Test pieces (samples) are taken from the cured-in-place-pipe. The sampling point must be determined in advance with the customer.

The material tests will be commissioned by the customer at his expense.  Only data from the representative material sample is used and accepted for the assessment of the material properties.

If a sample taken from the manhole does not reach the required material characteristics, a single representative sample will be taken from the sewer at the contractor's expense (including all necessary additional expenses) in consultation with the client and the sample will be discarded from the manhole [DIN 18326, VOB/C].

[DIN 18326:2019-09]