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Passive Purple External: Ultimate Class B Fire Rated Internal & External Airtight Waterproof Membrane - Spray Applied Liquid Facade Membrane

Name: Passive Purple External: Ultimate Class B Fire Rated Internal & External Airtight Waterproof Membrane - Spray Applied Liquid Facade Membrane
Brand: Intelligent Membranes
SKU: iNZys5vCZNM4Cqx5KQmhej

Verified by manufacturer 3 days ago

PASSIVE PURPLE® EXTERNAL

Intelligent Membranes

Product certifications:

Passive House Institute - Certificate
Certificate type
REACTION TO FIRE - CLASSIFICATION REPORT EUI-22-000041
Certificate type
KIWA BDA
Certificate type

Airtight, liquid-applied façade waterproof membrane. Vapour-open yet watertight, achieving 0.03 airtightness. Applied by spray, roller or brush as a high-performance vapour control layer.

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+44 (0)1223 208174 Website

Application

Product Application – Passive Purple External

Passive Purple External is applied in two coats using either an airless spray or paint roller. Once cured, it forms a flexible, watertight membrane that is vapour-open and highly durable. The product is currently undergoing Passivhaus and KIWA certification.

The membrane provides:

A waterproof, vapour-open barrier to reduce uncontrolled air infiltration
Reaction to fire classification B-s1, d0 in accordance with EN 13501-1:2018
VOC-free formulation for a safe, eco-friendly application

Directions for Use

Surface Preparation
- Remove salt efflorescence, dust, loose material, and standing water.
- Ensure application is on a closed surface; fill holes and joints with a fast-setting cement-based product or polyurethane foam if required.
Application Conditions
- Apply only when substrate and ambient temperature is above 5°C.
- Application on humid surfaces is permitted, but remove any standing water.
Application Method
- Apply Passive Purple External with an airless paint spray device or paint roller.
- Apply two coats; allow the first coat to fully dry before applying the second.
- The product is supplied ready to use — no dilution required.
Aftercare
- Clean all tools immediately with water after use.
- Once cured, the coating provides long-term, seamless protection.

Key Benefits During Application

Quick and simple installation with standard spraying or rolling equipment
No VOCs – safe to apply in sensitive environments
Seamless finish with excellent adhesion to multiple substrates

Description

Discover Passive Purple External: The Ultimate Net Zero & Passivhaus Waterproofing Solution

Introducing Passive Purple External, a revolutionary liquid-applied membrane from Intelligent Membranes. Specifically engineered to deliver superior airtightness, waterproofing, and energy efficiency, it is suitable for any construction type — from new builds to retrofits and even sensitive heritage restorations.

Why Choose Passive Purple External?

Unmatched Airtightness & Waterproofing – Creates a seamless, watertight barrier against rain, wind, and environmental exposure.
Energy Efficiency – Reduces heat loss while remaining vapour-open, preventing condensation and ensuring a healthy indoor climate.
Fire Class B Rated & UV Resistant – Certified performance that withstands harsh conditions for long-lasting protection.
Ideal for Heritage Projects – Breathable and flexible to protect and preserve historic structures.
Self-Cleaning & Anti-Fungal – Reduces dirt pickup, resists mould growth, and maintains a clean, durable finish.

Key Technical Characteristics

Raintight yet vapour-breathable
Crack-bridging capability
Carbonatation and salt protection for concrete
Smoke-tight and anti-carbonatation on cementitious surfaces
Radon and methane resistance

Applications

Passive Purple External is the go-to solution for:

New build airtightness – robust vapour control membranes for modern projects
Retrofit airtightness – eco-friendly membranes for improved fabric performance
Commercial & Domestic projects – reliable protection for walls, roofs, and floors
Heritage restoration – breathable, seamless protection without damaging original substrates

Certified Protection Against:

Air leakage & moisture ingress
Radon and methane
Condensation and mould
Weathering and UV exposure
Structural carbonation and salts

Backed by KIWA certification, Passive Purple External is the ideal choice for architects, contractors, and developers striving to meet Passivhaus and Net Zero standards.

