Kynar XL (Kynar 500) Information

COMMERCIAL CONSTRUCTION ONLY

"PPG promotes Chrome Phosphate pretreatment for the maximum corrosion protection available. The AAMA 2605 Specification specifies the use of Chrome Phosphate to achieve the highest possible corrosion protection. PPG Duranar (Kynar) requires a primer coat over a Chrome Phosphate pretreatment to give the best possible paint system available for all environments. The use of a primer coat is a must to prevent filiform corrosion. One coat systems will not prevent filiform corrosion, the Europeans have had numerous failures using powder finishes with no primer coats. The seacoast environment is the ideal environment for the formation of filiform corrosion."

Marshell Bishop
Technical Sales/Service Representative
PPG Industries, Inc.

"PPG Duranar (Kynar) liquid spray finishes are recognized worldwide as the leader in high performance, low maintenance coatings. Duranar is covered by a 20-year durability warranty only as a multi-coat system, including a primer coat over a Chrome conversion pretreatment for aluminum substrates (AAMA 2605 requires Chrome pretreatment for compliance). PPG Industries has documented over 30 years of actual outdoor exposure data at our atmospheric testing sites in Florida and on thousands of projects worldwide. PPG Industries does not offer PVDF powder finish (Kynar powder coat) for the extrusion market. From our work in this area, we have found that powder finishes, in general, are subject to extensive filiform corrosion when used as a single coat system without primer. The condition is compounded when a chrome-free pretreatment is employed. Consequently, these single coat finishes are not targeted for the high performance market and they do not pass the AAMA 2605 High Performance Specification."

Gary Altavilla
Technical Manager
Coil and Extrusion Coatings, North America
PPG Industries, Inc.

"The question is whether the titanium non-chromes should be called a paint primer. The answer is no. There is a small amount of chemistry found in all the titanium non-chromes that are in primers, but that would be like calling a wagon a car just because it has four wheels. First, we call them pretreatments or conversion coatings, not primers. Second, titanium non-chromes are not in the marketplace to replace primers. Third, when using two coat Kynar systems, it is required that you use a chrome phosphate pretreatment. Fourth, the coating thickness of all titanium non-chromes is a very small fraction of primers. Fifth, there is little corrosion resistance by these non-chromes. You will need primers and paint to give corrosion resistance. What pretreatments do is adhere paint to the metal."

Don Lopez
Technical Sales Representative
Henkel Surfaces Technologies

"The key is the Chrome Phosphate pretreatment and primer (the primer also has chrome). I am not saying any more than what the major Kynar manufacturers have been saying for years. Kynar has over 30 years of outdoor exposure and testing. "

Fred Dula
Windsor Metal Finishing

Color Coat: The secret of Kynar 500's exceptional weathering properties lies in its molecular structure. The carbon / fluorine bond is one of the strongest molecular bonds. The Kynar 500 resin in combination with highly durable, time tested pigments is the key to the coatings unsurpassed thermal, chemical and ultraviolet resistant properties.

Amorphous Chrome Phosphate Conversion Coating: The chromium phosphate conversion coating provides the ultimate surface protection against corrosion and is an excellent paint anchor.

Color Coat

Aluminum Substrate

LIQUID KYNAR XL



 

POWDER COATING

Kynar XL: The clear polyvinyledine fluoride (PVDF) top coat protects the underlying color pigments from the elements that cause chalking and fade. The lubricity of the finish also encourages abrasive elements to skid off rather than dig in, and this non stick characteristic also is extremely stain and graffiti resistant.

Strontium Chromate Primer: The strontium chromate primer blocks the intrusion of corrosive air borne contaminants to the substrate.
 

Aluminum Substrate

AAMA 2603 and AAMA 2604

• *Chrome Phosphate (conversion coating) not required

• Primer coat not required

• Clear coat not required