reaction is a radical photopolymerization driven by energy near 365–405 nm. A repeatable result depends on the delivered dose, measured in millijoules per square centimeter with a radiometer, and on every masked surface seeing that light. Shadowed regions behind standing features cure slowly and may need repositioning under the lamp or a supplemental pass. Because UV output falls as sources age, intensity should be verified rather than assumed. Batch work cures under Incure L-Series UV LED flood lamps at a set distance, and enclosed curing fits an Incure B/C-Series UV cure chamber. Protection during soldering, blasting, and cleaning The cured film resists the conditions of soldering processes, sand-blasting media, and a range of chemicals and solvents. For soldering, the film has to tolerate localized heat at the work zone without breaking down at the mask edge. For blasting, it has to absorb media impact rather than chip away. The gel's toughness and elongation give it the give it needs for both. That same elongation and toughness provide passive vibration isolation, which is why 1123G is also used where a protective layer needs to damp shock and vibration on a component during handling or transport. Removal 1123G is removed by soaking the masked component in hot water for about a minute, which relaxes the film so it peels away in one piece without breakage. Clean removal is a design goal of the grade: the film should not split into fragments that lodge in tight features or leave a skin behind on the protected surface. The maskant is also usable as a bonder for various substrates when a compliant, peelable-strength joint is wanted rather than a permanent structural bond. For help matching Litemask™ 1123G to a soldering profile, blast setup, or cleaning chemistry, Email Us with the process details and the substrate. Failure modes Tacky residue after removal is a cure symptom: add dose or reposition the part so shadowed areas get light. Tearing on peel that leaves gel in a recess usually means the film was applied too thin for the…

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August 23, 2024
UV Adhesives / UV Curing Equipments / UV LED Equipments / UV LED Spot Equipments

Incure Litemask™ 3148: A Residue-Free Peelable Maskant for Electronics and Optics

In electronics and precision optics, the masking material can do as much harm as the process it protects against. An ionic residue left behind after peel, or a film that scratches a polished face, turns a masking step into a contamination source. Incure Litemask™ 3148 is a UV-curable peelable maskant built around clean removal. The cleanliness requirement A maskant used on a printed circuit board, an optical window, or a sensor face has to leave the protected surface exactly as it found it. That means no adhesive transfer, no ionic species that could drive electrochemical migration later, and no mechanical marking of soft or coated surfaces during application or removal. Litemask™ 3148 is formulated as an ultra-clean, peelable film. It is designed to lift off in one piece without leaving residue or contamination, so the masked surface passes cleanliness inspection without an added cleaning step. Thickness range and why it matters 3148 can be applied from roughly 30 micrometers up to about 3,000 micrometers. That range covers two very different jobs. A thin film protects a flat optical or plated surface against handling marks and light chemical exposure. A thick film fills around standing components and bridges gaps, giving a robust barrier during more aggressive steps such as blasting or chemical treatment. Building thickness is done in passes, with a wet-film gauge to keep it consistent. Thicker sections need attention at cure, because light has to drive the reaction through the full depth. Cure behavior and control The maskant cures rapidly under UV light. The reaction is a radical photopolymerization driven by energy near 365–405 nm, and the two variables that decide repeatability are the delivered dose in millijoules per square centimeter, verified with a radiometer, and exposure of every masked surface, including the shadowed side of tall components. Thick films and shadowed pockets are where cure problems concentrate. Enough dose, and a fixture that presents all masked faces to the lamp, keep the film from staying tacky underneath. Because lamp and LED output declines with age, intensity should be checked on a schedule rather than assumed. Batch trays cure under Incure L-Series UV LED flood lamps, and enclosed work fits an Incure B/C-Series UV cure chamber. Chemical and thermal resistance The cured film protects surfaces from chemical stains and from scratch marks during handling, and it withstands elevated temperature, which lets it stay in place through processes that warm the part. The formulation is 100% solids with no volatile organic compounds, so there is no solvent flash and low cure shrinkage. For coated optics and sensitive electronic finishes, the combination of clean peel and chemical protection is the point: the film guards against process exposure without becoming a defect itself. Application and removal 3148 is brushed, dipped, dispensed, or flow-coated depending on part size and geometry. It conforms to component outlines and board features and cures into a coherent film that peels by hand. Removal is a single motion; the film should come away without splitting into slivers or…

