A temperature reading is only as reliable as the probe taking it. When a thermocouple sheath or sensor housing oxidizes and corrodes in a hot process, it wears thin and the probe has to be replaced, often in the middle of a production run. A thermocouple sheath oxidation protection coating extends the probe's life. Q: How Does a Coating Protect a Thermocouple Sheath? A: It Adds a Sealed, Heat-Stable Barrier Between the Sheath Metal and the Process Sheathed thermocouples and sensor housings are usually made from heat-resistant alloys. Even those alloys oxidize over time in hot, oxidizing atmospheres. Corrosive gases, salts and process splash speed the damage. A protective coating puts an inert layer between the sheath and that environment, so the metal underneath degrades more slowly. Incure's Epo-Weld™ HTSG-791 is a single-part silicone-glass coating suited to this job. Its silicone binder is filled with glass frit that fuses during a heat cure into a continuous inorganic glass film. Incure rates it for continuous service up to 1,400°F. The catalog specifically lists thermocouple sheaths, sensor housings and probe bodies among its applications, to guard against oxidation and chemical contamination in extreme-temperature measurement. Why a Glass-Based Barrier Suits Sensors Chemically inert after cure. Incure describes the fused glass matrix as chemically inert and non-absorbent to moisture, with resistance to humidity, acids, alkalis and salt spray. That combination matters for probes in flue gas, chemical process lines and outdoor equipment. No carbonizing or outgassing. Organic paints and polymer coatings carbonize when heated beyond their limits. Incure states HTSG-791 provides stable oxidation protection across its rated range without degradation, outgassing or delamination. Outgassing near a sensor is unwelcome, because it can deposit residue on nearby surfaces or windows. Thin and conformable. At 400–800 cps, HTSG-791 brushes onto small diameters, bends and fittings. That makes it practical on probe bodies and compact housings, not only flat panels. Email Us with your sheath alloy, probe dimensions, process temperature and atmosphere to confirm whether HTSG-791 suits your sensors. Coating Without Disturbing the Measurement A sensor coating has to protect the probe without changing what it measures. A few practical points help. Keep the film thin where response time matters. Any added layer on the sensing tip adds a little thermal mass. Coat the sheath length exposed to attack, and judge whether the very tip needs the same build as the body. Do not coat electrical connections or seals. Mask terminal heads, connector threads and any surface that must stay conductive or mate with a fitting. Coat before installation where possible. HTSG-791 needs a 1-hour cure at 400°F to fuse the glass. That is easiest on the bench in an oven before the probe goes into service. Verify after coating. Check a coated probe against a reference reading before relying on it in a controlled process. Applying HTSG-791 to Probes and Housings Clean and dry. Remove oils, handling residue and loose oxide. Incure specifies application to a clean, dry substrate. Brush or spray an even coat over…

Stainless steel resists corrosion at room temperature, but furnace heat changes the picture. In hot, oxidizing air, even stainless grows scale, pits and slowly loses section. A high temperature coating to prevent stainless steel oxidation adds a sealed barrier on top of the metal's own protection. Q: Why Does Stainless Steel Need a Coating at High Temperature? A: Because Its Natural Oxide Layer Alone Is Not Always Enough in Sustained Heat Stainless steel protects itself with a thin, chromium-rich oxide film. In ordinary service that film is enough. In hot, oxidizing atmospheres, and especially with corrosive gases, thermal cycling or chemical splash, the protection can be outpaced. Then the surface scales, pits and roughens over repeated heat cycles. Glass-based coatings are one recognized way to shield steel at high temperature: a continuous glass layer slows oxygen and corrosive species on their way to the metal. Incure's Epo-Weld™ HTSG-791 works on this principle. It is a single-part silicone-glass coating with a silicone binder filled with glass frit. During its heat cure the frit fuses into a continuous inorganic glass film. Incure rates HTSG-791 for continuous service up to 1,400°F and describes the silicone-glass layer as supplementing the native oxide passivation layer on stainless steel. It does not replace that layer. What HTSG-791 