Alkalis Resistant Pharma Glass Reactors are free from heavy metals, and come with smoother surface for cleanliness. G. M. M. Pfaudler Ltd. Is an ISO 9001-2008 awarded company that manufactures Alkalis Resistant Pharma Glass Reactors. G. M. M. Pfaudler Ltd. Also manufactures wide range glass lined equipments. Alkalis Resistant Pharma Glass Reactors is available with a light blue colour glass. During corrosive chemical reactions, glass lining corrodes at a rate depending on the chemicals present and the temperatures.