EXHIBIT B PLEDGE AGREEMENT This Pledge Agreement (the "Agreement") is entered into as of the 15th day of May, 2000 between HydroChem Holding, Inc. ("Lender") and B. Tom Carter, Jr. ("Pledgor"). WHEREAS, Lender has granted a stock option (the "Stock...Pledge Agreement • August 11th, 2000 • Hydrochem Industrial Services Inc • Services-services, nec • Texas
