Definition. A metric space is a set X together with a function d (called a metric or distance function) which assigns a real number d (x, y) to every pair x, y X satisfying the properties (or axioms): 1  d (x, y) 0 and d (x, y) = 0 x = y, 2  d (x, y) = d (y, x),
Here are some facts and guidelines about formaldehyde in plywood and OSB that can help you when building a chicken coop: 1  Formaldehyde is used in the binders and resins of some manufactured wood products. 2  Offgassing can be an issue with products containing urea-formaldehyde (UF) resins.
The Formaldehyde Standards for Composite Wood Products Act, signed into law July 7, 2010, by. President Obama, added Title VI to the Toxic Substances Control Act (TSCA). The law established. limits for formaldehyde emissions from composite wood products: hardwood plywood, medium-. density fiberboard, and particleboard.