What requirements should metal parts and components comply with to be allowed on the European market?

For Developing Country exporters, the product and production process is subject to three types of requirements:

• Musts: legal and non-legal requirements you must meet in order to enter the market.
• Additional requirements: relatively common requirements that most of your competitors have already implemented. In other words, the ones you need to comply with in order to keep up with the market.
• Niche market requirements for specific segments.