Technical
Quality control of natural stone products
Eva Portas Fernández
The importance of joints in the natural stone floors: material and type and more suitable
Eva Portas Fernández, Technical consultancy area Granite Technology Center www.fctgranito.es
Survey: Multi-wire machines
Over two years ago this magazine published a survey on multi-wire machines, and the article was well received by our readers. Being a new, evolving technology, during this period the different manufacturers have brought out new, improved models of this machinery, and we have found it appropriate to publish an updated version of the survey. The questions were sent to the different companies and we publish here the replies of those who answered them.
Questions:
1.- Is your machine supported on 2 or 4 columns?
WONASA GUIDE Frequently asked questions by architects and designers on Natural Stone - and the answers
An initiative of WONASA (World Natural Stone Association) www.wonasa.com
The importance of degree of absorption
In many cases the detergents are responsible for the loss of shine and some deterioration in the surface of the stones. This is the result of formation of salts inside the small pores which are in the stones.
The abundance of chemical compounds which permit that every detergent cleans more or cleans better, is responsible for dirtying from inside the pores of the stones with salts that when dissolved in water, enter easily but remain there when the water evaporates, because the salts do not evaporate.
Underground mining in perspective
Paul Daniel, paulantdaniel@arrakis.es
Dr Nicola Careddu, ncareddu@unica.it
Natural Stone vs Glass: the balance looks right
Facades of natural stone show remarkable energetic advantages in comparison with glass facades. This is the result of an extensive study that compares facades of natural stone and glass.
