Electronics that operate at altitude face a problem sea-level designs ignore: as air pressure drops, its dielectric strength drops with it, and voltages that were safely separated on the ground can arc. Incure Pyra-Sil™ 905 is a UV-cure silicone sealant formulated to conformal-coat boards against moisture and against high-altitude arcing. The high-altitude arcing problem Air is an insulator, but a weak one, and its insulating ability falls with pressure. A circuit with high-voltage nodes, a power supply, an ignition driver, a sensor excitation rail, that is reliable at sea level can flash over between conductors at cruise altitude or in a depressurized bay. A dielectric conformal coating fills the space around and between those conductors with a solid insulator, raising the breakdown voltage well above what thin air provides. 905 is designed for that role: a silicone film that both seals against moisture and provides the dielectric barrier that suppresses corona and arcing at altitude. What Pyra-Sil™ 905 is 905 is a one-part UV/moisture-cure silicone adhesive sealant. It cures primarily under UV light, fixing exposed material in seconds, with a secondary moisture cure that completes shadowed regions within about 72 hours. The cured film is flexible and durable and resists ozone, weathering, and elevated temperature. It is specifically formulated for use as a conformal coating on printed circuit boards and components, and it also serves general bonding, sealing, and encapsulation. Where it is used Aerospace: avionics, power electronics, and instrumentation operating at altitude or in unpressurized zones. Consumer and industrial electronics: boards exposed to humidity that also carry higher-voltage nodes. Renewable energy: string inverters and combiner electronics with high DC bus voltages in outdoor enclosures. General industrial manufacturing: sealing and encapsulation where a flexible, dielectric silicone is needed. Application and cure control 905 is applied by manual brushing for repair and low volume, or by automated dispensing or spray for production. The UV step needs a measured dose, verified with a radiometer, with allowance for lamp aging. Batch fixturing under Incure L-Series UV LED flood lamps covers trays at a set intensity, and inline curing runs on an Incure CDM UV conveyor. For arcing suppression, coverage between high-voltage conductors has to be complete and of adequate thickness. A thin spot or a bubble at a critical gap is where flashover starts. Inspect under magnification, and if inspectability is required, ask about the Pyra-Sil™ grades that fluoresce under blacklight. For help matching Pyra-Sil™ 905 to a board's voltage map and altitude requirement, Email Us with the details. Failure modes to design against Voids or bubbles at a high-voltage gap: air pockets in the film defeat the dielectric barrier. Dispense to avoid entrapment and allow the film to wet out fully. Thin coverage between conductors: control film thickness where it matters most, not just overall. Assuming the UV fix is a full cure: shadowed material needs its moisture-cure time, up to about 72 hours, before the board is qualified. Contamination under the film: clean and dry the board; residue undermines both sealing…

RTV silicone is the default when a joint has to flex, tolerate heat, and shrug off weather. What it has never been is fast. Incure Pyra-Sil™ 904 is a one-part RTV silicone rubber that cures primarily under UV light, with a secondary moisture cure for shadowed areas, so it fits a production takt time. RTV silicone with a fast fixture A conventional room-temperature-vulcanizing silicone develops strength over hours and days as atmospheric moisture works into the film. That is fine for a field seal and a problem for an assembly line, where the part has to be handled and moved within seconds of dispensing. 904 fixes under UV in seconds. The exposed silicone gels and holds parts in position immediately; the moisture cure then completes any material the light could not reach. The finished joint has the flexibility, ozone resistance, and temperature range of an RTV silicone without the line dwell. What Pyra-Sil™ 904 is 904 is a one-part UV/moisture-cure silicone adhesive usable as a form-in-place gasket, a conformal coating, or a sealant. The cured rubber resists ozone, harsh weather, and elevated temperature, making it a fit for outdoor and engine-bay environments. Bonding and sealing dissimilar substrates Because silicone stays compliant, 904 is useful where two materials with different expansion rates are joined, a metal bracket to a plastic housing, a glass window to a metal frame. A rigid adhesive concentrates thermal-cycling strain at the interface and eventually cracks; a silicone rubber joint stretches and relaxes with each cycle. The general mechanism is described in how CTE mismatch causes adhesive bond failure. Where it is used Consumer and industrial electronics: bonding and sealing components and enclosures. Automotive: securing sensors and connectors, sealing covers and housings against weather and vibration. Marine and offshore: sealing electrical