Is solver the right way?

[chrissharma]

Hi everyone,

I'm new to this forum and also pretty new to excel. That is, when it comes to more complicated stuff.

The thing is working with a certain product that has several properties. My goal is to improve one of those properties by lowering the value. In the sheet this is know as thermal conductivity.
The other property is bending strength. Both bending strength and thermal conductivity are related to porosity. The porosity can't be lower too high so the bending strength will be lower than 2.5

My question is if anybody has any idea about how to work with this?
I've formulated the constraints in the sheet in the attachment.
Someone told me to use solver, but thus far haven't been able to figure it out.
I had one idea, which was joining a forum regarding excel, which I successfully executed

Any thoughts are welcome.

Thanks in advanced