Abstract
Twenty-three types of unclad laminates based on phenolic, melamine, silicone, epoxy, and polyester resins were examined after exposure in alkaline soil at Roswell, New Mexico, and in acid soil at Bainbridge, Georgia. The laminates have initial insulation resistance values ranging from 1.4 × 10 <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">6</sup> to less than 30 megohms. Each suffers a large decrease in insulation resistance upon exposure. The percentage decrease can be in excess of 90 percent after four years underground exposure in New Mexico or Georgia. Moderate decreases in flexural strengths also were observed.
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