Corrosion of Insulation Jacketing

1

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. (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 ITWs 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

6
(No Transcript)
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
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 CanadaAluminum 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

• 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.
• FOR SPECIFICATION DATA SHEETS PLEASE VISIT
• OUR WEBSITE AT WWW.ITWINSULATION.CA