Intumescent Fireproofing Strip for 120-Minute Joint Isolation
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing fireproofing strips are complex to produce and do not effectively meet specific fire resistance criteria, such as maintaining isolation for up to 120 minutes, particularly in building joints.
Innovation Solution
A fireproofing strip made from reticulated PU soft foam impregnated with a binder, expandable graphite, and a phosphorus-containing compound, such as ammonium polyphosphate, which expands at specific temperatures to create a carbon-containing insulating layer, enhancing fire resistance and simplifying production.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional PUR sealing strips with special impregnation are used, then fire resistance is improved, but production complexity increases
Solution Approach 1:
The patent uses reticulated foam material with a porous structure that allows impregnating agents to penetrate deeply and uniformly throughout the material. This porous structure enables efficient fireproofing impregnation while simplifying the production process through direct saturation of the foam matrix.
Solution Approach 2:
The invention combines reticulated foam material with fireproofing impregnating agents containing expandable graphite and phosphorus compounds to create a composite fireproofing strip. This composite structure integrates the mechanical properties of foam with the fire-resistant properties of the impregnating agents, achieving both fire resistance and production simplicity.
2Duration of action of stationary object
If fire resistance duration is increased to meet 120 minutes criteria, then fire protection is improved, but material complexity increases
Solution Approach 1:
The patent incorporates expandable graphite that undergoes phase transition when exposed to fire temperatures. The graphite expands dramatically, forming an insulating char layer that provides extended fire resistance. This phase transition mechanism delivers long-duration fire protection through a relatively simple material composition.
Solution Approach 2:
The impregnating agent contains phosphorus compounds that, when exposed to fire, promote charring and form protective carbon layers. The harmful heat and oxygen that would normally accelerate combustion are converted into beneficial char formation that protects the underlying material, extending fire resistance duration.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The strip provides high fire resistance, smoke-tightness, and simplified production, with improved insulation and fireproofing properties, including a high degree of smoke-tightness and simplified installation due to its low delayed resilience.
Implementation Method 1
It is known that expandable graphite has the characteristic of expanding when heated. This effect is used here for fireproofing purposes. Furthermore, due to this expansion of the expandable graphite a high pressure is generated
Implementation Method 2
the foam material support is penetrated completely by the impregnating agent
Implementation Method 3
a carbon-containing insulating substance is produced which shields the foundation structure against the heat source
Data Source
Figure 1
AI summary
Fireproofing device (1), in particular a fireproofing strip (1), with an elongate support (2), which is produced from a foam material, a non-woven fabric and/or a fibrous body and is provided with an impregnating agent. According to the invention this impregnating agent contains as components at least one liquid medium and a binder for binding solid components of the impregnating agent to the foam material and expandable graphite.