It is obvious that the quality of the recycled de-vulcanised grains is depending on a number of issues.​

A major point is the cleanliness, another point is the consistency of the grains. Are they from the tread or from the side walls, or from both?​

Are they coming from conveyor belts, fenders or tracks?​

Evidently a new compound using de-vulcanised active rubber grains needs to be engineered carefully for each new application.​

A major issue in the re-use of de-vulcanised rubber is the compensation of the other elements in the compound. (pro rata in phr, %, volume or weight). If this is not done, then the quality of the compound will diminish.​

Most traditional labs ignore this critical point because they are not familiar with such an issue.