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�"�''`. <br /> Ash�'and <br /> Ashland Specialty Chemical Company <br /> Division of Ashland Inc. <br /> Specialty Polymers&Adhesives Division Address Reply: <br /> 802 Harmon Avenue <br /> Columbus,OH 43223 <br /> Tel: (614)232-8510 <br /> Fa�c:(614)232-8520 <br /> Permanence Testing: <br /> Accelerated Aging Tests: Data was analyzed to determine the correlation of adhesive bond <br /> performance to wood chemical characteristics and exposure conditions. The higher the correlation <br /> factor, the more sensitive an adhesive is to the tested condition. The results are shown in Figure 3. <br /> Figure 3: Correlation Coefficients for Wood Chemical Characteristics as Related to Adjusted Shear <br /> Strength for Epoxy, EPI, and PRF adhesives. <br /> 0.9 <br /> 0.8 <br /> 0.7 <br /> 0.6 <br /> �EPI Adhesi�e <br /> 0.5 <br /> ��- �Epoxy Adhesi�e <br /> 0.4 <br /> —,� pPRF Adhesi�e <br /> 0.3 - ��� ..�e <br /> �"" ( °�_ <br /> 0.2 ��� _ _ _ ; � �; <br /> �� y <br /> 0.1 � ;�,;u i ��-. <br /> ,A�� '�_ <br /> 0 <br /> 30 Day 30 Day 100 Cycles 800 Cycles <br /> Steam Water Soak ABT ABT <br /> The shear strength of EPI adhesives could not be correlated between chemical characteristics of <br /> wood and accelerated test methods for bonded joints. <br /> CONCLUSIONS: <br /> When measuring the longevity of adhesive bonds it is important to address both the durability <br /> (physical stability) and the permanence (chemical stability). Subjecting laminates and their <br /> adhesive bonds to moisture, heat, and shrinking and swelling stresses provides an indication of the <br /> short-term performance of the composite. Long-term tests either addressing the phycical and/or <br /> Quality Plus: Headquarters: Tel: (614)790-3333 <br /> Ashland's Commitment to 5200 Blazer Parkway Fax: (614)790-4119 <br /> Quality and Productivity Dublin,Ohio 43017 http://www.ashspec.com <br />