Illustration: a brushed stainless work position with a tray of capped fittings under a flow hood edge

particle control · precision cleaning · clean packing

Clean, measured, sealed

Standards, units and packing: the three things that turn a word into a checkable claim.

Request the cleanliness spec sheet

Verification set · industry practice ISO 16232 / VDA 19.1 / ISO 4406

Leak-rate unit on the report sccm ≈ 1.69×10⁻³ atm·cc/sec

Shelf / service life · per the OCP UQD specification 15 y / 10 y

Why this step sits behind a door

Benchmark practice · entry rule · our wording

Benchmark practice

Couplings of this class are assembled and tested inside semiconductor-grade cleanrooms before they ship. industry practice

Why it matters

A cold-plate microchannel is a particle's direct victim: one shed particle is one blocked channel.

Entry rule

Parts enter the controlled area from the downstream side of the pressure gate. The gate's own numbers stay on the welding page. process capability

Sealed parts only

Already-sealed parts come through the same door; parts that have not passed the gate do not enter. process capability

Our wording

Assembly and packing are carried out in a controlled area, aligned to that practice. process capability

Illustration: fittings spread on a brushed stainless surface beside tweezers and a tray, with no engraving on either

Cleanliness verification

Three standards · one report per batch

ISO 16232

Component technical cleanliness, expressed as particle counts rather than as an adjective.

VDA 19.1

The inspection method that pairs with ISO 16232, so the extraction step is defined too.

ISO 4406

Liquid contamination coding, graded by particle size band.

Report per batch

The cleanliness report is issued against the batch and travels with the parts, so the number can be re-read months later.

Basis

This standard set is the verification practice for precision-cleaned parts. Standard numbers are not certifications. industry practice

Report format is agreed with the receiving quality team before the first batch, not after it.

Illustration: a tray of finished fittings in ordered rows, every end closed with a dust cap

No visible particles. No debris.

Requirement

No visible particles or debris on the delivered part. per the OCP UQD specification

Check

Visual inspection of the delivered surface, filed alongside the per-batch cleanliness report. process capability

Upstream

Two gates sit ahead of this one: pressure on welding & fabrication, leak-rate bands on quality. Neither set of numbers is repeated here.

The unit that goes on the report

sccm · both unit systems accepted

Unit

Leak rate is reported in sccm: standard cubic centimetres per minute, the unit this product class is written in.

Anchor

1 sccm ≈ 1.69×10⁻³ atm·cc/sec.

Two systems

Reports are accepted in sccm or in atm·cc/sec; the conversion is re-checked line by line when the report is reviewed.

Verdict rule

A pass with no unit and no test condition attached is not accepted as data, whichever system it arrives in.

Bands elsewhere

Acceptance bands and instrument sensitivity are set on quality and on the helium leak testing note. This page fixes the unit only.

send your report format → we return the unit mapping

How long the clean state has to hold

Shelf life · service life · held by

Shelf life

15 years in the unopened pack. per the OCP UQD specification

Service life

10 years in service. per the OCP UQD specification

Held by

Storage condition plus the packing barrier. Opening the pack or pulling a dust cap leaves that condition, and the clock changes meaning. process capability

Shelf life · 15 years Sealed, stored, unopened: the pack is the barrier.

Service life · 10 years Connected and in the loop, the interface is what ages.

What holds the clean state in transit

Barrier layers · packing options · destination spec

Dust caps

End caps on both ends of every part, so the sealing face never meets the air of the pack. industry practice

Clean packing

Cleanliness-compatible packing plus a laser traceability mark. industry practice

Barrier options

Barrier bag and desiccant selected per destination and per transit time. industry-typical

Packaging spec

Packing specification is agreed per destination order. One global packing specification is not offered.

Shelf anchor

What the packing has to protect is the 15-year shelf life. per the OCP UQD specification

Illustration: a packing stack pulled apart, with a foam insert, barrier bag, desiccant sachet and capped fittings in trays — Barrier stackFoam · bag · desiccant · tray

Illustration: a clean bench with a fitting under a lit magnifier, lint-free wipes and a capped tray beside it — Wipe-down and look-overBefore the cap goes on

Illustration: a controlled-area entry with an air shower between two gasketed doors — Entry transitionWhere the area begins

Illustration: one controlled work position, a single bench with a tray of fittings — The station in the chainClean assembly

Upstream of this station

Two bays · their values stay on their pages

Precision CNC machining Sealing-face roughness and coaxiality are set here. The values live on that page. Welding & fabrication Joint type and the pressure gate that decides what may enter this area.

This page starts at the exit of that gate and stops where the leak-rate bands begin.

Spec sheet request

What will you check on arrival?

Three things decide acceptance: a cleanliness report per batch, the ISO 16232 / VDA 19.1 / ISO 4406 set it is issued against (industry practice), and a packing specification agreed per destination.

Request the cleanliness spec sheet One business day · English quote + a one-page spec sheet