Brings to Stainless Components Oxidation and scaling protection for fixtures, brackets and structural parts in high-temperature oxidizing atmospheres. Chemical resistance after full cure to humidity, acids, alkalis and salt spray, per Incure's catalog. A hard, inorganic finish at Shore D70 that does not carbonize the way organic paints do on first heating. Adhesion through the cure itself: Incure states the system bonds mechanically and chemically to metal oxide surfaces during the initial heat cure. Beyond stainless steel, Incure lists adhesion to carbon steel, cast iron, ceramics and porous refractories. One product can therefore cover mixed assemblies such as a stainless bracket bolted to a cast-iron housing. Email Us with your stainless grade, operating temperature and atmosphere to confirm whether HTSG-791 fits your components. Applying HTSG-791 to Stainless Steel The coating's performance depends on a clean start and a complete cure. Clean and dry the surface. Remove oil, cutting fluids, fingerprints and loose oxide. Incure specifies application to a clean, dry substrate. Brush or spray. HTSG-791's 400–800 cps viscosity gives a workable consistency for brushing complex shapes, and it can also be sprayed. Build thickness in coats. Incure notes that multiple coats can be applied to increase film thickness and coating density. Thin, even coats are less likely to crack than one heavy layer. Heat cure. Cure at 400°F for 1 hour. This step fuses the glass frit into a continuous film. There is no room-temperature cure option. First service heat-up. Incure notes the coating reaches full oxidation resistance and adhesion on its first excursion to service temperature. Where Coated Stainless Parts Benefit Furnace fixtures, trays and brackets that cycle in and out of oxidizing heat. Structural supports near burners, flues and hot gas paths. Radiant tubes and manifold assemblies…

Chemical plants often face two enemies at once: aggressive chemicals and serious heat. Many chemical-resistant coatings handle the first and fail at the second. A high temperature chemical resistant coating for process equipment has to hold up against acids, alkalis and salts while the metal underneath runs hot. Q: What Makes a Coating Both Chemical- and Heat-Resistant? A: An Inorganic Barrier That Does Not Soften, Burn or Absorb Moisture Most chemical-resistant coatings are organic: epoxies, polyurethanes and similar resins. They resist many chemicals well, but organic binders have temperature limits. Push past them, and the coating softens, degrades or carbonizes, and the chemical protection goes with it. Inorganic, glass-based barriers avoid that weakness. A fused glass layer has no organic binder left to burn, and glass is chemically inert to many process chemicals. Incure's Epo-Weld™ HTSG-791 works this way. It is a single-part silicone-glass coating whose glass frit fuses during a heat cure into a continuous inorganic glass film. Incure rates HTSG-791 for continuous service up to 1,400°F. After full cure, the catalog lists resistance to humidity, acids, alkalis and salt spray, and describes the glass matrix as chemically inert and non-absorbent to moisture. Equipment Where HTSG-791 Fits Incure's catalog points HTSG-791 at equipment where heat and chemical attack combine: Reactor vessels and their external surfaces near heated zones. Chemical storage tanks exposed to heat and corrosive vapors. Process pipework carrying hot, aggressive media. Heat exchanger tube bundles and headers in high-temperature gas streams. Exhaust stacks, manifolds and flue gas ducting, where Incure notes protection against sulfur-bearing gas corrosion. Boiler casings and outdoor equipment that combine weather exposure with high operating temperatures. Because HTSG-791 adheres to steel, stainless steel, cast iron, ceramics and porous refractories, one coating can protect mixed-material equipment. Incure also recommends it for sealing porous ceramics, which helps keep corrosive species out of refractory surfaces. Email Us with the chemicals involved, operating temperature and substrate to confirm whether HTSG-791 fits your equipment. Qualifying a Coating for Your Chemical Environment "Acid resistant" and "alkali resistant" describe broad families, not every chemical at every concentration and temperature. Treat qualification as part of specifying the coating: List the exposure honestly. Note each chemical, its concentration, phase (liquid, vapor or splash) and the metal temperature at the coated surface. Test coupons first. Coat sample panels of the actual