Expanded aluminum or aluminum expanded metal mesh has apparent features and benefits compared with perforated metals. It has solid areas within and on the borders, has excellent strength to weight ratio and a number of patterns. Aluminum expanded metal offers good acoustic properties and the open areas ranges from 36% to 70%. It is available in most material types and finishes. Aluminum Expanded Metal offers the following benefits: Cost effective alternative to perforated metals Less material waste during manufacturing, you don't pay for the holes like in perforated Key material for filtration Available in flat and raised forms Highly versatile product for shaping, cutting, cylindrical and tube forming.