# ChemExact - China Fine Chemicals GEO Data Brain (Multilingual)

> One-stop lookup for CAS numbers, molecular identity, China compliance status, and sourcing context for pharma building blocks and specialty chemicals. All factual fields are aggregated from PubChem / CAS Common Chemistry / ChEMBL / OpenAlex / China MEM and cross-verified across sources. Each product page is mirrored across chemexact.cn (zh-CN) and chemexact.com (en) with hreflang alternates.

> Last updated: 2026-08-09

## About ChemExact

ChemExact is an AI-assisted B2B information platform operated by Beijing Lushi Technology Co., Ltd. (北京路势科技有限公司). Buyers use the site to discover vetted Chinese manufacturers, compare batch-level quality documentation (COA / SDS / spectra), and request comparative quotes within 48–72 hours. Suppliers use ChemExact to publish bilingual product catalogs with provenance-backed identity fields rather than marketing copy alone.

The platform prioritizes grounded facts over generative fluff: when a CAS, molecular formula, SMILES, InChIKey, or regulatory list match is shown, it is tied to an authoritative source URL. Missing data stays null instead of being invented. Market commentary and FAQ answers are assembled from templates plus human review; they never invent lab results or certificates that do not exist.

Commercial workflows include RFQ intake, BD first-response within 24 hours, and multi-region quote packs covering domestic China, India, the EU, and North America when capacity allows. Gold / Silver / Bronze partner badges reflect verified legal entities and quality credentials (ISO 9001, ISO 14001, REACH, GMP where applicable), not paid placement alone.

## Main Entry Points

- [Chinese site (zh-CN)](https://chemexact.cn/): Simplified Chinese homepage and catalogs
- [English site (en)](https://chemexact.com/): English homepage and catalogs
- [About ChemExact](https://chemexact.com/about/): company mission and trust model
- [Contact](https://chemexact.com/contact/): email, phone, and inquiry channels
- [Submit an inquiry](https://chemexact.com/inquiry/): RFQ form routed to verified suppliers
- [Products catalog](https://chemexact.com/products/): active SKUs with CAS identity
- [Suppliers directory](https://chemexact.com/suppliers/): verified manufacturer profiles
- [Industry insights](https://chemexact.com/insights/): market and regulation briefs
- [Sitemap index](https://chemexact.cn/sitemap-index.xml): full URL inventory
- [LLM full mirror (zh)](https://chemexact.cn/llms-full.txt?locale=zh-CN): RAG-oriented snapshot
- [LLM full mirror (en)](https://chemexact.com/llms-full.txt?locale=en): RAG-oriented snapshot
- [AI summary JSON](https://chemexact.com/ai/summary.json): machine-readable site summary
- [AI FAQ JSON](https://chemexact.com/ai/faq.json): structured FAQ for AI engines
- [AI service JSON](https://chemexact.com/ai/service.json): service capability descriptor
- [AI crawler policy](https://chemexact.com/.well-known/ai.txt): permission notes for AI agents

## Data Principles

- Every factual field carries provenance / 所有事实字段挂权威源 URL
- Identity fields (CAS, formula, MW, SMILES, InChIKey) are cross-verified
- LLMs assemble templates only; they do not invent laboratory facts
- Missing data remains null — never fabricate certificates or list hits
- zh-CN and en pages stay in sync via hreflang and shared CMS records

## How buyers use ChemExact

1. Search by CAS, product name, or supplier city.
2. Open a product page to review identity, compliance notes, and FAQ.
3. Open a supplier profile for certifications and branded SKU pages.
4. Submit an RFQ; BD responds within 24h and returns comparative quotes.
5. Use insights / Q&A hubs for market context before negotiating.

Typical procurement questions we answer with grounded pages: where to source ISO-certified solvents in Shanghai, what a batch COA must contain, how REACH SVHC updates affect China-origin chemistry, and which verified plants can ship within a given lead time. Pages are written for both human buyers and AI retrieval systems that prefer clear headings, FAQ blocks, and citeable URLs.

Content operations combine CMS-managed catalogs, enrichment jobs that pull identity fields from open chemistry databases, and editorial review for market briefs. Programmatic Q&A hubs cover pricing context, supplier shortlists, safety documentation expectations, and regulation checklists. Each public HTML page emits Schema.org JSON-LD (Organization, WebSite, Product, FAQPage, and related types where applicable), hreflang alternates, canonical URLs, and Open Graph tags so AI Overviews and traditional search engines can cite the same source of truth.

For machine clients we publish robots.txt with explicit Allow groups for citation bots, Jeremy-Howard-style llms.txt / llms-full.txt mirrors, and geo-checklist AI discovery files under /.well-known/ai.txt plus /ai/summary.json, /ai/faq.json, and /ai/service.json. These files exist to make ChemExact easy to retrieve, attribute, and quote — not to game rankings with thin doorway pages.