substrate, cure them per the schedule and expose them to the real media at temperature. Inspect for the right signs. Look for blistering, softening, discoloration or loss of adhesion at edges and scratches, not just overall appearance. Plan touch-up access. Coatings fail first at damage points. Decide in advance how a scratched or impacted area will be repaired and re-cured. Application and Cure HTSG-791 is applied by brush or spray to a clean, dry surface. Its 400–800 cps viscosity suits brushing complex shapes such as flanges, nozzles and pipe bends. Incure notes that multiple coats can be applied to raise film thickness and coating density, and that matters most for chemical barrier service.…

A bare aluminum heat sink conducts heat well but sheds very little of it as radiation. Its shiny surface reflects instead of emits. A high emissivity coating for aluminum and copper heat sinks adds a second cooling path, radiation, on top of the convection the fins already provide. Q: Why Coat an Aluminum or Copper Heat Sink for Emissivity? A: To Add Radiative Cooling That Bare Metal Surfaces Barely Provide Every surface loses heat in two ways: to the surrounding air by convection, and as infrared radiation. How well a surface radiates depends on its emissivity. Bright, bare aluminum and copper are poor radiators, so almost all of their cooling comes from airflow. A dark, high-emissivity ceramic coating changes that balance. It lets the same heat sink, or the outer wall of an electrical enclosure, radiate far more heat without a larger fan or more fin area. The gain is most useful where airflow is limited: sealed enclosures, natural-convection heat sinks and equipment in still air. Incure's grade for this job is Epo-Weld™ HECC-636, a silicone-ceramic emissivity coating developed specifically for non-ferrous metals such as aluminum and copper, rated by Incure for service up to 1,100°F. Why HECC-636 Differs From the Rest of the HECC Line The other Epo-Weld™ HECC grades are built for furnaces, kilns and steel process equipment running far hotter. HECC-636 is the line's lower-temperature, non-ferrous specialist, and two details explain why. A flexible silicone binder. Aluminum and copper expand considerably more with heat than a rigid ceramic coating does. Incure's catalog notes that HECC-636's flexible silicone binder and ceramic fillers resist cracking and delamination caused by that thermal expansion mismatch. A rigid furnace coating on aluminum is far more likely to craze or flake over repeated heating and cooling. A thin, low-viscosity film. HECC-636 lists a viscosity of 500–750 cps, the lowest in the HECC line (the furnace grades run 1,000–4,000 cps). A thin coating suits fin arrays, where a thick, heavy layer could fill fin gaps, restrict airflow and insulate rather than help. Like the other grades in the line, HECC-636 lists 1,100 PSI flexural strength, 300 PSI tensile shear strength and a cure of 1 hour at 200°F. Where It Is Used Incure recommends HECC-636 for heat sinks and electrical enclosures. Typical candidates include: Passive and natural-convection heat sinks on power electronics, LED drivers and industrial controls. Sealed electrical enclosures whose outer walls must reject internal heat without vents. Copper or aluminum heat spreaders and housings in still-air or outdoor locations. Incure's catalog also lists resistance to moisture, chemicals and weathering, which matters for enclosures mounted outdoors or in washdown areas. Email Us with your heat sink or enclosure material, operating temperature and airflow conditions to confirm whether HECC-636 fits. Applying the Coating to Fins and Enclosures Degrease thoroughly. Machining oils and fingerprints on aluminum and copper block adhesion and are where peeling starts. Coat evenly and thinly. Aim to cover fin surfaces without bridging the gaps between fins. A sprayed or brushed thin…

