Is flubber an example of matter why or why not

Flubber is fake rubber. (It rhymes)

And since it is a solid that takes up space, it is matter.

Flubber is an example of matter because it is a physical substance (solid) that occupies space.

Flubber is a gelatinous rubbery polymer that is produced by cross-linking a boron compound with polyvinyl alcohol (PVA).  

A matter is any physical substance that occupies space and has inertia. Matter is composed of many types of particles that have mass and sizes and it can exist in different states such as solid, liquid and gas.

we can conclude that the melting point of table salt is above room temperature (it's actually 801 deg c). the melting point of mercury must be below room temperature (- 39 deg c).