laboratory equipment made of ceramic or plastic corrosion resistant materials, namely laboratory bench tops and laboratory sinks, neutralizing apparatus and devices, namely apparatus used in laboratories to adjust the pH value of liquids to a neutral value, pipes for laboratory purposes, ducts for laboratory purposes

laboratory equipment; namely, ceramic or plastic corrosion resistant laboratory bench tops, ceramic or plastic corrosion resistant laboratory sinks; ceramic or plastic corrosion resistant non-combustible waste gas piping, ceramic or plastic rectification columns, ceramic or plastic neutralization columns, ceramic or plastic neutralization plants, ceramic or plastic stirrers, ceramic or plastic heat exchangers, ceramic or plastic reaction vessels