GEO 7.0-200 NW is a 7 OZ MARV WEIGHT nonwoven needlepunched geotextile made of 100% polypropylene staple filaments. GEO 7.0-200 NW is resistant to ultravioletdeterioration, rotting, biological degradation, naturally encountered bases and acids. Polypropylene is stable within a pH range of 2 to 13. GEO 7.0-200 NW meets the following M.A.R.V. values. Click here for Product Data Sheet.