Overview

An aerospace grade metal gasket for medical devices is shaped by photo chemical etching, which forms seal beads, spring features and bolt holes out of thin 316L stainless, titanium or nickel-alloy sheet in one chemical step instead of by stamping or laser cutting. Dry-film resist is laminated to both faces, the gasket outline and half-etched bead pattern are exposed and developed through high-resolution film, and the unprotected metal is dissolved in a matched etchant, so concentric sealing ridges, locally thinned elastic zones and port openings all form together. Because removal is chemical rather than mechanical, the part stays flat and burr-free with no work hardening, which keeps the material's spring-back and corrosion resistance intact and prevents loose burrs from shedding into a sterile fluid path.

For device and quality engineers, this precision etching process addresses three limits of conventional methods in medical equipment: stamping leaves roll-over burrs and work hardening that weaken compression recovery and can shed particles into fluid lines; laser cutting adds heat tint that hurts cleanability and sterilization resistance; and half-etched seal beads plus elastic relief zones are hard to hold on thin foil with machining. Because the geometry lives in the film, a new part number is only a new artwork, and every gasket on a sheet etches at the same rate, so bead height, sealing-face flatness and spring-back stay consistent from first sample to volume production.

Parameter Window

• Available Materials: 316L/304 stainless steel, grade 1/2 titanium, nickel alloy, copper-beryllium, spring-temper alloys
• Material Thickness Range: 0.05–0.80 mm foil, with half-etched beads and elastic relief zones
• Tolerance: ±0.02 mm on outline and bolt-hole position, ±0.01 mm on bead height
• Minimum Feature: 0.15 mm seal-bead width, half-etch depth 0.02–0.30 mm
• Surface Options: electropolishing, passivation, silver or PTFE coating, cleanroom degreasing and cleaning
• Compliance: ISO 9001 process control, RoHS/REACH material traceability

Manufacturing Process / Workflow (8 Steps)

1. Artwork Review — Convert customer 2D files to vector outlines, check seal-bead width, elastic relief zones and bolt-hole positions against stock thickness.
2. Material Prep — Select 316L, titanium or nickel alloy by sterilization and fluid compatibility, shear to panel size, and inspect the surface.
3. Cleaning & Lamination — Degrease and de-oxidize, then hot-roll dry film onto both faces so no bubbles sit under narrow seal beads.
4. UV Exposure — Expose both sides through high-resolution film with front-to-back registration so beads stay concentric with port openings.
5. Development — Wash away unexposed resist to open the metal to be removed, and rework any bead still showing residual resist.
6. Etching — Spray chemistry matched to the alloy; time, temperature and conveyor speed govern the precision etching process, bead sidewall and half-etch depth across the panel.
7. Stripping & Finishing — Remove resist and neutralize, then electropolish or passivate, apply any coating, and clean for cleanroom handling.
8. Inspection & Packaging — Verify bead profile, hardness, flatness and cleanliness against the approved sample, then pack in clean, particle-free trays with first-article data.

Core Advantages

1. Burr-free sealing faces: Chemical removal leaves no roll-over or loose burrs, so the gasket never scratches the mating flange or sheds particles into fluid lines.
2. Stable compression spring-back: With no work hardening, the alloy keeps its temper and elastic recovery, holding sealing force through repeated clamp cycles.
3. Half-etched seal beads in one pass: Concentric ridges and thinned elastic zones form during the same etch, raising local contact pressure without secondary machining.
4. Flat thin foil, no warpage: No stamping stress keeps thin gaskets flat, so bolt load distributes evenly and the seal seats uniformly.
5. Clean, sterilizable surface: Electropolished and passivated faces resist steam, ETO and chemical sterilization and are easy to clean.
6. Economical multi-spec runs: A new geometry is only a new film, keeping validation samples and varied hospital-device part numbers economical.

Typical Applications

• Infusion pump fluid fittings: Thin 316L gaskets with concentric beads that seal dosing lines without shedding particles into the flow.
• Dialysis machine fluid flanges: Corrosion-resistant gaskets that hold a seal across repeated warm-disinfection cycles.
• Endoscope instrument seals: Miniature titanium gaskets that seal optics and irrigation channels while withstanding repeated sterilization.
• Diagnostic analyzer reagent lines: Beaded gaskets that keep reagent tubing fittings leak-tight against aggressive cleaners.
• Implantable device housings: Biocompatible titanium gaskets used at enclosure joints where long-term sealing and cleanliness matter.
• Imaging equipment cooling loops: Flat gaskets on coolant flanges that hold compression without loosening under thermal cycling.

Design Notes & Process Considerations

1. Bead height versus compression: Match bead height and width to the available clamp load so the ridge yields enough contact pressure without cracking.
2. Spring-back and temper: State the alloy temper and, where needed, annealed condition, since recovery depends on the material's elastic state.
3. Sealing-face finish: Specify flatness and roughness of the mating faces, because burrs or waviness create leak paths at low bolt load.
4. Bolt-hole layout: Distribute holes and clamping force evenly so the bead compresses uniformly around the whole perimeter.
5. Sterilization compatibility: Match material and coating to steam, ETO or chemical sterilization, and confirm no coating flakes under cycling.
6. Cleanliness and drawing data: Define cleanliness, packaging and the full drawing set together; putting bead geometry, temper and finish on the print cuts back-and-forth confirmation.