Aim for Greater Availability

Once the performance requirements are established, the material availability should be considered with a bias toward greater availability as feasible.  Small quantities might be readily available for R&D activities, so any major red flags might not emerge during development, but that does not guarantee production quantities will not have long lead times.  This is an important question to ask, and not one that comes to mind when everyone is in a state of relief that they finally found something that works.  Availability is a risk, so add it to the checklist for selecting materials and backups.

And be sure to review material availability regularly because availability can change over time.  If a backup material has not been ordered for years, and it is suddenly needed, it might not be as available as it once was.

Evaluate Long Term Costs Over Time

Cost is another question worth asking early.  Yes, everyone eventually asks the question, but sometimes it doesn’t come up during the development phase when quantities are small and the focus is on urgently finding a solution that just works.  If a material works perfectly but is far too expensive to offer a feasible solution, was it worth the effort to test at all or would the resources have been better spent testing more affordable solutions?

Generalize Requirements, Don’t Specify

The selected material should also tend toward generalizing the requirements as possible rather than toward more specific requirements.  If the requirements specify both material grade and manufacturer, but the manufacturer discontinues the grade or encounters a disruption in the supply, qualifying a backup can cause expensive delays.

Leaving out the manufacturer allows the sourcing from multiple suppliers as necessary.  Specifying a material grade and one or two backup grades is another good way to reduce such risks later.  In some instances, specifying the grade is not necessary.  When a generic ABS would suffice, specifying the grade can introduce unnecessary delays and expenses.

Consider Ease of Processing

Another thing to remember is that different materials, and even material grades, can have different injection molding process windows for the same part in the same mold.  Some materials are more challenging to run, and introduce new processing risks.

With all else being equal tend toward easier-to-process resins.  This requires asking the right questions at the right time.

Should Be Attractive

Material should be pleasing to eyes it should not very dramatic and fizzy. also material which are very common should be avoided such as wallpapers, it is something which is very commonly use. If you want to stand out of crowd you need to use some unique material. People shold ask you; from where you got this material?