This is the model developed by Dogma Solutions for the filaments tests performed using the F.E.P. (Filaments Evaluation Protocol)

The "Filaments Evaluation Protocol" (aka “F.E.P.”) has been developed by Dogma Solutions (http://dogmasolutions.com) in order to establish the characteristics and qualities of materials used in FDM/FFF 3D printing.

The protocol is not applied in order to measure the properties of materials, but is instead designed to determine their suitability to specific uses and applications.

For more details, see a brief summary here http://dogmasolutions.com/fep_eng.asp, or download the full white paper here http://www.dogmasolutions.com/public/ContentItems/EN-us.rci_0635626971245350000/FEP_ENG.p.pdf

Other references:

• http://3dprintingindustry.com/2015/04/16/fep-protocol-helps-3dfilo-rate-best-filament-job/
• https://en.wikipedia.org/wiki/Filaments_Evaluation_Protocol