Taj Enterprises PUDUCT, GREYDUCT, bhangdipipe, GREENDUCT, POLYURETHANEDUCT , SILICONDUCT Excellent Abrasion-Resistants: PU Ducts are commonly used to convey powders, wood shavings, grit, dust, extract waste and to transport other abrasive transportation media. Food Graded: Many PU that use food-grade materials or ones that comply with the relevant EC and FDA directives are good for transporting edibles. Silicone Ducting – Master Sil 1 and Master Sil 2 Master Sil's are excellent for many applications, including air/brake ducts in car engines, railway carriage HVAC systems, steam vents on industrial washing machines, chemical solvent and toxic fume venting.