Product Short Description: SELENIUM METAL PELLETS Electronic GRADE Product Description: Selenium metal is odorless and tasteless, but the vapor has a putrid odor. The material is highly poisonous, and is used in insecticides and in ship-hull paints. Foods grown on soils containing selenium may have toxic effects, and some weeds growing in the Western states have high concentrations of selenium and are poisonous to animals eating them.

Product Short Description: SEASAND PURIFIED PARTICLE SIZE 40-150 MESH Product Description: Mesh Size (or U.S. Sieve Size) is defined as the number of openings in one square inch of a screen. For example, a 36 mesh screen will have 36 openings while a 150 mesh screen will have 150 openings. ... For example, a product identified as -100 mesh would contain only particles that passed through a 100 mesh screen.