A cracked display window, a chipped optical lens, or a fractured architectural panel does not always need full replacement. A properly executed repair can restore both strength and appearance, but glass punishes the wrong adhesive choice more than almost any other substrate, because flaws in clarity and cure are immediately visible. Why Glass Repair Is Unforgiving Glass is rigid, non-porous, and often selected specifically for its optical clarity, which rules out adhesives that would work fine on an opaque substrate. Shrinkage during cure is the first problem. An adhesive that pulls in as it hardens introduces stress at the crack edge, and that stress can propagate the crack further instead of stopping it. Optical quality is the second. Any cloudiness, yellowing, or visible bond line defeats the purpose of a cosmetic or optical repair, and some adhesives that look clear when applied yellow over months of UV or heat exposure. Bond durability is the third. The repaired joint has to survive thermal cycling, mechanical flexing, and in outdoor or vehicle use, ongoing UV exposure, without losing adhesion or clouding. Why UV-Curable Adhesives Dominate This Repair UV-curable adhesives address all three problems directly, which is why they have become the standard for professional glass work. They remain liquid until exposed to UV light, giving unlimited time to align broken pieces exactly before curing. Once positioned, a UV lamp sets the bond in seconds rather than the hours a room-temperature adhesive would need, which matters when holding pieces in perfect alignment by hand. Formulations built for glass are optically clear and, in the better grades, resist yellowing over years of service, so the repair stays invisible rather than becoming a visible defect later. Cured properly, they form a hard, durable bond that resists moisture, common chemicals, and the coefficient-of-thermal-expansion stress that a glass-to-glass or glass-to-metal joint experiences; our guide on how CTE mismatch causes adhesive bond failure is relevant wherever glass is bonded to a different material. For glass-to-metal frames and fittings, Incure's Uni-Weld UV Glass and Metal Bonder line, including grades such as 1910, 2204VT, and 2463G, is built for exactly this pairing, and our comparison of UV glue versus epoxy for transparent bonding explains why UV chemistry usually wins over epoxy for visible glass joints. Repair Procedure Clean both fracture faces meticulously with isopropyl alcohol; any oil, dust, or fingerprint at the crack line will telegraph through the finished repair and weaken the bond. Align the pieces carefully before curing. Because the adhesive stays liquid until exposed, take the time to close the gap and match the original surface contour rather than rushing the placement. Cure completely across the full bond line. For a crack running through a thick section, a wider beam or a multi-pass exposure may be needed to reach every part of the joint; a UV LED spot lamp with a light guide gives control over exactly where the dose lands. If you are repairing an optical component and need a formulation matched to a specific refractive…

A conformal coating process that passed its original qualification can still drift into producing a rising defect rate months later, and the fix isn't re-qualifying the chemistry — it's running a structured line audit against a defect taxonomy, since most coating defects trace back to a specific, identifiable process step rather than the material itself. Building a Defect Taxonomy Before Auditing Anything An audit that logs "coating defect" without classification produces data nobody can act on. Separating defects into coverage gaps, thickness-window violations, cure-completeness failures, and masking failures turns a vague reject rate into an actionable diagnostic, since each category traces back to a different point in the process and calls for a different corrective action. Auditing for Coverage Gaps Coverage gaps — bare spots where the coating never reached — usually trace back to either dispensing-head wear on a selective coating system or inadequate dip time on a submersion process, allowing air pockets to persist under low-lying components. An audit checks recent dispensing-head maintenance records against the defect rate trend and inspects a sample of boards under UV illumination if the coating includes a fluorescent tracer, since coverage gaps are often invisible under ordinary lighting but obvious under blacklight inspection. Auditing for Thickness-Window Violations Coating applied outside its specified dry-film thickness window produces two different failure modes depending on direction — too thin and pinholes leave conductors exposed, too thick and the film becomes prone to cracking under thermal cycling. An audit pulls witness-coupon thickness data from recent production runs and checks it against the qualified window, rather than trusting that the original process settings are still being followed exactly as documented — dispensing equipment can drift in delivered volume over time even when nominal settings haven't been changed. Auditing for Cure-Completeness Failures A UV-cured coating with shadowed geometry under tall components needs its secondary moisture or heat cure verified independently from