Some credit-compliant products may need additional lead time, and components treated for fire-resistance can be hard to find for specific applications. UF is an inexpensive binder that is widely used in interior-grade particleboard, MDF, and plywood. It is not moisture-resistant, so it is not found in exterior-grade plywood, making this a good way to find credit-compliant products. UF also doesn’t bond well with silica-rich fibers like straw, so it isn’t used in many agrifiber panels.