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How to Spec Fuselage and ECS Insulation: What to Send H-O for a Quote
Fuselage and ECS insulation attracts underspecified quote requests because the geometry looks like the whole story: a blanket with a cutout, a duct sleeve, a gasket on a liner. What the quote actually prices is the duty behind it, the thermal target, the acoustic duty, the moisture condition, and how the part installs around structure. This is the ten-item checklist the H-O applications team works from, what engineering does with each item, and what comes back.
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The ten things to send, and what each decides
Fuselage and ECS insulation attracts underspecified RFQs because the geometry looks like the whole story: a blanket with a cutout, a duct sleeve, a gasket on a liner. What the quote actually prices is the duty behind the geometry: the thermal target and bay depth, the acoustic duty, the moisture condition, the flammability framing, and how the part installs around structure.
This is the ten-item checklist the H-O applications team works from for cores, encapsulation films, acoustic plies, spacers, and seals, drawn from the parent application page's own engineering-review list, plus what engineering does with each item and what comes back.
| Send this | What it decides |
|---|---|
| 1. The job: core, encapsulation, acoustic, spacer, or seal | The fundamental split. Cores are judged per ASTM C177 / C518; encapsulation film per ASTM E96 vapor behavior; sponge seals and spacers per ASTM D1056. They are not compared in one column. |
| 2. Thermal target and bay depth | Conventional core or aerogel. A shallow bay or tight duct that cannot reach the target in the available depth moves from polyimide foam to aerogel blanket. |
| 3. Acoustic duty: absorption or mass | Porous core for absorption, a limp-mass barrier ply for mass. Asking the foam to do the mass job is a common miss. |
| 4. Moisture condition of the bay | The duct service temperature and the bay's humidity set the dew point and the moisture layer: encapsulation vapor grade (ASTM E96), seam method, drain geometry, and standoffs. |
| 5. Flammability framing | FAR 25.856 for thermal-acoustic insulation versus FAR 25.853 for interiors. The framing decides which test data the material must carry. |
| 6. Structure to wrap: frame and stiffener layout | Bay-accurate cores that wrap frames rather than bridge them, plus spacer locations, so the package stays continuous on the airplane. |
| 7. Closure force and cycle count at seals | Firmness to the real closure force and compression-set data per ASTM D1056 for cycling pack-bay and access-panel interfaces. |
| 8. Attachment and serviceability | Bonded, laced, hook-and-loop, or removable, each driving a different converted format and the part's drainage and standoff details. |
| 9. Geometry and features: DXF, STEP, or PDF | Footprint, cutouts, drain holes, scallops, standoff pads, and lamination order, the converted features that decide whether the moisture strategy works. |
| 10. Prototype and production volumes | Converting method and price structure. Every part is made to order; prototype quantities through full ship-set production are equally accepted, and MOQ varies by material and part. |
What engineering does with the list
Items 1 through 3 pick the thermal and acoustic layers: a SOLIMIDE polyimide core for the broad area, ArmaGel aerogel or AeroZero film where item 2 says the bay is shallow, and a BISCO A2 sound barrier where item 3 names a mass target. Items 4 through 6 build the moisture and fire layers around them: Kapton or Apical and PTFE-coated fiberglass encapsulation with sealed seams, drain features, and the FAR framing named, plus frame-wrapping geometry.
Items 7 and 8 pick the seals and spacers: cycling BISCO 7xxx FR or kSil V-0 at the pack bay and silicone-foam spacers at the frames. Items 9 and 10 become the converting plan and the price structure.
What happens after you send it
- Drawing review. Engineering reviews the package against the vendor TDS: thermal target and depth, acoustic duty, moisture condition, flammability framing, structure to wrap, and closure forces.
- Material direction and quote. A family and grade direction with the TDS attached, the converted format and moisture features (encapsulation, drains, standoffs, spacers), and pricing at your quantities.
- Samples. Typically 3 to 5 business days for common die-cut configurations on materials we keep on hand.
- Production. Standard runs ship about two weeks after drawing approval, including laminated and kitted ship-set configurations; expedited service is available. Ongoing parts run with material traceability and lot-code TDS records.
Documentation available on request: material technical data sheet, certificate of conformance, and lot traceability, under our ISO 9001:2015 certified quality management system. H-O is a die-cut converter, not a raw-material producer: we do not manufacture the raw foam, blanket, film, or sponge, we do not independently certify them, and FAR 25.856 compliance and airworthiness sign-off belong to the airframer.
