Passive Purple External Brush: Precise Airtight & Waterproof Sealing for Every Detail - Brush Applied Airtight Facade Membrane
Verified by manufacturer 4 days ago
PASSIVE PURPLE® EXTERNAL BRUSH
Vapour-open, fire-resistant airtight membrane for internal and external use. Suitable for all construction types, from timber frame weather barriers to internal airtightness on masonry.
Application
Product Application – Passive Purple External Brush
The Passive Purple External Brush is a brush-applied airtight membrane designed for sealing detailed junctions, penetrations, and small areas where spray application is not practical. Once cured, it forms a durable, seamless airtight barrier suitable for a wide range of construction substrates.
Suitable Substrates
- Concrete and cementitious surfaces
- Masonry and blockwork
- Timber and engineered wood
- Plasterboard and gypsum
- Steel decks and curtain wall interfaces
- Existing coated or painted substrates (sound, stable surfaces only)
Directions for Use
- Preparation
- Remove dust, dirt, grease, efflorescence, loose material, and standing water.
- Ensure all substrates are clean, sound, and dry-to-damp (not wet).
- Fill large gaps or holes with a fast-setting cement-based filler or polyurethane foam if required.
- Application Conditions
- Apply only when the substrate and ambient temperature is above 5°C.
- Application on slightly damp substrates is permitted, but standing water must be removed.
- Application Method
- Apply directly with a brush, working well into corners, penetrations, and junctions.
- Use one or two coats, depending on the detail and surface porosity.
- Allow the first coat to dry completely before applying the second.
- Aftercare
- Clean all tools immediately with water after use.
- Once cured, the membrane provides long-term airtightness and detailing protection.
Key Application Benefits
- Precise detailing on challenging junctions and penetrations
- Excellent adhesion to multiple substrates
- Flexible, seamless airtight finish
- Compatible with spray-applied Passive Purple External spray for full system continuity
Description
Passive Purple External Brush – Precision Airtight Detailing
The Passive Purple External Brush is a high-performance, brush-applied airtight membrane designed for accurate detailing and small, hard-to-reach areas where spray application is not suitable. It delivers airtight continuity, moisture protection, and long-term durability, making it ideal for both new build and retrofit projects.
Why Choose Passive Purple External Brush?
- Enhanced Airtightness – reduces air leakage and heat loss, improving building performance.
- Precise Application – brush-applied for sealing joints, penetrations, and junctions.
- Durable & Flexible – UV-resistant, crack-bridging, and suitable for internal or external use.
- Fire Rated – achieves Class B to EN 13501-1:2018.
- Safe & Sustainable – VOC-free and ready to use.
Typical Applications
- Floor-to-wall and wall-to-ceiling connections
- Window-to-wall junctions
- Pipe and service penetrations
- Vertical and horizontal joints
- Curtain wall interfaces
- Roof and deck detailing
Key Features & Benefits
- Ready-to-use brush-applied solution
- Airtight and watertight barrier
- VOC-free, no harmful chemicals
- Flexible with no cracking or bending
- Compatible with Passive Purple and Airtight White for a complete airtight system
- Cost-effective detailing solution for Passivhaus and Net Zero projects
For reliable airtight detailing and long-term performance, choose Passive Purple External Brush – the ultimate airtight membrane for precision application.
