1
Dry reinforcement
Glass, carbon, basalt or hybrid fabrics arranged to the ply schedule.
Process engineering guide · China supplier discovery
Vacuum Infusion FRP Manufacturers in China
Vacuum infusion compacts dry reinforcement beneath a sealed bag, then uses the pressure difference to draw liquid resin from an inlet across the laminate toward vacuum outlets. It is widely used for large composite structures where controlled fiber placement and lower open-mold emissions are important.
vacuum infusion manufacturers in Chinavacuum infusion processVARTM composite manufacturingresin infusion FRP
- Geometry
- Large panels and shells
- Reinforcement
- Dry stack
- Driving force
- Vacuum differential
- Tooling
- One-sided plus bag
Process principle
How the vacuum infusion process works
The dry stack must remain leak-tight and permeable enough for a planned resin front to reach every zone before gel. Feed lines, flow media, cores, thickness transitions and vacuum outlets form one flow system.
- 01
Prepare tool
Release and inspect the mold; apply gel coat where part of the specification.
Control: Confirm tool vacuum integrity and surface readiness. - 02
Build dry stack
Place reinforcement, core, inserts and local flow details.
Control: Verify ply book, core seals, splices, thickness and preform mass. - 03
Install flow system
Apply release layer, flow media, feed lines, vacuum lines and bag.
Control: Match the validated inlet/outlet and flow-media plan. - 04
Compact & leak test
Evacuate the bag to compact the stack and confirm vacuum stability.
Control: Record isolation decay and correct every material leak. - 05
Infuse, cure & release
Open controlled feeds, track the resin front, close lines and maintain vacuum through cure.
Control: Record resin state, fill time, front progression, vacuum and cure.
Material system
What enters the process
2
Core & details
Infusion-compatible foam, balsa, inserts and locally sealed features.
3
Infusion resin
Low-viscosity system with a working window matched to flow length and cure.
4
Flow consumables
Release film, distribution media, feed/vacuum manifolds, bag and trap.
Strong process fit
- Wind, marine and transport structures
- Large sandwich panels and shells
- Low-to-medium volume parts with accurate dry-fiber placement
Engineering watch-outs
- Long flow paths and thickness changes require flow trials or simulation
- Bag and core leaks can create hidden dry regions
Buyer audit map
Critical process controls and evidence
A supplier claim is useful only when the process window is tied to the offered material, tooling, drawing revision and production batch.
| Stage | What must be controlled | Evidence to request |
|---|---|---|
| Dry preform | Ply architecture, mass, thickness, core and insert details. | Kitting record and pre-bag inspection. |
| Vacuum integrity | Bag seals, ports, core leakage paths and isolation stability. | Leak-test record with acceptance criterion. |
| Infusion | Resin mix/temperature, inlet sequence, fill time and resin-front path. | Infusion traveler, time log and process photographs or sensors. |
| Cure & release | Vacuum retention, cure and internal laminate quality. | Vacuum/cure trace, thickness map and specified NDT/coupons. |
Defect diagnosis
Common defects, causes and detection
DEFECT 01
Dry zone
Likely cause: Flow shadow, race tracking, premature gel or blocked feed.
Detection: Front monitoring, ultrasound/thermography or representative sections.
DEFECT 02
Porosity
Likely cause: Bag leak, dissolved gas, entrained air or unstable resin feed.
Detection: Vacuum record, ultrasound and microsection where required.
DEFECT 03
Fiber or core movement
Likely cause: High local flow, inadequate stabilization or buoyancy.
Detection: Witness points, dimensional/thickness mapping and imaging.
Typical vacuum infusion applications
Wind turbine blades
Boat hulls and decks
Large panels and roofs
Aerospace and transport structures
Source transparency
Technical references reviewed
This guide uses the JEC process taxonomy, CAMX/ACMA/SAMPE review framework and process-specific material from industry associations, national research centers or government laboratories. Sources explain the process; they do not endorse listed suppliers.
JEC Composites
About composites and manufacturing technologies
Industry-level process taxonomy covering RTM, infusion, pultrusion, winding, fibre placement and additive manufacturing.
