Buy Foam Fillers Online in Australia
Foam Filler + Sealant Selection — Quick Reference
Expanding polyurethane foam fillers SEAL GAPS + PENETRATIONS + VOIDS in building + industrial structures — providing simultaneous air sealing + moisture exclusion + thermal insulation. Foam expands after dispensing to fill irregular voids.
| Foam Filler Type | Best For |
|---|---|
| Standard Polyurethane Foam (Aerosol) | Workshop gap + crack + penetration filling |
| Gun-Grade Foam (Pro Trade) | Volume use + applicator gun + precise control |
| Low-Expansion Foam | Door + window frames — won't bow frames |
| Fire-Rated Foam | Fire-stop applications — penetration sealing |
| Acoustic Foam | Sound dampening + insulation |
| Outdoor-Grade Foam | UV + weather + exterior exposure |
| Cleaning Solvent (Acetone) | Uncured foam cleanup — only before cure |
| Foam Gun + Maintenance Cleaner | Pro applicator gun maintenance |
Critical: Polyurethane foam EXPANDS dramatically (3-5×) — fill voids partially + allow expansion. Cured foam = NOT removable with solvent — chip + cut + grind only. WEAR GLOVES + EYE PROTECTION — uncured foam sticks to skin + irreversible until cured. Brands: Selleys, Sika. Companion: adhesives + sealants, sealants, gasket sealants.
Foam Fillers & Sealants
Expanding polyurethane foam fillers seal gaps, penetrations, and voids in building and industrial structures, providing simultaneous air sealing, moisture exclusion, and thermal insulation. The foam expands after application to fill irregular spaces completely — a practical advantage over rigid filler materials that would require the gap to be accurately measured and pre-formed material cut to fit. AIMS Industrial supplies expanding foam fillers for construction, maintenance, and industrial sealing applications.
How Expanding Foam Works
One-component polyurethane foam is supplied in pressurised canisters. On dispensing, moisture in the air and substrate triggers a chemical reaction that causes the foam to expand and cure over a period of minutes to hours. The cured foam is a rigid, closed-cell structure that is an excellent air and draught seal and a reasonable thermal insulator. Foam adheres to most building materials — concrete, brick, timber, metal, and plastic — without primer. Excess foam can be trimmed with a blade once fully cured.
Types of Foam
- Standard expanding foam: General-purpose foam for sealing gaps around pipes, cables, window and door frames, and structural penetrations. Available in standard and low-expansion formulations — low-expansion foam is specified around window and door frames where excess expansion would bow or distort the frame.
- Fireproof (fire-rated) expanding foam: Intumescent or fire-retardant formulation that maintains its integrity in a fire — in some cases expanding further to block the penetration against flame, smoke, and toxic gas passage. Required for fire-rated walls and floor penetrations under Australian Building Code requirements.
- Acoustic foam: Higher density formulation that reduces airborne sound transmission through sealed penetrations — specified for wall and floor penetrations where acoustic performance is part of the design specification.
Application Tips
Moisture the substrate lightly before application to improve foam adhesion and curing. Use a foam gun applicator for controlled dispensing and to prevent waste. Shake the canister thoroughly before use. For sealing and foam product recommendations for your application, contact our team.
Fire Rating and Building Code Requirements
Standard expanding foam is not fire rated — it will burn when exposed to flame and must not be used to seal penetrations through fire-rated walls, floors, or ceiling assemblies. Under the National Construction Code (NCC/BCA), penetrations through fire-rated building elements must be sealed with materials that maintain the fire resistance level (FRL) of the assembly. Intumescent fire-rated foam or other listed fire stopping systems are the compliant solution for these penetrations. Always check the product data sheet fire rating before specifying expanding foam for any penetration that passes through a fire-rated building element.