In a fired heater, the tubes carry the process load, and how well their steel surface absorbs radiant heat sets how much fuel the burners need. A high emissivity coating for steel heater tubes and heat exchangers turns a reflective, oxidizing metal surface into one that absorbs radiant heat efficiently and resists scaling. Q: What Does a High Emissivity Coating Do on Steel Tubes? A: It Improves Radiant Heat Absorption and Protects the Steel Surface Most heat reaches a furnace tube as radiation from the flame and hot refractory. A surface's ability to absorb that radiation tracks its emissivity, so bare or partly reflective steel absorbs less of the available heat. A high-emissivity coating improves absorption, so more energy reaches the process for the same firing. The coating also shields the steel. Incure's catalog describes both steel grades as resisting oxidation and scaling at high temperatures, and that matters because oxidation is often what thins tube walls over time. Incure offers two grades for steel in its Epo-Weld™ HECC line: Epo-Weld™ HECC-618: an emissivity coating for carbon and stainless steel, designed for heating tubes and exchangers. Epo-Weld™ HECC-627: an ultra-high-temperature emissivity coating for steel alloys in extreme environments, rated by Incure to 2,400°F, for high-temperature process vessels and stacks. HECC-618 vs. HECC-627 HECC-618 HECC-627 Target substrate Carbon and stainless steel Steel alloys in extreme environments Stated temperature rating Not specified in the catalog Up to 2,400°F Viscosity 2,000–3,000 cps 3,000–4,000 cps Flexural / tensile shear 1,100 / 300 PSI 1,100 / 300 PSI Cure 1 hr at 200°F 1 hr at 200°F Typical parts Heating tubes, heat exchangers Process vessels, stacks The practical difference is the operating envelope. HECC-618 is the general grade for carbon and stainless steel tubes and exchangers. HECC-627 is the step up when the steel runs in the hottest zones or in severe thermal stress, where its 2,400°F rating gives the margin. Choosing Between Them Start with metal temperature, not flame temperature. The coating sees the tube surface temperature. If the surface approaches the upper end of what carbon or stainless steel equipment normally sees, plan on HECC-627. Match the part type. Incure points HECC-618 at heating tubes and exchangers and HECC-627 at process vessels and stacks. Consider film build. HECC-627's higher viscosity builds a heavier coat per pass; HECC-618's lower viscosity spreads more easily over long tube runs. Plan the cure. Both grades list 1 hour at 200°F. In the field, that usually means a controlled first heat-up, or a heat source applied to the coated section before full service. Email Us with the tube or vessel alloy, surface temperature and furnace atmosphere to confirm the right grade. Surface Preparation on Steel Emissivity coatings bond only as well as the surface allows. Loose mill scale, rust and combustion deposits must come off first, or the coating will flake off with them. Degrease after cleaning, and coat promptly before fresh rust forms. Incure's guide on how to apply high-emissive ceramic coating to metal substrate surfaces covers…

Coating a dense crucible is not the same job as coating soft ceramic-fiber insulation. A fiber surface soaks a coating in; a dense, non-porous ceramic or refractory metal gives it almost nothing to grip. A high emissivity coating for crucibles and dense refractories has to bond to that smooth surface and stay on through rapid heating and cooling. Q: Why Do Dense Refractories Need a Different Emissivity Coating? A: Because the Coating Has to Adhere Without Soaking Into the Surface Porous ceramic fiber absorbs a coating into its outer layer, which anchors it mechanically. Dense refractories, crucibles and refractory metals are tight and smooth by comparison, so the coating has to bond to the surface itself. A coating formulated for fiber can peel or delaminate on a dense part, especially under fast temperature changes. Incure's grade built for this is Epo-Weld™ HECC-610, a high-emissivity coating developed for dense refractories and refractory metals. Incure's catalog stresses its strong adhesion and thermal stability on dense, non-porous substrates. It also notes that HECC-610 keeps its emissivity and structural integrity under rapid thermal cycling, and recommends it for crucibles and dense furnace linings. HECC-610 vs. the Fiber Grades Incure's HECC line splits its refractory grades by surface type: HECC-601 HECC-604 HECC-610 Surface Ceramic fiber modules and linings Ceramic fiber, extreme temperature Dense refractories, refractory metals Stated rating Not specified Up to 2,400°F Not specified Viscosity 1,000–2,000 cps 3,000–4,000 cps 3,000–4,000 cps Typical parts Fiber furnace linings High-temperature kilns, incinerators Crucibles, dense linings All three list 1,100 PSI flexural strength, 300 PSI tensile shear strength and a cure of 1 hour at 200°F. The difference is the surface they are built to bond to. Use HECC-601 or HECC-604 on fiber, and HECC-610 where the surface is dense brick, castable, a crucible or refractory metal. Where HECC-610 Fits Crucibles for melting and heat treating, where a high-emissivity surface helps the crucible take in radiant