Material Comparisons Specific Densities: Pure water equals 1kg per litre  1000 litres of water equals 1 Cubic metre = 1000kgs or 1 Metric tonne Therefore the specific density of water is 1 The specific density of all metals are measured against this SD of Stainless Steel = 7.65                  7.65 tonne per cubic metre (m3)  To build an 8000L tank of the same dimensions using the same configuration for baffles etc we would require 10 sheets The fabrication times for these products are fairly close although plastic and aluminum being much lighter require less handling. Cutting, welding and finish work are much the same except for steel which requires some form of protective coating. Comparing the finished tank weight based on 10 sheets    Material  Tank Weight  Aluminum 5mm  576 kg  Steel (mild) 4mm  1400 kg  Stainless Steel 3mm  1032 kg  Plaztuff™ 12mm  513 kg   When compared with Plaztuff™: Aluminum will corrode is prone to dissimilar metal corrosion and electrolysis Stainless Steel is prone to dissimilar metal corrosion is twice the weight Steel needs protective coatings , it will still rust and is almost three times the weight Plaztuff™ can be specified to your customer's exact requirements Colour, UV Stabilizers, fire retardants and chemical inhibitors can be added to create product specific to its environment Plaztuff™ does not Rust, Rot, Corrode, get osmosis or electrolysis and will handle a wide range of chemicals and fuel oils. When welded Plaztuff™ will not lost a grade, change its properties in any way shape or form and will not expose the material to rust or corrosion Plaztuff™ is easily worked with a wide range of tools and machinery, can be machined, tapped and routed Plaztuff™ has very good engineering properties when compared to rotary molded Medium Density Polyethylene Plaztuff™ is FDA specified as a food grade material and can be specified for use as a fuel grade material