EPS Foam Design and Production

Hi gents and ladies,

I am facing an issue about the EPS (expended polystyrene) fire retardant product.

First, the product is designed according to EPS expansion ratio 30 (general density is 0.033 g/cm3).
The CAD software is giving me the total weight 0.8 gram (using density 0.033 g/cm3).
The specified weight tolerance range is 0.84~0.76 gram.

If the injected EPS product is giving me 1.2 gram.

Questions:
1. Does it mean that the expansion ratio of the injected product is not 30 anymore?
2. Does it affect the product mechanical properties (strength and thermal resistance)?
3. If I specify the "expansion ratio 30" and "weight range 1.9~2.1 gram" in the drawing. Which one would drive the final result?

Really need your help and advice.
Thanks.

Freshmen