[MW:19949] How sample do we required for Do Galvanized Material to test

Dear All.
I have to test the Galavanized material as per IS code , My
material description is given below,

Round bars - Dia 40 mm -- 250 nos.
Flat - 50x6mm ---120 nos ,
Flat - 200 x 10 - 2 nos.

So please inform me how many sample should i take to test the
Uniformity of coating , Mass of Zinc Coating , and others

Regards
Vijay

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