Construction quality and cleanliness, polysilicon-grade.
The single highest-leverage quality regime in polysilicon construction — specification, enforcement, and on-site presence from mechanical start through pre-commissioning.
The single highest-leverage quality regime in polysilicon construction.
The most expensive mistake a polysilicon owner can make is treating construction quality and cleanliness as a site-team problem. Sub-ppb purity is made or lost during construction — in how a line is welded, how it's pickled, how it's purged, how it's protected between trades, and how it's cleaned before it sees first chemicals. A construction program that ignores any of these will produce a plant that fights its own purity for years. A construction program that takes them seriously will produce a plant that hits qualified output on schedule.
NEXARSiL's construction quality and cleanliness service exists because most EPC organizations are not built to enforce a polysilicon-grade quality regime, and most owner teams don't have the time or the specific experience to do it themselves. We bring the specifications, the inspection regime, and on-site presence to lock in the quality that qualified output depends on.
Nine control areas we specify and inspect.
| Area | Control |
|---|---|
| Weld class | Weld class per line service — polysilicon-contact, TCS, HCl, H₂ — with specific metallurgy and qualification. |
| Weld inspection | 100% orbital weld log, boroscope inspection, weld reject criteria, and repair governance. |
| Pickling & passivation | Pickling specifications, passivation chemistry, post-treatment handling, and documentation. |
| Purge & protection | Inert-gas purge during welding, blind-flange protection during trade gaps, and humidity control. |
| Cleanliness class | Cleanliness class per line service and enforcement regime for all polysilicon-contact piping. |
| Lubricants & sealants | Approved lubricants and sealants list, banned substances register, and verification regime. |
| Line flushes | High-purity flush sequences before first chemicals — water, nitrogen, or solvent as appropriate. |
| Pre-commissioning | Tightness testing, loop checks, and dry-out without compromising cleanliness. |
| Documentation | Cleanliness pack closing every line and every vessel, handed to the commissioning team. |
On-site presence through construction and pre-commissioning.
- Cleanliness specification book issued before mechanical construction starts
- Pre-mobilization training for the EPC and site QA/QC teams
- On-site inspection presence during weld, pickle, purge, and line-flush campaigns
- Weekly non-conformance register reviewed directly with the EPC and owner
- Line-by-line cleanliness pack closing every P&ID item
- Written handover to the commissioning team with full traceability
Questions we often get about this
Can you come in after construction has started?
Yes, but value drops quickly the later you engage. The highest-value entry point is before mechanical construction starts and ideally during EPC selection, so cleanliness is written into the contract, not negotiated later.
Is this service separate from owner's engineering?
It can be engaged standalone or as a sub-scope inside a full owner's engineering program. Most owners who buy full owner's engineering include construction quality and cleanliness inside the scope.
Do you bring your own inspectors to site?
Yes. We bring engineers who have run these regimes at real polysilicon plants, not general QA/QC inspectors unfamiliar with polysilicon cleanliness requirements.
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