History of Teranap BGMs

In the 1970s, French company Siplast developed the world's first bituminous geomembrane - Teranap.

The development of Teranap has its roots in the 1960s when Siplast and Dutch oil giant Shell began a program to improve the properties of bitumen and develop bitumen based products for use in waterproof applications.

The result was a styrene-butadiene-styrene (SBS) modified bitumen that could be used over a wide range of temperatures.   This highly durable elastomeric blend also had exceptional elongation and recovery properties.  Siplast soon began manufacturing this modified waterproof bitumen using its scientifically engineered blend.

This modified bitumen blend was initially used for sealing roofs, and many of the original Siplast roofs are still in existence 50 years later. Over the years SBS-modified bitumen roofs have changed the least, lasted longer, and performed better than other sealants.

In 1975, with the cooperation of the ‘Godfather of geosynthetics,’ Mr JP Giroud, Siplast began manufacturing the first Teranap BGMs.

To create Teranap, a non-woven polyester geotextile is run through a molten SBS-modified bitumen bath to achieve complete saturation. It is then run through a second bath of the same SBS-modified bitumen to add a top and bottom sacrificial layer. 

Finally a sanded layer is added to provide a surface that will enhance the grip and provide friction, as well as a polyester film on the underside for added puncture resistance.


Teranap manufacturing line in France