Missile, UAV & Weapons System Materials

Microcellular urethane is the workhorse: PORON ShockSeal 4790-79 is the dedicated shock-pad grade, the 4790-92 slow-rebound grades absorb impact energy rather than bouncing it back, and the 4701 series covers firmness-graded cushioning and gasketing. Closed-cell vinyl nitrile and BISCO silicone foams serve larger liners and wide-temperature duty. The selection logic is energy management at controlled stiffness: size the pad so its working strain sits inside the grade's documented compression-force-deflection range with travel to spare.

Foam properties are tested per ASTM D3574; values are per the TDS on file. Programs commonly evaluate the finished assembly against MIL-STD-810 derived requirements, and that qualification belongs to the equipment test, not the material claim. [4]

By conduction, in two steps. First a flexible graphite spreader (SpreaderShield class) flattens the hot spot: graphite's in-plane conductivity far exceeds its through-plane value, so heat moves sideways out of the die footprint into a larger area. Then a compliant interface hands the heat to the chassis or skin: a compressible graphite TIM (eGRAF HiTherm) where electrical conduction is acceptable, or an insulating silicone TIM (Sil-Pad class, Gap-Pad class fillers) where the path must also isolate.

Thermal impedance is compared per ASTM D5470 on the TDS at stated pressures. H-O die-cuts the whole stack to the board geometry, kiss-cut on liner for assembly. [5]

A radome gasket seals the perimeter of an RF-transparent window, radar aperture, antenna fairing, sensor dome, against rain, dust, and altitude, without changing the electrical behavior of the aperture. That requires an electrically non-conductive material: closed-cell BISCO silicone sponge for low closure force on thin composite walls, kSil V-0 where the program wants UL 94 V-0 documentation on the gasket, fluorosilicone sponge where fuel or fluids wash the joint, and solid silicone for bolted flanges.

A conductive EMI gasket in this location is a specification error: it puts a conductive ring around the aperture. Conductive shielding selection lives on the aerospace EMI shielding page. [7]

SOLIMIDE polyimide foam is the aerospace default for large-area, weight-critical compartment insulation: its density classes are a fraction of conventional elastomer foams (per grade TDS), with thermal data per ASTM C518, acoustic data per ASTM C423, and ASTM E595 outgassing screening on the AC-series TDS. Nomex aramid paper adds a tough dielectric wrap for harnesses and bay walls.

Beside genuinely hot faces, exhaust-adjacent structure, heater banks, the inorganic step takes over: mica sheet and Pyrogel XTE aerogel blanket. Say on the drawing whether the exposure is continuous or event-only; the answer changes the family. [10]

Specify ShockSeal 4790-79 when the pad's primary job is the shock event: it is the dedicated shock grade, combining energy absorption with a sealing function in one die-cut part, with foam data per ASTM D3574 on its TDS. Specify the 4701 series when the job is everyday cushioning, vibration damping, or gasketing at a chosen firmness: 4701-30 very soft through 4701-60 very firm, picked so the working strain lands in the grade's documented range.

The 4790-92 extra-soft slow-rebound grades sit between: impact energy absorption where envelope is generous. The wrong move is treating thickness as the design variable; the grade's compression-force-deflection curve is. [8]

No, and no sheet material does. MIL-STD-810 is an environmental engineering and laboratory test-method standard applied to equipment by a program: the program derives its tailored test profiles, runs them on the assembled unit, and the qualification belongs to that unit. Materials support the result but are not themselves '810 rated.' The honest material story is the TDS: foam data per ASTM D3574, thermal impedance per ASTM D5470, outgassing screening per ASTM E595, flammability per UL 94, each reported per grade.

H-O's pages cite military standards by designation only and frame materials as commonly evaluated to program-derived requirements. [1]

Yes. Conductive elastomer EMI gaskets, including families whose TDS carry MIL-DTL-83528 designations and QPL listings, conductive fabric-over-foam, and foil tapes are covered in depth on the dedicated EMI shielding gaskets for aerospace & defense page, with MIL-STD-461 derived requirements framed by designation.

The reason this page separates them is practical: on RF-aperture hardware the conductive and non-conductive gasket families must never substitute for one another, so the two selections are documented on two pages with two callout vocabularies.

Where one enclosure needs both, engineering reviews the pair at quote so each seam carries the right part number. [3]

Specify grades whose TDS reports ASTM E595 screening, the total-mass-loss and collected-volatile-condensables test developed for space hardware and widely used wherever condensable films threaten optics. On this page's families, E595 data on the PORON TDS shows 4701-50, 4701-60 and AquaPro within the TML <1% / CVCM <0.1% screening limits, while 4701-30 and the 4790-92 slow-rebound grades exceed them; SOLIMIDE AC-series and PMD foams report TML <1.0% / CVCM <0.1%.

Keep the reported values with the order file rather than quoting them from memory, and treat truly vacuum-exposed duty as its own problem: the spacecraft & launch vehicle materials page covers that framing in depth. [6]

Thin enough that the limit is usually handling, not cutting: the SpreaderShield and HiTherm lines include gauges down to fractions of a millimeter per their TDS designations, and H-O die-cuts them to board-level geometries with webs, tabs, and adhesive backings as the drawing requires.

Two practical notes from the converting side: first, thin graphite is delicate in free sheet, so kiss-cut-on-liner formats protect the part through assembly; second, graphite is electrically conductive, so cut-outs and clearances around exposed conductors must be designed in, not assumed.

Thermal impedance per ASTM D5470 and gauge designations are per the TDS on file. [9]

H-O operates an ISO 9001:2015 certified quality management system and ships converted parts with material traceability, lot-code TDS records, and certificates of conformance to the purchase-order requirements. Source manufacturers' TDS and compliance statements (UL 94 listings, ASTM test reports, REACH / RoHS statements where published) travel with the material.

H-O does not claim equipment qualifications, flight certifications, or registrations it does not hold; program-specific compliance, documentation, and handling requirements should be raised at quote so engineering can confirm scope before the order is placed.

No. H-O is a precision converter: we die-cut, kiss-cut, slit, and laminate engineered sheet materials, foams, films, papers, elastomers, graphite, into parts built to your drawing. We advise on material selection at the level this page covers (cushioning, thermal, sealing, insulation properties and their TDS documentation), and we stay out of weapons-system design, integration, and performance entirely.

That boundary keeps the engagement clean: you own the design and its qualification; we own dimensional conformance, material traceability, and converting quality on the parts we ship.

The drawing (DXF, STEP, or PDF) or a sample part, plus the duty context: cushion, thermal, aperture-seal, or insulation role; the environment (bench, transport, high-shock, hot-adjacent); any electrical requirement (insulating vs conductive); the weight budget if it is tight; and the documentation lines your program will request (UL 94 class, E595 screening, traceability records). Every part is made to order; sample and production lead times are listed in the process strip above and confirmed with your quote through the form below.

Often, yes, as a lamination rather than a single material. H-O builds multi-layer die-cut assemblies where each layer carries its own documented property: a PORON cushion bonded to a graphite spreader, an inorganic hot-face (mica, ManniGlas) backed by silicone foam, or a gasket with an integral stiffener and pull tab. The discipline is that every layer keeps its own TDS story, so the part's documentation stays auditable.

What a lamination cannot do is make one chemistry do another's job: an insulator does not become conductive, and a hot-face rating does not transfer to the backer. Send the stack-up intent and engineering will propose the lamination and its records.