Semiconductor process gases are measured against parts-per-trillion contamination budgets, and the fittings that carry them are engineered accordingly. If your facility supports fab construction, gas yards, or sub-fab utilities, here's the vocabulary and the hardware that ultra-high-purity (UHP) service demands.

VCR: The Metal-Seal Standard

VCR-style face seal fittings seal by compressing a metal gasket between two polished glands — no elastomer, no thread lubricant, no particle-shedding surfaces in the gas path. That gives leak rates in the 10^-9 std cc/sec helium range and full bake-out capability. Gaskets are single-use: nickel for general UHP service, 316L stainless for corrosive gases, copper for specific duties. Sizes run 1/4" through 1" face seal, with male/female glands, nuts, and a full ecosystem of valves and regulators built around the interface.

Electropolished 316L Tubing

UHP gas lines use 316L tubing with controlled sulfur chemistry, electropolished interiors specified by Ra — commonly 10 µin for high-purity and 5–7 µin EP for UHP — and orbital welding rather than mechanical joints wherever possible. Tubing arrives cleaned, purged, and double-bagged; it stays capped and bagged until the moment of installation. For utility and slurry services around the fab, standard sanitary and instrumentation-grade components apply instead — matching the purity level to the service keeps costs sane.

Handling Rules That Protect Purity

Open UHP components only in the cleanroom or a purged environment; never reuse metal gaskets; keep tools dedicated and degreased; purge lines with certified gas during and after work; and document every joint — fabs require weld maps, material certs, and cleanliness certifications in the turnover package.

Where Standard Industrial Hardware Fits

A fab is mostly not UHP: cooling water, CDA, vacuum, slurry, waste, and CMP support systems run on the industrial hose, 316 fittings, tri-clamp hardware, and gasketing we stock every day. Splitting the BOM correctly between UHP-spec and industrial-spec components is one of the fastest ways to pull cost out of a fab utility package.

Quoting Fab Utility Packages

Send your line list or component spec — sizes, materials, finish requirements, quantities — through the quote form at the top of this page. Our team prices industrial and high-purity supply packages with documentation, replying in 1–2 business hours.