FSi PipeBloc PWP - Prefabricated Pipe Wrap

November 11, 2026

When plastic pipes pass through fire-resistant walls and floors, appropriate firestopping is required to help maintain the compartmentation of the building.


FSI PipeBloc PWP is a specialist prefabricated pipe wrap designed to provide fire protection around suitable combustible pipe penetrations.


What is FSi PipeBloc PWP?

PipeBloc PWP is a fire-resistant prefabricated pipe wrap consisting of polyethylene sheathing and an intumescent insert.



It has been developed for interior penetration sealing applications, providing a high-volume expansion and pressure seal during a fire.


The product is designed for suitable combustible pipes passing through service openings in walls and floors.


How does PipeBloc PWP work?

The intumescent material reacts when exposed to elevated temperatures.


As the combustible pipe softens or burns away, the material expands to help close the resulting opening.


This helps reinstate the fire resistance of the surrounding construction when installed as part of the correct tested system.


What are the benefits of a prefabricated pipe wrap?

PipeBloc PWP is supplied pre-assembled, helping simplify the installation process.


Manfacturer documentation identifies several features:

  1. Prefabricated design
  2. Available in different sizes
  3. Suitable for specified combustible pipe applications
  4. Can be incorporated into compatible fire batt systems
  5. Designed to provide a high-volume expansion seal
  6. Tested to BS EN 1366-3


The product is also designed for use alongside compatible FSi products, including Stopseal Batt, Silverseal Compound and Pyrocoustic Sealant.


Choosing the correct pipe wrap

The pipe material, diameter, supporting consturction and opening dimensions all influence product selection.


Always refer to the manufacturer's current technical documentation to establish the correct configuration and performance classification.


At Blazeout, we support firestopping contractors and construction professionals with access to a wide range of passive fire protection materials.


For enquiries about FSI PipeBloc PWP, fire collars, pipe wraps and other penetration sealing products, contact our team.

November 11, 2026
Discover FSi PipeBloc EL, a flexible intumescent pipe wrap for suitable plastic and metallic pipe penetrations through fire-resistant walls and floors.
November 4, 2026
Discover FSi Stopseal Ablative Spray Coating for use with Stopseal Fire Batt systems to reinstate fire resistance around service penetrations.
November 3, 2026
Discover FSi Pyrocoustic Trowel Grade, an acrylic ablative fire-resistant sealant for specified firestopping joints and service penetrations.