Supply Chain Transparency
Every component, sourced and traced.
Utility-scale buyers, ESG-mandated procurement, and bankability due-diligence teams need to know exactly where every gram of silicon, every pane of glass, and every cell comes from. This page is our full bill-of-materials disclosure — plus Xinjiang-free, CBAM-ready, and non-China-origin options.
Bill of Materials Traceability
Every component tier from upstream polysilicon to finished module, with primary sources, alternates for special compliance, and traceability method.
| Component | Primary source | Alternate / Compliance option | Traceability |
|---|---|---|---|
Polysilicon Upstream ISO 14001 refining partners | Chinese mainland tier-1 producers (Xinjiang + outside) | Polysilicon from Qinghai, Inner Mongolia, or imported (Wacker Germany, OCI Korea, Hemlock USA) for Xinjiang-free buyers | Polysilicon lot numbers traceable to mine + refining plant. Xinjiang-free polysilicon certified supply available on request — adds ~$0.005/W. |
Silicon Wafers Wafer SEMI M1 / M44 standards | Own wafer partners + spot market — 182mm and 210mm N-type | Non-China wafers (Vietnam, Taiwan, Korea) available for US-destined or Xinjiang-free projects | Wafer lot ID stamped on string sub-assembly. Traceable back to ingot grower + wafer slicer by LOT-YYWW-XXX format. |
Solar Cells Cell IEC 60904 classification | TOPCon N-type: own supplier partnerships (Jiangsu + Anhui). HJT: in-house + strategic partner | Southeast Asia cells (via SE Asia assembly partnership) for US anti-dumping avoidance | Cell batch IV-curve binned on arrival. Serial-numbered cell-to-module mapping retained for 10+ years. |
Solar Glass (front) Module BOM EN 12150 / ASTM C1048 tempering | Xinyi Solar / Flat Glass / CSG — tempered + anti-reflective coated | Italian or Turkish glass on request for EU-origin compliance | Glass batch tied to lamination lot. Anti-glare / anti-reflective coating verified via in-line optical inspection. |
EVA / POE Encapsulant Module BOM IEC 61215 damp-heat 1000h validated | Hangzhou First / Changzhou Sveck (EVA) · Mitsui / 3M / Hanwha (POE for HJT) | — | Roll lot numbers tracked to lamination station + module SN. Cross-linking degree verified post-cure. |
Backsheet / Rear Glass (dual-glass) Module BOM UL 1703 fire classification | Dual-glass: same glass supplier as front. Backsheet: Cybrid / Jolywood TPT/KPF | — | Backsheet roll lot tied to module SN. For dual-glass, rear tempering performed to same spec as front. |
Junction Box + Diodes Module BOM IEC 62790 J-box standard | Hosiden / Sunjunction / TE Connectivity — IP68 rated, laser-welded | — | J-box lot number bonded to module frame. Bypass diode thermal stress test pre-installation. |
Aluminum Frame Module BOM IEC 61215 mechanical loading 5400 Pa | 6063-T5 or 6005-T6 anodized — Chinese tier-1 extruders | — | Alloy composition certified per batch. Anodization layer ≥15 μm verified. |
Interconnect Ribbon Module BOM IEC 61189 solderability | Ulbrich / Heraeus / Yimi — tin-coated copper, SnPbAg solder-plated | — | Ribbon spec (thickness, width) matched to cell bus-bar count. Pb-free option available. |
Supplier-specific identification (company names beyond tier) available under NDA with PO commitment.
ESG & Compliance Policies
What we commit to, what we audit, and what documentation we provide.
Xinjiang-Free Supply Chain Option
For buyers with US UFLPA or EU due-diligence requirements: we offer a Xinjiang-free pathway with polysilicon sourced from Qinghai, Inner Mongolia, or imported (Wacker DE, OCI KR, Hemlock US). Premium ~$0.005/W. Full CoC (Chain of Custody) documentation provided.
No Forced Labor
JUSTSOLAR and our supplier network comply with ILO fundamental conventions on forced labor, child labor, and freedom of association. Supplier audits conducted annually; non-compliance results in contract termination.
Environmental Management
Our production facilities are ISO 14001 certified. Target >30% renewable electricity for our own manufacturing by 2027 (on track with on-site rooftop solar + grid PPA). Water recycling at ingot-to-wafer partners monitored.
Conflict Minerals
We follow OECD Due Diligence Guidance for Responsible Supply Chains. Tantalum, tin, tungsten, gold (3TG) in junction boxes sourced via smelter-audited suppliers (RMI-aligned).
Carbon Footprint Disclosure
Module-level carbon footprint data available on request: currently 380–420 kgCO₂eq/kWp for China-made modules, 240–280 kgCO₂eq/kWp for Macedonia EU-origin modules. CBAM-ready documentation for EU imports.
Supplier Code of Conduct
All tier-1 and tier-2 suppliers sign our Supplier Code of Conduct covering labor, environment, ethics, and management systems. Available on request under NDA.
Xinjiang-Free / UFLPA-Compliant Option
For US buyers (UFLPA), EU utility PPAs with ESG due diligence, and corporate buyers with supply-chain mandates: we offer a fully Xinjiang-free module pathway.
Also available: Macedonia EU-origin modules (CBAM-compliant, lower carbon footprint) and Southeast Asia-origin modules (AD/CVD avoidance for US market). Talk to us about routing.
Supply Chain FAQ
Can JUSTSOLAR provide a Xinjiang-free supply chain?
What is a Chain of Custody (CoC) document and can you provide one?
What's the module carbon footprint for CBAM / PPA disclosures?
How does JUSTSOLAR handle supplier audits?
Do you offer non-China-origin modules for USA market?
What documentation is in a bankability / DD pack for utility projects?
Request a Supply Chain / Compliance Pack
Tell us your project's ESG mandate — UFLPA, CBAM, corporate ESG, BNEF Tier-1 — and we'll send you the exact documentation you need. For 25 MW+ orders, Chain of Custody is included at no charge.