Failure cement/primer

RC failure at the polyurethane cement interface CP failure at the cover cement primer interface CM failure at the metal primer interface R failure in the polyurethane... 

CP - Cement/Primer failure failure at the cement (adhesive) to primer interface. 

Cement/primer (CP) failures are characterised by the appearance of the primer on the bonded surface. Usually the adhesive and primer are different colours to allow for easier identification of both layers. CP failure is usually caused by contamination of the primer surface before application of adhesive, migration of plasticiser from the rubber into the adhesive/primer interface, insufficient drying of the primer film before application of the adhesive or by incompatibility between primer and adhesive. 

CP = failure at the interface between the cover cement and the primer cement. 

CM - Cement/Metal failure failure at the primer to metal interface. For one coat adhesives, this is failure at the adhesive to metal interface. 

Cement/metal (CM) failures usually indicate a problem with metal preparation or application of adhesive. They are characterised by the appearance of bare metal in the bonded area of the part. Common causes of CM failure include poor metal preparation, i.e., the presence of contamination on the metal before application of adhesive, insufficient dry film thickness of primer, failure to properly agitate the adhesive to achieve a uniform dispersion prior to application, environmental attack (salt, water) on the primer/metal interface, dry spray of primer on to the metal (which does not allow the primer to... 

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