Plastazote stiffened cap peak. Photo caption: For further information contact: Press Office, Bakelite Xylonite Limited, 8 Grafton Street, London W1A 2LR, Tel: 01-629 8100. BXL PLASTAZOTE REACHES A NEW PEAK. BXL Plastazote foamed polyethylene is used in the new 'Romp'n Rest' children's beach caps from I Solomon and Co Ltd. Plastazote serves as the stiffening agent in the peaks of the caps, offering the advantages of being light in weight and washable. This item is part of the MoDiP BXL collection.