Word to describe things that have a tendency to melt?

Things that can catch fire are called inflammable, similarly I want to know the word which describes things like wax or ice which melts as soon as temperature around them rises.

Thanks.

For example sentence let us agree that the word is 'meltable' but it does not satisfy my need.

Example- May be brotherhood is too 'meltable' to survive even couple of days under debris of burned buildings!!

Meltable:

• capable of melting.

The Free Dictionary

Thermally unstable solid

Quoting from the book Guidelines for safe handling of of powders and bulk solids

Many unstable solids start to decompose as a result of a small heat input, e.g., friction. ...

Deliquescent means "becoming liquid or having the tendency to become liquid" (here). Liquescent means the same thing.

You could use both of these words to describe butter or ice, but I am not sure about wax.

Fusible means "capable of being fused or melted easily" (here), but seems to be used largely for metals.

I also like @Josh61's suggestion of meltable. Although this might not mean, according to dictionary entries, easily or readily meltable, I'm sure a lot of people use it to mean this.