This is 50lb of 100 mesh Olivine sand. We primarily sell this for high-temp purposes (foundry, fireplace sand, etc), but it is also used by some in laboratory settings, as blasting media, etc. This is the highest-quality Olivine sand we have been able to find and is a major component of many of our foundry sand products that we sell here and elsewhere.
Note that if buying multiple units, this item may come in several shipments from different locations (our stock is distributed across the USA to provide faster service).
Olivine sand has the advantage of a reduced health/safety impact compared to the more common sands available (silica). However it is still not prudent to breathe dust--please take steps to avoid this when handling or using this product. Please read the complete safety instructions for more details.