Bitutak MB is an APP Modified Bitumen Roofing Material. The product is designed to be installed by heat welding. Bitutak MB is manufactured from specially selected roofing grade asphalts that are blended with APP (atactic polypropylene) polymers in a unique process that enhances the weathering performance characteristics of asphalts. Bitutak MB is reinforced with a heat resistant non-woven polyester mat which provides the strength and durability necessary in a roofing membrane. Bitutak MB adapts well to the use of aluminum or other fine coatings.