Template:Materials - APP Base Membranes

Atactic polypropylene (APP) polymer modifiers are by-products of the polymerization of propylene gas into isotactic polypropylene (used for injection molding and extrusion). APP has a lower melting point and is more compatible with asphalt than isotactic polypropylene.

Bitumens modified with APP can display improved physical and mechanical properties. The improved properties are only possible if the APP is finely dispersed throughout the bitumen to avoid separation during manufacture and service.

APP modification of bitumens can impart the following changes in properties:

• increased softening point
• improved ultraviolet radiation resistance
• improved low temperature flexibility

Click on a manufacturer's name to see the full list of their products accepted for use in the RoofStar Guarantee Program

Manufacturer	Product Name	System Test Type (Wind)	Nominal Membrane Thickness (mm)	Approximate Weight (Kg/m2)	Reinforcement Material	Reinforcement Material Weight (g/m2)	Application
GAF	Ruberoid® Torch Smooth Membrane	‒	‒	‒	‒	‒	‒
GAF	Ruberoid® Torch Granule Membrane	‒	‒	‒	‒	‒	‒
GAF	Ruberoid® Torch Plus Granule FR Membrane	‒	‒	‒	‒	‒	‒
GAF	Ruberoid® EnergyCap Torch Granule FR Membrane	‒	‒	‒	‒	‒	‒
IKO Industries Ltd.	Armourplast Classic	‒	‒	‒	‒	‒	‒
IKO Industries Ltd.	Armourplast Granular	‒	‒	‒	‒	‒	‒