Body sealing profiles are highly sophisticated in terms of lip forming and overall extrusion process. Especially the introduction of electrical isolating compounds has increased the demands in this area. The work presented in this paper proposes and describes a lab method to get access to the extrudability of compounds by means of lip shaping: the use of a 5-finger die, where the five lips have an increasing degree of difficulty, and also represent the variety of thin profile lips in sealing profiles. The sensitivity of the methodology is demonstrated by applying model compounds derived from ISO 4097 EPDM polymer testing standard. The standard is slightly modified for the curatives and more relevantly for the flow properties in adding a variation of type and amount of white filler into the recipe. On one hand this represents the need of the market for cost effective recipes. But also, the necessity to compound with low carbon black loadings in order to meet electrical isolating properties requires smart compounding with specific fillers. In total, that compounding approach leads to flow characteristics substantially different from conventional compounds, worth to be analyzed. In order to mirror the derived 5-finger die results to other existing methods, frequency sweep investigations by using an RPA on the model compound, a DoE study is conducted. If the 5-finger die results are summarized into a single number (like a cost function) a general correlation to delta-delta or shear thinning of the complex viscosity curve can be demonstrated.