Fire Collar vs Fire Sealant | What’s the Difference? (Australia Guide)
Date Posted:18 May 2026
One of the most common questions in fire stopping is whether to use a fire collar or a fire sealant. Using the wrong product can lead to non-compliance and failed inspections.
In this guide, we explain the key differences and when to use each in Australia.
What Is a Fire Collar?
A fire collar is a device fitted around plastic pipes where they pass through fire-rated walls or floors.
When exposed to heat, the intumescent material expands and crushes the pipe, sealing the opening.
What Is Fire Sealant?
Fire sealant is a flexible, intumescent material used to seal gaps, joints and small penetrations.
It expands when heated to block fire and smoke.
Key Differences
- Fire collars: used for plastic pipes
- Fire sealant: used for gaps, joints and cables
- Collars: mechanical solution
- Sealants: flexible solution
When Do You Need a Fire Collar?
- PVC or HDPE pipes
- Pipe penetrations through walls or slabs
- Where pipe melts in fire conditions
When Do You Need Fire Sealant?
- Cable penetrations
- Small service gaps
- Construction joints
Can You Use Both Together?
Yes. Many compliant fire stopping systems use both collars and sealants together.
Common Mistakes
- Using sealant instead of collars for plastic pipes
- Not sealing around collars
- Using non-tested systems
Final Thoughts
Choosing the correct product is essential for compliance with Australian standards.