heat. Dense furnace linings of brick or castable that run without a fiber hot face. Refractory metal components inside high-temperature furnaces. A furnace often contains both surface types: fiber modules on the walls and dense hearths, burner blocks or crucibles. Coating each with the matching grade avoids a single compromise coating that bonds well to one surface and poorly to the other. Email Us with your crucible or lining material, process temperature and heating rate to confirm the right HECC grade. Applying to Dense Surfaces Clean to sound material. Remove loose dust, slag, metal splash and old flaking coatings. A dense surface gives no mechanical anchor, so contamination directly weakens the bond. Keep the surface dry. Moisture in castables or brick can turn to steam during heat-up and lift the coating. Apply an even, controlled film. HECC-610's 3,000–4,000 cps viscosity builds a solid layer per pass. Avoid heavy buildup at corners and edges, where thick coating is more likely to crack. Cure before thermal cycling. Complete the 1 hour at 200°F cure before the part sees full operating temperature. Q: Can One…

A part number written in ordinary ink on a quartz heater tube is gone after the first hot cycle. A high temperature marking coating for quartz and glass has to survive the same heat as the part itself, and keep its color and grip while it does. Q: What Is a High Temperature Marking Coating for Quartz and Glass? A: A Single-Part Ceramic Coating Rated Well Above Ordinary Paint It is an inorganic, pigmented coating applied to quartz or glass to mark, color-code, block light or reflect heat on parts that run hot. Incure's Epo-Weld™ HTC grades for this job are single-part, room-temperature-cure coatings: every grade in the group lists a 24-hour cure at 77°F, with no oven step required. The base grade, Epo-Weld™ HTC-6006, is a water-based, phosphate-bonded brown-black coating rated by Incure to 2,000°F. Most of the colored grades are rated to 1,500°F, and the white reflective grade to 1,600°F. Always plan to the rating of the specific grade you order, not the family's highest figure. Matching the Grade to the Job The family splits by what the coating has to do on the part: Durable marking and coding: HTC-6006 (brown-black, 2,000°F) for halogen lamps and quartz heaters. Heavier film build: HTC-6007 (brown-black, 2,000°F) is the high-viscosity version, at 4,000–6,000 cps versus 1,500–2,500 cps for HTC-6006, for thicker coverage and opacity on high-intensity lamps. Light blocking: HTC-6013 (jet black, 1,500°F) is a high-opacity barrier for masking lighting components. Color coding: HTC-6022 (cobalt blue), HTC-6031 (gray), HTC-6059 (light green) and HTC-6060 (dark green), all rated to 1,500°F, for sorting and identifying parts by color. Reflecting heat and light: HTC-6068 (matte silver) and HTC-6069 (off-white), rated to 1,500°F, plus HTC-6070, a glass-ceramic-filled white rated to 1,600°F for infrared heaters and UV curing lamps. What the Numbers Say About Toughness Most of the colored grades share one mechanical profile in Incure's catalog: Shore D85 hardness, 11,500 PSI flexural strength and 2,300 PSI tensile shear strength. That consistency is useful. A plant can run several colors for coding without re-qualifying adhesion and hardness for each one, because only the pigment and the temperature rating change. HTC-6070 is the exception. Its glass-ceramic filler gives a slightly softer D82 surface and 8,000 PSI flexural strength, with a higher 2,400 PSI tensile shear figure and a lower 1,000–2,000 cps viscosity. Treat it as its own grade during qualification rather than as another color of HTC-6006. Email Us with your part material, peak surface temperature and what the coating needs to do (mark, block light or reflect) to confirm the right HTC grade. Preparing Quartz and Glass for a Coating That Lasts Phosphate-bonded and glass-ceramic coatings rely on a clean, oil-free surface. Fingerprints and handling oils on quartz leave a film the coating cannot bond through, and those spots are where peeling starts after thermal cycling. Clean and dry the surface first, then handle the part only by uncoated areas until the coating has cured. Film thickness matters as much as cleanliness. A heavy single coat…