the primary UV exposure, since a board that looks fully cured at the exposed surface can still have an under-cured shadow region that eventually causes a field failure. An audit checks whether the documented secondary-cure dwell time is actually being observed on the line or has been quietly shortened over time as operators optimize for throughput without realizing the secondary cure step still matters. Email Us if you're setting up a coating-line audit and want help building a defect taxonomy specific to your coating chemistry and board geometry. Auditing Masking Practices Masking failures show up as coating in areas that should have stayed bare — connector pins, test points, thermal interfaces — or as coating wicking under a mask boundary that looked clean on visual inspection. An audit samples masked boards specifically at connector and test-point boundaries under magnification, since wicking under a mask edge is one of the easier defects to miss during routine visual inspection but one of the more consequential ones in service, since a coated connector pin can cause an intermittent connection failure that's difficult to diagnose after the fact. Correlating Defect Data…

Epoxy resin starts life as a liquid and ends as a rigid, cross-linked solid, and that transformation is what makes it one of the most versatile materials in industrial manufacturing. Understanding what happens during that change, and which properties come out of it, is the foundation for using epoxy well in bonding, coating, and potting applications. From Liquid to Thermoset An epoxy system is supplied as two components: a resin containing reactive epoxide groups and a hardener, typically an amine or anhydride. When mixed in the specified ratio, the hardener opens the epoxide rings and links resin molecules into a three-dimensional network. Once that network forms, the material cannot be melted or reshaped, which is why epoxy is classified as a thermoset rather than a thermoplastic. The mix ratio and cure temperature both matter. An off-ratio mix leaves unreacted resin or hardener in the final part, which softens the cured properties, and a cure carried out below the specified temperature may never reach full cross-link density even after the material feels hard to the touch. The Properties That Make It Useful Once fully cured, epoxy offers a combination of properties that few other polymer families match at a comparable cost. Adhesion is broad: cured epoxy bonds strongly to metals, ceramics, wood, and many plastics, which is why it dominates structural bonding. Mechanical strength is high in both tension and compression, along with solid resistance to abrasion and impact in properly toughened formulations, which lets epoxy joints and coatings carry real structural load. Chemical and moisture resistance is strong across a broad range of solvents, fuels, and aqueous chemicals, making epoxy a standard choice for protective coatings on floors, tanks, and pipe. Electrical insulation is high, with strong dielectric strength, which is why epoxy is a default material for potting and encapsulating electronic assemblies. Where Epoxy Resin Is Used Structural adhesives built on epoxy chemistry join everything from aircraft skins to automotive subframes and consumer goods, prized for combining strength with the ability to bond dissimilar materials. Our comparison of adhesive strength for heavy-duty repairs covers how epoxy stacks up against faster-curing alternatives on load-bearing joints. Protective coatings based on epoxy defend concrete, steel, and process equipment from corrosion, abrasion, and chemical attack; Incure's high-emissive ceramic coating line, covered in our guide to HECC ceramic coatings by substrate and service temperature, extends that protection into high-temperature service. Electronics potting and encapsulation use epoxy's insulating properties to protect circuits from moisture, vibration, and short circuits. Composites pair epoxy resin with reinforcing fibers such as carbon or glass to produce lightweight, high-strength structures for aerospace and wind energy. Where a bond needs to be optically clear rather than opaque, a UV-curable acrylic often outperforms epoxy; see our comparison of UV glue versus epoxy for transparent bonding for that trade-off. If you are unsure which epoxy formulation fits your substrates and service conditions, Email Us with the application details. Limitations Worth Planning Around Epoxy is versatile, but it is not the right answer for…

