Skip to Main Content
U.S. Forest Service
Caring for the land and serving people

United States Department of Agriculture

Home > Search > Publication Information

  1. Share via EmailShare on FacebookShare on LinkedInShare on Twitter
    Dislike this pubLike this pub
    Author(s): Rebecca E. IbachCraig M. ClemonsNicole M. Stark
    Date: 2003
    Source: Seventh International Conference on Woodfiber-Plastic Composites (and other natural fibers), May 19-20, 2003 ... Madison, Wisconsin, USA. Madison, WI : Forest Products Society, 2003: Pages 61-67
    Publication Series: Miscellaneous Publication
    PDF: View PDF  (1.0 MB)

    Description

    During outdoor exposure, woodfiber-plastic composites (WPC) are subject to biological, moisture, and ultraviolet (UV) degradation. The purpose of laboratory evaluations is to simulate outdoor conditions and accelerate the testing for quicker results. Traditionally, biological, moisture, and W laboratory tests are done separately, and only combined in outdoor field exposure. This research evaluates WPCs exposed to a combination of UV, moisture, and fungal degradations. Due to the slow moisture sorption of WPCs, the ASTM D 1413 standard laboratory soil block test was modified to include preconditioning by W and water. WPCs consisting of 50 percent western pine wood flour and 50 percent high-density polyethylene (HDPE) were extruded into 30 by 140 mm (1.2 by 5.5 in.) radius edge deck boards. Four blends were extruded containing the following additives by weight percentages: 1. control; 2. 1 percent zinc borate; 3. 1.5 percent W stabilizer package; and 4. 1 percent zinc borate + 1.5 percent UV package Specimens (3 by 13 by 89 mm) were cut from the boards and exposed to one of two preconditioning methods: 1. 2-week water soak or 2. 1,000 hours in a weatherometer plus a 2-week water soak. After the 2-week water soak the autoclaved “wet” specimens were placed in a modified soil block test against the brown-rot fungus Gloeophyllum trabeum for 12 weeks. Moisture content and weight loss of the specimens were determined after 12 weeks. Matched field stakes were placed above and in-ground in Madison, WI, and Saucier, MS, for ultimate comparison.

    Publication Notes

    • We recommend that you also print this page and attach it to the printout of the article, to retain the full citation information.
    • This article was written and prepared by U.S. Government employees on official time, and is therefore in the public domain.

    Citation

    Ibach, Rebecca E.; Clemons, Craig M.; Stark, Nicole M. 2003. Combined ultraviolet and water exposure as a preconditioning method in laboratory fungal durability testing. Seventh International Conference on Woodfiber-Plastic Composites (and other natural fibers), May 19-20, 2003 ... Madison, Wisconsin, USA. Madison, WI : Forest Products Society, 2003: Pages 61-67

    Keywords

    Woodfiber-plastic composites, fungal decay, ultraviolet exposure, water exposure, durability

    Related Search


    XML: View XML
Show More
Show Fewer
Jump to Top of Page
https://www.fs.usda.gov/treesearch/pubs/7436