TDS on raw meterials purcheses ...?

Central Government vide notification No.50-Central Tax-Dated 13-09-2018 & notification No.51-Central Tax-Dated 13-09-2018 has appointed 1st day of October 2018 as the date on which the provision of Sec 51 (TDS) & Sec 52 (TCS) shall come into force. ....

As per section 51(1) , the following class of person shall be required to deduct tax at source @ 2% ( CGST  1% + SGST 1%)  on the payment made or credited to the supplier where the total value of supply under a contract exceed Rs.2,50,000/-excluding GST:

(a) a department or establishment of the Central Government or State Government; or

(b) local authority; or

(c) Governmental agencies; or

(d) Following categories of person has been notified vide Notification No.33/2017-Central Tax Dated 15th Sept 2017 under clause 51(1)(d)

a. an authority or a board or any other body, –

(i) set up by an Act of Parliament or a State Legislature; or

(ii) established by any Government,

with fifty-one percent or more participation by way of equity or control, to carry out any function;

b. society established by the Central Government or the State Government or a Local Authority under the Societies Registration Act, 1860 (21 of 1860);

c. public sector undertakings  .........

So, if you come under the specified trader/catagory........ you will be required to deduct TDS; otherwise not.