enclosures and deck hardware against salt spray and UV. General industrial manufacturing: flexible bonding and sealing across a wide temperature range. Application and cure control 904 is applied by manual brushing for low volume, or by automated dispensing or spray for production. The UV step needs a measured dose; verify with a radiometer and allow for lamp aging. Batch work cures under Incure L-Series UV LED flood lamps at a set intensity, and inline work runs on an Incure CDM UV conveyor. For help matching Pyra-Sil™ 904 to a substrate pair, seal geometry, or environment, Email Us with the part details. Failure modes to design against Treating the UV fix as a full cure: shadowed silicone needs its moisture-cure time before the joint carries load or pressure. Low-humidity cure environments: the secondary cure slows in dry air, so fully shadowed sections take longer. Bead gaps in a FIPG seal: control the dispense path and inspect before closing the housing. Bonding an untreated low-energy plastic: clean the surface and, for difficult substrates, use a silicone primer. Surface preparation for dissimilar substrates A silicone joint between two different materials only lasts if both surfaces are properly prepared. Metals should be degreased and, for demanding service, lightly abraded to…

Silicone gives an assembly flexibility, a wide temperature range, and weather resistance. Its usual drawback is cure speed: a moisture cure can take hours and stalls in shadowed areas. Incure Pyra-Sil™ 901 is a one-part silicone rubber that cures primarily with UV light and finishes in shadow with a secondary moisture cure. The dual-cure advantage A UV-only silicone cannot cure where light does not reach, under an opaque part, inside a lap joint, or in the shadow of a standing component. A moisture-only silicone cures everywhere but slowly, and thick sections take a long time. 901 combines both. UV light fixes the exposed material in seconds, locking parts in position and letting the line index forward. The secondary moisture cure then completes hidden and shadowed regions over the following hours, so the final part is fully cured throughout without holding the assembly on the line. What Pyra-Sil™ 901 is 901 is a one-part UV/moisture-cure silicone adhesive that works as a form-in-place gasket (FIPG), a conformal coating, or a sealant. The cured rubber resists ozone, weathering, and elevated temperature, which suits it to outdoor and under-hood service. Where it is used Consumer and industrial electronics: bonding and sealing components in enclosures and modules. Automotive: securing sensors and connectors, and forming gaskets on housings and covers. Renewable energy: sealing inverter and combiner-box enclosures, and gasketing outdoor electrical housings against weather and UV. General industrial manufacturing: general-purpose bonding and sealing where a flexible, temperature-tolerant joint is needed. Form-in-place gasketing For FIPG use, 901 is dispensed as a bead along a sealing flange, given a UV pass to fix the bead so the housing can be closed and moved, and then left to complete its moisture cure. The result is a gasket shaped exactly to the flange with no die-cut part to inventory and no compression set from a pre-formed gasket sitting in storage. Dispense path control and bead consistency matter more than for a bonding application, because a gap in the bead is a leak path. An automated dispense head and a fixed UV station give repeatable results. Application and cure control 901 is applied by manual brushing for repair and low volume, or by automated dispensing or spray for production. The UV step needs a measured dose; verify it with a radiometer and account for lamp aging. Batch fixturing under Incure L-Series UV LED flood lamps covers trays at a set intensity, and inline work runs on an Incure CDM UV conveyor. For help matching Pyra-Sil™ 901 to a gasket flange, seal geometry, or bonding application, Email Us with the part details. Failure modes to design against Assuming the UV fix is a full cure: shadowed material still needs its moisture-cure time before the part sees load or pressure. Bead gaps in a FIPG seal: control dispense path and flow rate; inspect the bead before closing the housing. Curing in very dry air: the secondary moisture cure slows when humidity is low; deep or fully shadowed sections may need more time. Expansion…

