Grontmij worked with Tayside Contracts when they were developing their Tayset cold mixed recycled asphalt product. Tayset is produced from recycled asphalt planning with a modified bitumen emulsion provided by Nynas. Grontmij provided the performance testing and assessment services with Prima100 during the product development and site trials. Tayside contracts later purchased their own Prima100 for use by their in house laboratory when Tayset went into production.