Corrosion protection is the whole point for using polymer concrete precast manholes and structures in collections systems.  It is therefore, important to confirm that the polymer concrete can handle the pH conditions it will be subjected to.  In order to confirm this, USCP has conducted sulfuric acid testing per ASTM C267-Standard Test Methods for Chemical Resistance of Mortars, Grouts, and Monolithic Surfacings and Polymer Concretes.  ASTM is an international standards organization.