While MasterFormat is the industry standard for organizing specifications for commercial projects, there are category exceptions specifiers, general contractors, and others should know about when using the CSI formats in the specification process. A change has recently been enacted that adds another subcategory to Section 08 54 00–Composite Windows. As of September 16, 2016, products made out of vinyl and wood must use the spec group 08 54 73, making them a different grade than a thermoset composite. Fiberglass thermoset products remain in the original composite category, Section 08 54 13–Fiberglass Windows.