Chem Show Booth 2365. Style 1092 Maxi-Span non-metallic expansion joints are often used in the most demanding industrial ducting systems. Rated to 400°F continuous service with a pressure rating of 3 PSI, these expansion joints may be used in wet or dry corrosive applications such as flue gas cycling through its due point, sulfur dioxide, sulfuric acid and most other chemicals. Sizes for round connections range from 14-100" for ID and from 10" x 10" in unlimited combinations for rectangular connectors. General Rubber Corp. 11 Empire Blvd. S. Hackensack, NJ, 07606