The mistakes this checklist prevents
| Spec mistake | What it causes | Checklist item that catches it |
|---|---|---|
| Core sized without the moisture layer | Waterlogged, acoustically dead package | Item 4, moisture condition named |
| Same wrap on a cold ECS supply duct | Duct sweats onto the shelf below | Items 2 and 4, dew point sized |
| Package drawn as a continuous layer | Frames bridge it and stripe the cabin | Item 6, structure to wrap |
| Interiors material in an insulation role | Wrong FAR framing for the part | Item 5, framing named |
| Economy gasket on a cycling pack bay | Compression set, rattles, leaks | Item 7, set per ASTM D1056 |
| Foam asked to be the acoustic mass term | Noise target missed | Item 3, absorption versus mass |
Frequently asked questions
What information do I need to send H-O to quote a fuselage insulation part?
Ten items turn the geometry into a quotable drawing: the job (core, encapsulation, acoustic, spacer, or seal), the thermal target and bay depth, the acoustic duty, the moisture condition of the bay, the flammability framing, the structure to wrap, the closure force and cycle count at seals, the attachment method, the geometry and features as DXF, STEP, or PDF, and the volumes. Send what you have; engineering frames the rest and flags any assumption.
Can H-O cross-reference the material grade on my insulation drawing?
In most cases, yes. If your drawing calls out a core, encapsulation film, acoustic ply, or seal by a brand part number or a FAR or AMS designation, engineering identifies a comparable grade from the lines we convert, matching on thermal transmission per ASTM C177 and C518, vapor behavior per ASTM E96, set per ASTM D1056, and the FAR 25.856 framing the part's role requires. It is an industry cross-reference, not a guaranteed drop-in, verified against the vendor TDS before quoting.
How do I make sure the moisture layer is quoted, not forgotten?
Send item 4: the duct service temperature and the bay's humidity condition. That sets the dew point and tells engineering the part needs an encapsulation film with vapor behavior per ASTM E96, sealed seams, die-cut drain holes and scallops, and standoffs. Without the moisture condition on the drawing, the part is quoted as a thermal object and the moisture features, the things that actually keep it dry, get left off. The moisture layer is specified with the core.
Can H-O supply complete fuselage insulation kits?
Yes. The deliverable that makes ship-set installation repeatable is the kit: every core, encapsulation film, acoustic ply, spacer, and seal die-cut to drawing with its drainage and standoff features, labeled, and packed in installation order, with lot-coded material traceability behind each part. H-O die-cuts, knife-cuts, laminates multi-layer packages, and kits across the families on the parent page as an ISO 9001:2015 certified organization in Winsted, Connecticut.
What lead time should I expect for samples and production?
Every airframe insulation part is made to order, including samples. Samples typically ship in 3 to 5 business days for common die-cut configurations on materials we keep on hand; standard production runs ship about two weeks after drawing approval, including laminated and kitted ship-set configurations; expedited service is available when timing is critical. MOQ varies by material and part, and prototype quantities through full production are equally accepted.
Send the checklist, get an airframe insulation quote
Attach the geometry and as many of the ten items as you have. If something is unknown, say so; the review proceeds with the assumption flagged.
Samples typically ship in 3 to 5 business days for common die-cut configurations on materials we keep on hand; standard production runs about two weeks after drawing approval; expedited service is available. MOQ varies by material and part.
Family-owned in Winsted, Connecticut since 1971 · ISO 9001:2015 certified · OEMs worldwide send us a drawing — and get back their part.
Related reading
Request a quote for your fuselage & ECS thermal insulation part
Send H-O your drawing or describe the part—engineering reviews every RFQ and converts samples on your geometry.
Last updated · Reviewed by H-O Products engineering (ISO 9001:2015 certified converter, Winsted, CT).
References
- ASTM C177 and ASTM C518 (steady-state thermal transmission, the core comparison basis); ASTM E96 (encapsulation vapor behavior).
- ASTM D1056 (compression-deflection and set for sponge seals and spacers).
- FAR 25.856 (thermal-acoustic insulation framing); FAR 25.853 (interiors); FAA AC 25.856 (guidance).
- UL 94 (flammability classes, per grade).
- Manufacturer technical data sheets for the polyimide foam, aerogel blanket, thin polymer film, encapsulation films, sound-barrier ply, and silicone sponge grades named on the parent application page.
This article summarizes insulation material-selection principles for aircraft fuselage and ECS systems using the families and published test methods cited on the parent application page. Comparisons are qualitative; per-grade values quoted are maker-TDS figures and must be confirmed on the manufacturer's current technical data sheet at your thickness, temperature, and installed condition. Standards (FAR, ASTM, UL) are cited by designation for context, not as a claim of qualification.
H-O is a precision die-cut converter, not a raw-material producer, and does not perform thermal design, certify materials, or hold airworthiness approvals; those belong to the airframer and its test houses.