Aerospace Injection Molding — Molds & Molded Parts from a Technically-Led Factory
We tool and mold the large aerospace parts that fail in ordinary tooling: thin-wall PC covers, long brackets, and interior trim where a sink, a warp, or a weld line on a textured face means rejection. Our founder has led the tooling floor for 20+ years and still owns every hard technical decision.
Aerospace covers, brackets and interior trim built to a zero-sink cosmetic standard
Proven in PC and PEEK on SPI/VDI-textured Class-A faces — not just data sheets
Founder-led tooling floor — engineers own the steel decisions, not a sales desk
ISO 9001 with full CMM traceability; DFM, Moldflow and trial reports on every job
What Aerospace Injection Molding Really Demands — and Where Parts Fail
Aerospace plastic injection molding looks like commodity molding until you load a thin-wall PC cover or a fiber-filled bracket. High-performance resins such as PEEK and Ultem (PEI) melt at 340–400°C, inside a narrow window between full melt and thermal degradation. Miss it, and the batch is scrap. The harder problems show up after the part ejects — and they decide whether your program ships.
Sink Marks on PC Cosmetic Covers
Thick ribs and bosses behind a visible face cool slower than the skin. As the core solidifies, the surface pulls inward. On a cosmetic cover, zero sink is the spec, not a target. We resolve it at the gate and cooling layout before any steel is cut.
Warpage on Long, Thin-Wall Structures
Long, slender parts shrink anisotropically. Flow-induced stress and uneven cooling bow the part off datum, tolerances drift, and assemblies stop fitting. Balanced fill and cooling decide whether the part holds form across a full run.
Undercuts & SPI/VDI-Textured Surfaces Without Weld Lines
Internal undercuts need lifters or sliders that still protect a SPI/VDI-textured face. A weld line crossing a textured surface is visible and rejectable. Gate position and fill simulation keep the knit line out of the cosmetic zone.
Designing the tool around these failure modes is the difference between a part that ships and one that loops back through T1 — and it starts long before you choose plastic over metal.
You can send your part drawing right now and get preliminary DFM feedback within 12 hours.
Send Your Part Drawing — Get Free DFM FeedbackWhy Aerospace Chooses Injection-Molded Plastics
Replacing aluminum brackets and metal housings with molded polymers cuts mass where every gram affects fuel burn. The advantages of aerospace plastic injection molding reach past weight alone:
Lightweighting
Molded polymers replace machined metal at a fraction of the mass, with no secondary machining.
Part Consolidation
Clips, ribs and bosses combine into one shot, cutting fastener count and assembly labor.
Repeatable Volume
Once the tool is validated, every cavity delivers the same part.
Gas-Assist Molding
Gas-assist molding hollows the heavy areas, drops part weight and material cost, and keeps the surface flat.
Those gains only hold when the right process is matched to your part.
Our Aerospace Injection Molding Processes
Most aerospace covers and brackets need more than a standard single-shot tool. The geometry forces decisions early: where the gate sits, how a metal boss is anchored, how you cut wall thickness without losing stiffness. We build tooling for four process types and run the ones we don't own through long-term molding partners with the right machines on the floor.
Insert Molding for Aerospace Parts
We over-mold threaded brass and stainless inserts into housings and brackets so fasteners hold under vibration. The insert is fixtured before the shot, not pressed in after, which removes a secondary station and the stress cracks that follow it.
/insert-molding/Two-Shot (2K) Molding
For sealed enclosures and soft-touch trim, our partner runs dedicated two-shot (2K) machines that bond a rigid substrate to a TPE gasket in one cycle, leaving no glue line to fail in service.
/2k-molding/Gas-Assist Molding for Lightweighting
Thick handle sections and structural ribs sink and warp. Gas-assist equipment hollows the core, cutting weight and resin while holding the outer surface flat.
/gas-assist-molding/Process is only half the equation. The resin and the mold steel decide whether the part survives the program.
Aerospace-Grade Materials & Mold Steels
Material choice on an aerospace job is two decisions, not one: the resin that meets the operating envelope, and the mold steel that survives the resin. Abrasive glass and carbon-filled grades chew through soft cavities, so we match steel hardness to filler load before cutting a single electrode.
Resins we mold for aerospace components — injection-molded high-performance polymers:
Mold steels we cut:
We finish high-gloss S136 cavities on a Sodick mirror EDM, which is what makes a Class-A PC cover possible without secondary polishing marks.
