Sigma Scientific Glass Pvt. Ltd offers Grouting of Base. Sigma Scientific Glass Pvt. Ltd is an ISO 9001:2000 certified company. Grouting of Base is used in chemical, pharmaceutical, dyes and allied industries. These are designed to support plant and other equipments in borosilicate glass 3.3. The Grouting of Base is cast iron based and available with four foundation bolts, each with 2 nuts. These bolts are fitted so that base is raised up to 150 mm from head of bolts.