Polymers that are formed by polymerization from alkenes (olefins) such as ethylene, 1-butene, propylene or isobutene are called polyolefins. It is saturated hydrocarbons that form the most important group of plastics.
Polyolefins also include polypropylene and polyethylene. They have good electrical insulating properties and are resistant to chemical substances.
Polyolefins are easy to process because they are semi-crystalline thermoplastics. They are used to make construction foils, for example.
Flexible polyolefin (FPO) is the name given by some manufacturers to their thermoplastic polyolefin (TPO) products. TPO is much less stiff than, for example, polyethylene. Roofing membranes made of TPO are part of the plastic waterproofing systems. They consist of alloys of various individual plastics such as polypropylene, polybutylene and polyethylene as well as integrated reinforcement. Thermoplastic polyolefin waterproofing is often used for flat roof waterproofing.
Mechanical brackets or an additional load with edge line fixation are used for installation. Seams are hot gas welded. Thermoplastic polyolefin waterproofing membranes are available in various colours and are considered root-resistant in the cross-section. They are usually compatible with rigid polystyrene foam and bitumen, but not with PVC.
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