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.

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.

Terminology Two terms often confused Vapor Retarder /Barrier Moisture Retarder

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

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.

MOISTURE RETARDER

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

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.

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

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

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

Galvanic Corrosion Testing Test parameters Materials tested Test results

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

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

Galvanized Steel Bare Removed from test early Zinc coating failed

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

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

Aluminized Steel Corrosion

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

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®

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

Pinhole Testing Test Parameters Test Results

Typical Painted Aluminum Jacketing

Painted Aluminum Jacketing-Thermoclad®

Thermoclad® Plus

Comparison

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

Conclusion Thermoclad® Plus offers superior interior protection

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

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.

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