Wood Flour FAQ What is wood flour? How do you determine mesh size? When is wood flour considered dry? Will wood flour absorb moisture? What color should wood flour be? How do I determine the proper type of wood flour to use in my composites? Q.  What is wood flour? Wood flour is a finely ground wood cellulose.  When the mesh size is above 20 mesh or below 850 microns, a product generally is considered to be wood flour.  Q.  How do you determine mesh size? Mesh size is determined by the number of openings in the screen, measured to the linear inch; the higher the mesh size, the smaller the particle and the lower the number of microns, the smaller the particle. [ < -------- 1' ------- > ]                                          4 MESH Back to Top Q.  When is wood flour considered dry? While wood flour can be made either wet or dry, most composite applications use extremely dry wood flour.  Many applications require less than 1% moisture.  Wood flour is referred to as dry if its moisture content is 8% or less. Back to Top Q.  Will wood flour absorb moisture? Wood flour is hydroscopic and will absorb moisture from the atmosphere over time. Back to Top Q.  What color should wood flour be? The color range that you will find in wood flour is as broad as you will find in wood itself.  This may range from almost white to brown.  The color of a particular wood species is controlled by nature, not your wood flour manufacturer. Back to Top Q.  How do I determine the proper type of wood flour to use in my composites? The product that you use in your composites should be as important to your supplier as it is to you.  It is very important for you to work with the wood flour manufacturer to determine the proper product for your particular application.  Mesh and species are not always the defining factors when specifying wood flour.  The raw material that manufactures start with and the methods they use to process the raw material can have a significant effect on the finished product. Back to Top 2006 P.J. Murphy Forest Products Corp. | P.O. Box 300 Montville, NJ 07045 | Phone: 800-631-1936 | Fax: 973-316-9455