Field Adhesion Testing

Cost efficient testing method to evaluate the adhesion compatibility of two different materials.

Field Adhesion Testing Cost efficient testing method to evaluate the adhesion compatibility of two different materials.

 

PROSOCO’s Shawn Desrosier explains a field adhesion testing method to evaluate the adhesion compatibility of two different materials. The simple tool, a modified digital scale that can be made with items

found at your local hardware store, easily provides an answer to the general contractor, consultant or others on the jobsite with adhesion compatibility questions.

 

INSTRUCTIONS

Summary: A luggage scale with attached magnet is connected to a washer that is glued to the material to be tested.

  1. Ensure that the surface to be tested is free of dirt and debris. If necessary, wipe the surface with rubbing alcohol (IPA) to remove surface contaminants. Allow the surface to dry.
  2. Glue the 1-1/4" x 3/16" washer to the membrane to be tested using Loctite Super Glue ULTRA Gel Control. Use  sufficient        adhesive on the washer, so that when the washer is pressed against the flashing or air barrier membrane, adhesive will spread over the entire surface area of the washer’s bond side. Avoid excessive leakage of adhesive outside and inside the washer.
  3. Allow the adhesive to cure for 30 minutes. Use a pin, nail, screw or duct tape to hold the washer on the wall during cure. 
  4. Use a knife to cut around the washer through the flashing or air barrier membrane being tested. Do not cut into the underlying substrate.
  5. Grasp the luggage scale with both hands like a computer game controller or like holding a smartphone for texting.
  6. Free one hand, and place the magnet attached to the luggage scale onto the washer. Return your free hand to the luggage scale.
  7. To avoid injury, DO NOT PULL directly with your arms. Instead, place the outside edge of your hands against the test surface. Grasping the luggage scale between your thumbs and index fingers, twist your hands outward slowly to create a pulling pressure on the magnet and washer.
  8. As soon as the scale reads 20 or over, hold the pull for three seconds until the scale beeps. The word “Hold” will appear as the scale locks in the pounds reading. (With a 1-1/4" x 3/16" washer, the math works out to require a pull to 20 to demonstrate 16psi – which is the standard set by the Air Barrier Association of America.)
  9. Make a record of the reading. Slide the magnet off the washer.

 

Download the Instructions

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