Knowing the resin and the steel is one thing. Proving we've cut your exact part type is another.
Components & Applications We've Produced
Our aerospace work sits in non-flight-critical, often large or cosmetic territory — the parts where weight, surface finish, and part consolidation drive the program. Injection molding for aerospace components at KTM has covered five recurring categories:
Door and Window Housings
Long, slim bodies with internal undercuts and VDI-textured faces that allow zero visible sink
Structural Brackets and Supports
Fastener-anchored parts that replace machined aluminum
Interior Trim
Bezels, panels and seat-back components where weight reduction lifts fuel efficiency
Electrical Enclosures
Housings that shield avionics while adding minimal mass
Ducting and Ventilation Parts
Sections that hold geometry through thermal cycling
Most run 1*2, 1*1 or 1+1 cavity tools, sized for the moderate volumes typical of cabin and structural aerospace.
If your part lives in one of these families, the next question is usually commercial: do you want the tool, or the parts?
Two Ways to Work With Us
Aerospace programs split into two procurement camps: teams that own presses, and teams that need parts shipped ready to assemble. We build the aerospace injection mold to suit either.
Mold Export
What you get
Tooling shipped to your floor for in-house molding
Best for
Buyers with their own presses and material control
In-House Molding
What you get
We keep the tool and supply finished plastic parts
Best for
Buyers without molding capacity or with lower volumes
Pre-Export Trial Run
What you get
De-risking first articles before they leave China
Best for
A documented 2,000-piece production run before the tool ships
That trial run proves the tool makes stable parts, not just first-shot samples. Once a path fits your program, the next question is how fast you reach first articles.
Need a transparent quote? Send your STEP file and project details — we'll reply with specified steel, cavity count and process plan.
Request a Transparent QuoteFrom Aerospace Prototype to Production
Most aerospace parts start at low volume and scale once the design locks. We carry your geometry across that gap without re-validating the material. For early-stage work before hard tooling is justified, we run:
CNC Machining
Functional parts in the same resin grade you'll mold later, plastic or metal
3D Printing
Fast form-and-fit checks on bracket and housing geometry
Vacuum Casting
Short runs of cosmetic covers for fit reviews
Prototype Mold
Low-volume parts in economy steel with a path to production
When volumes justify the tool, aerospace prototype injection molding moves into hard-steel production on the same part data, so dimensions and material behavior carry forward instead of restarting.
That continuity cuts qualification time on covers, brackets and trim. Scaling cleanly only holds if the shop has the tonnage to mold large parts.
Tonnage & Equipment for Large Parts
Large aerospace covers and structural brackets need press capacity beyond most general shops. As an aerospace injection molding company, we run 40 in-house presses from 90T to 400T, with partner capacity scaling to 3,300T for oversized parts.
Molding Floor
FANUC, Haitian, LOG injection machines, all fitted with robotic part removal for 24-hour unattended runs
Partner Presses
450, 600, 800, 1,000, 1,300, 1,600, 2,100 and 3,300T dedicated 2K (two-shot) / 3K (three shot) and gas-assist equipment
On-Site Inspection
CMM, optical projector, pin gauges, plug gauges, micrometers, and steel hardness testers
Robotic handling keeps cycle-to-cycle output consistent across long runs, which matters when a single warped cover fails the lot. Stable presses set the floor; the real proof lives in the parts we've already shipped.
Aerospace Injection Molding Case Studies
Numbers tell the real story. Below are four desensitized programs we've run for aerospace covers, brackets and trim — the parts where a generic quote ignores the sink, warpage, or demolding risk that decides the job. This is what best aerospace injection molding practice looks like in the toolroom.
Case 1 — Door-window housing
Steel: S136
Resin: PC
Surface: VDI-textured, cosmetic
Cavity: 1*1
Challenge: Long thin-wall body with an internal undercut, on a show face that allows zero sink
Solution: Lifter-actuated undercut release; gate and cooling layout tuned in DFM; mirror-EDM cavity finish
Result: Zero sink on the cosmetic face, undercut released clean across the run
Case 2 — Structural bracket (mold exported)
Steel: H13
Resin: PC
Surface: Matte
Cavity: 1*2
Challenge: Balanced fill across both cavities on a tool shipped for the customer's own presses
Solution: Runner balancing verified at trial before export; process sheet shipped with the tool
Result: Both cavities held part weight and dimensions on the customer's floor
Case 3 — Ducting / air-management bracket (mold exported)
Steel: 1.2344
Resin: PEEK
Surface: Functional, non-cosmetic
Cavity: 1+1
Challenge: Holding dimensional stability on a part that sees thermal cycling, where PEEK's heat resistance is the reason it was specified over commodity resin
Solution: Cooling layout sized to wall thickness; shrink compensated in steel after Moldflow
Result: Dimensions held through thermal conditioning; tool exported with full trial documentation
Case 4 — Cover (export with pre-shipment trial)
Steel: H13
Resin: PC
Surface: Cosmetic
Cavity: 1+1
Challenge: Proving production stability before the tool left China
Solution: Documented 2,000-piece trial run with dimensional records
Result: First articles validated; tool shipped with trial and CMM reports
Each part carried a risk a catalog quote skips — which is exactly why the inspection and document trail behind them matters.