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August 23, 2024
UV Adhesives / UV Curing Equipments / UV LED Equipments / UV LED Spot Equipments

Incure Litemask™ 4153: A UV Light-Curable Masking Resin for Chemical Cleaning

Chemical cleaning strips oxides, scale, and old coatings from a part, but it does not distinguish between the areas you want cleaned and the ones you need protected. Incure Litemask™ 4153 is a low-viscosity, light-curable masking resin built to give temporary protection through those cleaning steps. Why a thin masking resin Some masking jobs need a heavy, standing film. Others need the opposite: a resin thin enough to flow into fine detail, wet out a knife-edge, and coat the wall of a small bore without pooling. Litemask™ 4153 is formulated on the low-viscosity end so it penetrates tight geometry and forms a uniform film rather than a thick, uneven bead. That makes it a fit for maintenance and overhaul work where components go through immersion cleaning, descaling, or chemical stripping and a defined set of surfaces, such as bearing bores, sealing lands, and machined datums, must come out untouched. Curing options and control Litemask™ 4153 cures under UV, visible, LED, or heat, which lets it fit different shop setups without a dedicated line. The core reaction is radical photopolymerization driven by energy in the 365–405 nm range. Two things decide whether the cure is repeatable: the delivered dose, measured in millijoules per square centimeter with a radiometer, and line-of-sight exposure of every masked surface. Thin films cure through their depth quickly, which is one advantage of a low-viscosity resin, but shadowed faces still lag. A short heat cycle finishes those regions. Because UV sources lose output as they age, a fixed exposure recipe drifts unless intensity is tracked; a controlled belt speed under a fixed lamp keeps it honest. An Incure CDM UV conveyor pairs a lamp head with a known speed, and Incure L-Series UV LED flood lamps cover batch trays at a measured intensity. Chemical resistance and surface neutrality The cured film resists a broad range of cleaning chemistries, so masked surfaces stay protected through the bath. Just as important, the resin is formulated to be non-affective: it does not stain, etch, or alter the masked surface before or after cure, and it lifts off cleanly. That matters on finished or close-tolerance surfaces where a masking mark is itself a defect. The resin is 100% solids with no volatile organic compounds, so cure shrinkage is low and there is no solvent flash to manage. Application A low-viscosity resin can be brushed, dipped, flow-coated, or dispensed. It self-levels into a thin, even layer and creeps into threads and blind features. Where a longer or harsher cleaning cycle calls for more barrier, a second coat builds film without losing the ability to reach fine detail. A wet-film gauge helps operators hold thickness consistent. Because it streamlines protection during plating and coating prep, 4153 reduces the labor content of masking compared with cutting and burnishing tape into complex features by hand. Failure modes to watch Bleed-under, where cleaning solution wicks beneath the mask edge, is the main risk on any masked part. A clean, oil-free surface removes the capillary path, and…

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August 23, 2024
UV Adhesives / UV Curing Equipments / UV LED Equipments / UV LED Spot Equipments

Incure Litemask™ 4272: A Peelable Masking Solution for Plating and Acid Lines

Selective plating and chemical processing depend on one thing working reliably: a mask that keeps solution off the areas it does not belong and then comes off without a trace. Incure Litemask™ 4272 is a light-curable peelable maskant formulated for etch, strip, and electroplating baths. The problem selective plating creates Few parts are plated all over. Bearing journals get hard chrome while the rest of the shaft stays bare. Connector contact zones get gold while the body does not. Chemical milling removes metal from a defined window and nowhere else. Every one of these operations needs a boundary that survives immersion, agitation, current flow, and rinse cycles without lifting. Tapes and machined boots handle simple cylindrical or flat features. They fall short on splines, radii, cross-drilled holes, and the irregular pockets of a casting. Litemask™ 4272 is applied as a liquid, cured into a tough elastomeric film, and peeled off in one piece, leaving no adhesive to clean and no masking marks on the finish. Chemical resistance in practice Litemask™ 4272 withstands chemical etching and acid stripping, including the acidic baths common to chrome and nickel plating and the caustic solutions used to strip failed coatings. The formulation is 100% solids with no volatile organic compounds, so it does not shrink significantly on cure and does not outgas into the shop. Chemical resistance is not only a property of the polymer; it is a property of the applied film. An under-cured layer beneath a thick section behaves like a weaker material and lets solution attack from within. Adequate film build and a verified cure keep the barrier intact for the full bath residence time. Cure paths and dose control The maskant cures under UV, visible, or LED light, with heat and activator options for shadowed regions. The reaction is a radical photopolymerization driven by energy near 365–405 nm. A production process needs two things measured: the delivered dose in millijoules per square centimeter, checked with a radiometer, and confirmation that recessed faces and the back sides of features actually receive light. Because lamp output falls as sources age, a fixed recipe drifts unless intensity is monitored. Batch trays cure under Incure L-Series UV LED flood lamps at a set working distance, and higher-output arc coverage is available from Incure F-Series UV flood lamps. Enclosed batch work fits an Incure B/C-Series UV cure chamber. Application and film build A moderate viscosity lets 4272 be brushed, flow-coated, dipped, or robotically dispensed. It penetrates threads and narrow gaps while still building enough thickness on vertical walls to form a continuous barrier. Multiple coats increase film build where a long or aggressive bath demands it. A wet-film gauge during application is the simplest way to hold thickness consistent between operators. Typical work includes masking shaft journals for hard chrome, masking terminal bodies for selective gold or silver, protecting datum and sealing surfaces during chemical milling, and shielding threaded features during passivation. Failure modes and how to prevent them Bleed-under is the dominant plating defect:…

