IndustryAtlasSUPPLY CHAIN HANDBOOK
Read resin formulation, reinforcement and forming together with quality verification. Prepreg, infusion, RTM, pultrusion and winding are alternative process paths rather than a single sequence required for every product.
Fibers provide directional reinforcement; resin transfers loads and holds the structure. Suitable impregnation, consolidation and curing must combine them. Prepreg introduces resin before layup, while infusion and RTM introduce it into dry reinforcement during forming. Pultrusion and winding suit different geometries. Viscosity and working time must match the process, while layup, voids and cure influence quality. One epoxy formulation therefore cannot be assumed suitable for every composite route.
Mixing and degassing prepare the system. Fillers and rheology additives adjust flow or sag resistance, while the cure system determines the reaction window for the intended operation.
Prepreg is laid up and consolidated; dry preforms can use infusion or RTM. Continuous fibers can be pulled into profiles or wound around mandrels, according to geometry and reinforcement direction.
Cure and any required post-cure establish the resin network. Dimensional, visual and internal-defect checks combine with performance validation before a formed part becomes an acceptable deliverable.
Choose routes around geometry: pultrusion for suitable constant sections, winding for appropriate cylindrical structures, and prepreg or liquid molding for shells. Amines and anhydrides are not uniquely tied to individual processes.
Start with epoxy and its cure system, distinguish fibers, fillers and rheology additives, then follow manufacturing routes to material outputs.
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Turn base epoxy into a process-compatible resin system by controlling mixing, viscosity, working time and entrapped air.
Infusion needs flow and wet-out, prepreg needs storage and cure windows, and casting needs bulk-exotherm control. Each requires a suitable formulation.
Distinction: More hardener does not automatically improve cure; use reaction equivalents and product-specific data.
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Amines can crosslink epoxy; their structures and modifications affect reaction rate, viscosity and curing conditions.
They appear in casting, infusion, coatings and pultrusion. Some cure near room temperature, while others require heat.
Distinction: Amines are a chemical family, not a casting-only label; aromatic diamines are only one subset.
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Anhydrides can cure epoxy, commonly with accelerators and heating schedules, serving multiple industrial formulations.
Products exist for pultrusion, winding, electrical casting and impregnation. Reaction windows and final performance govern selection.
Distinction: Maleic anhydride used in BMI synthesis is not interchangeable with every commercial epoxy anhydride hardener.
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Latent systems preserve a usable storage and processing window before reacting or accelerating under selected cure conditions.
Dicyandiamide with suitable accelerators is one option; prepregs also use other curing chemistries.
Distinction: Latency describes reaction behavior; not every prepreg uses DICY.
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Fumed silica can modify epoxy rheology to balance application flow, sag resistance and resistance to settling.
Surface treatment and dispersion affect performance; assess the complete formulation after mixing with the amine hardener.
Distinction: It is not a hardener and differs from reinforcing glass fiber and bulk quartz filler.
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Fillers can modify thermal, mechanical and electrical behavior while also changing viscosity and processing characteristics.
Electrical casting can use prefilled systems; particle size, interfaces, settling and bubbles affect results.
Distinction: Improving one property with filler can reduce flow or wet-out.
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Toughening, dispersion and interface design can improve selected properties when evaluated together with cure and process requirements.
These are optional formulation roles; resin, fiber and process combinations do not all use identical additives.
Distinction: One additive does not automatically deliver high toughness, heat resistance and low viscosity together.
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Structural glass fibers are supplied as rovings, fabrics, mats or chopped fibers selected for processing and resin compatibility.
Pultrusion and winding commonly use continuous rovings; spray-up uses chopped fibers, changing both properties and equipment needs.
Distinction: The existing electronic glass-fabric node serves CCL; it does not cover every structural grade.
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Carbon fibers supply reinforcement, with orientation, textile architecture and interfaces defining structural behavior.
They can enter prepreg, infusion, pultrusion or winding routes; fiber suppliers need not manufacture all downstream parts.
Distinction: Fiber strength does not imply equal finished-part strength in every direction.
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A core between reinforced skins creates a sandwich structure that can balance weight and bending stiffness.
Selection considers resin uptake, compression, temperature and bonding; foams, balsa and honeycombs have different processing needs.
Distinction: Not all composites require cores, and not all cores tolerate the same cure cycle.
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Arrange dry fibers to the required geometry and orientation before infusion or RTM introduces resin.
Permeability, compaction and flow paths affect filling; binders must also be compatible.
Distinction: A dry preform is not equivalent to prepreg containing a preselected resin matrix.
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Tools define geometry and withstand processing conditions, requiring compatibility with materials, thermal cycles and dimensional targets.
Tool surfaces, vacuum sealing and thermal expansion affect release and quality; tooling supply differs from part manufacturing.
Distinction: One tool is not automatically suitable for hand lay-up, RTM and pressurized autoclave curing.
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Consumables provide sealing, evacuation, release and resin-flow functions, selected for prepreg or infusion processing.
Bag film, sealant, release materials, breathers and flow media have distinct roles; no process necessarily uses all of them.
Distinction: A vacuum bag is neither matrix resin nor reinforcing fiber.
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Combine fiber with a resin system in advance, then use controlled resin content, lay-up and curing to manufacture structural parts.
Epoxy prepregs can use autoclave, oven or press curing depending on grade, with product-specific storage and out-time limits.
Distinction: Structural prepreg differs from PCB bonding prepreg, and not every grade needs an autoclave.
