Raw materials have different qualities and different specific shrinkage percentages.
Pipe manufactures have often been tied to a fixed raw material and a fixed supplier, among other things because they did not have the calibrating sleeves in stock in the size required for the shrinkage percentage of the material in question.
The RIVAL® adjustable calibrating sleeve helps manufacture pipes within the tolerances, even with materials with considerably higher shrinkage percentage variations.
Imagine being able to choose your raw material supplier as you wish. What is most profitable – a cheap product with a high shrinkage percentage or a more expensive product with a lower shrinkage percentage?