OBEX CORTEX 0521FR Self-Adhesive Breather Membrane - Class B-s1,d0
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Description
Description
The OBEX CORTEX 0521FR Self-Adhesive Breather Membrane - Class B-s1,d0 is a fire-classified, self-adhesive breather membrane for external wall and facade applications, combining a self-adhesive backing with a breathable, airtight layer.
WHERE IT'S USED
Applied directly to sheathing board on external facades to prevent water ingress while allowing vapour to escape. Also available in plain black finish for use behind open rainscreen cladding.
BUILD-UP
A self-adhesive membrane conforming to EN 13859-2, with a split release liner for faster installation, available in 1500mm or 370mm widths, 25m length, black (OBEX branded) or plain black finish.
KEY BENEFITS
- Class B-s1,d0 fire classification, independent of substrate (Regulation 7 compliant)
- W1 watertightness to EN 1928
- 6 months UV resistance for flexible project scheduling
- KIWA BDA third-party approved
- 20 year warranty
- Split release liner for faster installation
SPECIFICATION DATA
Fire classification: B-s1,d0 (EN 13501-1)
Standard: EN 13859-2
Width: 1500mm or 370mm
Length: 25m
Thickness: 0.38mm
Watertightness: W1 (EN 1928)
Sd value: 0.1m (EN ISO 12572)
Tensile strength: Longitudinal 255N/50mm, Transverse 180N/50mm (EN 12311-2)
UV resistance: 6 months
Passive House rating: A
Certification: KIWA Approval
Warranty: 20 years
Delivery Charges
Delivery Charges
Multiple delivery options are available and shown at checkout, including Royal Mail and DPD services. Charges are calculated based on order size and destination. Standard and specialist delivery options are available depending on the product. Full delivery terms, lead times, and exclusions can be found on our Delivery Information page.
Return Policy
Return Policy
Standard stocked items may be returned within 14 days of purchase, subject to approval. All returns must be requested through our Return Request Form returns portal and items must be unused and in original, unopened packaging.
Opened, used, made-to-order, or specially manufactured products are non-returnable. Approved returns may be subject to a restocking fee of up to 30%.
Return shipping costs are the responsibility of the customer. Full details are available on Returns & Warranty Policy.
Disclaimer
Disclaimer
FPDL Supplies do not manufacturer the products sold on our website.
While we aim to ensure that the product information on our website is correct, manufacturers may alter their product information. The information contained in this website is for general information purposes only and while we endeavour to keep the information up to date and correct manufacturers may alter their product information. FPDL Supplies make no representations or warranties of any kind, express or implied, about the completeness, accuracy, reliability, suitability or availability with respect to the website or the information, products, services, or related graphics contained on the website for any purpose. Any reliance you place on such information is therefore strictly at your own risk.
In no event will we be liable for any loss or damage including without limitation, indirect or consequential loss or damage, or any loss or damage whatsoever arising from loss of data or profits arising out of, or in connection with, the use of this website.
Through this website you can link to other websites which are not under the control of FPDL Supplies. We have no control over the nature, content and availability of those sites. The inclusion of any links does not necessarily imply a recommendation or endorse the views expressed within them.
Every effort is made to keep the website up and running smoothly. However, FPDL Supplies takes no responsibility for, and will not be liable for, the website being temporarily unavailable due to technical issues beyond our control.
This statement does not affect your statutory rights.
The OBEX CORTEX 0521FR Self-Adhesive Breather Membrane - Class B-s1,d0 is a fire-classified, self-adhesive breather membrane for external wall and facade applications, combining a self-adhesive backing with a breathable, airtight layer.
WHERE IT'S USED
Applied directly to sheathing board on external facades to prevent water ingress while allowing vapour to escape. Also available in plain black finish for use behind open rainscreen cladding.
BUILD-UP
A self-adhesive membrane conforming to EN 13859-2, with a split release liner for faster installation, available in 1500mm or 370mm widths, 25m length, black (OBEX branded) or plain black finish.
KEY BENEFITS
- Class B-s1,d0 fire classification, independent of substrate (Regulation 7 compliant)
- W1 watertightness to EN 1928
- 6 months UV resistance for flexible project scheduling
- KIWA BDA third-party approved
- 20 year warranty
- Split release liner for faster installation
SPECIFICATION DATA
Fire classification: B-s1,d0 (EN 13501-1)
Standard: EN 13859-2
Width: 1500mm or 370mm
Length: 25m
Thickness: 0.38mm
Watertightness: W1 (EN 1928)
Sd value: 0.1m (EN ISO 12572)
Tensile strength: Longitudinal 255N/50mm, Transverse 180N/50mm (EN 12311-2)
UV resistance: 6 months
Passive House rating: A
Certification: KIWA Approval
Warranty: 20 years
Multiple delivery options are available and shown at checkout, including Royal Mail and DPD services. Charges are calculated based on order size and destination. Standard and specialist delivery options are available depending on the product. Full delivery terms, lead times, and exclusions can be found on our Delivery Information page.
Standard stocked items may be returned within 14 days of purchase, subject to approval. All returns must be requested through our Return Request Form returns portal and items must be unused and in original, unopened packaging.
Opened, used, made-to-order, or specially manufactured products are non-returnable. Approved returns may be subject to a restocking fee of up to 30%.
Return shipping costs are the responsibility of the customer. Full details are available on Returns & Warranty Policy.
FPDL Supplies do not manufacturer the products sold on our website.
While we aim to ensure that the product information on our website is correct, manufacturers may alter their product information. The information contained in this website is for general information purposes only and while we endeavour to keep the information up to date and correct manufacturers may alter their product information. FPDL Supplies make no representations or warranties of any kind, express or implied, about the completeness, accuracy, reliability, suitability or availability with respect to the website or the information, products, services, or related graphics contained on the website for any purpose. Any reliance you place on such information is therefore strictly at your own risk.
In no event will we be liable for any loss or damage including without limitation, indirect or consequential loss or damage, or any loss or damage whatsoever arising from loss of data or profits arising out of, or in connection with, the use of this website.
Through this website you can link to other websites which are not under the control of FPDL Supplies. We have no control over the nature, content and availability of those sites. The inclusion of any links does not necessarily imply a recommendation or endorse the views expressed within them.
Every effort is made to keep the website up and running smoothly. However, FPDL Supplies takes no responsibility for, and will not be liable for, the website being temporarily unavailable due to technical issues beyond our control.
This statement does not affect your statutory rights.
FPDL Supplies Product Range
FPDL Supplies is a specialist trade supplier supporting construction and compliance-led projects across the UK. Our product range covers certified fire protection, fixings and fasteners, cable management, insulation, construction materials, PPE and safety wear, professional paints and decorating products, and tools and accessories.
Every product we stock is sourced from trusted manufacturers and selected for site performance — giving contractors, installers, and facilities teams the materials they need to work safely, efficiently, and in line with UK regulations and industry standards.
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