General information
Color | Black Purple Grey Other White Manufacturer guidanceOther colours are available upon request. Consult manufacturer for details. |
Finish | Other |
Material | Polymer |
Shape | Other Formless |
Length | Bespoke |
Width | Bespoke |
Height | Bespoke |
Warranty description | 25 year |
Uniclass | |
CAWS | H30/30 Air and vapour control membrane H30/261 Air and vapour control membrane H31/261 Air and vapour control membrane H31/45 Air and vapour control membrane P10/60 Air and vapour control layer P10/310 Air and vapour control layer |
SKU Code | IM/00PPEB5 |
Product range |
Specification data - Plastics sheets
Classification data | |
Product reference | Passive Purple External Brush: Precise Airtight & Waterproof Sealing for Every Detail. |
Material | Polymer. |
Purpose | Weatherproof breather membrane. |
Standard | To BS EN 16302, BS EN ISO 12572 and BS EN ISO 4624. |
Performance characteristics | |
Tensile strength (minimum) | 38/ 35 N/50mm (after ageing). ICC-NTA flatwise tensile strength to ASTM E84-21A, all substrates met ICC-ES AC212 criteria for acceptance; 188 PSI (plywood), 186 PSI (cement mortar). |
Tear resistance | To NBN EN ISO 12311, 38/ 35 N/50 mm. |
Elongation to break | To NBN EN ISO 12311-1, >40%. Manufacturer guidanceElongation after ageing. |
Resistant to underground gases | Carbon dioxide permeability to EN1062-2, SD >75 m (Class C1). To EN1504-2, Pass. |
Water vapour resistance (minimum) | μ-value to EN ISO 12572, 2486. Sd-value to EN ISO 12572, 0.6–1. Guidance for specification option: Sd-value calculated based on a consumption of 0.6–0.8 kg/m². |
Fire performance | To EN 13501-1, Class B. To ASTM E84-21A, Class A. |
UV stabilization | UV and weather resistance to EN ISO 16474-3, Pass. Manufacturer guidanceConsult manufacturer for certification. |
Anti-static properties | Required. |
Environmental performance requirements | |
Volatile organic compounds (VOC) emissions level (maximum) | VOC free. |
Recycled contentAs defined in clause 7.8 of BS EN ISO 14021 | 0%. Guidance for specification option: Grinded as solid form. |
Form | Liquid. |
Root inhibitor | Manufacturer guidanceConsult manufacturer for certification. |
Physical properties | |
Colour | Purple. Black. Anthracite. Cream. White. Other. Guidance for specification option: Other colours are available upon request; consult manufacturer for more details and insert requirements. Manufacturer guidanceOther colours are available upon request. Consult manufacturer for details. |
Weight (minimum) | 1.2–1.3 kg/L. Manufacturer guidanceDensity. |
Drying time | 4–12 hours. Guidance for specification option: 4–12 hours in normal conditions; dependant on weather. |
Air tightness | To EN 12114, 0.03 m³/m²·hour. |
Adhesion | Adhesion on mineral surfaces as concrete brick (with use of primer as bonding), to NBN EN ISO 4624, >1 N/mm², Pass. Adhesion of Passive Purple external brush on fibrecement boards (with use of primer as bonding), to NBN EN ISO 4624, >1 N/mm², Pass. Adhesion of Passive Purple external brush on insulation boards type 'Recticel', , to NBN EN ISO 4624, >1 N/mm², Pass. Adhesion of Passive Purple external brush on OSB wood (with use of primer as bonding), to NBN EN ISO 4624, Pass. |
pH | 9–10. |
Solids | >50%. |
Crack bridging | To EN1062, Pass; Class A3 (at 23°C), Class A4 (at -10°C). To EN1504-2, Pass. |
WaterImpermeability | To NBN EN 16302, Pass. |
Water vapour transmission | To ASTM E96, Pass. |
Water penetration | To ASTM E331, all substrates met ICC-ES AC212 criteria for acceptance. Manufacturer guidanceWater spray/ rain penetration. |
Freeze/ Thaw Resistance | To ASTM E2485-13, Pass. Guidance for specification option: ICC-NTA freeze/ thaw. |
Temperature resistance | -20°C to +70°C. Manufacturer guidanceAfter drying. |
Application temperature | >5°C. |
Consumption (per layer applied) | 0.75 kg/m². Manufacturer guidanceMinimum consumption. |
Sustainability data
Contains Red List materials | No |
Country of material origin | Europe |
Country of product manufacture | Europe |
Material | Polymer |
Recyclability | Not recyclable due to its adhesion to other products |
Recycled contentAs defined in clause 7.8 of BS EN ISO 14021 | 0 % Guidance for specification option: Grinded as solid form. |
BIM objects
NBS BIM Object Standard
This BIM object has been authored to meet the requirements of the NBS BIM Object Standard.
Find out more about the NBS BIM Object Standard.
| Platform | Compatible | Version |
|---|---|---|
 Revit | - | 1 |
 IFC | - | 1 |
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