1
Cosmetic layer
Optional gel coat selected for appearance and exposure.
Process engineering guide · China supplier discovery
Spray-up FRP Manufacturers in China
FRP spray-up uses a chopper gun to cut continuous glass roving, combine it with catalyzed resin and spray the mixture onto an open mold. Operators then roll the deposited laminate to compact it and remove trapped air, making the method economical for large, moderate-detail parts.
FRP spray-up manufacturers in Chinafiberglass spray-up processchopper gun FRPopen mold fiberglass manufacturer
- Geometry
- Large open-mold shells
- Reinforcement
- Sprayed chopped strand
- Tooling
- Single-sided mold
- Key variable
- Deposition consistency
Process principle
How the frp spray-up process works
The gun meters fiber, resin and catalyst while operator motion sets coverage and local thickness. Rolling and staged buildup are essential because spraying alone does not create a void-free structural laminate.
- 01
Prepare mold
Clean and release the tool; apply and verify gel coat when specified.
Control: Inspect surface, film thickness and cure readiness. - 02
Set chopper gun
Load roving and establish resin, catalyst and glass delivery.
Control: Calibrate outputs and verify spray pattern before production. - 03
Deposit laminate
Spray passes build a controlled layer over the mold surface.
Control: Maintain distance, angle, overlap, coverage and local mass. - 04
Roll & stage
Consolidate each lift and allow controlled staging before added thickness.
Control: Remove air and avoid heat buildup, sagging and fiber wash. - 05
Cure & finish
Complete cure, demold, trim, drill and inspect the part.
Control: Check thickness map, surface, edges, dimensions and repairs.
Material system
What enters the process
2
Spray laminate
Chopped glass deposited with polyester or vinyl ester resin.
3
Local reinforcement
Fabric, core or inserts may be hand-placed in high-load areas.
4
Back surface
Rolled and finished to the agreed workmanship standard.
Strong process fit
- Large covers, shells and bathware
- Moderate production with low-cost tooling
- Parts where one cosmetic face is sufficient
Engineering watch-outs
- Chopped reinforcement limits directional tailoring versus fabrics
- Emissions, overspray and operator consistency require strong controls
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 |
|---|---|---|
| Gun setup | Glass, resin and catalyst output plus chopper condition. | Calibration check and test panel. |
| Deposition | Pass pattern, thickness per lift and fiber/resin distribution. | Traveler, mass usage and wet thickness checks. |
| Consolidation | Rolling coverage, trapped air and staging between lifts. | Operator sign-off and in-process inspection. |
| Release | Cure, thickness distribution, dimensions and appearance. | Thickness map, inspection report and limit sample. |
Defect diagnosis
Common defects, causes and detection
DEFECT 01
Air pockets
Likely cause: Insufficient rolling, excessive lift thickness or difficult corners.
Detection: Visual/tap inspection, backlighting or section samples.
DEFECT 02
Uneven fiber content
Likely cause: Uncalibrated gun, poor motion or unstable roving feed.
Detection: Material usage, burn-off/coupon checks and thickness mapping.
DEFECT 03
Cracking or print-through
Likely cause: Excess exotherm, shrinkage, heavy local buildup or early demold.
Detection: Controlled lighting, cure review and surface standard.
Typical frp spray-up applications
Truck and equipment covers
Marine and sanitary shells
Ducts and tanks
Architectural panels
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
Open molding processes
Association reference for hand lay-up, spray-up and filament winding process fundamentals.
Reviewed 16 August 2026. Verify current standards editions, material datasheets and project-specific acceptance requirements before award.
REAL REVIEWED DATA
Approved supplier matches
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
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
Hebei Tengjun FRP Co., Ltd.Zaoqiang, Hengshui, Hebei, ChinaProcessContinuous pultrusionStandardNot publicly listedMOQNot publicly listedLead timeNot publicly listedHebei Tengjun FRP Co., Ltd.'s official English website describes an integrated FRP business covering product development, design, manufacturing, processing and sales from Zaoqiang County in Hengshui, Hebei. Its current directory spans FRP grating, flat sheet, cable tray, storage tanks, pultruded profiles, manhole covers, marker posts, water tanks, pipes, SMC products, cooling towers and fiberglass rebar. The company states that selected products reach more than 60 countries and regions; this export-market statement is company-published and has not been independently verified by GetFRP.
Product categoriesMolded and pultruded FRP grating, covers and platform componentsPultruded FRP structural profiles, custom sections, ladders and railsFilament-wound FRP storage tanks, pipes and water tanksWebsitetengjunfrp.com
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Buyer FAQ
Both are open-mold routes, but spray-up chops roving and deposits it with resin through a gun. Hand lay-up places discrete mats or fabrics, giving more direct control over orientation and reinforcement architecture.
Calibrate material outputs, define pass patterns and lift limits, track consumption, perform wet checks during deposition and verify a final thickness map at agreed locations.
Ask for gun calibration, material traceability, operator qualification, a representative process panel, laminate composition checks, defect limits and first-article thickness and appearance evidence.
Need current factory evidence and quotations?
Send one controlled specification. GetFRP checks the matching public network without inventing supply records.
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