Graphite tolerates extreme heat, but not oxygen at that heat. In an oxidizing furnace atmosphere, an uncoated crucible or electrode slowly burns away, pitting and thinning until it has to be replaced. A graphite oxidation protection coating puts a ceramic barrier between the carbon and the air. Q: What Does a Graphite Oxidation Protection Coating Do? A: It Seals Carbon Away From Oxygen With a Hard Ceramic Layer Graphite does not melt in a furnace; it reacts. At high temperature in air, oxygen attacks the carbon surface, and the part loses material and strength over repeated cycles. A protective coating adds a dense, heat-stable layer that oxygen has to get through before it reaches the graphite. Two ceramic chemistries are widely used for this barrier: silicon carbide, and boride-based systems. Incure offers one of each in its Epo-Weld™ high temperature coating line: Epo-Weld™ HTC-383: a single-part, silicon-carbide-based coating for graphite electrodes and susceptors. Epo-Weld™ HTC-303: a two-part, titanium-diboride-filled ceramic coating for graphite crucibles and electrodes, rated by Incure to 2,000°F. HTC-303 vs. HTC-383 at a Glance HTC-303 HTC-383 Chemistry Titanium diboride filled ceramic Silicon carbide based Components Two-part Single-part Form Thixotropic paste Thixotropic paste Tensile shear strength 1,800 PSI 350 PSI Flexural strength Not listed 1,500 PSI Cure schedule 24 hrs at 77°F 2 hrs at 77°F + 2 hrs at 200°F Typical parts Crucibles, electrodes Electrodes, susceptors The two grades differ in handling as much as in chemistry. HTC-303 is mixed from two parts and cures at room temperature, so it can go onto large graphite parts that won't fit in an oven. HTC-383 needs no mixing and finishes with a short 200°F step, which suits parts that already go through a dryer or low-temperature oven. Choosing Between the Two Start with the part and the process, not the chemistry name: Bond strength to the graphite surface. HTC-303 lists 1,800 PSI tensile shear against HTC-383's 350 PSI. Where the coating takes mechanical contact, such as charging a crucible or clamping an electrode, the higher bond figure is the safer choice. Mixing and pot life. Two-part HTC-303 adds a mixing step and a working-time window. HTC-383 is ready to apply from the container, which simplifies touch-up work. Cure access. If an oven step is impractical, HTC-303's room-temperature cure fits. If it is easy, HTC-383's 2-plus-2-hour schedule is quicker overall. Part type. Incure's catalog points HTC-303 at crucibles and electrodes and HTC-383 at electrodes and susceptors. Both suit electrodes, so the first three questions decide that case. Email Us with your graphite part, furnace atmosphere and peak temperature to confirm which grade fits. Applying the Coating to Graphite Graphite is porous and sheds fine dust, and both work against adhesion. Remove loose dust and machining residue before coating, and keep the surface free of oil or release agents. Both grades are thixotropic pastes, so they stay where they are placed on vertical faces and edges, the areas that oxidize first. Corners and edges deserve extra attention. They expose more surface to…

Ceramic fiber insulation keeps heat in, but an unsealed fiber surface sheds. Loose fibers drift onto the work, contaminate the process and wear the lining thinner with every cycle. A ceramic fiber coating for furnace linings locks the surface down and hardens it. Q: What Does a Ceramic Fiber Coating for Furnace Linings Do? A: It Seals Friable Fiber Surfaces to Stop Dusting and Harden the Face Refractory fiberboard, blanket and modules are light and insulating because they are mostly air held in a loose fiber network. That same structure makes the surface friable: it dusts, erodes in gas flow and absorbs splashes of molten metal. A sealing coating penetrates the outer fibers, binds them together and leaves a harder, cleaner face. Incure's Epo-Weld™ high temperature coating line includes several grades for this job: Epo-Weld™ HTC-338: a low-viscosity alumina-silica coating for deep penetration, applied by spraying or brushing, for large-scale fiberboard sealing and surface hardening. Epo-Weld™ HTC-330: an alumina-silica coating that seals fiber surfaces against dusting, rated by Incure to 2,300°F, for launder systems and fiber modules. Epo-Weld™ HTC-309: a high-purity aluminum oxide coating that seals alumina fiberboards in sensitive processing environments. All three list 1,100 PSI flexural strength, 300 PSI tensile shear strength and a cure of 2 hours at 77°F plus 2 hours at 200°F in Incure's catalog. Choosing by Lining Type and Process The three grades share mechanics but differ in purpose: Large areas of board to seal and harden: HTC-338. Its low viscosity lets it soak into the fiber surface rather than sit on top, and it can be sprayed, which makes coating whole panels practical. Linings