Not sure it is 'Semtex', that would go down (up) with a bang :embarrassed:
Have a look at, https://www.sirn.it/en/marine-flooring-2/ (https://www.sirn.it/en/marine-flooring-2/)
SIRN SL90 is not just one product, but a full line of self-leveling, cement base underlayments, specifically designed and developed for the marine market.
They all can be used for levelling the unevenness of the decks or for a final screed before the installations of carpets, vinyl, rubber, tiles.
The products are MED certified and they all have the outstanding capability to adhere to the steel deck, thanks to SIRN Primer Semtex T1.
According to the specific needs, SIRN SL90 are always chosen with the optimal density, within the following range:
0,9kg/dm³ – 1,1kg/dm³ – 1,6kg/dm³.
During the last 10 years, SIRN SL90 has been applied with great success in many thousand square meters on the Cruise vessels of the most important Ship-owners worldwide.
and https://www.sirn.it/en/the-company/ (https://www.sirn.it/en/the-company/)
With 50 years of experience, SIRN is the leader company in marine flooring and representation. Certified ISO 9000 since 2001, SIRN has always stood out for its striving for innovation, quality and safety, which are constant traits in its over 50 years of experience.
In the field of production and application of marine floorings, the company became the licensee for the DUNLOP SEMTEX formula already in the Sixties. In the years that followed, exploiting the expansion of the Italian ship building industry, it developed a range of technical floorings to answer the market’s needs.
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See also: https://www.brynmawrhistoricalsociety.org.uk/semtex (https://www.brynmawrhistoricalsociety.org.uk/semtex)
The Brynmawr Rubber Factory - SemtexOver the years this area has seen much of its heritage destroyed either by being allowed to fall into an irreparable state, or because of an inability to understand the significance. One such tragedy was the destruction of Brynmawr’s Rubber – later Semtex - Factory, world- renowned as an outstanding example of modern architecture. A post card issued by the Twentieth Century Society in support of a campaign to save the Brynmawr Rubber Factory, stating how this organisation was “working with local people to save a great building.”