Thank you Marion, I went direct to technical support earlier today and they advised exactly what you’ve mentioned:
Although the expanded honeycomb foils are thin enough to be cut with sharp shears/scissors, it tends to crush and shred the edges rather than give a neat finish. The neatest finish is to use a fresh Stanley type blade knife with a blade long enough to cut each foil from top to bottom. Use a metal rule and slice each couple of foils in turn working along the metal rule for a straight cut. It might be a bit slow but once you get a rhythm going its not too bad. The blade does need to be very sharp so it slices the foils rather than trying to deform or crush them.
Best regards,
Warren Penalver
Technical Support Assistant