CAMX · ACMA & SAMPE
Manufacturing and processing conference resources
Peer-reviewed conference framework for manufacturing, processing, NDE and testing topics.
ACMA CompositesLab
Vacuum infusion processing
Dry stack, flow media, vacuum integrity and resin-front fundamentals.
Reviewed 16 August 2026. Verify current standards editions, material datasheets and project-specific acceptance requirements before award.
REAL REVIEWED DATA
Approved supplier matches
Jiangsu Jiuding New Materials Co., Ltd.Rugao, Jiangsu, ChinaVerifiedProcessFiberglass drawing, modification, weaving and surface treatmentStandardISO 9001MOQ500 kgLead time35 daysJiuding's official English export site describes the business as Jiuding New Material Co., Ltd., formerly Jiangsu Jiuding New Material Co., Ltd. The company states that it was established in 1994 and listed on the Shenzhen Stock Exchange in 2007 under stock code 002201. Its published scope covers fiberglass yarn and fabrics, grinding-wheel reinforcement materials, FRP products, pultruded profiles, gratings, flanges and custom thermoset composite components.
Product categoriesPultruded FRP structural profiles, crossarms, handrails and laddersMolded and pultruded FRP grating, stair treads and trench coversFRP flanges, manholes, elbows and couplingsWebsitejiudingcomposite.com
Techstorm Advanced Material Corporation LimitedShanghai, ChinaProcessFilament windingStandardISO 9001 (company-published factory information; current certificate to be confirmed)MOQNot publicly listedLead timeNot publicly listedTechstorm Advanced Material Corporation Limited is a Shanghai-headquartered developer and manufacturer of high-performance thermoset materials and identifies itself on its official site by Shanghai Stock Exchange code 601026.SH. Its published portfolio spans wind energy, general composites, new-energy vehicles and industrial adhesives, electrical insulation, and photovoltaics. For general composites, Techstorm lists resin systems for filament-wound cylinders, cable core rods and glass- or carbon-fiber wind-blade spar-cap pultrusion, flame-retardant aircraft seating, carbon-fiber prepreg, and HP-RTM or prepreg battery covers.
Product categoriesEpoxy resin systems for filament-wound cylindersPultrusion resin systems for cable core rods and wind-blade spar capsFlame-retardant resin and carbon-fiber prepreg for aircraft seatingWebsitetechstorm.com
AOCNanjing, Jiangsu, ChinaProcessCastingStandardNot publicly listedMOQNot publicly listedLead timeNot publicly listedAOC describes itself as a global supplier of specialty formulations and solutions for conventional composites, coatings and protective barriers, colorants and visual effects, adhesives and specialties. Its Asia-Pacific site publishes Atlac®, Palapreg®, Palatal® and Synolite™ resin products and lists Jinling AOC Formulations Co., Ltd. as its China location in Nanjing, Jiangsu.
Product categoriesUnsaturated polyester resinsVinyl ester resinsSMC/BMC resin systems and low-profile additivesWebsiteaocformulations.com
Noah CompositesHuizhou, Guangdong, ChinaProcessComposite design and engineeringStandardISO 9001MOQNot publicly listedLead timeNot publicly listedAccording to its official company history, Noah Composites began as Jin Hong Company in 2012 and transitioned to an integrated R&D, manufacturing and sales operation in 2016. Based in Huizhou, Guangdong, the company provides OEM/ODM carbon- and glass-fiber composite product development for automotive, watersports, marine, sporting-goods, medical, rescue and other custom applications.
Product categoriesCarbon-fiber automotive partsCarbon-fiber hydrofoils, paddles and watersports equipmentCarbon-fiber marine structures and componentsWebsitenoahcomposites.com
Nanjing Jufa New Material Co., Ltd.Nanjing, Jiangsu, ChinaProcessResin formulation and application development for fiber-reinforced compositesStandardISO 9001MOQNot publicly listedLead timeNot publicly listedFounded in 2018, Nanjing Jufa New Material Co., Ltd. develops polyurethane and polyurethane-modified resin systems for fiber-reinforced composites. Its official website publishes material solutions for pultrusion, filament winding, RTM/vacuum infusion, wet compression molding, SMC and prepreg processing. Through cooperation with Kangda New Materials, the published supply scope also includes epoxy resins and polyurethane, epoxy and acrylic adhesives. Jufa highlights applications including photovoltaic frames and supports, energy-efficient window frames, composite pipe, high-speed rail components, chemical cable trays, wind energy and energy storage.
