Which is basically HDPE (plastic) foil with limestone filler. And a whole website full of marketing that somehow never mentions that 20% of the material is non-renewable (made from petroleum products) and not biodegradable.
Yes, they say its HDPE, but then conveniently in all their talk about sustainability, they somehow forget to talk about where HDPE actually comes from. Just that it being composed of carbon and hydrogen somehow makes it "clean". Which, I guess, is something you could also say about things like gasoline. Plastic shopping bags are also made of polyethylene. So are they sustainable as well?
Sure it is. But it's also nowhere near cost competitive and so no one does. They also don't even claim they're using anything else than "normal" HDPE made from ethylene distilled from crude oil.
They don't use "normal" HDPE, they use recycled HDPE which means they don't know what's inside their feedstock and it definitively means you can't get rid of the paper by burning it, because you're also burning whatever mystery chemicals remain inside.
The premise is nice, but downsides noted in another comment, usability is also a problem.
It's much heavier than a normal notebook, and the surface is basically an extremely fine grit sandpaper. It works great with pencils and ballpoints, but wetter pens (gel, rollerball) do not dry as quick. Also, forget fountain pens. You'll be eating away your nib as I write on that paper.
I have a couple of these notebooks, but they sit unused for now.
Limestone itself is not hard enough to wear down metal pen nibs, but "stone paper" does slightly polish them, presumably due to impurities in the limestone: https://www.youtube.com/watch?v=nbqxasFZwsI
The amount of polish is dependent on the tipping alloy of the particular nib.
For example Lamy’s tipping alloy is softer than others, so that polishing becomes excessive to the point of changing nib size. I have an old safari which writes broad after ten years of use (the nib is marked medium).
Pilot and Sailor uses harder tipping alloys. Schmidt is also harder than Lamy, but softer than Japanese counterparts.
(Yes, I have a lot of pens for quite some time :) )
Are you saying you've been using "stone paper" for ten years? Or are you getting this polishing from the sizing agents and random contamination on real paper?
No, I get the polishing from normal, yet high quality paper. Think Rhodia or similar class, not Tomoe River or similar.
I deliberately polished a nib once, on rough brown paper. Not Lamy, but a Pilot Metropolitan.
You can polish a Lamy by regularly using it. It becomes evident in a couple of months, and becomes buttery smooth in a year. No special treatment is necessary.