Best I have come across is the American Razor blade.
I cut the PE on a DVD. It is hard enough to take the pressure but does not ruin the blade.
Tiles will ruin the blade edge.
The blade is very thin giving an edge which is sharper than a Morton by a long way.
Being thin enables the blade to cut right up to the edge of the PE. So close that in
the majority of cases I do not have to file clean up at all.
Being a fine edge you can get into extreme corners & nooks. Unlike cutters there
is no danger of damaging the PE. With the razor cut you will end up with a totally
flat PE part.
I offer the blade up to the edge of the PE. Very slight angle so that the V edge of the
razor is vertical to the edge of the PE. Move the blade up & down the edge then meet
the little fixing tab put on light pressure bending the back of the blade down.
Work on the middle between the tabs not at the ends it is more accurate.
For safety I tape one end of the blade up with insulation or plastic tape. Keeps the blood
in the correct place.
If you do have a slight bit of tab you may pare it off by using the same technique above.
Or put in a folder & gently with a diamond file remove the tab. Best file I have found
is the
Tamiya Diamond File 400.
100 of these for £10 last a life time.
Laurie
Find many great new & used options and get the best deals for Single Edge Razor Blades American Line Pack of 100 at the best online prices at eBay! Free delivery for many products!
www.ebay.co.uk