One of the key performance factors of an organization is the quality of its products and services. There is a worldwide trend towards increasing consumer expectations regarding the quality of products and services at ever lower prices.
In this way, there has been a growing awareness that continuous improvements in quality are often required to achieve and ensure good economic performance.
Certification brings benefits to companies, namely to the image of the organization, the increase in customer satisfaction, the focus on prevention, the mobilization around a common goal and to the reduction of waste and costs.

ISO 9001
dst is certified in the area of quality by APCER, under Norm NP EN ISO 9001, for the fields of "design, development, production and application of bituminous concrete" and "civil construction and public works, laboratory tests, maintenance of equipment and vehicles; design, development and manufacture of wood products and wood-based products, furniture and on-site assembly ".
CE marking
In the context of bituminous mixtures, dst complies with Regulation (EU) No. 305/2011, with CE marking affixed on blends produced at its plant, in accordance with NP EN 13108-1: 2011.
In 2015, CE marking was affixed to our recycled aggregates, produced at the WMU (Waste Management Unit) of the company, under the norm NP EN 13242: 2002 + A1: 2010. The WMU aims to promote the recovery of waste and the use of recycled aggregates, minimizing the consumption of natural resources and thus contributing to the preservation of the environment.
ISO 14001
dst has its Environmental Management System certified by the NP EN ISO 14001 standard in the areas of "civil construction and public works and maintenance of equipment and vehicles" and "manufacture of wood products and furniture".
The company is registered with EMAS in the areas of "maintenance of vehicles and equipment" and "manufacture of wood products and furniture". Certifications and registration in EMAS are maintained and improved through systematic audits of APCER (Portuguese Certification Association).
OHSAS 18001
Lastly, the company's Occupational Safety and Health Management System is also certified by APCER, according to OHSAS 18001 standard, in the areas of "civil construction and public works; maintenance and provision of vehicle and equipment services; production and application of bituminous concrete; execution of geotechnical works and special foundations; manufacture and assembly of wood, wood products and furniture ".