Polypropylene is a chemically inert polymer and does not contain any post reactor modifiers that can be extracted over time or have a negative impact on the surroundings. With Catalloy process technology, Polypropylene's molecular structure is modified to provide a product with specialized properties that meet the requirements of flexible membranes such as:
-Outstanding dimensional stability -Low coefficient of expansion and contraction -Wide temperature seaming range -Good chemical resistance -No stress cracking
Polypropylene is available in an Inustrial Grade Formulation (IG) or an ANSI/NSF-61 certified Potable Water Grade (WP). With Polypropylene's excellent UV stability, it is often specified and warranted in exposed applications.
Polypropylene is most commonly manufactured with a fully encapsulated, polyester reinforcing scrim, giving it superior dimensional stability and tensile strengths. Polypropylene is a thermoplastic material which permits seaming by thermal fusion methods including hot air, hot wedge and extrusion technologies.