Hi Sreedhar,
If this is only one time activity and if you required the material master data from different tables then you can use one of below two methods
1: Create a simple Z report with required field and then download the report to excel.
2: Ddownloading table in excel and user v-look up in excel.
If you required material master regularly from SAP To Non-SAP then you can make use of RFC/IDOC, methods which can is use for communication between two systems.
Regards,
Zafar