In May, prices for many materials used in glass and glazing manufacturing climbed again, according to the latest Producer Price Index (PPI) from the U.S. Bureau of Labor Statistics.

The monthly PPI for flat glass in the commodity category fell 0.4 percent from the previous month, and it’s up 2.6 percent from May 2017. According to the BLS, the commodity classification “organizes products and services by similarity or material composition, regardless of the industry classification of the producing establishment.”

The index for flat glass manufacturing in the industry classification fell 1.2 percent, but those prices are still up 7.2 percent since May 2017. The industry classification measures “changes in prices received for the industry’s output sold outside the industry (that is, its net output).”

Prices for fabricated structural metal products were up 2.4 percent, but that index, in the commodity grouping, is up 7.8 percent for the year. Ornamental and architectural metal product manufacturing, in the industry category, saw price increases of 1.4 percent for the month and 9.3 percent since 2017.

The PPI for metal windows rose 0.6 percent from its April level, and is 6.9 percent above 2017’s report. Metal doors and frames increased 0.6 percent for the month and are up 5.6 percent for the year.

The cost of builders’ hardware, which includes hardware used in doors and windows, fell 0.7 percent in May. Those prices are 1 percent higher than in 2017.