Composite materials are, by far, the most interesting of all such options in watchmaking. We classify them with all other exotic materials, including sapphire crystal, because there are very few of these types of watch cases, once one separates bimetallic ones.
On the other hand, watches that combine metals, polymers and ceramics do count as properly exotic, such as the Ulysse Nardin Diver (Air). As you can tell, we are using our editorial prerogatives to define exotic and, since the word is redolent of bias and opinion, why not!
In our original story about composites two years ago, we used an AI-derived definition for composites. Here is one from a commercial producer of composites: “A composite material is a combination of two materials with different physical and chemical properties.
When they are combined, they create a material which is specialised to do a certain job, for instance, to become stronger, lighter, or resistant to electricity. They can also improve strength and stiffness.
The reason for their use over traditional materials is that they improve the properties of their base materials and are applicable in many situations.” (Source: TWI Global).
No specific strength, toughness, or any other characteristic works for all composites. A strange myth abounds, though, that composites might not be suitable for water-resistance, but this message did not reach Casio nor the various shipbuilders who deploy carbon fibre and other such materials in their hulls. The bottom line on material properties when it comes to composites is that each material has to be judged on its own merits.
Having made all these points and caveats, a watch like the Hublot Big Bang Meca-10 Concrete Jungle proves our point that the excitement in watch cases comes from. We are particularly enamoured with this watch because we discussed concrete in our composite special. While Hublot has been plying its concrete craft since 2016, concrete has been making its mark on human civilisation for hundreds of years.
For reference, here is what we wrote in 2023: By many accounts, and no shortage of hard evidence, the Romans were extraordinarily successful with concrete. They were not the first to get to this material, but their particular recipe is widely recognised as being closest in terms of properties to what we use today. This extends to the use of the material to build jetties and other partially submerged structures – the Romans were the first to use a type of concrete (opus caementicium) that can set underwater, which is a property we take for granted today.
Some of the ruins are still with us today, and structures such as the Pantheon in Rome continue to be public buildings in the 21st century, alongside other major tourist attractions such as the Colosseum. We should note here that concrete also demonstrates that composite materials sometimes appear in nature as well, because barnacles secrete a sort of organic concrete to bind themselves to substrates.
Of course, metals will also remain an attractive option in the exotic department. We refer here to metals such as tantalum, which grace parts of the case of the new F.P. Journe Chronomètre Furtif, and aluminium, which forms the entire case of the Franck Muller Vanguard Royal Bauxite. Aluminium has also been embraced by brands such as Bvlgari for many years, so it is hardly completely novel. We expect brands to continue these efforts, perhaps experimenting with something bold, now and again.
This story was first seen as part of the WOW #79 Summer 2025 Issue
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