DANAFLON®
Polyvinyl fluoride (PVF) Coil Coating for Steel

         DuPont™  invented the polyvinyl fluoride (PVF) polymer in the 1940s and by the 1950s began developing products based on the material. In 1961, DuPont registered the Tedlar® brand name in the US and construction started on its first production facility. More than fifty years later, Tedlar® film is recognized as the high-performance standard in the range of industries it serves with proven durability in harsh operating environments.
          On the basis of the long-term business relationship, Pao Qun has succeeded in formulating Polyvinyl fluoride (PVF) coating for coil steel with patented technology, know-how and the support from DuPont™. Polyvinyl fluoride (PVF) coil coating for steel is two-coats system-primer and topcoat and topcoat is 100% made from Polyvinyl fluoride (PVF) resin. To compare with PVDF fluorocarbon resin coating film, PVF coating film has shown excellent weatherability, corrosion-resistance, chemical resistance, abrasion resistance, anti-dirty and post-forming properties.

Here is the property comparison of PVF and PVDF coating film:

Items  PVF coating film PVDF coating film Standards
1 Film thickness 30μm 26μm ASTM D 7091-13
2 Gloss（60°） 30~35 20~25 ASTM D 523(60°)，Medium 20-79°
3 Dry film hardness F~H H+ ASTM D 3363，Mitsubishi pencil
4 Adhesion Dry 100/100 100/100 100/100 ASTM D 3359，18-27℃
Boiling Water 1Hr100/100 100/100 100/100 ASTM D 3359，99-100*24Hrs
5. Impact front 1500g No cracks in the film 500g Cracks in the film ASTM D2794 – 93 1/8’’ R, 500g/1000g/1500g×50cm
back 1500g
No cracks in the film		 500g
Cracks in the film		 ASTM D2794 – 93
1/8’’ R, 500g/1000g/1500g×50cm
6 Abrasion resistance
(Falling Sand)		 110L/mil 70L/mil ASTM D 968
Abrasion Coefficient>40 L/mil
7 Acid resistance(5% HCl) 400Hr
No change		 168Hr
Blistering		 JIS K 5400
8 Alkali resistance(10% NaOH) 900Hr
No change		 336Hr
Severe blistering		 JIS K 5400
9 Acid resistance(10% H2SO4) 900Hr, No change 672Hr, Blistering JIS K 5400
10 Mortar test 24Hr No film loss
No residue		 No film loss
No residue		 ASTM C 207，38℃，R:100%,
11 Detergent test 72 hours No blistering
No film damage		 No blistering
No film damage		 ASTM D 2248
Immerse 3% detergent at 38℃
(Detergent formula ASTM D 3359)
12 Window cleaner resistance 24 hours No blistering
No film damage		 No blistering
No film damage		 18-27℃，(AAMA-2605-13 )
13 Humidity resistance
4000hrs		 No blistering
No film damage		 No blistering
No film damage		 ASTM D 2247，38℃，HR:100%
14 Salt spray resistance >4000Hr >4000Hr ASTM B 117 ASTM D 1654
15 QUVB weather test 4000Hr，△E<2 4000Hr，△E<2 ASTM G 154
16 MEK resistance 500 times
No damage		 200 times
Surface damage & gloss loss		 ASTM D 5402
17 Bending test 0TT/0TC 2-3TT/2-3TC ASTM D4145
18 Acid resistance(5% HCl)
after bending test		 0T, 336Hr,
No blistering		 2T, 48Hr, Blistering JIS K 5400
19 Alkali resistance (10%NaOH) after bending test 0T, 336Hr
No blistering		 2T, 48Hr
Blistering		 JIS K 5400
20 Ericson test 6mm No surface change Topcoat had cracks ASTM E 643
21 Fluoropolymer percent in topcoat resin 100% 70%

★    The compared samples were form commercially available PVDF coil steel products.
Excellent properties of PVF coating film:
1.Excellent chemical resistances to hydrochloric acid, sulfuric acid and sodium hydroxide.
2.Excellent solvent resistance: PVF is unsolvable in most of solvents in room temperature; so that PVF film’s solvent resistance is better than commercially available PVDF film.
3.Excellent abrasion resistance: 100% PVF film’ s abrasion coefficient is higher than commercially available PVDF film.
4.Excellent post-forming (fabricability) property. PVF film has good chemical resistances after 0T bending test.