A two-part epoxy is judged on its cured properties, but the production headache is usually pot life, the window between mixing and the point where the material is too far along to use. Manage that window and the process runs smoothly. Misjudge it and epoxy hardens in the cup, parts get bonded with partially reacted material, and the line backs up. Pot Life Versus Working Life The two terms are related but not identical. Pot life is a standardized lab figure. A defined mass of freshly mixed epoxy, often 100 grams, sits in controlled conditions and the time to reach a set viscosity rise, commonly a doubling, is recorded. It appears on the technical data sheet and lets you compare the relative reactivity of different systems. Working life, or open time, is the practical time you actually have to dispense, position, and clamp before the epoxy is too viscous to wet the surface properly. It depends on batch size, temperature, and how the material is held, so it is often shorter than the datasheet pot life. Plan production around working life, and use datasheet pot life only as the comparison baseline. Why Heat Is the Controlling Factor The cure of an amine-hardened epoxy is exothermic: the reaction releases heat, and heat speeds the reaction. In a large mixed mass that heat has nowhere to go, so temperature climbs, the reaction accelerates, and pot life collapses far faster than a linear estimate would suggest. Three variables set how bad this feedback gets. Batch mass and shape matter most, because a deep, concentrated volume traps heat while a thin, spread film sheds it. Ambient temperature adds directly, and as a rule of thumb each 10 degree C rise roughly halves pot life. Hardener chemistry is the design lever: suppliers offer fast, medium, and slow hardeners for the same resin. Practical Control Measures Mix only what you will place within the working life, and mix more small batches rather than one large one. Immediately transfer mixed epoxy from a deep cup to a shallow tray. Spreading the same volume into a thin layer lets the exotherm dissipate and can noticeably extend usable time. Hold the shop area at a stable, moderate temperature, and keep mixed material out of direct sun and away from warm equipment. In a hot environment, switch to a slower hardener or briefly chill the mixed pot in a cool water bath. Never apply epoxy past its working life because it still looks usable; a thickened mix will not wet the substrate and the bond will be weak. Our comparison of which adhesive cures faster for quick repairs is worth reading if cycle time is the real constraint. For help matching hardener speed to your batch size and shop conditions, Email Us with your application details. Typical Pot Life Ranges Across Hardener Types Pot life varies enormously depending on the hardener system, and knowing the rough bracket helps you sanity-check a datasheet figure against your process needs. Fast, room-temperature-cure hardeners…

Once a device maker has settled on an adhesive chemistry that clears biological safety testing, the next decision is which grade to run. For disposable and external hardware such as fluid-path connectors, tubing sets, housings, and diagnostic cartridges, that choice comes down to joint geometry, viscosity, and how the adhesive will be cured and fixtured on the line. Read the Joint First Every bond falls into one of a few geometric types, and each rewards a different flow behavior. A slip-fit or telescoping joint, where one part inserts into another with a small annular gap, wants a low-viscosity adhesive that wicks into the clearance by capillary action after assembly. A butt or lap joint on a flat face wants a medium-viscosity fluid that stays where it is dispensed. A joint with a visible fillet requirement, or one with gaps that vary from part to part, wants a thixotropic gel that bridges without slumping. Measure the actual gap on production parts, not the nominal drawing value. Cyanoacrylates bond best across a thin line, often under 0.15 mm, while a gel or a UV-curable acrylate can fill several times that. Viscosity and How It Maps to Grades Incure's Cyro-Weld CM-series spans a wide viscosity range, from thin wicking grades around a few centipoise up to high-viscosity grades in the thousands of centipoise. As a working guide, use the thin grades such as CM-3 or CM-4 for capillary joints already held in alignment, mid-range grades for general assembly where the adhesive is applied before mating, and the high-viscosity grades such as CM-2500 or CM-4000 for vertical surfaces and variable gaps. The 5000-series UV-curable grades follow the same logic but add a cure-on-command benefit: the adhesive will not set until light reaches it, so parts can be positioned and inspected first. Our note on which adhesive cures faster for quick work frames that trade-off. To match a grade to your specific joint and cure method, Email Us with the part drawing and the measured gap range. Cure Path and Fixturing For cyanoacrylate grades, cure speed depends on humidity and gap; thin bonds in a tight joint fixture quickly, while thick sections and low humidity may need an accelerator or simply more dwell time before handling. For UV-curable grades, the light has to reach the bond line. Clear housings let you cure straight through the wall. Opaque assemblies need either a light path along the joint or a shadow-cure mechanism. Small point bonds pair with a UV LED spot lamp; batches of parts run better through a UV cure chamber that surrounds the work with even dose. Design the fixture to hold alignment without masking the bond line from moisture or light, and to locate the same way every cycle so cure dose stays repeatable. Common Grade-Selection Mistakes A handful of recurring errors account for most rework in this area. Choosing a viscosity based on the nominal drawing gap rather than the measured gap on actual production parts is the most frequent one; injection-molded parts…

