Products How to contact us Colombo Bolla SpA The company COLOMBO BOLLA SPA began its activity in the second half of the 19th century, as a company for the sale of lime and cement and subsequently building materials. The activity was expanded with the importation and marketing of fossil coal and coke, which at that time was used by industry as the only energy source. The foundry sector was that which, in addition to the quantity used, required coal with particular characteristics, capable of melting the pig iron from blast furnaces. It is in this sector that with the change of energy sources used for forming, introduced with the technological evolution. In fact, the castings are no longer cast in natural earth, used "as it is" from the quarries of extraction, but use is made of washed and dried silica sand which guarantees the possibility of maintaining constant the characteristics of the molding earth. , obtaining better quality castings. Since the introduction of washed and dried silica sand, COLOMBO BOLLA has placed its attention on this product, offering a wide range of types, according to the needs of its customers who, in order to obtain increasingly more dimensionally precise castings, require particle sizes different and free of impurities. This last feature is guaranteed by the transport service, carried out by own means. Earths, refractories, fuels and molten cement are still marketed materials, to offer customers a complete service, including accessories. In the last 10 years, the business has expanded with the introduction of special sands for animal use with the full range that the market offers as cat litter. In the product sector of animals, aquariology is distinguished, where one of the main aspects is the point ornament whose bottom is mainly made up of grits and quartz which, with silica sand, have a certain affinity . It is therefore natural for COLOMBO BOLLA to enter this sector, immediately becoming a leader for the possibility of sourcing and importing the raw material directly from the source. replica . ralph lauren polo shirts ralph lauren shirts ralph lauren usa ralph lauren jacket ralph lauren shorts ralph lauren online outlet ralph lauren sweater