Based what method or concept we have to select the materials?

Collect submittal from supplier of items there are mantion all thinks (eg: pics, approvals certificate, QC certificates,vendor list, awards etc..) after that  we can select materials. 

Based on your organization needs to keep your production run smoothly within the best quality and cost.

based unique as per bussiness orgnization who had to make the search

 

Based on production requirements, quality and service....production team will help you with that, other read the machine catalogue and you will find best product with best quality

The most cost effective choice (considering TCO) of materials which meet the required quality both in materials' and services' quality.