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Good adhesion is critical to the integrity and long-term performance of a coating. Poor adhesion can result in failure, corrosion and contamination of surfaces or contents. How can this be achieved quickly and effectively?
Testing adhesive integrity can be undertaken using two basic methods. The first is to use a knife to cut through the coating down the substrate in the shape of an X or several parallel cross cuts. It offers an indication of a potential adhesion issue, which may warrant further investigation. Another other approach is to cement an aluminium dolly onto the coating. This is then pulled away with an adhesion test apparatus used to evaluate the tensile strength of the coating.
A numerical value in pounds per square inch psi or Mega Pascals provides adhesion strength readings. This quantitative approach to testing will identify a failure along the weakest plane S within the costing system and can identify glue failure or intercoat failure.
In particular, the mode s of failure depending upon whether the surface has been abraded, the shape and size of dolly, coating thickness, age, and hardness, and the degree of cure of the coating among several factors. Adhesion testing , coating failure. Dry film thickness. A photograph is worth a thousand words…. Latest News. Coating surveys on offshore platforms. Bridging the coatings gap. Paint blistering explained.
Testing times continued….
Nitto (Permacel) P-99 Polyester/Fiber Packaging Tape [Discontinued]
ASTM D cross h Designation: D — 08 Standard Test Methods for Measuring Adhesion by Tape Test1 This standard is issued under the xed designation D ; the number immediately following the designation indicates the year of original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. A superscript epsilon e indicates an editorial change since the last revision or reapproval. This standard has been approved for use by agencies of the Department of Defense.
P99 Tape is well suited for packaging when governmental specifications are involved, and with difficult to splice materials such as coated wall covering papers and cloths, and polyurethane-coated fabrics. The tape is also frequently used for adhesion peel strength testing. Please note that tape rolls are NOT guaranteed to be splice-free. Polyethylene Film Stucco Masking, Greenhouse, etc. Double-Sided Urethane Foam Mounting, etc. Sign up today to be notified of upcoming deals and exclusive offers!