9425FR SealDry Lightweight PU Moisture Barrier Tape
FAR 25.853(a) · Appendix F · Part I(a)(1)(ii) Boeing — BMS 8-346 Rev. E · Type I · Class 3 Airbus — A2MS 535-007 Rev. A · Type VI Bombardier / de Havilland — BAMS 535-007 Rev. B · Type VI
- FAR 25.853(a)
- Appendix F
- Part I(a)(1)(ii) Boeing — BMS 8-346 Rev. E
- COC Included
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Patco 9425FR SealDry is a 6.0 mil clear polyurethane film interior moisture barrier and corrosion protective tape — the lightweight barrier film used in interior aircraft sections exposed to moisture, including galleys, lavatories and entryways, and for seat track protection, cargo area moisture protection and floor seam sealing. It is approved to Boeing BMS 8-346 Rev. E, Type I, Class 3, Airbus A2MS 535-007 Rev. A, Type VI, Bombardier/de Havilland BAMS 535-007 Rev. B, Type VI, and FAR 25.853(a), tested with a 4.56" average burn length, zero flame time and zero drip. At 5.0 oz/sq yd it is one of the lightest barrier tapes available, and the self-extinguishing film contains no plasticizers or PBDEs. The hydrophobic acrylic adhesive is repositionable, mold and fungus resistant, and removes cleanly without residue. Available in Clear in 2", 3", 24" and 48" widths on 36-yard rolls with a die-cuttable blue HDPE liner, and in incremental slit widths on request.
Key Features of Patco 9425FR Moisture Barrier Tape
- Boeing BMS 8-346 Type I, Class 3 — The Class 3 qualification, for callouts where a Class 1 waterseal tape cannot be substituted
- 5.0 oz/sq yd lightweight construction — Significant weight savings over heavier barrier tapes across a large installed area
- Hydrophobic acrylic adhesive — Mold and fungus resistant, repositionable during install, and removes cleanly with no residue
- Self-extinguishing, no plasticizers or PBDEs — 4.56" average burn length against an 8.0" limit, with zero flame time and zero drip
- Broad OEM approval — Boeing, Airbus, Bombardier/de Havilland and the FAA
What Is Patco 9425FR Used For?
- Moisture barrier in galleys, lavatories and entryways
- Aircraft corrosion protection on interior structure
- Aircraft seat track protection
- Cargo area and cargo lining moisture protection
- Floor seam protection in wet areas of the aircraft
- Abrasion guard on interior panels, structure and high-wear contact points
- Die-cut moisture barrier patches for fasteners, lap joints and fittings
Key Specifications
| Product construction | Single-coated tape Carrier — PU (polyurethane) film, self-extinguishing Adhesive — Hydrophobic acrylic (single-coated) Liner — Blue HDPE film liner (die-cuttable) Total thickness — 6.0 mil (0.152 mm) Weight — 5.0 oz/sq yd (169.53 g/m²) Tensile strength — 34 lb/in (59.54 N/cm) Adhesion to steel — 28 oz/in (3.06 N/cm) Elongation — 550% Operating temperature — −10°F to 250°F (−23°C to 121°C) Burn length — 4.56 in average — FAR 25.853(a) App. F Pt. I(a)(1)(ii) Flame time — 0 seconds Drip time — 0 seconds Colors — Clear (transparent) Performance — Flame retardant, self-extinguishing; moisture barrier; corrosion protective; abrasion resistant; mold and fungus resistant; repositionable; no plasticizers or PBDEs Shelf life — 24 months from date of manufacture, stored at 40–80°F in the original dry carton, off the floor, in a well ventilated area Manufacturer P/N — Patco 9425FR (also 9425) Brand — Patco (Vybond / Berry) Country of Origin — United States |
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Why This Tape Matches Your Spec
Boeing BMS 8-346 classifies polyurethane film tape by Type and Class. Type I is the tough polyurethane film with a pressure-sensitive adhesive used for moisture sealing in aircraft interiors. The Class then sets the performance grade. Class 3 — Patco 9425FR. Class 3 is the higher-grade class within BMS 8-346, and 9425FR is qualified to Type I, Class 3 under Revision E. A Class 1 tape cannot be substituted where a drawing calls out Class 3. Class 1 — Patco D9100. D9100 is qualified to Type I and Type II, Class 1, the standard waterseal class, and is the common requirement for floor joint sealing in galleys, lavatories and entryways. Beyond Boeing, 9425FR also holds Airbus A2MS 535-007 Rev. A, Type VI and Bombardier/de Havilland BAMS 535-007 Rev. B, Type VI — the equivalent moisture barrier callouts on those airframes — plus FAR 25.853(a) for interior flammability. If your drawing calls out BMS 8-346 Class 3, A2MS 535-007 Type VI, or BAMS 535-007 Type VI, 9425FR is the product. If it calls out BMS 8-346 Class 1, specify D9100.
- Moisture barrier in galleys, lavatories and entryways
- Aircraft corrosion protection on interior structure
- Aircraft seat track protection
- Cargo area and cargo lining moisture protection
- Floor seam protection in wet areas of the aircraft
- Abrasion guard on interior panels, structure and high-wear contact points
- Die-cut moisture barrier patches for fasteners, lap joints and fittings
Approvals & Certifications
Available Sizes
Spec Guide
Frequently Asked Questions
What is Patco 9425FR used for?
Patco 9425FR is an interior moisture barrier and corrosion protective tape used for aircraft corrosion protection, seat track protection, cargo area moisture protection, floor seam protection in wet areas, and as an abrasion guard on interior structure and panels.
What is the difference between Patco 9425FR and Patco D9100?
Both are polyurethane film tapes under Boeing BMS 8-346, but they hold different classes. 9425FR is qualified to Type I, Class 3. D9100 is qualified to Type I and Type II, Class 1, the standard waterseal class. A Class 1 tape cannot be substituted where Class 3 is specified, so match the class on your drawing.
Is Patco 9425FR flame retardant?
Yes. The polyurethane film is self-extinguishing and the product complies with FAR 25.853(a), tested to Appendix F, Part I(a)(1)(ii). Certified results are 4.56 inches average burn length against an 8.0 inch limit, with zero flame time and zero drip time.
Does Patco 9425FR contain plasticizers or PBDEs?
No. The polyurethane film backing is formulated without plasticizers and without PBDEs (polybrominated diphenyl ethers), which is often a requirement for aircraft interior materials.
Is Patco 9425FR removable, and will it leave residue?
The hydrophobic acrylic adhesive is repositionable during installation and formulated for clean removal without residue. It is also mold and fungus resistant, which matters in the damp areas this tape is designed for.
What is the shelf life of Patco 9425FR?
24 months from the date of manufacture when stored between 40 and 80°F in the original dry carton, off the floor, in a well ventilated area. Berry guarantees a minimum of 12 months storage life remaining at the time of shipment.
What sizes does Patco 9425FR come in, and is there a minimum order?
2", 3", 24" and 48" widths, all on 36-yard rolls in Clear. The 2" and 3" widths have a 3-roll minimum order; the 24" and 48" wide rolls are sold singly. Other sizes are available on request.
Can you supply a Certificate of Conformance for Patco 9425FR?
Yes. Berry issues a lot-specific Certification of Compliance covering FAR 25.853(a), BMS 8-346, BAMS 535-007 and A2MS 535-007, with the flammability test data attached. It is included with orders where available.