The raw material arrives at the plant where it’s inspected and graded according the AREMA standards (American Railway Engineering and Maintenance – of ways – Association), (www.arema.org). The sleepers accomplishing the requested grade are submitted to the impregnation process. The selected wood is introduced in vacuum pressure vessels, called autoclaves, at high temperature (+85°C) initially under vacuum (-10psi) in order to extract water, and later on under pressure to inject creosote.
Creosote is a fungicide and insecticide oil that immunizes the wood and protects it from wood-eating organisms. The complete process can last from 24 to 36 hours, depending on the previous condition of the wood, and it shall meet the American Wood Protection Association, AWPA, (AWPA Standars; www.awpa.com)
The treated wood products are inspected and tested to double check that they meet the required quality standards. In addition, we have a permanent external third party auditing control for quality assurance certification such as Fundación Chile (www.gcl.cl) y SGS (www.sgs.cl)