Processindustry equipment index. Weighted average of 8 of these: cement 2% paint 5% chemicals 48% paper 10% clay products 2% petroleum 22% glass 3% rubber 8% MS was 100 in 1926. Published in "Chemical Engineering". ⎟⎟ ⎠ ⎞ ⎜⎜ ⎝ ⎛ index value at timet index value now ChE 4253 Design I