Chemical Welding

Chemical Patching Instructions

Chemically bonded patches work on PVC, and PVC related products. The following instructions detail how chemically welded patches are installed.

 

  1. In order to ensure good seam adhesion with chemical solvents you must ensure that only clean dry surfaces are bonded, and that the temperature is adequate to drive the reaction.
  2. Remove cover soils very carefully to avoid causing further damage to the liner. The liner can then be cleaned using water or soap and water. A commercial cleaning solution can also be used if there is an oily residue on the liner. Dry the liner thoroughly.
  3. The ambient temperature must be at least 10 C to perform a solvent weld using THF. If the temperature is above 4 C but below 10 C, contact us for a bodied THF/MEK blend to use in place of THF. Below 4 C solvent bonding will not be possible without supplying heat to the process.
  4. With older, weathered liner material, it may be necessary to roughen the surface with a medium grit sandpaper, or wipe with clean THF. This will remove the oxidized surface layer and permit better bonding.
  5. Cut a piece of patch material that is 6” larger on all sides than the damaged section. Use patch material that is compatible with the material being repaired. Arctic Liner material can be utilized to repair regular flexible PVC.
  6. Align the patch on the damaged area, ensuring that it conforms to the bonding surface. Work a brush dipped in solvent between the old material and the patch material. Use the solvent liberally and thoroughly wet both surfaces to be bonded, solvent should flow out of the seam and onto the adjacent areas on the liner.
  7. Roll out the patch from the center to the edges using a small roller, or press the patch down and smooth using a rag. A small bead of solvent should press out of the patch seam when pressure is applied. You should now wipe up any excess solvent from the liner surface.
  8. Allow 24 hours curing time (at 20 C) before testing the seam. Test by picking at the edge of the patch with your fingernails, or direct 35 psi air at the edge of the seam. In areas which lift apply more solvent and pressure to the area.
  9. Dispose of used solvent properly. Liquid THF can not be placed in a landfill. Allow small portions of solvent to evaporate. Destroy empty containers so they are not reused.
  10. If you encounter any difficulties with this repair procedure please contact our customer service group.
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