A conformal coating you cannot inspect is a coating you cannot trust. A missed edge, a thin spot over a via, or a skip behind a tall capacitor is invisible under white light and becomes a field failure later. Incure Pyra-Sil™ 891 is a silicone conformal coating that fluoresces under blacklight so coverage can be verified. Why inspectability matters Coverage defects are the dominant cause of conformal coating failures. Under ordinary lighting, a clear silicone film over a green solder mask is nearly impossible to assess. An operator or camera cannot reliably tell a coated area from an uncoated one, or a full-thickness film from a thin skim. 891 contains a fluorescent tracer that lights up under a blacklight, turning coverage into something you can see and, with a vision system, measure. Coated areas glow uniformly; skips, thin spots, and runs stand out. That closes the loop between application and quality, and it supports the inspection requirements of standards such as IPC-A-610. What Pyra-Sil™ 891 is 891 is a one-part, room-temperature-cure silicone coating for sealing, potting, seam-filling, and encapsulation. It cures tack-free in about 8 minutes, so boards move quickly from coating to inspection to packing. The cured film is flexible and durable, protecting against moisture, weathering, UV, and elevated temperature, and staying compliant through thermal cycling. It is compatible with metals and plastics. Where it is used Consumer and industrial electronics: boards, sensors, and connectors where coverage must be verified for quality records. Automotive: control units and sensor housings on safety-related systems. Aerospace: avionics and instrumentation with formal inspection requirements. Industrial automation: motor drives, I/O modules, and controller boards in dusty, humid plant environments. Application and inspection 891 is brushed for repair and low volume, or applied by automated dispensing or spray in production. After a short tack-free wait, boards pass under a blacklight station, either a manual operator check or an automated optical inspection tuned to the tracer's emission. Set an inspection standard: uniform fluorescence across intended areas, no dark skips at component knees or vias, no pooling in keep-out zones, and clean edges at masked connectors. For light-cure coatings, curing can be integrated on an Incure CDM UV conveyor; the coating-chemistry trade-offs are covered with the Incure L-Series flood lamp guide. For help setting up blacklight inspection for Pyra-Sil™ 891, Email Us with your board layout and inspection method. Failure modes to design against Relying on inspection to fix a bad process: the tracer shows defects; it does not prevent them. Use it to tune the applicator, not to sort scrap. Contamination under the film: clean and dry the board first, regardless of how good coverage looks. Ambient light washing out the tracer: the inspection station needs to be shielded from white light. Cracking over a rigid expansion mismatch: avoid excessive thickness over sharp interfaces; see how CTE mismatch causes adhesive bond failure. Building an inspection standard around the tracer The tracer is only useful if the inspection has a defined pass criterion. Write it in terms…

A conformal coating step is only as good as its throughput. If boards have to sit on racks for hours before they can be handled, the coating cell becomes the bottleneck. Incure Pyra-Sil™ 880 is a one-part silicone conformal coating with a short tack-free time built for production flow. What Pyra-Sil™ 880 is 880 is a one-part, room-temperature-cure silicone coating for sealing, potting, seam-filling, and encapsulation. It cures tack-free in about 15 minutes, so coated boards can be moved, inspected, and stacked without a long staging area. The cured film is flexible and durable. It protects against moisture, weathering, UV, and elevated temperature, and it stays compliant through thermal cycling so it does not crack or peel away from tall components and solder joints. It is compatible with metals and plastics. Why silicone for a fast-flow line Acrylic coatings dry fast by solvent flash but carry the flammability and emissions of that solvent. Urethanes cure hard and can crack under thermal cycling. Silicone gives a wide temperature range and lasting flexibility with a 100% reactive, one-part chemistry: no mixing, no pot life, no metering pumps to maintain. The condensation cure uses atmospheric moisture and works from the surface inward, so thin films skin quickly while deep potted sections cure from the top down and need more time. Where it is used Consumer and industrial electronics: boards, sensors, and connectors in humid or contaminated environments. Automotive: control units, harness junctions, and sensor housings. Aerospace: avionics, control systems, and instrumentation. Rail and transit: traction control, signaling, and door-system electronics subject to vibration, humidity, and wide temperature swings. Application and line integration 880 is brushed for repair and low volume, or applied by automated dispensing or spray for production. On a moving line, the short tack-free time means a compact conveyor buffer replaces a room full of drying racks. For light-cure coating chemistries, an Incure CDM UV conveyor pairs a fixed lamp with a known belt speed, and the coating-chemistry trade-offs are covered alongside the Incure L-Series flood lamp guide. Coverage still governs protection. Inspect coated boards under magnification for thin spots at component knees, vias, and board edges. If inspectability is a requirement, ask about the Pyra-Sil™ grades that fluoresce under blacklight. For help matching Pyra-Sil™ 880 to a line speed and board mix, Email Us with the throughput target and assembly details. Failure modes to design against Trapped flux or solvent under the film: clean and dry the board before coating. Thin coverage at edges and vias: control film thickness; inspect every board. Coating over areas that must mate or dissipate heat later: mask connectors and thermal pads. Cracking over a rigid expansion mismatch: avoid excessive thickness over sharp interfaces; see how CTE mismatch causes adhesive bond failure. Controlling film thickness on a fast line A short tack-free time only helps throughput if the film going down is consistent. Spray application gives even thin-film coverage on open board areas but tends to under-build on the shadowed sides of tall components, where…