UV cure acrylic adhesives stay liquid indefinitely and then harden in seconds when the right wavelength of light hits them. That behavior comes directly from their chemistry, and understanding how the cure works is what lets an engineer get a complete, reliable bond rather than a tacky surface over uncured liquid. How the Cure Reaction Works A UV acrylic is a blend of acrylate or methacrylate monomers and oligomers plus a photoinitiator. The photoinitiator is a molecule that absorbs a specific band of UV or violet light and splits into free radicals. Those radicals attack the carbon double bonds in the acrylate groups, and the chains link together in a fast, self-propagating polymerization that converts liquid to solid in one to several seconds under adequate intensity. Because the reaction only starts when light arrives, the adhesive has unlimited open time on the bench. Parts can be placed, adjusted, and inspected, and the bond is locked only when the operator triggers the lamp. Wavelength Matching The photoinitiator absorbs over a defined range. Common systems peak near 365, 385, or 405 nanometers, and some use broadband mercury output. If the lamp's dominant output does not overlap the initiator's absorption, the surface may skin while the bulk stays soft. Match the adhesive to the source before qualifying a process. Our overview of choosing a UV lamp for curing covers the output differences between LED and conventional sources, and Incure's UV LED flood lamp range lists available wavelengths. Oxygen Inhibition and Surface Cure Free-radical acrylics are inhibited by atmospheric oxygen at the exposed surface. Oxygen quenches radicals faster than they can propagate, leaving a thin tacky layer on any face open to air even when the bulk is fully hard. There are three practical fixes: increase intensity at the surface so radical generation outpaces oxygen diffusion, cure in a nitrogen-blanketed zone, or accept the tack layer where it sits inside a closed joint and is not a functional problem. For open fillets that must be tack-free, plan for higher dose or an inerted final pass. If you are seeing a soft surface on an otherwise cured bond, Email Us with your lamp type and the adhesive grade and we will help you close the gap. Depth of Cure and Shrinkage Light is attenuated as it passes through the adhesive, so thick bond lines and pigmented or filled grades cure less at the bottom than at the top. Confirm the maximum cure-through depth for your grade and keep the bond line within it, or use a grade with a secondary heat or moisture cure for the shadowed portion. Acrylics also shrink as they polymerize, typically a few percent by volume. In a rigid, precise assembly that shrinkage can pull parts out of alignment or stress a glass bond. Low-shrinkage and toughened grades reduce the effect. For clear-to-clear work, our comparison of UV glue versus epoxy for transparent bonding discusses the optical consequences. Storage, Shelf Life, and Handling Because the photoinitiator can be triggered by stray…

Choosing a conformal coating is a series of narrowing decisions, not a single pick from a catalog. Work through the service environment, the rework requirement, the electrical demands, and the production process in order, and the field of candidate chemistries collapses to one or two clear options. Step One: Define the Service Environment The environment sets the minimum protection the coating must deliver, so specify it in numbers. Record the humidity range and whether condensation forms, the low and high temperature extremes and how fast the board cycles between them, any exposure to salt fog, fuels, solvents, or process chemicals, and the vibration or mechanical shock the assembly sees. A board in a sealed automotive control module faces thermal cycling and vibration; one on an outdoor telecom tower faces humidity, salt, and wide temperature swings; one in a bench instrument may need only light dust and handling protection. An over-specified coating costs money and complicates rework. An under-specified one fails in warranty. The environmental profile is what keeps the choice honest. Step Two: Decide the Rework Requirement Ask whether any coated board will ever be opened for repair or component replacement. If yes, favor an acrylic, which lifts off with common solvents, or a UV-cure material formulated for localized removal. If no, a cross-linked epoxy or a well-cured urethane gives the toughest, most chemically resistant film, at the cost of being effectively permanent. Silicone sits in between: excellent for wide temperature range and vibration, but messy to rework because it swells rather than dissolves. Step Three: Check the Electrical and Thermal Demands Higher operating voltages benefit from a coating with high dielectric strength, which lets the design hold tighter conductor spacing without arcing. Boards with significant self-heating or components with very different expansion rates need a coating compliant enough not to concentrate stress at solder joints during cycling; the mechanism is the same one described in our guide on how CTE mismatch causes adhesive bond failure. A rigid epoxy over a high-power board can do more harm than good. If you want a second opinion on matching chemistry to environment class, Email Us with the board's service profile. Step Four: Match the Process to the Volume Chemistry and process are linked. Acrylics and silicones dip or spray easily and air-dry or heat-cure. UV-cure coatings need a lamp but remove oven dwell entirely, which suits high-volume automated lines. If your line runs at cadence, an inline UV conveyor or a bank of UV LED flood lamps sized to line speed keeps cure dose consistent. For low volume or prototype work, a brush-applied acrylic may be the practical answer. Mistakes That Undo a Good Selection Even a well-reasoned chemistry choice can underperform if a few common errors slip into the specification. Specifying coating thickness as a single target value rather than a range invites either under-protection at the thin edge of normal process variation or cracking at the thick edge; specify a window instead and control to it. Choosing a coating class…

