Concrete coating PASSIVE PURPLE X

sealing

Overview
Passive Purple X is a fire-class B airtight coating and vapour-control membrane supplied in a brush-applied 5 kg tub. It provides a watertight yet vapour‑open membrane for internal and external building envelopes where reaction-to-fire performance is required.

Key Features

• Watertight yet vapour breathable
• Airtight
• UV resistant
• Anti-fungal properties
• Self-cleaning / reduced dirt pickup due to UV netting
• Crack‑bridging
• Carbonation barrier and realkalising action for concrete
• Protection against salt attack on concrete structures near roads
• Can be used as an anti‑carbonation protective coating on concrete
• Coverage: approx. 1 kg per m²

Tested & Certified — fire-rated, watertight & breathable
Passive Purple X has independently verified performance to relevant European and US standards:

• Reaction to fire: Euroclass B‑s1,d0 (EN 13501‑1) on suitable substrates and ASTM E84 Class A (Flame Spread 0 / Smoke 15)
• Watertight: Class W1 (EN 13859‑2) & water permeability Class W3 (EN 1062‑3)
• Breathable / vapour-open — Sd ≈ 0.6 m (EN ISO 12572)
• Crack-bridging: A3 (23°C) / A4 (-10°C) (EN 1062‑7) and CO₂ / carbonation barrier Class C1 (EN 1062‑6)
• Approvals: Kiwa BDA Agrément (BAW-21-214-P-A-UK); Passive House component (phB); US ICC-ES AC212

Why Choose Passive Purple X?

• Cost-effective coverage, especially when spray-applied with airless equipment
• Water‑based, VOC‑free formulation
• Easy application — compatible with airless spray, roller or brush (this pack: brush-applied)
• Suitable for external use — creates a durable watertight vapour-control membrane with UV resistance
• Fire-rated — provides Class B fire performance
• Maintains airtightness while allowing controlled vapour release

Uses & Directions

• Adheres to insulation panels, concrete and brick walls, fibre cement boards, engineered wood panels / OSB
• Surface preparation: remove salt efflorescence, dust, loose material and standing water; fill holes and joints as required
• Application: do not add water or solvents; do not apply in direct sunlight or in rain; avoid substrate temperatures below 5°C; humid surfaces allowed if no standing water
• Apply in two layers — allow first coat to dry before applying second
• Tools: clean with water after use

Related Guides & Resources (titles)

• Airtight and Vapour Control for High-Rise Re-Cladding
• The Airtightness Challenge: Why Blockwork Alone Is No Longer Enough
• How to Retrofit Vapour Control Without the Mess

Quality assurance
Manufacturer provides a downloadable Installation & QA record (installation QA record reference IM-QA-06) for project sign-off.

Technical specifications

• Commercial name: Passive Purple X
• Manufacturer: Intelligent Membranes
• Usage: Internal & External
• Application method: Brush (also suitable for airless spray and roller)
• Pack size: 5 kg tub (brush-applied)
• Colour: Purple
• Coverage: approx. 1 kg/m² (depends on substrate and application)
• Reaction to fire: Euroclass B‑s1,d0 (EN 13501‑1) & ASTM E84 Class A (Flame Spread 0 / Smoke 15)
• Watertight: Class W1 (EN 13859‑2); Water permeability Class W3 (EN 1062‑3)
• Vapour resistance: Sd ≈ 0.6 m (EN ISO 12572)
• Crack-bridging: A3 (23°C) / A4 (-10°C) (EN 1062‑7)
• Carbonation / CO₂ barrier: Class C1 (EN 1062‑6)
• Approvals / Certifications: Kiwa BDA Agrément (BAW-21-214-P-A-UK); Passive House component (phB); US ICC-ES AC212
• VOC: Water-based, VOC-free
• Cleaning: Tools clean with water