For the purposes of UNE 100716 standard the following measurement criteria are established:
- Any result for the mentioned formula of a value under 1 m², the total surface must be measured as 1 m².
- The TU (transversal union) value must be as follows:
- For sheath = 0,024.
- For comprehensive profile 20 = 0,120 (to be determined by each manufacturer).
- For comprehensive profile 30 = 0,170 (to be determined by each manufacturer).
- For other unions = union development (mm) / 1000.