VWFAYP Series Butyl Vapor Barrier Tape is an advanced self-adhesive internal sealing tape designed for the interior side of window and door openings in low-energy and high-performance building envelopes. It provides a high vapor-resistance layer to help prevent indoor moisture vapor from diffusing into the wall cavity.
Used together with an exterior vapor-permeable sealing tape, VWFAYP helps create a proper inside-tight / outside-open window installation detail. It improves airtightness around window and door frames, supports condensation control, and helps reduce unwanted energy loss at critical opening transitions.
| Product Series | VWFAYP Series |
| Product Type | Butyl vapor barrier tape / internal window sealing tape |
| Material | Butyl |
| Typical Application Style | European low-energy window installation |
| Primary Function | Interior vapor control, airtightness, and condensation-risk reduction |
| Model | Specification | Package |
|---|---|---|
| VWFAYP-10023 | 0.10 m × 23 m | 6 rolls / ctn |
| VWFAYP-12023 | 0.12 m × 23 m | 5 rolls / ctn |
| VWFAYP-15023 | 0.15 m × 23 m | 4 rolls / ctn |
| VWFAYP-20023 | 0.20 m × 23 m | 3 rolls / ctn |
Designed for interior-side sealing around windows and doors
Provides high vapor resistance to limit inward moisture diffusion
Improves airtightness around window and door frame transitions
Helps reduce condensation risk in high-performance wall assemblies
Works as the internal sealing layer in European low-energy window installation details
| Test Item | Standard / Method | Condition / Requirement | Test Result |
|---|---|---|---|
| Material | - | - | Butyl |
| Thickness | GB/T 328.5-2007 (Ref. ASTM D3652) | Mechanical measurement, (23±2)°C | 0.69 mm |
| Basis Weight | GB/T 328.5-2007 | - | 558 g/m² |
| Tensile Strength | GB 23441-2009 (Ref. EN 12311-2) | (23±2)°C, 100 mm/min | MD: 296 N/50 mm; CD: 235 N/50 mm |
| Elongation at Maximum Tensile Force | GB 23441-2009 (Ref. EN 12311-2) | (23±2)°C, 100 mm/min | MD: 59%; CD: 82% |
| 180° Peel Adhesion | JC/T 942-2004 | Housewrap, (23±2)°C, 100 mm/min | 0.86 N/mm |
| 180° Peel Adhesion | JC/T 942-2004 | OSB / Board, (23±2)°C, 50 mm/min | 0.40 N/mm |
| 180° Peel Adhesion | JC/T 942-2004 | Aluminum plate, (23±2)°C, 50 mm/min | 0.45 N/mm |
| 180° Peel Adhesion | JC/T 942-2004 | Cement board, (23±2)°C, 50 mm/min | 0.43 N/mm |
| Water Vapor Resistance / Sd Value | GB/T 17146-2015 (Ref. EN 1931) | Test C | Sd ≥ 272 m |
| Water Resistance | GB/T 328.10-2007 | 1000 mm water column, 2 h | No leakage |
| Plaster Surface Adhesion | GB/T 35467-2017 | (23±2)°C, 100 mm/min | 0.70 N/mm |
