ROWAFLON
PVDF topcoats and UV protection primers for architectural membrane. Filters more than 80 percent of the UV in sunlight while visible transparency stays above 70 percent.
PVDF topcoats and UV protection primers for architectural membrane. Filters more than 80 percent of the UV in sunlight while visible transparency stays above 70 percent.
ROWAFLON is ROWA Lack's PVDF family. The resin is a modified polyvinylidene fluoride copolymer, and it goes on PVC-coated architectural membrane, halls and tents, premium pool liner and automotive foil. Twelve grades are published.
PVDF is chosen where the exposure runs harder than an acrylic covers. The film holds gloss and color under long outdoor UV, sheds soil, and resists the heat yellowing that shows up on automotive interior foil.
Architectural membrane fails at the interface before it fails in the film. Intense UV damages the PVC boundary layer underneath the lacquer, and that damage can break the bond between the lacquer and the PVC surface. The coating is still intact and the membrane has still failed.
ROWA answers that with two layers. A UV protection primer goes down first and reflects or absorbs the radiation before it reaches the PVC, and a topcoat goes over it. ROWA's published figure for the system is more than 80 percent of the UV in sunlight filtered out, with transparency in the visible range still above 70 percent.
The primer comes in two absorber chemistries. G-75368 uses titanium dioxide. G-75369 and G-75370 use zinc oxide, and G-75370 is the very transparent version for a membrane that has to stay clear. Solids run from 11.0 to 22.0 percent across the family.
| Property | Typical value |
|---|---|
| Chemistry | Modified PVDF copolymer |
| Delivery form | Solution, solventborne or waterborne |
| Solids content | 11.0 to 22.0 percent depending on grade |
| UV filtered by the primer and topcoat system | More than 80 percent of the UV in sunlight |
| Visible-range transparency of that system | Above 70 percent |
| UV absorbers offered | Titanium dioxide (G-75368) or zinc oxide (G-75369, G-75370) |
| Solvents used | MEK, PMA, acetone and cyclohexanone in the solvent grades; water with EDG in the waterborne grades |
| Published grades | 12 |
| SVHC status | SVHC-free across the published range |
Dosage: Applied as a coating. Primer film build is not less than 5 to 7 g per square meter dry, topcoat typically 4 to 5 g per square meter dry. Confirm against the data sheet for the grade.
Typical values from the manufacturer's technical data sheet. They describe the product, they are not a specification. We will send the current TDS and the batch documentation your qualification needs.
Tell us the binder system, the property you are targeting, and the volume you expect. We will confirm the grade, send the documentation, and get a sample of the candidate grade to you.
G-75368 (TiO2), G-75369 and G-75370 (ZnO, G-75370 very transparent) as UV protection primers, with G-75281 and G-75428 as the matching topcoats.
G-75277 and G-75372 in solvent, G-75081W waterborne, G-71711 as a topcoat over a UV protection primer.
G-75409 for the high-grade gloss liner, where chlorine or salt water runs alongside daily UV and the plasticizer barrier matters.
M-74828W and M-74881W, both waterborne and matt, with very good resistance to heat yellowing. M-74881W adds the anti-squeak surface.
It is specified where the formulation needs weathering and gloss retention beyond what an acrylic film gives, low soiling tendency on exposed membrane, UV protection of the PVC boundary layer under the coating, very good resistance to heat yellowing on automotive foil, anti-squeak surface on the M-74881W grade, and plasticizer barrier effect on the pool liner grade.
Stir well before use and filter before application. Rotogravure and magnet bar are the application methods.
Drying is about one minute at 140 to 160 degrees C on the grades whose data sheets we hold, hotter than the acrylic range needs.
Most ROWAFLON topcoats want a primer underneath and will say so on the data sheet, and several are crosslinkable with a ROWASET addition capped at a low percentage. Take both from the sheet for the grade, since they are not uniform across the family.
The two-layer UV system is primer first at a minimum dry film build, then topcoat. Skipping the primer puts the PVC boundary layer back in direct sunlight, which is the failure the system exists to prevent.
Package sizes: Made to order in the pack size the run needs. Tell us the volume and we will confirm.
Storage: Dry, at room temperature, in the original airtight container. Shelf life is 6 months in the sealed original pack on the grades whose data sheets we hold. Confirm the figure on the current data sheet for your grade.
Every grade in ROWA's published ROWAFLON range is SVHC-free. Refer to the current safety data sheet for hazard classification and handling. Several solvent grades carry dimethylformamide or dimethylacetamide as a diluent, so read the sheet before setting up the line.
Because the membrane usually fails at the interface, not in the film. UV gets through and damages the PVC boundary layer sitting under the lacquer, and once that layer is degraded the bond between the lacquer and the PVC can go with it. The primer stops the radiation before it reaches the PVC. ROWA's published figure for the primer and topcoat system is more than 80 percent of the UV in sunlight filtered, with visible transparency still above 70 percent.
Titanium dioxide in G-75368 and zinc oxide in G-75369 and G-75370. The choice usually comes down to how transparent the finished membrane has to be, which is why G-75370 exists as the very transparent zinc oxide version. Tell us the appearance target and we will point at the grade.
Not as a rule. The sheets on the tensile-structure grades we hold state not HF-weldable and call for a primer. If the fabricator needs to weld the finished material, that constrains the grade choice and it needs to be on the table before the trial, not after.
When the exposure is long and outdoor and the appearance has to hold: tensile membrane, halls and tents, a pool liner that sees chlorine and daily sun. On a truck curtain replaced on a normal cycle an acrylic does the job. The comparison across the three chemistries is on the topcoat selection guide.
Interior foils rub against each other and against trim under vibration, and the noise that produces is a warranty issue. M-74881W is formulated so the surface slips instead of sticking and releasing, which is what the squeak is.
Yes. We send the Technical Data Sheet (TDS), Safety Data Sheet (SDS), SVHC statement, and ISO 9001 certificate on request, in the manufacturer's current revision. Use Request TDS or SDS above and tell us what your qualification review needs.
The full ROWA Lack range PAT supplies and what each chemistry is for.
Why the membrane fails at the interface, and how the two-layer system answers it.
When PVDF earns its cost against an acrylic.