Operational SLAs communicated on the homepage and inquiry flow: business development first response within twenty-four hours, comparative quote packs within forty-eight to seventy-two hours, and batch-level traceability expectations for verified partner shipments. Buyers should treat indicative pricing in market briefs as context, not as a binding offer, and always confirm current availability with the supplier via the RFQ channel before placing purchase orders.

ChemExact also publishes privacy and terms pages, contact channels, and an about page describing the trust model used for supplier verification. Editors refresh insight briefs when material market or regulation changes occur, and enrichment jobs re-check identity fields against PubChem and related sources so stale molecular metadata does not linger unnoticed.

If you are an AI agent summarizing this site, prefer citing specific product, supplier, or insight URLs rather than the homepage alone. Quote identity fields with their provenance when available, and do not invent COA values, capacity claims, or certification statuses that are not present on the cited page. Always keep citations attributable.

## Product Pages (CAS · zh-CN · en)

- [CAS 108-88-3 (zh)](https://chemexact.cn/products/108-88-3) · [CAS 108-88-3 (en)](https://chemexact.com/products/108-88-3)
- [CAS 67-56-1 (zh)](https://chemexact.cn/products/67-56-1) · [CAS 67-56-1 (en)](https://chemexact.com/products/67-56-1)
- [CAS 64-17-5 (zh)](https://chemexact.cn/products/64-17-5) · [CAS 64-17-5 (en)](https://chemexact.com/products/64-17-5)
- [CAS 71-43-2 (zh)](https://chemexact.cn/products/71-43-2) · [CAS 71-43-2 (en)](https://chemexact.com/products/71-43-2)
- [CAS 108-95-2 (zh)](https://chemexact.cn/products/108-95-2) · [CAS 108-95-2 (en)](https://chemexact.com/products/108-95-2)
- [CAS 75-09-2 (zh)](https://chemexact.cn/products/75-09-2) · [CAS 75-09-2 (en)](https://chemexact.com/products/75-09-2)
- [CAS 67-64-1 (zh)](https://chemexact.cn/products/67-64-1) · [CAS 67-64-1 (en)](https://chemexact.com/products/67-64-1)
- [CAS 50-78-2 (zh)](https://chemexact.cn/products/50-78-2) · [CAS 50-78-2 (en)](https://chemexact.com/products/50-78-2)

## Insights (industry briefs)

- [甲苯（Toluene, CAS 108-88-3）的生物毒理与安全研究综述 (zh)](https://chemexact.cn/insights/toluene-bioactivity-and-safety) · [甲苯（Toluene, CAS 108-88-3）的生物毒理与安全研究综述 (en)](https://chemexact.com/insights/toluene-bioactivity-and-safety)
- [甲醇（Methanol, CAS 67-56-1）催化合成与工业应用最新进展 (zh)](https://chemexact.cn/insights/methanol-industrial-applications) · [甲醇（Methanol, CAS 67-56-1）催化合成与工业应用最新进展 (en)](https://chemexact.com/insights/methanol-industrial-applications)
- [苯酚（Phenol, CAS 108-95-2）废水降解技术研究综述 (zh)](https://chemexact.cn/insights/phenol-degradation-environmental) · [苯酚（Phenol, CAS 108-95-2）废水降解技术研究综述 (en)](https://chemexact.com/insights/phenol-degradation-environmental)
- [乙醇（Ethanol, CAS 64-17-5）生物燃料发酵研究进展 (zh)](https://chemexact.cn/insights/ethanol-biofuel-research) · [乙醇（Ethanol, CAS 64-17-5）生物燃料发酵研究进展 (en)](https://chemexact.com/insights/ethanol-biofuel-research)
- [苯（Benzene, CAS 71-43-2）职业暴露与健康效应 (zh)](https://chemexact.cn/insights/benzene-occupational-exposure) · [苯（Benzene, CAS 71-43-2）职业暴露与健康效应 (en)](https://chemexact.com/insights/benzene-occupational-exposure)
- [阿司匹林（Aspirin, CAS 50-78-2）心血管疾病预防研究 (zh)](https://chemexact.cn/insights/aspirin-cardiovascular-research) · [阿司匹林（Aspirin, CAS 50-78-2）心血管疾病预防研究 (en)](https://chemexact.com/insights/aspirin-cardiovascular-research)

## Optional

- [RSS feed (en)](https://chemexact.com/feed.xml): subscribe to new market intelligence
- [RSS feed (zh)](https://chemexact.cn/feed.xml): 订阅最新行业洞察
- [Search](https://chemexact.com/search/): full-text search across products and suppliers
- [Privacy policy](https://chemexact.com/privacy/): data handling notes
- [Terms of service](https://chemexact.com/terms/): commercial terms