EU Supplier of plastic sheets or plastic shim for air-gap in SMPS magnetics

[butech]

Hi,

To build prototypes of SMPS magnetics, I am searching for a supplier of thin plastic sheets or plastic shims with thicknesses of 0.025 mm to 1 mm (best in steps of about 0.025mm) used as a spacer for air-gaps. I am using a mix of different weight papers and/or adhesive tape to manufacture them, but this does not always lead to clearly defined air-gap lengths. E.g., when using paper this will be more or less compressed when manufacturing the parts.

Therefore my question is if anyone knows a supplier of plastic sheets (available in small quantities) in Europe?

Thank you.

[strawberry]

in EU
https://atlantija.lv/?l=lv&menu=about
electrical paper , was ~3eur/m^2 0.2-0.3-0.4-0.5-1.0-2.0 or impregnated ~0.15-...0.4 or PET ... most will withstand 100..155..200C