Type 1 PP conforming to ASTM D2146 is a polyolefin which is lightweight and generally high in chemical resistance.

Normally opaqued by the addition of carbon black.  The naturally translucent material without carbon black is prone to degradation due to ultraviolet light penetration.  Unaffected by alkalis, salts, organic solvents, and most acids, particularly hydrochloric and phosphoric acids. 

Unsuitable on strong acids, chlorinated hydrocarbons and aromatic compounds.

PP is joined by the thermoseal fusion process, threading or flanging.

General

• Liners for pipe and equipment
• Packing
• Pipe

Sulphuric Acid Plants

• Gas cleaning system
• Liners for pipe and equipment
• Packing in gas cooling towers and mercury absorption towers
• Free sulphur trioxide (SO₃) will attack PP.  Therefore, 98% H₂SO₄ should be considered the absolute maximum concentration to be handled  by PP.  Other circumstances where free SO₃ may be present should be avoided.