Corrosion on a circuit board rarely announces itself. It starts as a trace of moisture and ionic residue at a lead, grows into a resistive path, and shows up months later as an intermittent fault. Incure Pyra-Sil™ 872 is a fast-curing silicone conformal coating aimed at stopping that sequence before it begins. The corrosion mechanism Electrochemical corrosion on electronics needs three things: moisture, an ionic contaminant, and a voltage bias between conductors. Humidity and condensation supply the moisture. Flux residue, handling salts, and airborne pollutants supply the ions. The circuit itself supplies the bias. A conformal coating breaks the chain by keeping liquid water off the conductor surface and isolating the ionic contaminants from the moisture film. Silicone is well suited to this because it stays flexible and adherent across a wide temperature range and resists UV and weathering, so the barrier does not degrade in outdoor or under-hood service. What Pyra-Sil™ 872 is 872 is a one-part, room-temperature-cure silicone coating for sealing, potting, seam-filling, and encapsulation. It cures tack-free in about 15 minutes, which allows quick handling and keeps boards moving through a coating cell without long staging racks. The cured film is flexible and durable, protecting against weathering, moisture, UV exposure, and elevated temperature. It is compatible with metals and plastics, so it can seal the transition from a board edge onto a connector shell or housing without lifting. Where it is used Consumer and industrial electronics: boards, sensors, and connectors in humid or washdown environments. Automotive: control units and sensor housings exposed to road salt, spray, and condensation. Aerospace: avionics and instrumentation subject to altitude cycling and cabin humidity. Marine and offshore: navigation, monitoring, and power electronics in salt-fog conditions, where corrosion protection is the primary design driver. Application and cure 872 is brushed for repair and low volume, or applied by automated dispensing systems in production. The condensation cure proceeds from the surface inward and uses atmospheric moisture, so thin films reach tack-free quickly while thick potted sections cure from the top down and need more time. Coverage is the variable that determines corrosion performance. A pinhole, a thin spot at a component knee, or an uncoated via is a direct path for moisture. Inspect under magnification, and where an inspectable coating is required, ask about the Pyra-Sil™ grades that fluoresce under blacklight. Line curing for light-cure coatings can be integrated with an Incure CDM UV conveyor, and the broader coating-chemistry trade-offs are discussed alongside the Incure L-Series flood lamp guide. For help matching Pyra-Sil™ 872 to a corrosion environment and board layout, Email Us with the details. Failure modes to design against Contamination under the coating: flux and salts trapped beneath the film corrode from within. Clean and dry the board first; a coating over a dirty board can make corrosion worse by concentrating moisture. Thin coverage at edges and vias: the most common ingress point. Control film thickness and inspect. Coating a connector that must mate later: mask contact areas before coating. Cracking over…

Electronic assemblies fail in the field for predictable reasons: moisture bridging conductors, condensation under thermal cycling, dust drawing current across a gap. A conformal coating is the barrier that keeps those mechanisms from reaching the circuit. Incure Pyra-Sil™ 864 is a one-part silicone conformal coating built for that job. What Pyra-Sil™ 864 is Pyra-Sil™ 864 is a one-part, room-temperature-cure silicone coating for sealing, potting, seam-filling, and encapsulation. It is applied over a populated board or sub-assembly and cures into a flexible film that protects against moisture, temperature extremes, weathering, and airborne contaminants. Silicone chemistry gives it a wide service temperature range and long-term flexibility that acrylic and urethane coatings do not match. The film stays compliant when a board goes through repeated heating and cooling, so it does not crack away from tall components or solder joints. Cure behavior 864 offers two cure routes. At room temperature it develops a handleable surface in roughly five minutes. With heat, surface cure is much faster, on the order of 25 seconds at 150°C. That flexibility lets a line run at ambient conditions for low volume or add a short heat pass for throughput. The