Celsius baths are manufactured in Carronite™, Carron's unique, patented manufacturing process.

Comprehensive tests demonstrate that Carronite™ baths:
Are twice as strong as standard acrylic baths.
Ensure water retains heat for far longer than in a cast iron or steel bath.
Have a unique cradle support system; this has been designed to   cope with the additional weight of the Carronite™ material. Once  installed, the bath’s stability and rigidity prevent movement thus offering the   perfect solution to the problem of sealing.
Are 25% more slip resistant than a cast iron or enameled steel bath.
These results are the reason that:

More industry professionals would recommend a Carronite™ bath   over any other currently available.
We have confidence in the lifetime of the product to offer a 30 year   manufacturer’s warranty

Carronite is an advanced reinforcement applied to Carron acrylic baths,
developed and patented by Carron Bathrooms. A Carronite reinforced
bath has a strength and rigidity normally associated with a cast iron or
heavy gauge steel bath, while still offering the benefits in finish, design and ease of care of modern acrylic baths. The Carronite coating also helps prevent the water from cooling during a long soak and has a proven track record in the luxury hotel business where design and durability are essential.