Industry

Bituminous membranes and  waterproofing technologies: a winning combination

Most waterproofing operations make use of bituminous or synthetic membranes for flat or sloping surfaces, the protection of foundations, underground constructions, structures to contain or transport water (i.e. swimming pools, tanks, aqueducts, large infrastructure, e.g. bridges, viaducts, tunnels, etc.).
Over the years the companies that produce bitumen-based membranes have continued to invest in the development of this technology, introducing new formulas to improve resistance to aging and testing innovative polymers to increase flexibility at low temperatures. Scalable stability has progressively improved with the introduction variety of bitumen embedded internal reinforcements. For the protection of external surfaces, a range of finishings have been introduced (natural slate chips or ceramic coated granules) or coatings that respond to specific technical requirements (release agents or, alternatively, adhesion promoters, reflective film, noise-reduction treatments, flame-resistant products).
For increased application safety, alongside traditional flame-applied membranes, self-adhesive membranes have been introduced.
More recently, we have seen the introduction of synthetic membranes, such as  polyvinyl chloride (PVC) or thermoplastic polyolefin (TPO), which are structurally similar to bitumen-based membranes, and have been developed to improve particular performance and application characteristics (reduced thickness, lighter weights, etc.).
The evolution of waterproofing techniques show how important the combination of innovation and cost optimisation is, above all the synergies that can be obtained with the use of appropriate raw materials. The technical characteristics of bituminous binders developed for industrial applications, which can in a sense be considered “ancient products‘, have nevertheless stood the test of time and the challenge of innovation.
After decades of cooperation with end-users and thanks to an ongoing dialogue, Eni has over the years developed bitumens that are suitable for the production of waterproof membranes. Eni’s industrial bitumens are, in fact, the result of constant adjustments and continuous upgrading, aimed at bringing together the different competences of bitumen producers and the makers of tools and equipment for waterproofing.

Eni’s industrial bitumens

Eni’s bitumens for industrial uses are produced at special plants using specific processes that, along with the careful selection of crudes, make it possible to obtain excellent final characteristics for the formulation of bitumen compounds - the polymer used in the production of waterproofing membranes.
Eni’s 160/220 grade industrial bitumens have been specifically developed for high-level waterproofing needs and industrial applications, such as bituminous membranes, pipe protection coatings, electrical, heat and acoustic isolation.
Two distinct penetration intervals have been identified in order to adequately modulate, over the year, the binding properties in relation to the formulation of typical winter and summer compounds.

Characteristics and performance

Eni’s industrial bitumens have high levels of resistance to aging, plasticity and reaction to low temperatures.
Equipped with specific chemical characteristics, they are designed to provide optimal compatibility with polypropylene polymers  in the preparation of waterproofing compounds. A 170/210 grade bitumen is also available, suitable for the preparation of SBS compounds.
Eni’s line of bitumens for industrial uses come in three grades: 70/100, 160/220 (of which 170/210 for SBS) and 280/320, and cover a range of requirements according to the polymers to be used.

Uses

Eni’s industrial bitumens also have special penetration, inversion point and age-resistant characteristics that make them especially suitable for the realisation of high-quality bituminous membranes.  Thanks to a marked compatibility with the polymers, the final product presents very high levels of flexibility, elasticity and resistance to oxidisation.
In this regard Eni’s Technical Assistance provides advice and guidance in the identification and use of the right bitumen for even the most demanding industrial uses.
Eni’s industrial bitumens also provide an excellent base for the formulation of a range of other bituminous products, such as oxidised bitumens, putty, pastes and bituminous paints etc.