Text version of the page

Overview Evaluating adhesion of PVC coating

The evaluation process for adhesion of PVC coating on conduit is governed by NEMA RN-1 section 3.8,Adhesion,which states,“The adhesion of the PVCcoating to the conduit shall be greater than the strength of the coating itself.”This adhesion test is straightforward and simple.There are no specializedconditions necessary to perform this test.Ocal routinely performs quality-control testing — including the adhesion test — on conduit as it rolls off the line.Conduit that passes this test demonstrates that the adhesion will provide years of trouble-free service.The following demonstration shows Ocal PVC-coated conduit being subjected to the adhesion test.
Corrosion Protection for Electrical Conduit and Fittings

1 2 3 4

Step 3, the tab is pulledperpendicular to the conduit witha pair of pliers.The plastic tab willtear off rather than having any peeling effect or the coating separating from the substrate. Step 1 consists of two cuts through the plastic to the substratealong the length of the conduit,approximately Step 2 calls for the edge of the PVCthat was cut on the perpendicular tobe carefully lifted to form a plastic tab. Step 4 is the evaluation of the test,which in this case,results in apassing grade for Ocal.This result is more testimony to the fact that Ocal is “Better by Design.”In
1 �
2 " apart and 3" to 4"in length.A third,perpendicular cutcrosses the lengthwise parallel cuts.

Results

With Ocal PVC-coated conduit and fittings,you get corrosion protection that will extend the life of your electrical raceway systems for years and years.

7