Adhesives hold together an enormous share of disposable and external medical hardware, from fluid-path connectors and filter housings to wearable sensor enclosures and diagnostic cartridges. For these components, bond strength alone is not the deciding factor. The adhesive and everything it releases during cure or aging must also clear biological safety testing, which shapes both the chemistry you can use and the way you qualify it. What Biological Safety Testing Covers Material safety for device components is evaluated against ISO 10993, a framework that breaks down by contact type and duration. For the externally communicating and surface-contact parts discussed here, the most relevant single test is ISO 10993-5, which screens an extract of the cured material for cytotoxicity, its effect on cultured cells. Sensitization and irritation testing under related parts of the standard follow for skin-contact hardware such as wearable housings. An adhesive supplier can only certify the raw material. Incure's Cyro-Weld CM-series cyanoacrylates and 5000-series UV-curable adhesives are formulated to meet ISO 10993-5, which gives the device maker a documented starting point. The finished device still has to be tested as a whole, because processing, sterilization, and adjacent materials all influence the result. Nothing here supports implantable or long-term tissue-contact use; that is a separate qualification path outside this scope, and no adhesive should be described as FDA-approved. Sterilization Compatibility Most disposable hardware is sterilized after assembly, and the method constrains adhesive choice. Ethylene oxide gas is mild on polymers and works for nearly all cured adhesives. Gamma and electron-beam irradiation can embrittle some chemistries or shift color, so grades intended for that route are validated for a stated dose. Incure lists CM-series and 5000-series grades that are validated for EtO and Gamma sterilization. Steam and dry-heat cycles matter mainly for reusable hardware and put the tightest limit on chemistry. Confirm the specific grade against your sterilization route before committing, and re-test bond strength on sterilized samples rather than assuming the datasheet value holds. The Cure Chemistries in Use UV and visible-light-curable acrylates cure in seconds under a lamp and stay liquid until then, which gives unlimited time to align parts. They suit transparent and translucent housings and connectors, and they pair with focused UV LED spot lamps for point cures or UV LED flood lamps for larger assemblies. Our comparison of UV glue versus epoxy for transparent bonding covers the optical trade-offs. Cyanoacrylates cure in seconds from surface moisture and bond a wide range of plastics with no mixing. Low-viscosity grades wick into tight joints; gel grades bridge gaps. They are common for high-volume disposable assembly. Epoxies and silicones fill out the range where a two-part structural bond or a soft, flexible seal is needed, though cure times are longer. For help matching a chemistry to your substrates and sterilization route, Email Us with the component, the plastics involved, and the contact classification. Documentation to Request From a Supplier Before a grade goes anywhere near a production line, request the underlying test report, not just a one-line claim…

Joining plastic to metal is one of the most common and least forgiving tasks in assembly. The two materials differ in surface energy, stiffness, and thermal expansion, so no single adhesive fits every combination. Matching the chemistry to the specific plastic, load, and environment is what separates a bond that lasts from one that fails in the field. Why the Pairing Is Difficult Three properties work against a plastic-to-metal bond. Surface energy sets whether an adhesive can wet the surface. Metals are usually high-energy and easy to bond. Many plastics are moderate, but polyolefins such as polyethylene and polypropylene sit far too low for an adhesive to grip without pretreatment. Thermal expansion mismatch loads the bond line every time the part heats or cools. A plastic can expand several times as much as the metal it is bonded to, and across repeated cycles that differential shear fatigues the joint. Our guide on how CTE mismatch causes adhesive bond failure explains why a slightly flexible adhesive often outlasts a rigid one here. Contamination finishes the list. Mold-release agents and plasticizers migrate to plastic surfaces, and drawing oils coat metal. Both must come off before