01: Do the cut edges need sealing and, if so, what with?

Whether or not cut edges would benefit from sealing really comes down to the application and environment where the sheet will be used, specifically, we're really talking about prolonged or permanent exposure to liquids like water, chemicals, oil etc. In an application where the cut edge of the sheet is going to be regularly or permanently exposed to liquids then it would be beneficial to seal the edge to prevent water ingress which, over enough time, can travel down the fibers and cause delamination.

Based on the above, if edge sealing is deemed advantageous then it's best done using some epoxy resin which should be mixed (according to its accompanying instructions) and either be brushed or smeared on the cut edge, or the cut edge dipped in it.

02: What weight can sheet take? Could you walk across it if it covered a hole in the floor?

It's not possible to give an exact weight because it would depend on many things (how the sheet is supported, what the span in, how the weight it loaded, whether the sheet is a 'free span' (i.e. not bonded/fixed) or bonded or fixed (so you get a 'drum skin' effect). That said, you could be confident that a sheet slid over a hole such that the sheet is supported on all sides would support the weight of an average person quite easily.

03: Does the 1mm sheet have a little flex to it?

I'd like to bend it round a slight curve. Are the sheets very brittle?

You can certainly flex the 1mm sheet although it's reasonably stiff and so flexing it will require some force and it will always want to 'spring' back so it would need holding in place once curved.

The sheets are not brittle and are suitable for applications where they need to be bend and held in position (to make a curve) or for applications where they will flex as part of the design.

04: I want to bond this carbon fiber sheet to a sheet of magnesium alloy to create a dual material brace. Could you please recommend a suitable glue to use for this process? It is very important that the final product is lightweight while still rigid and as close as possible to perfectly flat.

It's not clear from your description what size of sheet you're constructing, i.e. whether these are relatively small pieces of bonded material or, potentially, as much as large 2sqm sheets. For smaller bonding operations I would recommend our adhesive; it bonds very well to most alloys and the composite sheet but it has a very short working time of just a few minutes and so is less suitable for larger jobs. In either case, you should prepare the allow by keying it with abrasive and degreasing it with a solvent such as acetone. The adhesive should be thinly spread using a squeegee and the sheets closed together in such a way as to avoid air entrapment. Pressing the sheets during cure or finding some other way to hold them flat will help with the flatness of the finished panel.

05: Does this come with a protective film on the gloss side? And also do you have any sheet that is more of a flat finish instead of gloss?

Yes, this carbon fiber sheet comes with a blue protective film on the gloss side to protect it from scratches during storage and transport.

06: Could you supply 4x160mm diameter discs with a thickness of 3mm please?

I'm afraid that in most situations (unless you need very large quantities) we are unable to supply our carbon fiber sheet either in a custom size or cut-to-drawing. We have produced tutorials and guidance on how to cut carbon fiber sheet yourself but if that isn't an option for your project then we would suggest contacting a company who could cut the sheet for you such as a waterjet cutter or a CNC machinist. Both of these methods can cut carbon fiber sheet quickly and accurately.

07: Are you sheets UV stable? Will the resin go yellowish if left outside?

Our Single sided sheets are resin infused using our own Epoxy Infusion Resin which although it has a high level of UV resistance, is NOT 100% UV stable. This means over several years of UV exposure outside, the resin will eventually begin to yellow. However, in practice, the layer of resin over the carbon fiber on a resin infused sheet is very thin which means minor UV yellowing is not likely to be visible due to the bolder black colour underneath. If 100% is essential for your application then you can spray the sheet in a PU UV stable lacquer to get the protection you need.