LOCTITE^® PC 7210

How to use

1. Note

Composite repairs according to ISO 24817 or ASME PCC-2 have to be calculated and designed by Henkel. The application process for certified repairs is to be carried out exclusively by qualified personnel trained and approved by Henkel. Please contact your Henkel partner for further information on the requirements of certified repair applications. The following text gives only a brief summary of the application process in general.


2. Surface Preparation

Proper surface preparation is critical to the long-term performance of this product. The exact requirements vary with the severity of the application, expected service life, and initial substrate conditions.


3. Preparation - Cleaning

Remove dirt, oil, grease etc. with a suitable cleaner, e.g. high pressure water cleaning system using LOCTITE^® 7840^™ or LOCTITE^® Natural Blue^® cleaner/degreaser.


4. Preparation - Blasting

Blast all surfaces to be coated with a sharp-edged angular grit to achieve a surface profile depth of 75 to 100 microns (3 to 4 mils) and a cleanliness level of Sa 2.5 to Sa 3.0. After blasting, clean the metal surfaces, for example with LOCTITE SF 7063 or LOCTITE ODC Free Cleaner and Degreaser, and coat them with LOCTITE 7515 before any oxidation or contamination occurs. Metal that has been in contact with salt solutions, such as seawater, should be grit blasted and high-pressure water blasted, then left for 24 hours to allow any salts in the metal to migrate to the surface. A test for chloride contamination should be performed, and the procedure should be repeated until the chloride ion concentration on the surface is below 3 μg/cm².


5. Preparation - Mixing

Add the hardener completely to the resin and mix the material vigorously until it is uniform in color. Continue mixing for an additional 3 to 5 minutes, ensuring that the bottom and sides of the mixing container are thoroughly scraped. Heat build-up during and after mixing is normal. To reduce the likelihood of an exothermic reaction or excessive heat buildup, mix less than 1,000 grams at a time. Mixing smaller quantities will help minimize heat buildup.


6. Preparation - Impregnation

Start the impregnation process immediately after mixing. Thoroughly impregnate the multi-axial, multi-ply fabric, LOCTITE 5085, with the mixed LOCTITE PC 7210.


7. Application

Ensure the component temperature is between 15 and 30 °C (60 to 85 °F). For non-through-wall defects, use LOCTITE EA 3478 to rebuild the external part design. Apply a layer of LOCTITE PC 7210 at least 200 microns (8 mil) thick onto the surface of the repair area using a spatula. Press the impregnated fabric firmly onto the surface, ensuring that no air is trapped between the surface and the fabric. A minimum of two layers is required to seal the surface properly. The application must proceed quickly to avoid exceeding the 30-minute working time (depending on temperature). To improve weathering resistance, fire resistance, or aesthetic appearance, apply a layer of LOCTITE PC 7255 on top by spraying or brushing.


8. Clean up

Immediately after using clean tools with suitable cleaner, e.g. TEROSON^® PU 8550 or BONDERITE^® C-MC 21130. Once cured, the material can only be removed mechanically