SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM 6-K

REPORT OF FOREIGN PRIVATE ISSUER PURSUANT TO RULE 13A-16
OR 15D-16 OF THE SECURITIES EXCHANGE ACT OF 1934

For the month of September, 2021

(Commission File No. 1-14862 )

BRASKEM S.A.

(Exact Name as Specified in its Charter)

N/A

(Translation of registrant's name into English)

Rua Eteno, 1561, Polo Petroquimico de Camacari
Camacari, Bahia - CEP 42810-000 Brazil

(Address of principal executive offices)

Indicate by check mark whether the registrant files or will file annual reports under cover Form 20-F or Form 40-F.

Form 20-F ___X___       Form 40-F ______

Indicate by check mark if the registrant is submitting the Form 6-K
in paper as permitted by Regulation S-T Rule 101(b)(1). _____

Indicate by check mark if the registrant is submitting the Form 6-K
in paper as permitted by Regulation S-T Rule 101(b)(7). _____

Indicate by check mark whether the registrant by furnishing the information contained in this Form is also thereby furnishing the information to the Commission pursuant to Rule 12g3-2(b) under the Securities Exchange Act of 1934.

Yes ______       No ___X___

If "Yes" is marked, indicate below the file number assigned to the registrant in connection with Rule 12g3-2(b): 82- _____.

NOTICE TO THE MARKET

São Paulo, September 28, 2021 - Braskem S.A. ("Braskem" or "Company"), (B3: BRKM3, BRKM5 and BRKM6; NYSE: BAK; LATIBEX: XBRK), continuing the Notice to the Market disclosed on March 1, 2021, hereby informs its shareholders and the market that on September 27, 2021, Braskem Idesa (“BI”), a subsidiary of Braskem Netherlands B.V., signed the following documents:

(i) Amendment to the ethane supply agreement (“Amendment”) with PEMEX Transformación Industrial and PEMEX Exploración y Producción (“PEMEX”) with settlement of previously existing contractual pending issues;

(ii) Agreement with Petróleos Mexicanos, PEMEX Logística and other government entities, establishing the support measures to the project to build an ethane import terminal with the capacity to meet all of BI's feedstock requirements ("Terminal Agreement”).

The Amendment changes the minimum volume commitment to 30,000 barrels per day until the earliest of: (i) the operational startup of the ethane import terminal, scheduled for the second semester of 2024, or (ii) February 2025 (which could be extended if there are delays in obtaining licenses). The Amendment also gives BI the preemptive right to acquire all the ethane that PEMEX has available and has not consumed in its own production process until 2045, at international benchmark prices.

It is worth noting that the terminal project is designed to complement the ethane supply in Mexico and enables BI to operate at full capacity by accessing new feedstock sources.

To take effect, the Amendment and Terminal Agreement are subject to applicable corporate approvals, including final approval from the shareholders and creditors of BI. Additionally, investments in the terminal are subject to final approvals by the competent BI’s governance bodies and its shareholders.

At the moment, BI cannot predict the outcome of discussions with its shareholders and creditors. The Company will keep the market informed of relevant developments, in accordance with applicable laws.

For more information, contact Braskem’s Investor Relations Department by calling +55 (11) 3576-9531 or sending an e-mail to braskem-ri@braskem.com.br.

SIGNATURES

        Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned, thereunto duly authorized.

Date: September 28, 2021

DISCLAIMER ON FORWARD-LOOKING STATEMENTS

This report on Form 6-K may contain forward-looking statements within the meaning of the Private Securities Litigation Reform Act of 1995. These statements are statements that are not historical facts, and are based on our management’s current view and estimates of future economic and other circumstances, industry conditions, company performance and financial results, including any potential or projected impact of the geological event in Alagoas and related legal proceedings and of COVID-19 on our business, financial condition and operating results. The words “anticipates,” “believes,” “estimates,” “expects,” “plans” and similar expressions, as they relate to the company, are intended to identify forward-looking statements. Statements regarding the potential outcome of legal and administrative proceedings, the implementation of principal operating and financing strategies and capital expenditure plans, the direction of future operations and the factors or trends affecting our financial condition, liquidity or results of operations are examples of forward-looking statements. Such statements reflect the current views of our management and are subject to a number of risks and uncertainties, many of which are outside of the our control. There is no guarantee that the expected events, trends or results will actually occur. The statements are based on many assumptions and factors, including general economic and market conditions, industry conditions, and operating factors. Any changes in such assumptions or factors, including the projected impact of the geological event in Alagoas and related legal proceedings and the unprecedented impact of COVID-19 pandemic on our business, employees, service providers, stockholders, investors and other stakeholders, could cause actual results to differ materially from current expectations. Please refer to our annual report on Form 20-F for the year ended December 31, 2019 filed with the SEC, as well as any subsequent filings made by us pursuant to the Exchange Act, each of which is available on the SEC’s website (www.sec.gov), for a full discussion of the risks and other factors that may impact any forward-looking statements in this presentation.