Adhesion Determinations of Various Polymer Coatings


TEACHER NOTES

Objectives: Students will

Applicable Science Concepts:

Supplies:

Safety:

Manufacturers provide instructions for the use of their products, and these instructions should be followed completely. Protective gloves and lab coats should be used when preparing and handling the glass slides with coatings, and safety glasses should be used at ALL times. EXTREME CAUTION should be used at all times when handling sharp objects!

 

Activity:

Taken from the ASTM Standard Test Method for Film Adhesion by Tape Test: ASTM D 3359 - 90 http://www.astm.org/cgi-bin/SoftCart.exe/BOOKSTORE/COMPS/CONTENTS/71.html?L+mystore+mhth9641

Preparation:

Each group will need one glass slide of each coating obtained from the teacher.

 

Investigation Procedures:
TEST METHOD A – X-Cut Tape Test

TEST METHOD B – Cross-Cut Tape Test

 

Report:

 

Conclusions:
Have groups of students share their data with other groups by putting their data either on the board or on an overhead. Students should discuss why adhesion is important. Where would you use stronger or weaker adhesive coatings? Why? They can then compare the results of the adhesion test to other physical characteristics they have already observed.


OUR TEST RESULTS (TEST METHOD B – Cross-Cut Tape Test)
:

A: Armorall Car Wax – 2B E: Epoxy – 5B
B: 100% Acrylic Latex – 1B F: Krylon Spray Enamel – 1B
C: Oil Based High Gloss Enamel – 0B G: Kilz Spray – 4B
D: Krylon Fusion – 2B H: Kilz in a Can – 3B

 

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