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Laid-up prepreg cures with a vacuum bag and controlled external pressure and temperature to produce low-void structural parts.
Pressure, heating, resin flow and cure timing must align; vessel capacity, batch cycles and energy use affect production.
Distinction: An autoclave is equipment and a curing route, not a hardener or a medical steam-sterilization recipe.
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Prepreg designed for out-of-autoclave curing can produce qualified structures using vacuum bagging and an oven.
Air evacuation and impregnation follow material design; an autoclave grade cannot simply be switched to lower pressure. This node focuses on vacuum-bag oven curing.
Distinction: OOA is a broader family of non-autoclave processes, not just this oven route.
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Equipment lays prepreg tape or fiber to designed orientations, improving repeatability in complex lay-ups.
Material width, tack and geometry must suit the process, followed by compatible consolidation and curing.
Distinction: AFP and ATL are placement technologies, not separate curing chemistries.
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Place a compatible prepreg, molding compound or wet charge into matched dies and apply pressure and heat to form the part.
Control flow, fiber displacement, filling and cycle time. Epoxy can use dedicated fast-curing prepreg; other resins also use SMC/BMC routes.
Distinction: Not every SMC/BMC is epoxy, and press molding is not autoclave curing.
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Place reinforcement on a mold, apply liquid resin, wet out and consolidate successive plies, then cure the selected system.
It has comparatively modest equipment requirements; resin content, orientation and consistency matter, with optional vacuum-bag consolidation.
Distinction: Wet lay-up impregnates fibers before bagging, unlike dry lay-up followed by infusion.
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Vacuum bags compact a lay-up through pressure difference and aid air removal, supporting wet lay-up, prepreg and heated curing.
This is a consolidation arrangement used across processes; vacuum quality and leak control affect results.
Distinction: A vacuum bag does not necessarily imply resin infusion or autoclave external pressure.
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Lay dry reinforcement and any core into the tool, then use a vacuum-generated pressure difference to introduce resin and wet out the fibers.
Viscosity, working time, permeability and flow-path design determine whether filling completes before gelation.
Distinction: This differs from bagging an already wet laminate; low viscosity does not mean unlimited infusion time.
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Place a dry reinforcement preform in a closed tool, inject resin and cure to control geometry and both surfaces.
High-pressure RTM is one variant; mixing, injection, fiber movement and cure speed must be designed together.
Distinction: RTM and vacuum infusion share resin-flow principles but differ in tooling and pressure arrangements.
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Continuous fibers are impregnated and pulled through a shaping die to manufacture profiles or flat strips.
Epoxy can use anhydride or amine systems; open baths and injection boxes impose different working-time, fast-cure and pulling requirements.
Distinction: Anhydride is not the only pultrusion option, and other resin families can also be pultruded.
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Wind resin-impregnated continuous fiber around a mandrel at designed angles to form pipes, shells or pressure-vessel structures.
Wet winding can use a resin bath, while towpreg routes also exist. Tension, angles and subsequent curing affect load capacity.
Distinction: Producing a cylindrical shape does not establish pressure-vessel qualification.
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Continuous production forms profiles or strips that are cut, joined and integrated into structures as required.
Suitable designs include industrial structures and wind-blade spar caps; fiber orientation and joints govern load transfer.
Distinction: A pultruded carbon strip is a blade input, not an entire wind blade.
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Fill a mold or the space around components with a liquid epoxy system and cure it into a casting or encapsulant.
Both amine and anhydride routes exist. Thick sections require exotherm, void, shrinkage and thermal-gradient control, with optional fillers and vacuum assistance.
Distinction: Neat-resin castings are not automatically fiber composites; filled systems form a separate particulate-composite route.
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Epoxy, curing systems and fillers can form insulating castings or encapsulants for motors and electrical components.
Validate insulation, thermal cycling, cracking and process defects; fillers do not improve every property simultaneously.
Distinction: This filled-polymer electrical route is distinct from structural fiber laminates.
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Equipment chops continuous glass fiber and sprays it with resin into a mold, followed by rolling to consolidate the reinforced layer.
Common commercial routes use resins such as unsaturated polyester; epoxy requires verified metering, mixing and equipment compatibility.
Distinction: This differs from spraying an epoxy coating without reinforcing fibers onto a surface.
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Spray a compatible epoxy formulation onto a substrate or mold for protective, surface or gelcoat functions.
Amine cure with fumed silica is one rheology option; atomization, leveling, sag resistance and working time must remain compatible.
Distinction: Adding fumed silica does not guarantee sprayability or turn a coating into a continuous-fiber structural composite.
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Curing forms the polymer network; some products require post-curing to achieve specified performance and dimensional stability.
Cure can occur in a mold, pultrusion die, oven or autoclave. This node groups process control, not a mandatory separate machine.
Distinction: A hard surface does not prove adequate cure, glass-transition temperature or internal quality.
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Check appearance, dimensions, internal defects and material performance to turn a manufacturable specimen into a qualified deliverable.
Ultrasonics can inspect suitable structures for porosity and delamination; methods, calibration and acceptance criteria depend on geometry and use.
Distinction: A single inspection method does not establish every chemical, thermal and mechanical requirement.
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Laminate or sandwich designs form shells and panels for qualified blade, marine or airframe applications.
One resin family can support multiple processes; geometry, loads, maintenance and qualification determine the choice.
Distinction: A process name does not certify a final application.
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