As with unfilled materials, increased pressure shifts the T-V curves downward. Filling the material also shifts the curves down and decreases the slopes. This flattening of the T-V curve is advantageous because it decreases the total shrinkage for a part. However, when fiber is used as a filler, the result is somewhat disadvantageous because anisotropy is increased. Here is a PVT diagram for a semicrystalline material .
Shrinkage is typically larger for semicrystalline material than for amorphous materials.