General information

Color	Black Purple Other Cream White Grey Blue Show more Manufacturer guidance Other 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	Pr_25_57_65_60 Plastics sheetsPrimary
CAWS	H30/261 Air and vapour control membrane H31/261 Air and vapour control membrane P10/60 Air and vapour control layer H31/45 Air and vapour control membrane P10/310 Air and vapour control layer H30/30 Air and vapour control membrane

SKU Code	IM/00PPE10

Product range	Weatherproofing Façade Membrane - Retrofit internal Air Barrier Methane and Radon Barrier Vapour Control - Air barrier / External

Specification data - Plastics sheets

Classification data
Product reference	Passive Purple External: Ultimate Class B Fire Rated Internal & External Airtight Waterproof Membrane.
Material	Acrylate polymer.
Purpose	Airtight weatherproof membrane.
Standard	To BS EN 16302, BS EN ISO 12572 and BS EN ISO 4624.
Third-party certification	Kiwa, Passivhaus certified. Manufacturer guidance Manufacturer's standard. SHR, BBR.
Performance characteristics	-
Tensile strength (minimum)	38/ 35 N/50mm (after ageing).
Tear resistance	To NBN EN ISO 12311, 38/ 35 N/50mm.
Elongation to break	To NBN EN ISO 12311-1, >40%. Manufacturer guidance Elongation after ageing.
Resistant to underground gases	Methane. To BS EN 1062 CO₂ permeability Method A, Class C1.
Water vapour resistance (minimum)	3.1 MN·s/g. μ-value to EN ISO 12572, 2486. SD-value to EN ISO 12572, 0.6–1. Guidance for specification option: SD-value calculated value based on a consumption of 0.6–0.8 kg/m².
Fire performance	Resistance to fire class to EN13501, Class B-s1, d0.
UV stabilization	To BS EN ISO 16474-3, Pass (KIWA). Manufacturer guidance Consult manufacturer for certifications.
Anti-static properties	Required.
Environmental performance requirements	-
Volatile organic compounds (VOC) emissions level (maximum)	VOC free.
Recycled content As defined in clause 7.8 of BS EN ISO 14021	0%. Manufacturer guidance Grinded as dry film.
Form	Liquid.
Physical properties	-
Colour	Black. Purple. White. Cream. Grey. Blue. Other. Manufacturer guidance Other colours are available upon request. Consult manufacturer for details.
Weight (minimum)	1.2 kg/L. Manufacturer guidance Density.
Drying time	4–12 hours. Guidance for specification option: In normal conditions; weather dependant.
Air tightness	To EN12114, 0.03 m³/m²·hour. Guidance for specification option: Airtightness system with Rockwool® panels anchored on/through Passive Purple external membrane on blockwall.
Adhesion	0.16 N/mm². Adhesion on mineral surfaces (with use of primer as bonding): to NBN EN ISO 4624, Pass, 1 N/mm². Adhesion of Passive Purple External on fibre cement boards (with use of primer as bonding): to NBN EN ISO 4624, Pass, 1 N/mm². Adhesion of Passive Purple External on plywood (with use of primer as bonding): To ASTN CO297, Pass. Adhesion of Passive Purple External on insulation boards type 'recticel': to NBN EN ISO 4624, Pass.
pH	9–10.
Solids	>50%.
Crack bridging	To EN 1062-7, Pass, Class A3 (at 23°C); Pass, Class A4 (at -10°C). To EN1504-2, Pass.
WaterImpermeability	To EN 1062-3, W <0.1 kg/m²·h⁰·⁵. To NBN EN 16302, Pass, 0.004 mL/cm². Water damp permeability to EN ISO 12572, 0.75 kg/m².
Water vapour transmission	To ASTM E96, SD-value <1.0.
Temperature resistance	-20°C to + 70°C.
Application temperature	<5°C.
Consumption (per layer applied)	0.75 kg/m². Guidance for specification option: For a layer of 0.625 mm thick. Manufacturer guidance Total indicative consumption.

Sustainability data

Contains Red List materials	No
Country of material origin	Europe
Country of product manufacture	Europe
Manufacturing plant location	Belgium
Material	Polymer
Recyclability	Not recyclable due to its adhesion to other products
Recycled content As defined in clause 7.8 of BS EN ISO 14021	0 % Guidance for specification option: Grinded as dry film.
Expected Life	60 year