Why Choose KTM
You're not buying a brochure. You're buying access to engineers who control every variable that turns a drawing into a part that holds — and who fix it when something moves at T1. That control runs as one documented loop, not a final inspection bolted on at the end. This is the difference between a vendor and an aerospace injection molding solutions partner.
DFM Report
Preliminary feedback at quote stage, full report after order, flagging sink-prone bosses, undercuts, thin-wall fill paths and shrink before steel is cut
Moldflow
Run on complex or thin-wall parts where fill and warpage are real risks
Mold Trial Report
T1 setting sheet, trial video and shot photos, recorded shot-by-shot
Dimensional Verification
CMM reports and optical projector, backed by pin gauges, plug gauges, micrometers, height gauges and a steel hardness tester
Material Certificates
Resin and mold-steel traceability on file
Founder-Led Engineering
Because the founder has run the technical floor for 20+ years and still owns the hard engineering calls, problems get solved by the person who designed the tool — not relayed through a sales desk.
Room-temperature inspection alone won't qualify a part, so dimensions tie back to the drawing's functional callouts, not a generic checklist.
Behind that sit an 80-person factory, ISO 9001 traceability, and customers who've stayed 15, 10 and 6 years, with the project team online to 8:00 p.m. local time to close the gap with U.S. and European time zones.
Every claim above ties back to a document you can audit. The questions engineers ask before sending a drawing are answered inside.
Aerospace Injection Molding FAQ
Do you have AS9100 for these parts?
For the parts we make — covers, brackets, interior trim and electrical housings — AS9100 is not required, and our customers haven't asked for it. These are non-flight-critical components, not assembled aircraft. We run ISO 9001 plus full traceable documentation, which is what actually controls quality on this work. We'll tell you plainly when a job sits outside our capability.
Can you mold large cosmetic parts without sink marks?
Yes — Case 1 above is a PC cosmetic housing built to a zero-sink standard. We control wall transitions, gate location and cooling layout in DFM, then confirm on the trial report before cutting steel further. Where geometry is severe, gas-assist molding solves heavy-wall sink at its source.
What materials do you run most for aerospace?
The resins our customers run most for aerospace work are PC and PEEK, and both are materials we know well. PEEK demands tight melt control in the 340–400°C range; PC carries most of our cosmetic-cover work. If your part calls for another resin — Ultem (PEI), PPS, Torlon (PAI), or a filled grade — send the spec and FST requirement, and we'll work with it.
What does DFM actually change on my part?
Early DFM flags sink-prone bosses, undercuts, thin-wall fill paths and shrink before tooling starts. It cuts trial iterations and scrap. You get preliminary feedback at quote stage and a full report after order.
Will the price change halfway through the project?
Not on our side. We quote transparently with specified steel (H13/1.2343/1.2344/S136, or the steel you specify) and no hidden fees. If you change the part structure or requirements mid-project, we talk it through before the next step — and if that change affects cost, you hear it from us first, in writing. No silent up-charges.
Mold export or in-house molding?
Both. We ship the tool for your own presses, or keep it here and supply molded parts. See the two-models section above for how each works.
Straight answers shorten your evaluation. When you're ready, here's the fastest way to put a real drawing in front of our engineers.
Send Your Drawing — Get Free Preliminary DFM Feedback
Aerospace injection molding companies should answer engineers fast. Send your part and our engineers reply within 12 hours.
Request DFM Feedback
What Happens Next
Submit your part drawing with project details
Our engineers review your geometry within 12 hours
You receive preliminary DFM feedback identifying sink risks, undercuts and wall-thickness concerns
A transparent quote follows with specified steel, cavity count and process plan