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August 23, 2024
Read more about the article Incure Litemask™ 4201: A Multi-Cure Peelable Maskant for Thermal Spray and Plating
UV Adhesives / UV Curing Equipments / UV LED Equipments / UV LED Spot Equipments

Incure Litemask™ 4201: A Multi-Cure Peelable Maskant for Thermal Spray and Plating

Thermal spray, hard chrome plating, and chemical etch lines share one recurring problem: keeping the coating off the surfaces that must stay bare. Incure Litemask™ 4201 is a light-curable peelable maskant designed to hold a sharp boundary through aggressive processing and then release cleanly by hand. Where a peelable maskant fits Machinists have masked selective areas with tapes, silicone boots, and hot waxes for decades. Each method struggles with the same geometry: internal fillets, blind holes, cooling passages, and air vents on castings. A liquid peelable maskant is applied over those features, cured into a continuous elastomeric film, and later stripped in one piece with no adhesive residue. Litemask™ 4201 is aimed at high-energy operations: high-velocity oxygen fuel (HVOF) and plasma thermal spray, chromium and nickel electroplating, and acid stripping of worn coatings. The film has to survive grit-blast preheat, bath agitation, and elevated temperature without lifting at the mask line. Cure options and how to control them Litemask™ 4201 cures under UV, visible, or LED light, with heat or a surface activator as secondary paths. The primary reaction is radical photopolymerization of acrylated oligomers, driven by energy in the 365–405 nm band. Two variables govern a repeatable cure: delivered dose, measured in millijoules per square centimeter with a bench radiometer, and exposure of every masked surface to that dose. Recessed pockets and the shadowed side of standing features receive far less energy than the line-of-sight surface. For those regions, a short heat cycle or activator wipe finishes the film so it does not stay tacky. Lamp output drops as bulbs and LED arrays age, so periodic radiometer checks and a controlled conveyor speed keep the process in band. For inline curing, an Incure CDM UV conveyor pairs a fixed lamp head with a known belt speed, and Incure L-Series UV LED flood lamps cover batch trays at a measured intensity. Chemical and thermal resistance The cured film resists chemical etching and acid stripping baths, and the formulation is 100% solids with no volatile organic compounds. For thermal spray masking, 4201 is engineered so the film can be removed after exposure above 600°C during the HVOF or plasma process. That thermal history matters: a maskant that has been heat-soaked becomes stiffer and less extensible, so the film is easiest to peel while it is still warm and before it fully embrittles. Application and film build Low viscosity lets 4201 be dip-coated, flow-coated, brushed, or dispensed by robot, and it penetrates narrow gaps and threads. Film thickness is built with one or more passes and checked with a wet-film comb. Typical work includes masking turbine blade platforms and internal air passages, aerospace hardware headed for selective plating, and automotive parts moving through paint and plating lines. Failure modes to design against Most masking defects trace to one of four causes. Bleed-under happens when plating solution wicks along the substrate beneath the mask edge; an oil-free, clean surface and an adequate cured edge bead prevent it. Incomplete cure in thick sections leaves…

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August 23, 2024