First off, thanks for your extended reply.
I would not put artificial grit that is 78% Aluminium in my tank, no matter if they say it doen't react with water. This is blasting grit, and it is not meant to be constantly under water for years. If you have an acidic enviroment, it could still leak metals, maybe. It would probably also increase your water hardness over time.
Strange enough, Black Diamond and Black Beauty have been used here by many (example BLACK DIAMOND SAND tanks! Let's see them "blasting away" here!!!
). I could not find the exact chemical composition of Black Diamond, but for Black Beauty its:
Silicon Dioxide = 41-53%, Silicon Dioxide- Crystalline "Free Silica" Quartz= <0.1%, Aluminum oxide= 17-25%, Titanium dioxide= 0-2%, Iron Oxide (FeO)= 7-31%, Calcium oxide= 3-15%, Magnesium Oxide= 0-4%, Potassium Oxide= 0-3% and Sodium Oxide= 0.62%.
As you can see, a lot of different metals in pretty high numbers. But no complaints there (yet). If someone knos the chemical composition of Black Diamond that would be great to know.
Blasting grit can have round grains (like the sintershot), or very sharp grains. It all depends on what kind of materials you intend to blast, and what kind of surface you want.
Thats the point. Lots of people want a sand substrate for their cory's, which isn't sharp, but does have a small diameter (less then 1mm). But black "sands" are often very sharp because it's Split, not sand. If Sintershot would be safe, it would be an excellent replacement.
Don't you have any companies in Holland who specialize in taking care of shopping from the US ? They give you an american address (usually on their US facilities) , and you have your products sent to this address. The company then receives the goods and take care of shipping them to you in Europe. I have used this method to buy a Finnex LED aquarium light...it worked perfectly. Most vendors are happy to sell to you as long as you have that american address, even if they know the merchandise is going to be forwarded to an overseas address. Only limitation is goods that are banned from export, or from import into your country. Like guns, prescription drugs and such.
That might be an option, but that would make it (much) more expensive, and adding to that, it wouldn't solve the "problem" for the dutch/european community. IF we can find a substitute similair to Black Diamond or know it's chemical composition then we can find a lasting solution.