The flexible plastic cases are the best mainly because the rubber is a better absorber of shock then the hard plastic cases. The plastic covers are only good to make your phone look different they in fact supply very little protection.
most commonly plastic or flexible silicone
A rubber or plastic spatula might not be able to stand the intensity of heat as much as a silicone one would be able to. Silicone is very heat resistant and won't melt like plastic would.
Plastic is lighter.Steel has no real benefits over the best types of plastic which will be just as durable.
Most plastic wristbands are created out of silicone rubber in factories, most of which are in Asia. Silicone rubber is placed into a mold, and solidifies. The mold would have the proper design which would then be passed on to the silicone rubber.
Depends of the plastic, but generally rubber is more flexible. However, SOME plastics are very flexible.
100 % silicone.
A hundred years ago, you'd have used a strip of flexible leather for this task. Today, one might use a flexible plastic material, such as polycarbonate, or a silicone. You have a wide choice of material today.
yes
no the vans water and stain shield does have any silicone or plastic products in it
Silicone, hard plastic, metal, glass
Depends on the kind of plastic, but try 100% clear silicone. It's good with many plastics. ( but in future ,please be more specific, - 'plastic' covers hundreds of different compounds.
Silicone in a tube or caulk would do it well.