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�� A,sht'aRd �� Ashland Specialty Chemical Company Division of Ashland Inc. Specialty Polymers&Adhesives Division Address Reply: 802 Harmon Avenue Columbus,OH 43223 Tel: (614)232-8510 Fax:(614)232-8520 DURABILITY OF EPI ADHESIVES Durability measures how well cured adhesive bonds and the laminate will resist the reversible effects of heat and moisture and their related short tertn swelling and shrinking stresses. In many cases the exposure selected for the laboratory test environment may be a function of the maatimum temperature of moisture content expected in service. Many of these test methods and specifications have a great deal of history in terms of their minimum requirements and how manufactured parts have performed over many years of service. Some key tests for the durability of adhesives are listed below: ASTM 2559: Standard Specification for Structural Laminated Wood Products for Use under Exterior Exposure Conditions. This test is a cyclic delamination test in which bonded wood samples are subjected to extreme exterior conditions and examined for delamination and bond strength. ASTM 3434: Standard Test Method for Multiple-Cycle Accelerated Aging Test(Automated Boil Test) for Exterior Wet Use Wood Adhesives. This is a valuable method to assess the durability as well as the permanence of adhesives. It can be used as a short-term method to measure the durability of adhesive bonds as a comparative test when solid wood or an adhesive of known performance is used as a control. It can also be used to measure the long-term performance and the degradation of the composite, materials, and adhesive bonds. PERMANENCE OF EPI ADHESIVES Permanence is a term that in most contexts refers to the service life of the adhesive bonds. There are many factors that can affect the service life of an adhesive. The principle factors generally accepted as having the greatest effect on degradation, especially in wood bonding, are related to the environment including moisture, heat, shrinking and swelling stresses, chemicals, and biological factors. Accelerated aging testing was completed to examine the effects of wood chemicals on adhesive bond performance. Specimens were evaluated under various accelerated aging tests including continuous exposure to steam, water, dry heat, and the automatic boil test. Quality Plus: Headquarters: Tel: (614)790-3333 Ashland's Commitment to 5200 Blazer Parkway Fax: (614)790-4119 Quality and Productivity Dublin,Ohio 43017 http://www.ashspeacom