Resin Blending

The best is with empirical experimentation. And different types of blenders varies the outcome.

My guess would be that if V1 and V2 are the characteristics of the two and V is the desired characteristic of the mixtures, then m1 and m2 would be the amounts of resin1 and resin2 to mix together, i.e., a ratio of m1/m2.

m1/m2 = (V2-V)/(V-V1)

In the example above V1=.94, V2=.97, V=.95

m1/m2 = (.97-.95)/(.95-.94) = 2/1 ratio

This assumes that the components blend and don't interact with each other. (If you're mixing epoxy, the resultant mixture would have a lot higher viscosity than either of the components.)

In order- no, yes, no, yes.

For most polymers density can be controlled in an almost linear fashion, providing you are blending compatible and similar molecular weight and structure materials. Carbon black and any other fillers/ additives obviously can be blended in a linear mass ratio.

Izod and melt flow are another story. It depends on the polymer, its processing history if recycled, fillers etc. Blending a high melt flow injection grade unfilled polypropylene copolymer with a low MF extrusion grade 20% glass filled homopolymer is not likely to give you empirical results that fit any formulas I know!

Great details.

I think the anon has totes of either regrind or pellets on hand, from other runs, and wants to magically modify them for use for something else.

In my mind the proportions of fillers/density/MFI/impact is fixed so they would be trying to blend unknown proportions of ingredients (carbon) and physical properties to achieve an impossible material with the desired properties.

This is impossible!

My bet is the OP is from India.

From your question, it appears that you have no idea what density, Izod impact and melt flow index even mean in relation to thermoplastic materials.

What you think you want to do is simply impossible.

Give up this folly because it will not save you any money.Buy the material you need and use it.