that meet molten non-ferrous metal or slag: HTC-330. Incure's catalog stresses its resistance to wetting by molten non-ferrous metals and slag buildup, which makes it the fit for launders and fiber modules in metal-handling areas. High-purity processing: HTC-309. Its high-purity alumina chemistry is intended for furnace linings where dust and particulates must stay out of the product, and Incure notes its reflectivity helps thermal uniformity. A fourth grade, Epo-Weld™ HTC-329, is a phosphate-bonded alumina coating aimed at dense refractories, such as brick linings and flow control parts, rather than fiber. Choose it for abrasion resistance on hard refractory surfaces, not for sealing soft fiberboard. Email Us with your lining material, furnace atmosphere and whether molten metal contacts the surface to confirm the right grade. Industrial Coatings vs. Hobby Rigidizers Searches for fiber coatings turn up many small-container "rigidizers" aimed at hobby kilns and forges. Those products target a similar problem, but an industrial furnace lining adds demands a hobby kiln does not. These include contact with molten aluminum, process-purity requirements and large areas that have to be coated efficiently. Incure's HTC grades are specified around those industrial conditions, with defined mechanical data and cure schedules to qualify against. Applying a Sealing Coat to Fiber Remove loose material first. Brush off fibers that are already detached so the coating binds intact fibers rather than debris. Let it penetrate. The goal…

Molten aluminum that sticks to a ladle or mold costs twice: once in scrap, and again in the time spent chipping buildup off the tooling. A boron nitride release coating gives the metal a surface it will not wet, so it flows, releases and leaves the tooling clean. Q: What Is a Boron Nitride Release Coating for Metal Casting? A: A Non-Wetting Ceramic Layer That Keeps Molten Metal From Sticking Boron nitride is a ceramic that molten non-ferrous metals do not wet well. Coated onto ladles, troughs, molds and refractory parts, it keeps metal from bonding to the surface and building up. Incure's Epo-Weld™ high temperature coating line includes two boron nitride grades and one graphite grade for release and parting: Epo-Weld™ HTC-347: a hard-coat boron nitride for long-lasting, non-stick surfaces on ladles, troughs and molds. Epo-Weld™ HTC-365: a soft-coat boron nitride, applied as a consumable layer each cycle or as needed. Epo-Weld™ HTC-374: a pure graphite coating for lubrication and release in glass forming and wire drawing. All three are single-part thixotropic pastes. Each lists a cure of 2 hours at 77°F followed by 2 hours at 200°F in Incure's catalog. Hard Coat vs. Soft Coat: The Core Decision The main choice between HTC-347 and HTC-365 is how long the coating should last on the part. HTC-347 hard coat is designed as a durable surface. Incure lists resistance to molten aluminum, magnesium and salts, and recommends it for ladles, troughs and molds. Choose it where recoating every cycle would slow production and the surface sees repeated metal contact. HTC-365 soft coat is designed to be consumed. It is reapplied with each cycle or as needed, giving a fresh release layer every time. Incure recommends it for hot-top rings and transition plates, and lists strong thermal shock resistance and chemical inertness. Choose it where a renewable layer is easier to manage than keeping a permanent one intact. A practical way to decide is to count how often the coating has to be renewed today. If the answer is every shift or every cast, a consumable soft coat fits the existing routine. If recoating is a downtime event, the hard coat pays back by staying on. Where Graphite Fits Instead HTC-374 is a graphite coating, not boron nitride. Incure lists 1,100 PSI flexural and 300 PSI tensile shear strength for it, and recommends it for glass forming molds and wire drawing lubrication. Its catalog description stresses a low coefficient of friction and high thermal conductivity, and notes that it stays effective in reducing and neutral atmospheres. That atmosphere note is the key difference. Graphite is a strong lubricant, and Incure's catalog specifies its effectiveness in reducing and neutral atmospheres. Where the process runs in open air and the job is release from molten non-ferrous metal, the boron nitride grades are the better match. Graphite parts in the same cell often need joining as well as coating, which Incure covers in its guide to bonding graphite to metal with high-temperature epoxy. Email…