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 {{ :en:rex310_en_082.svg?nolink&700 |}} {{ :en:rex310_en_082.svg?nolink&700 |}}
  
 +For amorphous materials, the enthalpy value at $T_g$ must be calculated as solid enthalpy $∆h_F$ (in case of doubt, linear interpolation of the enthalpy values of the neighbouring measured values).
 +
 +==== Thermal conductivity ====
 +For amorphous or semi-crystalline materials, the following thermal conductivity curves over temperature result:
 +
 +{{ :en:rex310_en_083.svg?nolink&700 |}}
 +
 +{{ :en:rex310_en_084.svg?nolink&700 |}}
 +
 +These curves also show significant changes in the characteristic temperatures $Tg$ and $Tk$. To evaluate the material data, the characteristic temperature must again be determined and a linear regression must be performed in the range $T$ >> $Tg$ and $Tk$ using the following equation: 
 +
 +$$λ(T) = λ_0 + λ_m \cdot T$$
 +
 +===== Density =====
 +Density measurements are generally performed at constant temperature and varying pressures. However, to evaluate the densities, it is necessary to plot them at constant pressures and varying temperatures. Here, too, the curves for amorphous and semi-crystalline polymers differ.
 +
 +  * partially crystalline polymers
 +
 +{{ :en:rex310_en_085.svg?nolink&700 |}}
 +
 +  * amorphous polymers
 +
 +{{ :en:rex310_en_086.svg?nolink&700 |}}
 +
 +Depending on whether density or specific volume was measured, a linear regression must be performed using one of the functions listed below: 
 +
 +Specific volume:
 +
 +$$v = v_0 + v_m \cdot T$$
 +
 +Density:
 +
 +$$ρ = ρ_0 - ρ_m \cdot T$$
 +
 +where: 
 +
 +$$ρ = \frac{1}{v}$$
 +
 +For the evaluation, a pressure must be selected from the list of available pressures.
 +
 +Description of pressure dependence:
 +
 +Kappa:
 +
 +$$ \kappa = - \frac{1}{V} \frac{dV}{dp} $$
 +
 +==== Technological data ====
 +Minimum, maximum and average particle diameters as well as shear stress are data that must all be entered manually. No calculation is performed.
 +
 +==== Tribological data ====
 +For further calculations with the REX / PSI / SIGMA programmes, various friction coefficients of the materials must be specified.