Chlorination is used to make polyethylene flexible and can be heat or solvent welded. This is generally compatible with bitumen.
Ethylene Propylene Diene Terpolymer
EPDM a naturally flexible material and carbon black is added to give it stability.
FPO is a large family of heat-weldable polyolefin based upon polyethylene or polypropylene. These membranes can be suitable for direct contact with aged bitumen and can be recycled back into themselves or another product.
Due to the addition of high molecular weight plasticizers is flexible form that can be heat or solvent welded. Unless there’s a suitable weight fleece separating the two it can’t be used in direct contact with bitumen.
Thermoplastic Polyolefin Elastomer
It’s a group of polyolefins that contain the basic properties of elastomers which can process as thermoplasts. They have a resistance to UV/Ozone exposure and doesn’t absorb moisture.
It uses carbon black to provide good physical properties. PIB products are generally solvent welded using tape systems. and are compatible with bitumen.
Vinyl Ethylene Terpolymer
VET consists of PVC made flexible by blending with Ethylene Vinyl Acetate (EVA). VET can be heat or solvent welded and is compatible with bitumen.