Powder coating of aluminium profiles in Jordan, PVDF Coating & Wood Finish Coating in Jorda

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PVDF Coating

PVDF Coating

Specifications for PVDF Coatings on Architectural Aluminum

Finishes

The PVDF Coating System

Performance Properties

Acceptable PVDF Coatings

General

Warranty

 

Specifications for PVDF Coatings on Architectural Aluminum:

  1. PVDF coatings for all aluminum extrusions, panels, etc. shall be a Fluoropolymer, Polyvinylidene fluoride coating based on a minimum of 70% Kynar500â or Hylar5000â resin fully complying with AAMA 2605 specifications.
  2. Coating shall be a factory applied liquid paint in a 2-coat system comprising of primer and solid or pearlescent color according to architect’s choice.  Coating shall be applied on a chromium pre-treated aluminum substrate and oven baked to a dry film thickness of 30 microns minimum. Alternately in a 3-coat system comprising of primer, color coat and clear lacquer, to a dry film thickness of 40 microns minimum.
  3. Performance properties of PVDF coatings shall be in accordance to AAMA 2605, including South Florida, USA, weathering resistance for a period of 10 years.
  4. Acceptable coatings shall be FLUROPONâ (solid colors) or FLUROPON CLASSICâ II (pearlescent colors) from The Valspar Corporation USA.
  5. PVDF coatings shall be applied by the manufacturer’s licensed applicator and shall carry a warranty for 20 years confirming compliance to AAMA 2605 specifications.

 

 

Finishes

  1. PVDF Coating: (For all internal and external Aluminum works)
  1. Superior performance organic coating for aluminum extrusions, panels and related components shall be a PVDF coating (Polyvinylidene Fluoride coating) based on a minimum of 70% Kynar 500â or Hylar 5000â resin fully complying with AAMA 2605 specifications.
  2. PVDF coating shall be formulated by licensed manufacturer and applied by manufacturer’s approved applicator.  Approved applicator certificate shall be submitted when requested.
  3. PVDF coating shall be factory applied by spray application method, on chemically pre-treated aluminum by conversion chromate coating process in compliance of ASTM D 1730, Type B, Method 5 or Method 7.

A chromium pre-treated aluminum substrate will be with the following specifications:

  1. Degreasing and Etching Tank: Etching rate > 1g/M².
  2. Water Rinsing Tank.
  3. Water Rinsing Tank.
  4. Chrome Tank : Conversion weight =0.6-1.2 g/M²)
  5. Water Rinsing Tank.
  6. DI Water Rinsing Tank: the conductivity for this stage should be below 30 µS.

 

The PVDF Coating System

  • The coating shall be a 2-coat system (solid or pearlescent colour) as per engineer’s approval.
  • The first coat shall consist of a corrosion inhibitive primer (dry film thickness of 5 microns or 0.25 mils minimum) followed by the second coat of approved colour (dry film thickness of 25 microns or 1.0 mils minimum).
  • The total dry film thickness of the coating shall be a minimum of 30 microns or 1.2 mils. 

  • In case the colour selected by the engineer requires a protective clear lacquer (3-coat system) the final coat shall be of clear lacquer coat (dry film thickness of 10 microns minimum) and the total system dry film thickness of the coating shall be a minimum of 40 microns or 1.6 mils.

  • Barrier coat will be used for the colors which having Poor UV resistance when a color contains certain aluminum flakes and for some of the dark colors. Barrier coat can also be recommended to satisfy special film build specifications (i.e. falling sand and to achieve coating thickness specified).

  • The coating shall be thermo cured (oven-baked) as per manufacturer’s standard application procedures.

 

Performance Properties

 

PVDF coating shall comply with the following:

 

  1. Colour Uniformity – Coatings shall be visibly free from flow lines, streaks, blisters or other surface imperfections in the dry film state on exposed surfaces. Colour uniformity shall be consistent with the colour range as established between the approval source and the applicator by reference samples.
  2. Specular Gloss – The gloss values shall be within plus or minus 5 units of the manufacturer’s specification and measured in accordance to  ASTM D 523 using a 60 degrees gloss meter.
  3. Dry Film Hardness – F minimum in accordance to ASTM D 3363.
  4. Abrasion Resistance – No removal of film when tested by the Falling Sand test method as per ASTM D 968 and the Abrasion Coefficient Value shall be 40 minimum.
  5. Salt Spray Resistance – 4000 hours according to ASTM B 117 using a 5% salt solution. Minimum scribe rating of 7 and blister rating of 8.
  6. Humidity Resistance – 4000 hours according to ASTM D 2247 or ASTM D 4585. No formations of blisters to the extent greater than “Few” blisters size No. 8 (as shown in figure No. 4, ASTM D 714)
  7. Weathering Resistance – Engineer shall request data relative to the long term durability of the coating, based on samples exposed for a minimum period of 10 (ten) years on-fence testing at South Florida, USA, latitude 27 degrees North at a 45 degree angle facing South. The performance properties shall be:
  8. Colour Retention – Maximum of 5 Delta E Units (Hunter) colour change after the weathering exposure minimum of 10 years, as calculated in accordance with ASTM D 2244
  9. Chalk Resistance – Maximum rating no. 8 after the weathering exposure minimum of 10 years, as determined by ASTM D 4214.
  10. Resistance to Erosion – Maximum 10% film loss after the weathering exposure minimum of 10 years, as determined by ASTM B 244.
  11. Gloss Retention – Minimum of 50% gloss retention after the weathering exposure minimum of 10 years, as determined by ASTM D 523.

 

Acceptable PVDF Coatings

 

FLUROPONâ or FLUROPON CLASSICâ II as manufactured by The Valspar Corporation

 

General

 

  1. All coated materials shall be duly protected.
  2. Materials with damaged finishes shall not be incorporated into the work. PVDF coated materials with minor areas of damage after installation, shall be touched up in accordance with the manufacturer’s recommendations.

 

Warranty

A 10 year warranty complying the PVDF coating as per AAMA 2605 specifications shall be issued by the coating applicator and a 20 year warranty shall be issued by the coating manufacturer

 

 

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