reaction is a condensation cure that proceeds from the surface inward and consumes atmospheric moisture, so thick sections and enclosed volumes cure more slowly than thin films. For potting or deep seam-fill, allow additional time or stage the fill in lifts. Where it is used Pyra-Sil™ 864 protects components across several industries: Consumer and industrial electronics: printed circuit boards, sensors, and connectors exposed to humidity and handling. Automotive: electronic control units, wiring harness junctions, and sensor housings. Aerospace: avionics, control systems, and instrumentation subject to altitude and thermal swings. Renewable energy: photovoltaic junction boxes, inverter control boards, and outdoor sensor electronics that see weather, UV, and daily temperature cycling. Application 864 can be brushed by hand for repair and low volume, or applied by automated dispensing or spray systems for production. It is compatible with metals and plastics, so it can bridge from a board onto a housing without disbonding at the transition. For coverage verification, adjacent Pyra-Sil™ grades fluoresce under blacklight; if inspectability is a requirement, ask about those. Curing throughput on a line can be raised with an Incure CDM UV conveyor for light-cure grades, and the trade-offs between silicone and light-cure coating chemistries are discussed in the Incure L-Series flood lamp guide. Failure modes to design against Thin or missed coverage at a component edge or via: the most common cause of moisture ingress. Inspect under magnification and, where possible, under blacklight with an inspectable grade. Trapped solvent or flux residue under the coating: drives corrosion from within. Clean and dry the board before coating. Cracking at a rigid interface: rare with silicone but possible if the film is applied too thick over a sharp thermal-expansion mismatch. Differential expansion between materials is covered in how CTE mismatch causes adhesive bond failure. Slow cure in a deep pot: the condensation reaction needs moisture access; deep fills…

Masking for plating, coating, or blasting is usually done with tape and plugs, which is slow, leaks at the edges, and leaves adhesive residue. A brushable peelable mask solves all three problems at once. Incure Pyra-Sil™ 894 is a one-part sealant built for that use. What Pyra-Sil™ 894 is Pyra-Sil™ 894 is a one-part, self-leveling peelable coating that forms a tough, flexible skin over the areas you need to keep clean during a finishing operation, then peels off in one piece afterward. It cures by reaction with atmospheric moisture, reaching a tack-free surface in about 15 minutes, and it can be applied by brush, spray, dip, or automated dispensing. The cured film resists weathering, moisture, UV exposure, and elevated temperature. Because it conforms to the surface and self-levels, it seals around threads, bores, and irregular features that tape cannot follow, and it removes without leaving residue on metals, most plastics, and finished surfaces. Key properties and what they mean Conformal sealing. The coating flows into and around features, so there is no gap at the mask edge for plating solution, paint, or blast media to creep under. Clean, one-piece peel. The film comes off intact and leaves no adhesive to clean up, unlike tape. Fast tack-free time. A roughly 15-minute skin lets parts move to the next step quickly. Process resistance. The cured film withstands the moisture, temperature, and handling of typical wet finishing lines. Where Pyra-Sil™ 894 fits Electroplating and anodizing: masking bores, threads, sealing faces, and electrical contact areas that must stay bare. Painting and powder coating: keeping fastener holes, ground points, and mating surfaces free of overspray. Abrasive blasting and shot peening: protecting finished or threaded areas next to the zone being treated. Chemical etching and passivation: shielding areas that must not be attacked by the bath. Metal finishing shops: general selective masking on machined parts before surface treatment. Application practice Begin with a clean, dry surface; oil or moisture under the mask reduces adhesion and lets it lift during processing. Apply an even film at the datasheet thickness. On sharp edges and around small features, build the film slightly heavier so it does not thin out and tear. Allow a full cure, not just tack-free, before immersing parts or exposing them to blast media. After processing, lift an edge and peel the film back on itself. If the mask must resist a long immersion or an aggressive bath, test the exposure on a sample coupon first and adjust film thickness accordingly. For a specific bath chemistry or blast setup, Email Us with the process details and we can advise on film build and cure. Failure modes and prevention Bath or overspray creeps under the mask edge: the film was too thin at the edge or applied over contamination. Build the edge heavier and improve cleaning. Mask lifts during immersion: incomplete cure or a wet surface. Dry the part and allow a full cure. Film tears on removal: coat too thin. Increase thickness on the next run.…