Real wash beach sand has round granuals and cannot be used for concrete construction. The MSDS says that this sand is suitable for concrete work.
Information given here is conflicting

As per the manufacturer this product should be fine to use with your hermit crab but if you are worried then you can heat up your oven an heat dry the sand and this will make it even safer for your hermit crab. I hope this helps.

Silica is a quartz. The major constituant in sand from most parts of the the world is silca. This sand would be the same stuff you walk and play in at the beach if you live in Norh America EXCEPT that it is washed. If it has been properly washed the silica dust which can be harmful to lungs has been removed leaving only larger grains of sand which will not be inhaled and are not harmful if touched.

YES you can! This is a natural sand from the lake and is inert so it will not affect your water quality. My fish and live plants love it. It will also help you control the Nitrate levels in the tank as the fish will find and eat more food so there is less remaining to spoil. You will need to wash/rinse completely to remove the fine dust before using. I also bake the sand in a shallow aluminum pan ($2.00 at dollar stores) , with the sand just barely covered with water, at 350 degrees for 45 minutes to kill any bacteria or parasites and eggs, simply to protect my fish from possible disease and worms, etc. The sand also reflects light so the tank will look more alive and real. TRY IT....YOU WILL LIKE IT..... AND SO WILL THE FISH.

5 bags will fill approx 3ft x 3 ft x 3" deep