FAQ: L-Cysteine

Question 1

What is L-Cysteine?

Accepted Answer

L-Cysteine is a chemical product listing on XCHEMI (https://www.xchemi.com), offered by Improve USA for international B2B procurement. The CAS Registry Number shown on this listing is 52-90-4. Specifications on this page are provided by the supplier; confirm critical attributes before purchase.

Question 2

What is the CAS number for this listing?

Accepted Answer

This XCHEMI product page lists CAS 52-90-4 for L-Cysteine. CAS numbers help align chemical identity across suppliers and regions. Always verify identity, grade, and impurity profile with supplier documentation (e.g., COA) before use in regulated processes.

Question 3

How can I request a quotation or buy L-Cysteine?

Accepted Answer

Use the XCHEMI marketplace actions on this listing (https://www.xchemi.com/product/725249981244218628.html) to contact Improve USA and request a quotation (RFQ). Offer price and currency—when shown—come from the supplier listing and may vary by quantity and shipping terms.

Question 4

What purity, grade, and packaging are listed?

Accepted Answer

See the pricing and specification table on this page for purity, grade, packing, and lot details provided by the supplier.

Question 5

How should chemicals be stored and handled?

Accepted Answer

Follow supplier SDS / label instructions, local regulations, and your site safety program. XCHEMI is a B2B marketplace; obtain current SDS and handling guidance from Improve USA before receipt, storage, or use.

Question 6

What are typical applications for L-Cysteine?

Accepted Answer

Applications depend on industry segment and process requirements. Use this listing as a sourcing lead and validate fitness-for-purpose with Improve USA for your intended use (e.g., synthesis, formulation, manufacturing).

Question 7

Is a safety data sheet (SDS / MSDS) available?

Accepted Answer

Request SDS/MSDS and regulatory documents from Improve USA through XCHEMI quotation or supplier contact. Marketplace summaries do not replace official safety documentation.

Question 8

Who is the seller for this product on XCHEMI?

Accepted Answer

Improve USA is identified as the seller on this listing. You can open the supplier storefront from this page when available to review company profile and other listed chemicals.

L-Cysteine

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