Product categoriesPolyurethane pultrusion resins, including aliphatic and low-FST systemsPolyurethane filament-winding resinsPolyurethane RTM and vacuum-infusion resinsWebsitejufa-composite.com
Wells Advanced Materials (Shanghai) Co., Ltd.Jiading, Shanghai, ChinaProcessSpecialty formulated and modified epoxy-resin developmentStandardIATF 16949:2016MOQNot publicly listedLead timeNot publicly listedWells Advanced Materials (Shanghai) Co., Ltd. was established in 2010 and focuses on specialty formulated and modified epoxy resins for high-performance composite applications. Its official website identifies wind-turbine blades, electrical and electronic insulation and encapsulation, lightweight transportation, sports and leisure equipment, and new-display materials as core markets, supported by subsidiaries and R&D, production and sales operations in Shanghai, Guangzhou and Zhuhai. The company listed on the Shenzhen Stock Exchange's ChiNext market in 2023 under stock code 301555.
Product categoriesWind-energy epoxy resin systemsVacuum-infusion and hand-lay-up epoxy systemsEpoxy resin systems for pultrusion and RTMWebsitewellswam.com
Chang Zhou Matex Composites Co., Ltd.Changzhou, Jiangsu, ChinaProcessMultiaxial knitting and stitch bondingStandardNot publicly listedMOQNot publicly listedLead timeNot publicly listedChang Zhou Matex Composites Co., Ltd. is a fiberglass-material manufacturer in Changzhou, Jiangsu. Its official site says the company has developed and produced fiberglass textiles, mats and veils since 2007. The published reinforcement portfolio covers knitted fabrics and mats, chopped strand mats, woven reinforcements and veils, with additional roving, chopped-strand, unsaturated-polyester-resin and vinyl-ester-resin ranges. Matex reports approximately 70 employees, a 19,000 m² facility, about 21,000 tonnes of annual fiberglass capacity and exports to more than 30 countries and regions; these scale and export figures are company-published.
Product categoriesUnidirectional, biaxial, triaxial and quadraxial fiberglass fabricsPowder- and emulsion-bonded chopped strand matsWoven roving, woven-roving combo mats and fiberglass clothWebsitematex-frp.com
Changzhou Utek Composite Co., Ltd.Changzhou, Jiangsu, ChinaProcessFiberglass mat and fabric supplyStandardNot publicly listedMOQNot publicly listedLead timeNot publicly listedChangzhou Utek Composite Co., Ltd. is based in Changzhou, Jiangsu. Its official website says the company was established in 2012, initially focusing on fiberglass, resins, SMC and BMC, and now positions the business as an overall composite-material solution provider. Its published catalog spans reinforcements, resins and chemicals, process consumables, core materials and axial fans. The company's China Composites Expo exhibitor listing says it produces powder- and emulsion-bonded chopped-strand mat, stitched mat, combination mat, warp-knitted fabric, core mat and fiberglass cloth, while also supplying alkali-resistant glass fiber, SMC/BMC, gratings and composite geosynthetics. These establishment, production and product-scope statements are company- or expo-published and have not been independently verified by GetFRP.
Product categoriesFiberglass yarns, chopped strands and rovingsChopped-strand, continuous-filament, surface and combination matsFiberglass cloth, stitched multiaxials and unidirectional fabricsWebsiteutekcomposites.com
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Buyer FAQ
It links material lots and ply schedule to resin mix and temperature, leak test, inlet sequence, fill time, resin-front events, vacuum history, cure cycle, final thickness and inspection results.
Resin can move quickly along bag edges, seams or gaps while the main preform fills slowly. The apparent arrival at an outlet may therefore hide a dry region inside the laminate.
For new large or complex geometry, a representative permeability trial, flow study or instrumented first article is prudent before freezing line locations and the production working window.
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