bonding. Epoxy Adhesives Two-part epoxies are the default for structural plastic-to-metal joints. They develop high shear strength, resist chemicals, moisture, and heat, and can be formulated with enough toughening to absorb some expansion stress. They bond readily to metals and to higher-energy engineering plastics such as ABS, polycarbonate, and glass-filled nylon. Low-energy plastics still need a primer or surface treatment. Epoxies cure over minutes to hours, which suits parts that need repositioning time but slows a fast line. Cyanoacrylate Adhesives Instant adhesives cure in seconds and come as a single component, so they dispense easily and suit small parts. Rubber-toughened grades add peel and impact resistance that standard cyanoacrylates lack. For difficult plastics, a surface activator or primer is usually required. They are best for fast fixturing and light-duty bonds rather than primary structure. UV-Curable Adhesives Where at least one part is transparent or translucent, a UV-curable adhesive gives unlimited positioning time and then cures on command in seconds under a UV lamp. That makes it strong for bonding clear plastic windows, lenses, and covers to metal frames in consumer electronics and instrumentation. Incure's Uni-Weld UV Glass and Metal Bonder line, with grades such as 1910, 1931, and 2204VT, targets glass and metal, while the Uni-Weld Plastic Bonder range covers polycarbonate, ABS, and acrylic. Our comparison of UV glue versus epoxy for transparent bonding helps decide between the two. Structural Acrylics Two-part methacrylate adhesives combine fast cure, high strength, and impact toughness, and they tolerate lightly contaminated surfaces better than epoxies. They bond a broad range of plastics and metals with minimal preparation, which is why automotive and sign assembly lean on them. The trade-off is odor and a shorter open time. If you are unsure which family fits your substrates and duty cycle, Email Us with the plastic grade, the metal, and the service temperature range.…

As electronic assemblies get denser and power levels climb, moving heat away from junctions becomes a design constraint rather than an afterthought. Thermally conductive materials form the path that carries that heat from the source to a sink or chassis, and choosing the right one directly affects component life and product reliability. Why Heat Removal Drives Reliability Semiconductor life falls sharply as junction temperature rises. A widely used rule of thumb holds that every 10 degree C increase roughly halves the operating life of many electronic components. Power transistors, processors, LED emitters, and voltage regulators all convert part of their input into waste heat, and if that heat is not removed the device runs hotter, drifts out of spec, and ages faster. Thermally conductive materials bridge the microscopic air gaps between mating surfaces. Even two machined faces contact each other across only a small fraction of their apparent area; the rest is air, which is a poor conductor. Filling those gaps with a conductive medium can cut interface thermal resistance by an order of magnitude. The Material Categories Several classes of material serve different points in the heat path. Metals such as aluminum and copper form heat sinks and spreaders. Copper conducts heat better but is heavier and costlier, so aluminum dominates general use while copper appears where space is tight. Ceramics like alumina and aluminum nitride combine reasonable thermal conductivity with high electrical resistance, which makes them useful as substrates and insulating spacers under power devices. Thermal interface materials fill the gap between a component and its sink. Greases and pastes wet surfaces well and give low resistance but can dry out or pump out under thermal cycling. Gap pads are easier to place consistently in high-volume assembly. Phase-change materials soften at operating temperature to improve contact. Thermally conductive adhesives provide a structural bond and a heat path at once, which removes clips and screws from the design. Incure's Epo-Weld thermally conductive epoxy line, including grades such as TC-9033 and TC-9042, is aluminum-filled for this role, while TC-9051 uses an aluminum-nitride filler to stay electrically insulating where the bond must also isolate the part. High-emissivity ceramic coatings shed heat by radiation from hot external surfaces such as manifolds and enclosures; our overview of high-emissive ceramic coatings by substrate and service temperature covers grade selection for that case. Selecting for Your Assembly Define the thermal budget first. Fix the maximum allowable junction or case temperature, subtract the ambient you expect, and the difference sets the total thermal resistance your solution can have from die to air. Then decide whether the interface must also insulate electrically. Many aluminum- and carbon-filled materials conduct current; if the component tab sits at a live potential, you need a filler like aluminum nitride or boron nitride that blocks current while still passing heat. Account for expansion mismatch. A rigid conductive adhesive between materials with very different expansion rates transfers stress into the bond during cycling. The same mechanism described in our guide on how CTE…