Hima Sales Pipes Are Basically Multilayer Pipes Having Outer And Inner Layers Of Conventional PVC And Middle Layer Of Foamed PVC. Outer And Inner Layers Are Designed To Take The Load And Middle Layer Of Foamed PVC Gives Rigidity And Maintains The Shape Of The Pipe Under Load. It Reduces Total Weight Of Pipe And Makes It Light When Compared To Solid Wall PVC Pipes. The Pipe Is Typical Of Solid Wall PVC Under Load And The Type Of Distortion Is Normally Expected.