2007-10-05: New ISO-standard Protection of steel
ISO 16276-2007 is a new standard about corrosion protection of steel structures by protective paint systems The objective of this standard is to achieve uniformity of practice in the assessment of protective coatings and to establish acceptance criteria for the adhesion/cohesion (fracture strength) of a dry film. It differs from ISO 4618, ISO 2409 and ASTM D3359, which are adhesion test methods for general purposes. The new phrase 'fracture strength' regarding adhesion and cohesion is introduced.
PART 1 Pull-off testing.
Different types of adhesion testers can be used for this test, for example the LD9200 Pat Handy. One particular model is usually stated in a job specification because the results obtained from different types of equipment are not always the same. The test procedure to follow is that given by the manufacturer in their instruction book.
The additional requirements of this standard are a sampling plan, interpretation of the results and how a pass or fail is determined.
The Adhesion Sampling Plan describes the number of samples that has to be taken:3 samples per 250 m2 area for area’s smaller than 1000m2; on larger area’s 12 plus 1 additional sample for every 1000m2 area.
PART 2 Cross-cut testing and X-cut testing
Section 6.4 is the Cross-cut test for coatings up to 250 microns thick, using the method and rating in ISO 2409 (2 or 3mm lattice). TQC Cross Cut testers are the CC1000, CC2000 and CC3000 Section 6.5 is the X-cut test, that can be performed using the Master Paint Plate (SP3000).
For part 2 the sampling plan is 1 per 200m² area for area’s smaller than 1000m2; For larger area’s 5 plus 1 per additional 1000m².
