[jonas8732]

100% polyester white fabric is a slightly transparent fabric. Does this fabric provide good protection to prevent plastic and rubber from drying out and breaking in electronic devices?

Is the sunlight that dries out plastic and rubber in electronic devices any light, even indirect light that is deflected and enters homes?

[Borek]

Does this fabric provide good protection

No.

[jonas8732]

because? cotton or polyester fabric is better?

[marquis]

Try widening your search slighly.  Instead of searching for polyester, try searching for the polymer its made of.  This is Polyethylene terephthalate. Its often abbreviated PET or pete.  It can be molded into many shapes. Don't know if it will help, but its worth a try.  Good luck!

[jonas8732]

I don't know of an easy-to-find fabric that is good for protecting the plastic and rubber of devices from drying out

I had read on Google that polyester was good

[marquis]

Why do you think the rubber and plastics are drying out?  What kind of stuff are you seeing?  Thanks.