VWFHYP Series Butyl Vapor Permeable Tape is a premium self-adhesive exterior sealing tape designed for window and door openings in low-energy and high-performance building envelopes. Applied to the outside of windows and doors, it helps block liquid water intrusion while allowing trapped moisture vapor to escape from the wall assembly.
As an external vapor-permeable flashing tape, VWFHYP supports outward drying and helps reduce condensation risk around window and door details. It is especially suitable for European low-energy window installation methods where the exterior side must remain weather-resistant, airtight, and vapor-open.
| Product Series | VWFHYP Series |
| Product Type | Butyl vapor permeable tape / external window sealing tape |
| Material | Butyl |
| Typical Application Style | European low-energy window installation |
| Primary Function | Exterior waterproofing, airtightness, and outward vapor diffusion |
| Model | Specification | Package |
|---|---|---|
| VWFHYP-10023 | 0.10 m × 23 m | 6 rolls / ctn |
| VWFHYP-12023 | 0.12 m × 23 m | 5 rolls / ctn |
| VWFHYP-15023 | 0.15 m × 23 m | 4 rolls / ctn |
| VWFHYP-20023 | 0.20 m × 23 m | 3 rolls / ctn |
Designed for exterior-side sealing around windows and doors
Blocks liquid water while allowing moisture vapor to escape
Helps reduce condensation risk around opening details
Supports European low-energy window installation methods
Improves continuity of the exterior weather-resistive barrier layer
| Test Item | Standard / Method | Condition / Requirement | Test Result |
|---|---|---|---|
| Material | - | - | Butyl |
| Thickness | GB/T 328.5-2007 (Ref. ASTM D3652) | Mechanical measurement, (23±2)°C | 0.73 mm |
| Basis Weight | GB/T 328.5-2007 | - | 481 g/m² |
| Tensile Strength | GB 23441-2009 (Ref. EN 12311-2) | (23±2)°C, 100 mm/min | MD: 280 N/50 mm; CD: 246 N/50 mm |
| Elongation at Maximum Tensile Force | GB 23441-2009 (Ref. EN 12311-2) | (23±2)°C, 100 mm/min | MD: 61%; CD: 72% |
| 180° Peel Adhesion | JC/T 942-2004 | Housewrap, (23±2)°C, 100 mm/min | 0.63 N/mm |
| 180° Peel Adhesion | JC/T 942-2004 | OSB / Board, (23±2)°C, 50 mm/min | 0.41 N/mm |
| 180° Peel Adhesion | JC/T 942-2004 | Aluminum plate, (23±2)°C, 50 mm/min | 0.41 N/mm |
| 180° Peel Adhesion | JC/T 942-2004 | Cement board, (23±2)°C, 50 mm/min | 0.40 N/mm |
| Water Vapor Resistance / Sd Value | GB/T 17146-2015 (Ref. EN 1931) | Test C | Sd ≤ 0.13 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 | 0.90 N/mm |
