It's 38mm thick.
Next week I will need to cut it along a straight line, and I would like the cut to be as straight and clean as possible.
What tools do I need to do this ?
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You can make straight cuts parallel to an existing edge by using a circular saw with a guide.
To make the bottom edge of the cut clean, be sure the saw does not cut much more deeply than the thickness of the material. You can also put tape on the cut line, before cutting, to prevent the saw from breaking off small pieces of the material on the top edge of the cut.
If you want to rip it (cut it on its long dimension), the only way to be sure it is straight is to use a table saw:
If you want to cross cut it (on its short dimension), you can do that with a miter saw if the piece is not too wide:
If you are confident in your abilities and it does not need to be exactly straight, you can make a line with a chalk line and use a jigsaw with an extremely fine blade (to avoid splintering the wood):
The only way to make this a smooth cut is with a circular saw, either hand held or a table saw. You need a very sharp high tooth count carbide toothed blade. to achieve a smooth cut will require some planning. You need to push the saw through the material at a steady rate as fast as possible without forcing the saw. Make sure you can make the cut in one go. If you stop there will be an imperfection there. Before starting the cut make sure your cord will not get caught as you push the saw through. This is a common error and will create an F-up when the cord stops your forward motion. It is not as hard as it may sound. The main thing is to understand that the best cut comes from a smooth and consistent motion through the cut. Use a guide, and don't push too hard against it. The secret is to find a comfortable way to stand and move through the cut. If you have extra material it is a good idea to practice once or twice.