The molecular sieve base shall have a ratio of silicon to aluminum of 4.9. The bulk density of the base material is 49-51 pounds per cubic foot. The hardness on the Mohs Scale is a 4.0 and the specific surface area is 40 square meters per gram. The material is thermally stable to 650 degrees Celsius and is stable at pH’s as 1.0 and as high as 13.0. Mesh size shall be a Tyler screen 4 x 8.The impregnate shall be 12.5% phosphoric acid molecular sieve base. The moisture content of the impregnated sieve shall not exceed 15%. The bulk density of the impregnated media shall be 59-61 pounds per cubic foot.