2. Welcome
The objective is to provide the best recommendation to diminish the possibility of corrosion at the metal and insulation interface.
Explanation on the differences between moisture retarder and vapor barrier.

3. Show the results of corrosion tests done on multiple bare metals
Show the results of corrosion tests done on multiple bare metals. (Galvanic Test)
Show the results of corrosion tests done on multiple bare metals laminated with polysurlyn moisture retarder.
Show the results of corrosion test done on painted moisture retarders. (Pinhole Test)
Introduce ITW’s recommended solution.

4. Terminology Two terms often confused Vapor Retarder /Barrier
Moisture Retarder

5. Vapor Retarder/ Barrier
Definition- A material used to prevent moisture vapor in the atmosphere from reaching the insulation on cold work.
System operating below ambient temperature: vapor drive is toward the cold pipe and equipment
Vapor barrier properly applied to warm side of insulation can minimize problems

7. Moisture Retarder
Definition- A material, usually Polysurlyn®, which is heat laminated to the inner surface of metal jacketing to keep moisture from contacting the metal jacket in order to prevent corrosion of the jacket.
Function is really corrosion retarder.

8. MOISTURE RETARDER

9. Moisture
Entrapped between the insulation jacket and the insulation may function as weak electrolyte.
This condition may set up galvanic corrosion
Important to keep insulation and exterior of vapor retarder dry

10. Job Site Conditions
May be difficult to insure that insulation and vapor retarder dry before applying insulation jacketing
We always recommend a Polysurlyn® moisture retarder. The insulation jacketing may come into contact with excessive amounts of moisture at anytime.

11. Standard Moisture Retarders
Polysurlyn® - a three layer co extruded film
Paint – of different types

12. GOAL
Provide the best recommendation to diminish the possible interior corrosion of insulation jacketing installed by you or your customers

13. Corrosion of Insulation Jacketing
Metal Types
- All
Differentiation
- Based on user specification
-Job Site environment

14. Galvanic Corrosion Testing
Test parameters
Materials tested
Test results

15. Aluminum 3000 Series Bare
Corrosion on the inside of the unprotected aluminum 3000 series jacket.

16. Aluminum 3000 series Bare
Corrosion Pits
Corrosion on the inside of the unprotected aluminum 3000 series jacket.

17. Galvanized Steel Bare
Removed from test early
Zinc coating failed

18. Galvanized Steel Bare
Corrosion on the inside of the galvanized steel jacket

19. Zinc/aluminum coated steel
Red corrosion on the interior of a zinc/aluminum steel jacket.

20. Aluminized Steel
Corrosion

21. Aluminum 3000 series w/PSMR
Aluminum 3000 series H14 jacket with no corrosion

22. Zinc/aluminum coated steel w/PSMR
Figure depicts a galvalume steel jacket with a polysurlyn moisture retarder. This material also performed extremely well during the test. The polysurlyn protected the galvalume, which is dramatic when comparing photo to photo. The polysurlyn moisture barrier on the gavlalume steel was stained, but a thorough inspection revealed that it remained intact and unaffected by the test.
Zinc/aluminum steel jacket with Polysurlyn®

23. Conclusion Bare metal -All corrodes Polysurlyn®
- No evidence of corrosion

24. Pinhole Testing
Test Parameters
Test Results

25. Typical Painted Aluminum Jacketing

26. Painted Aluminum Jacketing-Thermoclad®

27. Thermoclad® Plus

28. Comparison

29. Pin Hole Test Results
ALL paint type moisture retarders tested have pin holes
Thermoclad® Plus has no pinholes

30. Conclusion
Thermoclad® Plus offers superior interior protection

31. Recommendations
Polysurlyn® moisture retarder is recommended for all types of metal jacketing as best practice
Polysurlyn® shall be 3 mil thickness, 3 layer co-extruded film, factory heat laminated to metal jacketing

32. ITW Insulation Systems Canada Aluminum Jacketing Products
We will offer two Products:
GOOD
Aluminum with Polysurlyn Moisture Retarder.
Exterior: Bare Aluminum
Interior: 3 mil thickness 3 layer co-extruded Polysurlyn factory heat laminated to metal jacketing.

33. Exterior: 0.4 mil clear un-tinted coil coated thermosetting enamel.
BEST
THERMOCLAD PLUS ®
Exterior: 0.4 mil clear un-tinted coil coated thermosetting enamel.
Interior: 0.6 mil laminate grade coil coated thermosetting enamel covered by a 3 mil thickness 3 layer co-extruded polysurlyn factory heat laminated over the enamel undercoat.
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