Plywood and other products that are “exterior-grade” or need to withstand wet conditions are usually made with phenol-formaldehyde resin.    From Wordnik.com.  [Alternatives for significant uses of formaldehyde in Massachusetts] Reference

Kraus would also use exterior-grade plastic enclosures for housing the light switches and electrical outlets.    From Wordnik.com.  [Electronic House Recently Filed] Reference

Mixed with whiting (while clay, corn starch or wheat flour) and/or sand, gravel or rocks, this is the basis of plaster of Paris, stucco, concrete and long-lasting, exterior-grade whitewash.    From Wordnik.com.  [Mother Earth News Latest 10 Articles] Reference